Scales of palaeoniscoid fishes (Osteichthyes: Actinopterygii) from the Late Devonian of Western Australia

WA Museum Records and Supplements | Updated 9 years ago

Abstract: The squamation of an articulated specimen of the palaeoniscoid Mimia toombsi from the Frasnian Gogo Formation is described following the descriptive terminology of Esin (1990). Scales of various forms are attributed to specific regions of the body in accordance with Esin (1990) and Burrow (1994). Varieties of isolated scales from the Givetian-Frasnian Gneudna Formation are referred to Mimia toombsi on the basis of comparisons with the described articulated specimen.

Additional scales from the Gneudna Formation are attributed to Moythomasia durgaringa based on ornament, scale shape, the articulation device and the tubercle shape on the ganoine surface. These scales characterize different stages in the development of M. durgaringa (sensu Esin 1995). Scales representing both the juvenile and subadult stages of development are identified.