. Bulletin of the British Museum (Natural History) Zoology. . ***§i ^^^:- -:v5 â â '"â¢â â â¢'^L^^ . -«i*s*t^^ ^â¢-â ~*-*r. -*3^<^:â Fig. 1 Belodontichthys dinema: A, lateral view of the whole fish; B, lateral view of head; C, dorsal view of head showing overlap of teeth in the upper jaw by those in the lower jaw. Drawn from LILI 89007, 320mm SL. Scale bars = 10mm. reported by Hora (1937) is also a fast-moving pelagic and voracious fish (see p. 158). METHODS AND MATERIALS In making our phylogenetic analysis we have concentrated principally on in-group comparisons to other silurids si
. Bulletin of the British Museum (Natural History) Zoology. . ***§i ^^^:- -:v5 â â '"â¢â â â¢'^L^^ . -«i*s*t^^ ^â¢-â ~*-*r. -*3^<^:â Fig. 1 Belodontichthys dinema: A, lateral view of the whole fish; B, lateral view of head; C, dorsal view of head showing overlap of teeth in the upper jaw by those in the lower jaw. Drawn from LILI 89007, 320mm SL. Scale bars = 10mm. reported by Hora (1937) is also a fast-moving pelagic and voracious fish (see p. 158). METHODS AND MATERIALS In making our phylogenetic analysis we have concentrated principally on in-group comparisons to other silurids since our concern has been the immediate relationships of Belodontichthys. The monophyly of the family Siluridae has been demonstrated by Bornbusch (1988; 1990) and cor- roborated by our out-group comparisons with a wide-range of siluroid taxa involving the families Ariidae, Bagridae, Clariidae, Diplomystidae, Ictaluridae, Pangasiidae, Pimelodidae, Plotosidae Schilbeidae and Sisoridae. In making out-group comparisons we have accepted that the Diplomystidae represent the sister-group to all other siluroids and so follow Grande (1987) in recognising a primary division of the Siluriformes into the Diplomystoidei plus Siluroidei. Although we have also used Grande's (1987) description of the Eocene tHypsidoridae as a source for comparisons we are less sure that it truly represents the sister-group of all other siluroid families as proposed by Grande since tHypsidoris seems to possess several advanced features shared with some siluroids ( Mo pers. comra.). Nomenclature: Osteological nomenclature follows that of Patterson (1975). We have adopted the term posttemporo- supracleithrum used by Arratia (1987) since we believe this most satisfactorily describes the structure whose incorporated elements are a matter of debate (Lundberg, 1975; Fink & Fink, 1981; Howes, 1983a; Arratia, 1987). Muscle nomen- clature follows that of Winterbottom (1974). Reference to Ompok in
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