| Uroteuthis singhalensis | |
|---|---|
 | |
| Preserved specimen of U. singhalensis | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Order: | Myopsida |
| Family: | Loliginidae |
| Genus: | Uroteuthis |
| Species: | U. singhalensis |
| Binomial name | |
| Uroteuthis singhalensis (Ortmann, 1891) | |
| Synonyms [2] | |
| |
Uroteuthis singhalensis, commonly known as the long barrel squid, is a species of squid from the genus Uroteuthis. [3] [4] The species can be found in the Indo-West Pacific Ocean. [5]
This species was first described as Loligo singhalensis by Arnold Edward Ortmann in 1891, with the description published in volume five of Zoologische Jahrbücher. [2]
The World Register of Marine Species regards Uroteuthis singhalensis as a member of the Uroteuthis subgenus Photololigo. [2]
Uroteuthis singhalensis is a species of squid characterized by its long, slender body shape. The mantle (main body) is cylindrical, tapering to a sharp point at the rear, and is about 4–7 times as long as it is wide in mature individuals. The fins are relatively narrow and rhombic (diamond-shaped) in outline, extending for about half the length of the mantle in adults, though shorter in young specimens. The front edge of the fins curves slightly outward, while the rear edge curves slightly inward. The head is comparatively small and short, with medium-sized eyes. [6]
The arms are slender and fairly short compared to the body. The suckers on the arms have 6–11 (most commonly 9) flat, squared-off teeth along their outer edges. In male squids, the left ventral arm is modified into a reproductive organ called a hectocotylus, affecting 40–45% of the arm's length in mature males. The modified portion has fleshy, cone-shaped papillae instead of normal suckers. The tentacles are short and slender, with relatively short clubs (the expanded end sections used for catching prey). The suckers on the clubs have 15–20 sharp, conical teeth around their edges. [6]
Two small light-producing organs called photophores are present on the ink sac. The gladius, an internal shell-like structure that provides support, is very narrow with almost straight sides and is widest at its front third. This species can be distinguished from similar squids by its narrow body shape, fin proportions, arm sucker dentition, and details of the hectocotylus in males. However, proper identification often requires examination by squid experts due to the subtle differences between some closely related species. [6]
Uroteuthis singhalensis is an Indo-Pacific species with a wide distribution across tropical and subtropical waters. In the western Pacific, it can be found from the South China Sea, including waters around Singapore and Indonesia, northward to Taiwan. Its range extends westward into the Indian Ocean, where it has been recorded in the Andaman Sea off Thailand, throughout the Bay of Bengal, and along the coasts of India and Sri Lanka. [6]
The species' distribution continues further west into the Arabian Sea and along the eastern African coast. It has been reported from Somalia southward to Mozambique, including the waters around the Seychelles and the Mascarene underwater ridge. [6]
Uroteuthis singhalensis is primarily a neritic species, meaning it inhabits coastal waters over the continental shelf. While it is most commonly found in inshore areas, it has been reported at depths of up to 220 meters. [6]
This species is used for commercial fisheries, [5] including in the Philippines [7] and Sri Lanka. [8] The species has a number of commercial names. [9]
Doryteuthis plei, also known as the slender inshore squid or arrow squid, is a medium-sized squid belonging to the family Loliginidae. It occurs abundantly in coastal waters of the Atlantic Ocean, from Argentina northward to North Carolina.
Myopsida is one of the four orders of squid. It consists of two families: the monotypic Australiteuthis and the diverse and commercially important Loliginidae. Some taxonomists classify this taxon as a suborder of the order Teuthida, in which case it is known as Myopsina. This reclassification is due to Myopsina and Oegopsina not being demonstrated to form a clade.
The European squid or common squid is a large squid belonging to the family Loliginidae. It occurs abundantly in coastal waters from the North Sea to at least the west coast of Africa. This species lives from sea level to depths of 500 m (1,600 ft). Its mantle is up to 40 cm (16 in) long. The species is extensively exploited by commercial fisheries.
Sepioteuthis lessoniana, commonly known as the bigfin reef squid, tiger squid, glitter squid, oval squid, or northern calamari, is a species of loliginid squid. It is one of the three currently recognized species belonging to the genus Sepioteuthis. Studies in 1993, however, have indicated that bigfin reef squids may comprise a cryptic species complex. The species is likely to include several very similar and closely related species.
Illex coindetii, commonly known as the southern shortfin squid or broadtail shortfin squid, is a species of neritic squids in the family Ommastrephidae. They are found in the Mediterranean Sea and on both sides of the north Atlantic Ocean.
Uroteuthis duvaucelii, also known as the Indian Ocean squid or Indian squid, is an Indo-West Pacific species of squid with a wide range throughout the Indian Ocean to Malaysia and the South China Sea, and is also present in the Red Sea and the Arabian Sea. U. duvaucelii is found at depths between 3–170 m (9.8–557.7 ft) and feeds on fishes, crustaceans and other squids. Individuals have mantles moderately long and slender with broad fins, approximately 50% of the mantle length.
Uroteuthis is a genus of 14 species of common inshore squids of the Indo-West Pacific and is further subdivided into 3 subgenera. The members of the genus Uroteuthis are the only squids of the family Loliginidae that possess photophores and all species in the genus have a pair of photophore organs on the ventral surface of their ink sac either side of their intestine.
Sepia elegans, the elegant cuttlefish, is a species of cuttlefish in the family Sepiidae from the eastern Atlantic Ocean and the Mediterranean Sea. It is an important species for fisheries in some parts of the Mediterranean where its population may have suffered from overfishing.
Afrololigo mercatoris, commonly known as the Guinean thumbstall squid, is a small species of squid in the family Loliginidae from the eastern central Atlantic Ocean. It is the only species in the monotypic genus Afrololigo.
Alloteuthis media, the midsize squid or little squid, is a species of squid in the family Loliginidae from the eastern Atlantic and the Mediterranean Sea. It is generally a by-catch species in trawl fisheries, although there is an active fishery in the western Mediterranean.
Doryteuthis is a genus of squid from the waters of the western Atlantic and eastern Pacific, off the coast of the Americas. The various species are the common inshore squids of American waters. Some species are important quarry species for fisheries.
Loliolus is a genus of squid from the family Loliginidae from the Indo-Pacific region. The genus is divided into two subgenera Loliolus and Nipponololigo. They are small squids of less than 150 mm (5.9 in) in mantle length which have an expanded tentacular club. This club has 4 series of suckers. The sucker rings have plate-like teeth which are square in shape all around them. The males' hectocotylus has a ventral crest which is created by the fusion of the protective membrane with the ventral series of papillae and this crest completely obscures the conical shape of the papillae. The mantle is rounded posteriorly and lacks the posterior tail-like lobe while the fins are positioned on the rear of the mantle and extend to the posterior tip of the mantle. Their eggs are small and the males' spermatophore has a short cement body. They do not possess photophores. The two subgenera are distinguished by the hectocotylus which in Loliolus encompasses the entire arm and there are no unmodified suckers while in Nipponololigo the arm is only partly hectocotylsed and has normal suckers at its base.
Slosarczykovia is a monotypic genus of squid, its sole representative being Slosarczykovia circumantarctica. Slosarczykovia is placed in the family Brachioteuthidae.
Gonatopsis borealis, the Boreopacific armhook squid, is a species of squid from the North Pacific Ocean. It is a member of the family Gonatidae. It is an abundant species which is currently caught mainly as a bycatch by fishing boats targeting other quarry. It is an important prey species for many commercially important species of fish, as well as for marine mammals.
Ornithoteuthis volatilis, the shiny bird squid, is a squid from the subfamily Ommastrephinae, the flying squids, of the family Ommastrephidae part of the pelagic squid order Oegopsida. It is a tropical and sub-tropical species which is widely distributed in the Indo-Pacific oceans. It is slightly larger than the closely related species Ornithoteuthis antillarum of the Atlantic Ocean.
The Antarctic flying squid is a species of squid from the subfamily Todarodinae of the family Ommastrephidae, a family of pelagic squid from the order Oegopsida. It has a circumglobal distribution in the seas around the lower latitudes of the Southern Ocean.
The little flying squid is a species of squid, one of the arrow squids of the genus Todarodes, in the subfamily Todarodinae of the flying squid family Ommastrephidae. It is a small species from the waters around northern Australia and Indonesia.
The European flying squid is a species of squid from the continental slope and oceanic waters of the eastern Atlantic Ocean and the Mediterranean Sea. It is the type species of the genus Todarodes, the type genus of the subfamily Todarodinae of the pelagic squid family Ommastrephidae. It is a species which is targeted by some fisheries, although it is more often a bycatch.
Doryteuthis gahi, also known as Loligo, the Patagonian longfin squid and Patagonian squid, is a small-sized squid belonging to the family Loliginidae. It occurs in coastal waters in the southeastern Pacific Ocean and the southwestern Atlantic Ocean where it is caught and eaten for food.
Uroteuthis chinensis, also known as the Hanchi (Korean:한치),Taiwanese squid or mitre squid, is a species of squid in the west Pacific Ocean, including the China Sea.
