. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 126 Bulletin Museum of Comparative Zoolo^,y, Vol. 150, No. 3 lateral line canal. Figure 22. Lateral line scale of Osteoglossum bicirrtio- sum. The scale is typically ornamented. The radii form a coarse and irregularly reticulated pattern, both apically and basally. (After Taverne, 1977.) worms and wormlike insects. The mor- myrids largely occupy nocturnal bottom feeding niches in the rivers of Africa. Gymnarchus niloticiis, often placed in a separate family Gymnarchidae, is a close relative of the mormyrid fishes. The
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 126 Bulletin Museum of Comparative Zoolo^,y, Vol. 150, No. 3 lateral line canal. Figure 22. Lateral line scale of Osteoglossum bicirrtio- sum. The scale is typically ornamented. The radii form a coarse and irregularly reticulated pattern, both apically and basally. (After Taverne, 1977.) worms and wormlike insects. The mor- myrids largely occupy nocturnal bottom feeding niches in the rivers of Africa. Gymnarchus niloticiis, often placed in a separate family Gymnarchidae, is a close relative of the mormyrid fishes. The last clade in the Notopteroidei is the genus Hiodori, with two extant species, Hiodon tergisus and H. alo- soicles. These are the only osteoglosso- morphs found in North American waters. Although Hiodon is often cited as being a very primitive teleost, it shows many specializations, especially in the brain- case and swimbladder (Greenwood, 1973). The swimbladder has a diverticu- Imn on each side extending anteriorly into the ear. Within the ear, this diverticulum is separated by a thin membrane from a vesicle which is filled with perilymph and connected with the utriculus of the inner ear via a foramen in the prootic bone. The Elopomorpha The Elopomorpha contains about 650 species (J. Nelson, 1976) which vary tre- mendously in body fomi and habit from the more conventionally shaped mega- lopids (tarpons) to the highly aberrant saccopharyngoid deepsea eels. Elopo- morph fishes may be divided into seven major groups: the Elopidae, tenpoun- ders; the Megalopidae, tarpons; the Al- bulidae, bonefishes; the anguilloids, eels, containing about 600 of the 650 elopo- morph species and about 19 families; the saccopharyngoids, bathypelagic eels; the Halosauridae, deep-sea halosaurs; and the Notacanthidae, deep-sea spring eels. The interrelationships of these groups has been a matter of considerable debate in recent years, and elopomorph phylog- eny has been most recently considered by Gr
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