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Ibla (crustacean)
''Ibla'' is a genus of barnacle. In 1848, Charles Darwin studied the genus and found species with hermaphrodites and tiny males. In this genus the number androdioecious species is uncertain because some authors use the words female and hermaphrodite interchangeably. Species Species in this genus include: *'' Ibla cumingi'' *''Ibla quadrivalvis ''Ibla quadrivalvis'' is a species of barnacle in the Iblidae family. The common name for this species is hairy stalked barnacle. The species was studied by Charles Darwin. He first described that this specie is androdioecious Androdioecy is a ...'' *'' Ibla atlantica'' *'' Ibla sibogae'' *'' Ibla pygmaea'' *'' Ibla idiotica'' *'' Ibla cuvieriana'' References *Leach, M.D. (1825). XXIII. A tabular view of the Genera composing the Class Cirripedes, with Descriptions of the Species of Otion, Cineras, and Clyptra. ''The Zoological journal.'' 2: 208-215. page(s): 209 cited in WoRMS http://www.marinespecies.org/aphia.php?p=taxdetails&i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barnacle
A barnacle is a type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosive settings. They are sessile (nonmobile) and most are suspension feeders, but those in infraclass Rhizocephala are highly specialized parasites on crustaceans. They have four nektonic (active swimming) larval stages. Around 1,000 barnacle species are currently known. The name is Latin, meaning "curl-footed". The study of barnacles is called cirripedology. Description Barnacles are encrusters, attaching themselves temporarily to a hard substrate or a symbiont such as a whale ( whale barnacles), a sea snake ('' Platylepas ophiophila''), or another crustacean, like a crab or a lobster (Rhizocephala). The most common among them, "acorn barnacles" ( Sessilia), are sessile where they grow their shells directly onto the substrate. Peduncul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Darwin
Charles Robert Darwin ( ; 12 February 1809 – 19 April 1882) was an English naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology. His proposition that all species of life have descended from a common ancestor is now generally accepted and considered a fundamental concept in science. In a joint publication with Alfred Russel Wallace, he introduced his scientific theory that this branching pattern of evolution resulted from a process he called natural selection, in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding. Darwin has been described as one of the most influential figures in human history and was honoured by burial in Westminster Abbey. Darwin's early interest in nature led him to neglect his medical education at the University of Edinburgh; instead, he helped to investigate marine invertebrates. His studies at the University of Cambridge's Christ's Col ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Androdioecious
Androdioecy is a reproductive system characterized by the coexistence of males and hermaphrodites. Androdioecy is rare in comparison with the other major reproductive systems: dioecy, gynodioecy and hermaphroditism. In animals, androdioecy has been considered a stepping stone in the transition from dioecy to hermaphroditism, and vice versa. Androdioecy is sometimes referred to as a mixed breeding system with trioecy and gynodioecy. It is a dimorphic sexual system in plants alongside gynodioecy and dioecy. Evolution of androdioecy The fitness requirements for androdioecy to arise and sustain itself are theoretically so improbable that it was long considered that such systems do not exist. Particularly, males and hermaphrodites have to have the same fitness, in other words the same number of offspring, in order to be maintained. However, males only have offspring by fertilizing eggs or ovules of hermaphrodites, while hermaphrodites have offspring both through fertilizing eggs or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Female
Female (Venus symbol, symbol: ♀) is the sex of an organism that produces the large non-motile ovum, ova (egg cells), the type of gamete (sex cell) that fuses with the Sperm, male gamete during sexual reproduction. A female has larger gametes than a male. Females and males are results of the anisogamous reproduction system, wherein gametes are of different sizes, unlike isogamy where they are the same size. The exact mechanism of female gamete evolution remains unknown. In species that have males and females, Sex-determination system, sex-determination may be based on either sex chromosomes, or environmental conditions. Most female mammals, including female humans, have two X chromosomes. Female characteristics vary between different species with some species having pronounced Secondary sex characteristic, secondary female sex characteristics, such as the presence of pronounced mammary glands in mammals. In humans, the word ''female'' can also be used to refer to gender i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermaphrodite
In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many Taxonomy (biology), taxonomic groups of animals (mostly invertebrates) do not have separate sexes. In these groups, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. For example, the great majority of tunicata, tunicates, pulmonate molluscs, opisthobranch, earthworms, and slugs are hermaphrodites. Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. Most plants are also hermaphrodites. Animal species having different sexes, male and female, are called Gonochorism, gonochoric, which is the opposite of hermaphrodite. There are also species where hermaphrodites exist alongside males (called androdioecy) or alongside females (called gynodioecy), or all three exist in the same species ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Cumingi
Ragusa (; scn, Rausa ; la, Ragusia) is a city and ''comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,288 inhabitants in 2016. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo and Cava Santa Domenica. Together with seven other cities in the Val di Noto, it is part of a UNESCO World Heritage Site. History The origins of Ragusa can be traced back to the 2nd millennium BC, when there were several Sicel settlements in the area. The current district of Ragusa Ibla has been identified as Hybla Heraea. The ancient city, located on a hill, came into contact with nearby Greek colonies, and grew thanks to the nearby port of Camerina. After a short period of Carthaginian rule, it fell into the hands of the ancient Romans and the Byzantines, who fortified the city and built a large castle. Ragusa was occupied by the Arabs in 848 AD and remained under their rule until the 11th century, when t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Quadrivalvis
''Ibla quadrivalvis'' is a species of barnacle in the Iblidae family. The common name for this species is hairy stalked barnacle. The species was studied by Charles Darwin. He first described that this specie is androdioecious Androdioecy is a reproductive system characterized by the coexistence of males and hermaphrodites. Androdioecy is rare in comparison with the other major reproductive systems: dioecy, gynodioecy and hermaphroditism. In animals, androdioecy has bee .... They live under rocks, in damp cracks and among colonies of tube worms. They are the only stalked barnacle living permanently on rocky shores of south-eastern Australia. References {{Taxonbar, from=Q63711309 Barnacles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Atlantica
Ragusa (; scn, Rausa ; la, Ragusia) is a city and ''comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,288 inhabitants in 2016. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo and Cava Santa Domenica. Together with seven other cities in the Val di Noto, it is part of a UNESCO World Heritage Site. History The origins of Ragusa can be traced back to the 2nd millennium BC, when there were several Sicel settlements in the area. The current district of Ragusa Ibla has been identified as Hybla Heraea. The ancient city, located on a hill, came into contact with nearby Greek colonies, and grew thanks to the nearby port of Camerina. After a short period of Carthaginian rule, it fell into the hands of the ancient Romans and the Byzantines, who fortified the city and built a large castle. Ragusa was occupied by the Arabs in 848 AD and remained under their rule until the 11th century, when t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Sibogae
Ragusa (; scn, Rausa ; la, Ragusia) is a city and '' comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,288 inhabitants in 2016. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo and Cava Santa Domenica. Together with seven other cities in the Val di Noto, it is part of a UNESCO World Heritage Site. History The origins of Ragusa can be traced back to the 2nd millennium BC, when there were several Sicel settlements in the area. The current district of Ragusa Ibla has been identified as Hybla Heraea. The ancient city, located on a hill, came into contact with nearby Greek colonies, and grew thanks to the nearby port of Camerina. After a short period of Carthaginian rule, it fell into the hands of the ancient Romans and the Byzantines, who fortified the city and built a large castle. Ragusa was occupied by the Arabs in 848 AD and remained under their rule until the 11th century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Pygmaea
Ragusa (; scn, Rausa ; la, Ragusia) is a city and ''comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,288 inhabitants in 2016. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo and Cava Santa Domenica. Together with seven other cities in the Val di Noto, it is part of a UNESCO World Heritage Site. History The origins of Ragusa can be traced back to the 2nd millennium BC, when there were several Sicel settlements in the area. The current district of Ragusa Ibla has been identified as Hybla Heraea. The ancient city, located on a hill, came into contact with nearby Greek colonies, and grew thanks to the nearby port of Camerina. After a short period of Carthaginian rule, it fell into the hands of the ancient Romans and the Byzantines, who fortified the city and built a large castle. Ragusa was occupied by the Arabs in 848 AD and remained under their rule until the 11th century, when t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Idiotica
Ragusa (; scn, Rausa ; la, Ragusia) is a city and ''comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,288 inhabitants in 2016. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo and Cava Santa Domenica. Together with seven other cities in the Val di Noto, it is part of a UNESCO World Heritage Site. History The origins of Ragusa can be traced back to the 2nd millennium BC, when there were several Sicel settlements in the area. The current district of Ragusa Ibla has been identified as Hybla Heraea. The ancient city, located on a hill, came into contact with nearby Greek colonies, and grew thanks to the nearby port of Camerina. After a short period of Carthaginian rule, it fell into the hands of the ancient Romans and the Byzantines, who fortified the city and built a large castle. Ragusa was occupied by the Arabs in 848 AD and remained under their rule until the 11th century, when t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibla Cuvieriana
Ragusa (; scn, Rausa ; la, Ragusia) is a city and '' comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,288 inhabitants in 2016. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo and Cava Santa Domenica. Together with seven other cities in the Val di Noto, it is part of a UNESCO World Heritage Site. History The origins of Ragusa can be traced back to the 2nd millennium BC, when there were several Sicel settlements in the area. The current district of Ragusa Ibla has been identified as Hybla Heraea. The ancient city, located on a hill, came into contact with nearby Greek colonies, and grew thanks to the nearby port of Camerina. After a short period of Carthaginian rule, it fell into the hands of the ancient Romans and the Byzantines, who fortified the city and built a large castle. Ragusa was occupied by the Arabs in 848 AD and remained under their rule until the 11th century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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