Web25. sep 2024 · In petalichthyids such as Eurycaraspis, the overlapped area is well defined laterally from the rest of the skull roof and is named the posterior descending lamina. (8) Presence or absence of a lateral ridge or process (mesial articular process in [ 48 ]) defines the mesial boundary of the visceral contact face for the articular lamina on the ... Web10. sep 2024 · The petalichthyids are placoderm-grade stem-group gnathostomes known from both isolated skeletal material and rarer articulated specimens of one genus.
Petalichthys capensis, Cape needlefish
Web5. feb 2024 · Europe PMC is an archive of life sciences journal literature. Web3. apr 2010 · Some fresh water needlefishes reach only 6 or 7 cm in total length while some marine species may attain 2 m. Composition of Family: The Belonidae contains 10 genera and 34 species. Four genera are monotypic: the southern African Petalichthys, the worldwide Ablennes and Platybelone, and apparently the Asian freshwater Xenetodon. … nauvoo the expanse
A new Silurian fish close to the common ancestor of
Web23. aug 2024 · This condition differs from Qilinyu, Entelognathus, arthrodires, and petalichthyids and is typically seen in antiarchs. 17. Paired fins. The right pectoral and pelvic fins are well preserved in the holotype, with complete outlines and intact squamations (Figure 1). The pectoral fin is small and broad, in total 2.8 mm long and 2.5 mm wide. Weblepids or petalichthyids. A complete canal commissure between the centers of ossification of the centrals appears to be present in at least some specimens of Coccosteus decipiens (Heintz, 1931, fig. 2) and C. fletti (Watson, 1932, fig. 1). In addi-tion, a canal extends medially from the center of ossification of the central in at least Webpetalichthyid (plural petalichthyids) Any extinct placoderm fish of the order ... nauvoo to carthage