Bony connexions of the petrosal bone of extant hippos
The Petrosal bone of Prodremotherium sp.
Donrussellia magna Holotype
Reconstruction of the extinct rodent Canariomys bravoi
Crania of three fossil Canis lupus from Belgium
Skeletogenesis during the late embryonic development of the catshark Scyliorhinus canicula (Chondrichthyes; Neoselachii)Chondrichthyes; development; mineralization; Scyliorhinus canicula; skeleton
Current knowledge on the skeletogenesis of Chondrichthyes is scarce compared with their extant sister group, the bony fishes. Most of the previously described developmental tables in Chondrichthyes have focused on embryonic external morphology only. Due to its small body size and relative simplicity to raise eggs in laboratory conditions, the small-spotted catshark Scyliorhinus canicula has emerged as a reference species to describe developmental mechanisms in the Chondrichthyes lineage. Here we investigate the dynamic of mineralization in a set of six embryonic specimens using X-ray microtomography and describe the developing units of both the dermal skeleton (teeth and dermal scales) and endoskeleton (vertebral axis). This preliminary data on skeletogenesis in the catshark sets the first bases to a more complete investigation of the skeletal developmental in Chondrichthyes. It should provide comparison points with data known in osteichthyans and could thus be used in the broader context of gnathostome skeletal evolution.
Scyliorhinus canicula SC6_2_2015_03_20 View specimen
Scyliorhinus canicula SC6_7_2015_03_20 View specimen
Scyliorhinus canicula SC7_1_2015_04_03 View specimen
Scyliorhinus canicula SC7_5_2015_03_13 View specimen
Scyliorhinus canicula SC8_2015_03_20 View specimen
Scyliorhinus canicula SC10_2015_02_27 View specimen
M3 article infos
Published in Volume 01, Issue 04 (2016)