. Bonner zoologische Monographien. Zoology. Ect Ent Ent1. : Identification of the dermal pterygoid bones in a diagrammatic medial view of the Suspensorium of diplomystids according to various authors. — A: Regan (1911); B: Fink & Fink (1981); C: present paper, apa: autopalatine; Ect: ectopterygoid; Ent: entopterygoid; Entl: 'entopterygoid' type 1; hy: hyomandibula; mtg: metapterygoid; q: quadrate. teleosts. Gosline (1975: 3) distinguished two problems concerning the names appHed to the bones of catfishes (1) nomenclatural and (2) zoological (the difficulty in identifica- tion of elem
. Bonner zoologische Monographien. Zoology. Ect Ent Ent1. : Identification of the dermal pterygoid bones in a diagrammatic medial view of the Suspensorium of diplomystids according to various authors. — A: Regan (1911); B: Fink & Fink (1981); C: present paper, apa: autopalatine; Ect: ectopterygoid; Ent: entopterygoid; Entl: 'entopterygoid' type 1; hy: hyomandibula; mtg: metapterygoid; q: quadrate. teleosts. Gosline (1975: 3) distinguished two problems concerning the names appHed to the bones of catfishes (1) nomenclatural and (2) zoological (the difficulty in identifica- tion of elements between divergent taxa). Figure 13A—C, based on diplomystids, illustrates both problems. Regan (1911) and Fink & Fink (1981), agreed only in the iden- tification of the metapterygoid. In addition, the Hgamentous connections of the metapterygoid are somewhat different from that stated by Regan (see Arratia 1987a, and below for diplomystids). According to Regan (1911: 7) the ectopterygoid is absent in Diplomystes, a small en- topterygoid is present (Fig. 13A) that connects the metapterygoid to the vomer, and fur- thermore the metapterygoid is anteriorly attached to the autopalatine and medially to the orbitosphenoid. Alexander (1965) and Fink & Fink (1981) agreed that the ec- topterygoid and entopterygoid are both present in Diplomystes, but the element which Fink & Fink (1981: Fig. 32B) identified as the entopterygoid is not homologous with the entopterygoid of Regan (1911) and Alexander (1965). This is because the en- topterygoid of Fink & Fink lacks the ligamentous connection to the cranium and has a unique position in relation to the autopalatine. I have only seen a few specimens that have had the entopterygoid Hke that described by Regan (Fig. 13A, C). When this type of 'entopterygoid' is present, it is in addition to two other bones that correspond to the ectopterygoid and entopterygoid of Lundberg (as cited in GosHne 1975) and Fink & Fink (1981
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