Girardia Sinensis

picture info	Girardia Sinensis ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of '' Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for ''Girardia dorotocephala'' and '' Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Arndti ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Chilla ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Corumbataiensis ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Capacivasa ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Canai ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Cameliae ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Bursalacertosa ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Bonaerensis ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Biapertura ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Barbarae ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Azteca ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]

picture info	Girardia Sinensis ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of '' Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for ''Girardia dorotocephala'' and '' Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Arndti ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Chilla ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Corumbataiensis ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Capacivasa ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Canai ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Cameliae ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Bursalacertosa ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Bonaerensis ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Biapertura ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Barbarae ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Girardia Azteca ''Girardia'' is a genus of freshwater planarians belonging to the family Dugesiidae. Distribution The genus ''Girardia'' is endemic to the Americas, from Argentina to Canada, although most species occur in South America. The only two species known to occur naturally in North America, ''Girardia tigrina'' and ''Girardia dorotocephala'', have been introduced in other continents and islands. Description Species of ''Girardia'' are very similar to species of other genera of Dugesiidae and few apomorphies that clearly define the genus are known. One of the few exclusive characteristics is the presence of pigment granules in the outer pharyngeal wall. Until 1991 ''Girardia'' was considered a subgenus of ''Dugesia'', then it was upgraded to the genus rank. However, some works continued to use the old genus for some ''Girardia'' species, mainly for '' Girardia dorotocephala'' and ''Girardia tigrina''. Species '' Girardia anceps'' (Kenk, 1930) '' Girardia anderlani'' (Kawakatsu & Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]