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Gonatidae
The Gonatidae, also known as armhook squid, are a family of moderately sized squid. The family contains about 19 species in three genera, widely distributed and plentiful in cold boreal waters of the Pacific Ocean. At least one species is known from Antarctic waters, and two from the North Atlantic. The genus ''Eogonatus'' was created for the species known as ''Eogonatus tinro'' because it did not have hooks on the tentacular club and it has 5 rows of teeth on the radula. Molecular studies in allozymes and mitochondrial DNA have indicated that this species nests within the genus ''Gonatus'', although other authorities treat it as a synonym of ''Gonatopsis okutanii''. Description Morphologically, armhook squid are fairly uniform: all species are characterised by the suckers of their arms, which are arranged in four rows (series) rather than the typical count of two. In most species, the arm's two mesial rows of suckers have been modified into hooks and the tentacular clubs&mdas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berryteuthis Magister
''Berryteuthis magister'', also known as the magister armhook squid, commander squid or schoolmaster gonate squid, is a medium-sized squid in the family Gonatidae. It is found in cold, high latitude waters of the North Pacific where it is among the most numerous squid species recorded. There are three recognised subspecies of ''B. magister''. The type locality of all three is Japan, although specimens have been recorded as far east as the Aleutian Islands. Description The cylindrical bodies of magister armhook squid are muscular with very soft reddish brown skin. Like all gonatids, the suckers of their arms are arranged in four rows or ''series''. But unlike other gonatids it is in females only that the suckers are modified into hooks; these hooks are on the mesial rows of the dorsal arms only. The clubs at the end of both tentacles are covered in 20 rows of suckers; these are smaller in ''B. magister nipponensis''. The wing-like fins at the rear of the body are rather large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eogonatus
''Gonatopsis'' is a genus of squid from the family Gonatidae. They are characterised by the loss of their tentacles by the time they have reach the subadult stage. They have arms which have two series of hooks along the midline of the oral surface arms, the radula has five or seven teeth, the mantle can be muscular or flabby, fins are rhomboid or arrow shaped and they lack photophores. They are found in the North Pacific. Species The following species have been classified as belonging to ''Gonatopsis'': *'' Gonatopsis borealis'' Sasaki, 1923 *'' Gonatopsis japonicus'' Okiyama, 1969 *'' Gonatopsis makko'' Okutani & Nemoto, 1964 *'' Gonatopsis octopedatus'' Sasaki, 1920 *'' Gonatopsis okutanii'' * Nesis, 1972 The species listed above with an asterisk (*) is a ''taxon inquirendum In biological classification, a ''species inquirenda'' is a species of doubtful identity requiring further investigation. The use of the term in English-language biological literature dates back to at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magister Armhook Squid
''Berryteuthis magister'', also known as the magister armhook squid, commander squid or schoolmaster gonate squid, is a medium-sized squid in the family Gonatidae. It is found in cold, high latitude waters of the North Pacific where it is among the most numerous squid species recorded. There are three recognised subspecies of ''B. magister''. The type locality of all three is Japan, although specimens have been recorded as far east as the Aleutian Islands. Description The cylindrical bodies of magister armhook squid are muscular with very soft reddish brown skin. Like all gonatids, the suckers of their arms are arranged in four rows or ''series''. But unlike other gonatids it is in females only that the suckers are modified into hooks; these hooks are on the mesial rows of the dorsal arms only. The clubs at the end of both tentacles are covered in 20 rows of suckers; these are smaller in ''B. magister nipponensis''. The wing-like fins at the rear of the body are rather la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopod Arm
All cephalopods possess flexible limbs extending from their heads and surrounding their cephalopod beak, beaks. These appendages, which function as muscular hydrostats, have been variously termed arms, legs or tentacles. Description In the scientific literature, a cephalopod ''arm'' is often treated as distinct from a ''Tentacle#Tentacles in invertebrates, tentacle'', though the terms are sometimes used interchangeably, often with the latter acting as an umbrella term for cephalopod limbs. Generally, arms have suckers along most of their length, as opposed to tentacles, which have suckers only near their ends.Young, R.E., M. Vecchione & K.M. Mangold 1999Cephalopoda Glossary Tree of Life web project. Barring a few exceptions, octopuses have eight arms and no tentacles, while squid and cuttlefish have eight arms (or two "legs" and six "arms") and two tentacles.Norman, M. 2000. ''Cephalopods: A World Guide''. ConchBooks, Hackenheim. p. 15. "There is some confusion around the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berryteuthis Magister3
''Berryteuthis'' is a genus of squid in the family Gonatidae, comprising two known species. The two members differ greatly in size, with '' B. anonychus'' and '' B. magister'' reaching mature mantle lengths of 10 cm and 40 cm respectively. In both members, photophores are absent. Species *''Berryteuthis anonychus'' ( Pearcy & Voss, 1963), minimal armhook squid *''Berryteuthis magister ''Berryteuthis magister'', also known as the magister armhook squid, commander squid or schoolmaster gonate squid, is a medium-sized squid in the family Gonatidae. It is found in cold, high latitude waters of the North Pacific where it is among ...'' ( Berry, 1913) **'' Berryteuthis magister magister'', magister armhook squid **'' Berryteuthis magister nipponensis'' **'' Berryteuthis magister shevtsovi'' References External linksTree of Life web project: ''Berryteuthis'' Squid Taxa named by Adolf Naef Cephalopod genera {{squid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonatopsis Okutanii
''Gonatopsis okutanii'' is a species of squid from the family Gonatidae from the northern Pacific Ocean. It is of uncertain taxonomic status, the presence of remnant tentacles on spent females indicate that this species does not belong in the genus '' Gonatopsis'' and the differences between this species and '' Gonatus makodai'' have led to some authorities stating that ''G. okutanii'' is a junior synonym of ''Eogonatus tinro''. However the World Register of Marine Species still recognises ''Gonatopsis okutanii'' as the valid name for this taxon. Description ''Gonatopsis okutanii'' is a medium-sized species of squid with a gelatinous body, 5 teeth on the radula and long, thin arms. Arms II & III are very long and slender; and their length is at least equal to the mantle length. The arms have thick bases but become weak and narrow towards their tips. Arms I-III have 2 rows of hooks in the middle and 2 rows of small suckers while arm IV only has suckers. All the arms have 5-10 pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eogonatus Tinro
''Gonatopsis okutanii'' is a species of squid from the family Gonatidae from the northern Pacific Ocean. It is of uncertain taxonomic status, the presence of remnant tentacles on spent females indicate that this species does not belong in the genus '' Gonatopsis'' and the differences between this species and '' Gonatus makodai'' have led to some authorities stating that ''G. okutanii'' is a junior synonym of ''Eogonatus tinro''. However the World Register of Marine Species still recognises ''Gonatopsis okutanii'' as the valid name for this taxon. Description ''Gonatopsis okutanii'' is a medium-sized species of squid with a gelatinous body, 5 teeth on the radula and long, thin arms. Arms II & III are very long and slender; and their length is at least equal to the mantle length. The arms have thick bases but become weak and narrow towards their tips. Arms I-III have 2 rows of hooks in the middle and 2 rows of small suckers while arm IV only has suckers. All the arms have 5-10 pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tentacular Club
All cephalopods possess flexible limbs extending from their heads and surrounding their beaks. These appendages, which function as muscular hydrostats, have been variously termed arms, legs or tentacles. Description In the scientific literature, a cephalopod ''arm'' is often treated as distinct from a ''tentacle'', though the terms are sometimes used interchangeably, often with the latter acting as an umbrella term for cephalopod limbs. Generally, arms have suckers along most of their length, as opposed to tentacles, which have suckers only near their ends.Young, R.E., M. Vecchione & K.M. Mangold 1999Cephalopoda Glossary Tree of Life web project. Barring a few exceptions, octopuses have eight arms and no tentacles, while squid and cuttlefish have eight arms (or two "legs" and six "arms") and two tentacles.Norman, M. 2000. ''Cephalopods: A World Guide''. ConchBooks, Hackenheim. p. 15. "There is some confusion around the terms ''arms'' versus ''tentacles''. The numerous lim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squid
True squid are molluscs with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not strictly fitting these criteria. Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius (cephalopod), gladius or pen, made of chitin. Squid diverged from other cephalopods during the Jurassic and occupy a similar role to teleost fish as open water predators of similar size and behaviour. They play an important role in the open water food web. The two long tentacles are used to grab prey and the eight arms to hold and control it. The beak then cuts the food into suitable size chunks for swallowing. Squid are rapid swimmers, moving by Aquatic locomotion#Jet propulsion, jet propulsion, and largely locate their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonatus
''Gonatus'' is a genus of squid in the family Gonatidae The Gonatidae, also known as armhook squid, are a family of moderately sized squid. The family contains about 19 species in three genera, widely distributed and plentiful in cold boreal waters of the Pacific Ocean. At least one species is known f ..., comprising twelve species, and therefore containing the most species in the family. Adult squid belonging to species in this genus are notable for their lack of tentacles. The genus contains bioluminescent species. Species References Squid Bioluminescent molluscs Taxa named by John Edward Gray {{squid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berryteuthis
''Berryteuthis'' is a genus of squid in the family Gonatidae, comprising two known species. The two members differ greatly in size, with '' B. anonychus'' and '' B. magister'' reaching mature mantle lengths of 10 cm and 40 cm respectively. In both members, photophores are absent. Species *''Berryteuthis anonychus'' ( Pearcy & Voss, 1963), minimal armhook squid *''Berryteuthis magister'' (Berry A berry is a small, pulpy, and often edible fruit. Typically, berries are juicy, rounded, brightly colored, sweet, sour or tart, and do not have a stone or pit, although many pips or seeds may be present. Common examples are strawberries, raspb ..., 1913) **'' Berryteuthis magister magister'', magister armhook squid **'' Berryteuthis magister nipponensis'' **'' Berryteuthis magister shevtsovi'' References External linksTree of Life web project: ''Berryteuthis'' Squid Taxa named by Adolf Naef Cephalopod genera {{squid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonatopsis
''Gonatopsis'' is a genus of squid from the family Gonatidae. They are characterised by the loss of their tentacles by the time they have reach the subadult stage. They have arms which have two series of hooks along the midline of the oral surface arms, the radula has five or seven teeth, the mantle can be muscular or flabby, fins are rhomboid or arrow shaped and they lack photophores. They are found in the North Pacific. Species The following species have been classified as belonging to ''Gonatopsis'': *''Gonatopsis borealis'' Sasaki, 1923 *''Gonatopsis japonicus'' Okiyama, 1969 *''Gonatopsis makko'' Okutani & Nemoto, 1964 *''Gonatopsis octopedatus'' Sasaki, 1920 *''Gonatopsis okutanii'' * Nesis, 1972 The species listed above with an asterisk (*) is a ''taxon inquirendum In biological classification, a ''species inquirenda'' is a species of doubtful identity requiring further investigation. The use of the term in English-language biological literature dates back to at least t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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