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Leptocephalus is a genus that was used for species of larval eels, called leptocephali, that were thought to be new fish species, or whose adult eel species were not known. Leptocephali differ so much in appearance from their adults that the larvae and adults of eels are not easily matched, and when first discovered, leptocephali were thought to be a distinct type of fishes, but not eels. Because of this, the genus designation of Leptocephalus was used for a while for unidentified leptocephali even after it was known that these were the larvae of eels thus becoming a "wastebasket taxon", but this practice is no longer used. Examples of marine congrid larvae, found in the western Indian Ocean and the Red Sea that were named this way are listed below. Only two species in two families are currently treated as having any validity, though the validity of L. bellottii is strongly in doubt.
Gavialiceps is a genus of eels in the pike conger family, Muraenesocidae.
Promyllantor adenensis is an eel in the family Congridae. It was described by Wolfgang Klausewitz in 1991, originally under the genus Bathycongrellus. It is a marine, deep water-dwelling eel which is known from the Indo-Western Pacific, including the Gulf of Aden and the Lord Howe Seamount Chain. It is known to dwell at a depth range of 2,227 to 2,325 metres. Males can reach a maximum total length of 51.2 centimetres (20.2 in).
Gorgasia cotroneii is an eel in the family Congridae. It was described by Umberto D'Ancona in 1928, originally under the genus Leptocephalus. It is a marine, tropical eel which is known from the Red Sea, in the western Indian Ocean.
Heteroconger congroides is an eel in the family Congridae. It was described by Umberto D'Ancona in 1928, originally under the genus Leptocephalus. It is a marine, deepwater-dwelling eel which is known from the Kamaran Islands in Yemen, in the Red Sea, in the western Indian Ocean. It is known only from larvae, which are known from a depth of 522 m (1,713 ft).
The Guinean pike conger is an eel in the family Muraenesocidae. It was described by Oronzio Gabriele Costa in 1846. It is a marine, subtropical eel which is known from the eastern Atlantic Ocean, including Gibraltar, the western Mediterranean, and Angola. It dwells at a depth range of 10 to 100 metres ; larger individuals are usually found from 75 to 100 metres. It inhabits sand and mud substrates on the continental shelf. Males can reach a maximum total length of 200 centimetres (79 in), but more commonly reach a TL of 150 centimetres (59 in).
Gavialiceps bertelseni is an eel in the family Muraenesocidae. It was described by Emma Stanislavovna Karmovskaya in 1993. It is a marine, deep water-dwelling eel which is known from the southwestern slope of Madagascar, in the western Indian Ocean. It dwells at a depth range of 670 to 1,200 metres. Males can reach a maximum total length of 84 centimetres (33 in).
The duckbill conger is an eel in the family Muraenesocidae. It was described by Emma Stanislavovna Karmovskaya in 1993. It is a marine, deep water-dwelling eel which is known from the Indo-West Pacific, including northwestern Australia, Java, and Indonesia. It dwells at a depth range of 560–600 metres. Males can reach a maximum total length of 89 centimetres.
Gavialiceps taeniola is an eel in the family Muraenesocidae. It was described by Alfred William Alcock in 1889. It is a marine, deep water-dwelling eel which is known from the Indian Ocean, including the Arabian Sea, Oman, and the Bay of Bengal. It dwells at a depth range of 350 to 1,046 metres. Males can reach a maximum total length of 64.7 centimetres (25.5 in).
Gavialiceps taiwanensis is an eel in the family Muraenesocidae. It was described by Johnson T. F. Chen and Herman Ting-Chen Weng in 1967, originally under the genus Chlopsis. It is a marine, deep water-dwelling eel which is known from the northwestern Pacific Ocean, including Taiwan and Okinawa, Japan. It dwells at a depth range of 600 to 750 metres. Males can reach a maximum total length of 75.7 centimetres (29.8 in).
Facciolella saurencheloides is an eel in the family Nettastomatidae. It was described by Umberto D'Ancona in 1928. It is a marine, deep water-dwelling eel which is known from the northwestern and western Indian Ocean, including the Red Sea. It dwells at a depth range of 700–2000 metres.
Myrophis lepturus is an eel in the family Ophichthidae. It was described by Adolf Kotthaus in 1968. It is a marine, tropical eel which is known from the Gulf of Aden in the western Indian Ocean. It is known to dwell at a depth of 60 metres (200 ft).
The Longtailed sand-eel is an eel in the family Ophichthidae. It was described by Albert Günther in 1870, originally under the genus Ophichthys. It is a marine, tropical eel, which is known from Aden to Natal, South Africa, in the western Indian Ocean. Males can reach a maximum total length of 54 centimetres (21 in).
Ophichthus echeloides is an eel in the family Ophichthidae. It was described by Umberto D'Ancona in 1928. It is a marine, tropical eel which is known from the Gulf of Aqaba and the Red Sea, in the western Indian Ocean. Males can reach a maximum total length of 51 centimetres (20 in).
Ophichthus ishiyamorum is an eel in the family Ophichthidae. It was described by John E. McCosker in 2010. It is a marine, deep water-dwelling eel which is known from the Gulf of Aden and Somalia. It dwells at a depth range of 258 to 400 metres. Males can reach a maximum total length of 43.7 centimetres (17.2 in).
The Marble-toothed snake-eel is an eel in the family Ophichthidae. It was described by Charles Henry Gilbert in 1898. It is a marine, tropical eel which is known from the eastern central and southeastern Pacific Ocean, including Costa Rica, Colombia, Panama and Ecuador. It dwells in shallow waters at a maximum depth of 10 metres (33 ft), and inhabits sand and mud sediments and mangroves. Males can reach a maximum total length of 68 centimetres (27 in).
The Speckled snake eel is an eel in the family Ophichthidae. It was described by John Roxborough Norman in 1939, originally under the genus Ophichthus. It is a marine, tropical eel which is known from the western Indian Ocean, including the Gulf of Aden and Somalia. It dwells at a depth range of 11 to 322 metres. Males can reach a maximum total length of 62.5 centimetres (24.6 in), while females can reach a maximum TL of 75.2 centimetres (29.6 in).
The strict snake eel is an eel in the family Ophichthidae. It was described by David Starr Jordan and John Otterbein Snyder in 1901. It is a marine, temperate water-dwelling eel which is known from the Indo-Pacific, including Japan, the Philippines, the China Sea, and South Africa. It dwells at a depth range of 146 to 209 meters. Males can reach a maximum total length of 93 centimeters (37 in).
Dysomma brevirostre, the pignosed arrowtooth eel or Batnose eel,) is an eel in the family Synaphobranchidae. It was described by Luigi Facciolà in 1887. It is a marine, deep water-dwelling eel which is known from the eastern and western Atlantic Ocean, including Madeira Island, the Gulf of Guinea, the Ligurian Sea, Italy, and Florida and Hawaii, USA. It dwells at a depth range of 200 to 1,000 metres, and inhabits soft sediments on the continental slope. Males can reach a maximum total length of 30 centimetres (0.98 ft).
The Kaup's arrowtooth eel is an eel in the family Synaphobranchidae. It was described by James Yate Johnson in 1862. It is a marine, deep water-dwelling eel which is known from the Indo-Western Pacific and eastern and western Atlantic Ocean, including the Faroe Islands, Iceland, Cape Verde, the Western Sahara, Nigeria, Namibia, South Africa, Greenland, France, Saint Pierre and Miquelon, the United Kingdom, Ireland, the Philippines, Portugal, Spain, the Bahamas, Brazil, Canada, Cuba, Japan, Australia, Mauritania, Morocco, and Hawaii. It dwells at a depth range of 120 to 4,800 metres, most often between 400 to 2,200 metres, and inhabits the upper abyssal zone on the continental slope. It is intolerant of the temperatures of higher waters. Males can reach a maximum total length of 100 centimetres (39 in).
References
- ↑ Synonyms of Gavialiceps arabicus at www.fishbase.org.
- 1 2 Gavialiceps arabicus at www.fishbase.org.
- ↑ D'Ancona, U. 1928 [ref. 15917] Murenoidi (Apodes) del Mar Rosso e del Golfo di Aden. Materiali raccolti dal Prof. Luigi Sanzo nella Campagna della R. N. "Ammiraglio Magnaghi" 1923-24. Memoria, Comitato Talassografico Italiano No. 146: 1-146, Pls. 1-5.
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