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• W2299538280 abstract "Larvae of Neenchelys Bamber are rather short and deep bodied, reaching about 75 mm before metamorphosis. They have a relatively short gut which is pigmented and slightly swollen at intervals along its length, as in larvae of other myrophine ophichthids. Neenchelys leptocephali also have a con­ spicuous midlateral patch of pigment about midway between the anus and caudal tip, and develop ova before metamorphosis. THE DANISH Dana Oceanographical Ex­ pedition Round the World (1928-30) col­ lected huge numbers and many different species of eel larvae (leptocephali) in the Indo-Pacific. Included among these was one larval type of quite distinctive pigmentation, consisting principally of an obvious patch of deep and surface melanophores on the lateral musculature about halfway along the body (Figure lA, lD). This pigment patch is so conspicuous and so specific in shape and position that these leptocephali cannot be confused with any other eel larvae. There were some 150 specimens of this larval type in the Dana collection, mainly from the central West Pacific, but also from as far west as the southern tip of Africa. Other collections yielded further specimens. The size range was 26-85 mm with most about 50 mm total length (TL). Some were metamorphic, but as the distinctive pigment patch disappears before metamorphosis is complete, an immediate identification was not possible without reference to other characters. pointed head which is flexed downward in most specimens, although this may possibly be an artifact of preservation. The gut is relatively short, occupying the anterior third of the body, and is pigmented more or less regularly with groups of melanophores along its length. There are about four slight swell­ ings along the length of the gut. In these characters, the larvae more closely resemble those of Myrophis (Ophichthidae, Myrophi­ nae) as illustrated by Castle (1965) and Blache (1977) than any other leptocephali. However, the characters of greatest signifi­ cance in the identification of these larvae are the presence and location of accessory bran­ chiostegal rays (jugostegalia of Parr 1930), which can be seen through the body wall of the branchial region in metamorphic and other specimens (Figure lB, IF), and the possession ofa well-developed caudal fin even in the metamorphics. The accessory rays over­ lap and cross over in the ventral midline and are quite separate from the anterior bran­ chiostegals which are attached to the hyoid arch. Among the ophichthid eels, this con­ dition together with the complete, unab­ breviated caudal distinguishes members of the Myrophinae from the Ophichthinae (McCosker 1977). The most advanced metamorphic specimen (Albatross station D5456, Philippines, Fig­ ure IF) has a rounded snout, simple, lateral, posterior nostril, and a moderately developed pectoral fin, which is relatively as large as that of premetamorphic specimens. While ventral movement and restriction of the pos­ terior nostril to the upper lip (a position" @default.
• W2299538280 created "2016-06-24" @default.
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• W2299538280 date "1980-04-01" @default.
• W2299538280 modified "2023-09-23" @default.
• W2299538280 title "Larvae of the Ophichthid Eel Genus Neenchelys in the Indo-Pacific" @default.
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