. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 122 Bulletin Museum of Comparative Zoolofiy, Vol. 150, No. 3 Hbl Hbl Gr Cbl. Hpic Bb1 PrI Figure 18. Ventral gill arch muscles and sternohyoideus (SH) of Scleropages in left lateral view (from Greenwood [1971], courtesy of the Trustees of the British Museum [Nat. Hist.]). The hypohyal has been partly cut away. Note the prominent bony process on the second gill arch indicated by the arrow. Abbreviations: Bbl, basibranchial one; Cb l-V, ceratobranchials (arches l-V); CL, cleithrum; CT, connective tissue sur- rounding la
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 122 Bulletin Museum of Comparative Zoolofiy, Vol. 150, No. 3 Hbl Hbl Gr Cbl. Hpic Bb1 PrI Figure 18. Ventral gill arch muscles and sternohyoideus (SH) of Scleropages in left lateral view (from Greenwood [1971], courtesy of the Trustees of the British Museum [Nat. Hist.]). The hypohyal has been partly cut away. Note the prominent bony process on the second gill arch indicated by the arrow. Abbreviations: Bbl, basibranchial one; Cb l-V, ceratobranchials (arches l-V); CL, cleithrum; CT, connective tissue sur- rounding lateral and ventral edges of basihyal and Its anterior tooth plate; Gr, gill rakers; Hb I and II, hypobranchial of first and second arch; Hpic, hypohyal (cut through); Ob 1-3, obliquus muscle (1st-3rd gill arches), PhC A and P, external and internal pharyngocleithralis muscles; PRII, bony process from second hypobranchial; R, rectus muscle; SH, ster- nohyoideus muscle. larged cerebellum of the electrogenic ed into two major clades, the Notopter- momiyrids clearly represent specialized oidei, containing the families Notopteri- conditions. idae, Mormyridae, and Hiodontidae, and The Osteoglossomorpha may be divid- the Osteoglossoidei containing the Os- Figure 19. Phylogenetic relationships of the Osteoglossomorpha. Characters are: 1, "shearing bite" between the ba- sihyal teeth and lateral pterygoquadrate teeth; 2, small premaxilla firmly fixed to the skull; 3, intestine coils to left of esophagus and stomach (Nelson, 1972); 4, Taverne (1979) has recently proposed (but also see Gosline, 1960; Greenwood et 1966) that osteoglossomorphs share a distinctive caudal skeleton in which one or more epurals are fused with neural arches of the caudal to form "neurepurals"; 6, parapophyses fused with vertebral centra; 7, loss of supramaxillae; 8, other, more questionable characters proposed for the Osteoglossomorpha include reticulate scales, 16 or fewer branched caudal
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