. Bonner zoologische Monographien. Zoology. 131 Homology of entopterygoid and 'entopterygoid' The entopterygoid is a small dermal bone that may or may not be present in diplo- mystids. The diplomystid dermal entopterygoid is homologous with that of other tele- osts and non-teleostean fishes (Arratia & Schultze 1991). The 'entopterygoid' is a ten- don bone by origin and a sesamoidal element connected by hgaments to other bones of the Suspensorium and cranial elements, unlike the dermal entopterygoid. 'Entopterygoid' type 1, occasionally present in Olivaichthys, is a new formation. 'En- topt
. Bonner zoologische Monographien. Zoology. 131 Homology of entopterygoid and 'entopterygoid' The entopterygoid is a small dermal bone that may or may not be present in diplo- mystids. The diplomystid dermal entopterygoid is homologous with that of other tele- osts and non-teleostean fishes (Arratia & Schultze 1991). The 'entopterygoid' is a ten- don bone by origin and a sesamoidal element connected by hgaments to other bones of the Suspensorium and cranial elements, unlike the dermal entopterygoid. 'Entopterygoid' type 1, occasionally present in Olivaichthys, is a new formation. 'En- topterygoid' type 1 and a dermal entopterygoid are both present in a single individual, therefore the two elements are non-homologous. According to the distribution of this character (Fig. 51) among catfishes, the 'en- topterygoid' (except for 'entopterygoid' type 1) is homologous with the entopterygoid present in diplomystids. For such a scheme of homology to be true, I have had to assume that "fHypsidoris had either a entopterygoid or an 'entopterygoid', or that the loss of one or another bone in '\Hypsidons is an autapomorphy of this fish. The 'entopterygoid' has a variety of ligamentous connections in catfishes (Fig. 2B—G); it is very probable that more patterns will be added to figure 2A—G as more catfishes are studied. The diversity of ligamentous connections of the 'entopterygoid' may be useful for taxonomic and phylogenetic purposes in 0 'Enf Ect Ent : Distribution of certain palatal bones in catfishes. — Entopterygoid (Ent) and 'entopterygoid' ('Ent'); ectopterygoid (Ect) and 'ectopterygoid' ('Ect'). 0 = absence of the bone; ?: unknown Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
Size: 2279px × 1097px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
