. Bonner zoologische Monographien. Zoology. 55 Nematogenyids General information on the Suspensorium of Nematogenys inermis may be found in Arratia (1990a: 207); here I will provide additional information. The elements of the Suspensorium form similarly to those of Ictalurus, but the position and size of bones of the Suspensorium and cranium vary. The autopalatine (Figs. 28A, D, 29A, B) is broader anteriorly than posteriorly, similar to the condition present in diplomystids and ^Hypsidoris. The anterior cartilage of the autopalatine is large and lies in a dorsolateral cavity of the premaxilla.
. Bonner zoologische Monographien. Zoology. 55 Nematogenyids General information on the Suspensorium of Nematogenys inermis may be found in Arratia (1990a: 207); here I will provide additional information. The elements of the Suspensorium form similarly to those of Ictalurus, but the position and size of bones of the Suspensorium and cranium vary. The autopalatine (Figs. 28A, D, 29A, B) is broader anteriorly than posteriorly, similar to the condition present in diplomystids and ^Hypsidoris. The anterior cartilage of the autopalatine is large and lies in a dorsolateral cavity of the premaxilla. Laterally, the small maxilla articulates through two small articular processes with the anterior car- tilage. At about half of the length of the autopalatine is an elongate articular facet for the lateral ethmoid and vomer; there is a direct articulation between the autopalatine and lateral ethmoid, and an indirect articulation via cartilage with the vomer. There is a mass of fibrocartilage at the posterior end of the autopalatine; it is closely attached by connective tissue with a small cup-Hke sesamoid bone, the 'entopterygoid' type 2. This 'entopterygoid' is connected by a short hgament to the metapterygoid, and by a long ligament to the vomer. Neither an ectopterygoid or an 'ectopterygoid' are present. The metapterygoid forms similarly to that of diplomystids and Ictalurus (compare Figs. 16A—C, 25A, B, 28A). The metapterygoid (Fig. 28A, D) is the largest element of the palatoquadrate; dorsally it has a small notch separating the anterior region from the posterior one. The anterior region produces a sharp, short processus basalis. Ventro- Ant apa mtg Pmx Mx apa. A B : Autopalatine and surrounding bones in Nematogenys inermis (PC 30873). — A: Dorsal view; B: Ventral view; A,B same scale. Ant: antorbital; apa: autopalatine; : cartilage joining lateral ethmoid, vomer, and mesethmoid; Ent2: 'entopterygoid' type 2; 'ent': 'entopterygoid'-metapterygoid
Size: 2109px × 1184px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
