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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Dunkleosteus, Placodermi, Arthrodira, Eastmanosteus, Materpiscis, Ptyctodontida, Acanthothoraci, Bothriolepis, Rhenanida, Pseudopetalichthyida, Weejasperaspididae, Titanichthys, Stensioella, Gemuendina Stuertzi, Coccosteus, Phyllolepida, Antiarchi, Petalichthyida, Pterichthyodes, Brindabellaspis, Coccosteina, Groenlandaspis, Dinichthyidae, Campbellodus, Ctenurella, Jagorina, Dinichthyloidea, Lunaspis, Phyllolepis, Incisoscutum, Holonema, Rolfosteus Canningensis, Phlyctaeniidae, Carolowilhelmina, Brachythoraci, Turrisaspis, Aleosteus, Quasipetalichthys, Heintzichthys Gouldii, Neophlyctaenius, Dicksonosteus, Actinolepidae, Arctolepis, Mithakaspis, Heterogaspis, Huginaspis, Heintzosteus, Arctaspis, Gavinaspis, Kueichowlepis, Pageauaspis, Rhachiosteus, Elegantaspis, Cartieraspis, Gaspeaspis, Prosphymaspis, Diadsomaspis, Kolpaspis, Phlyctaenius, Aggeraspis, Rhamphodopsis, Holdenius, Gorgonichthys, Bruntonichthys, Homostius, Minicrania. Excerpt: Acanthothoraci Fossil range: Silurian ? - Early Devonian Description The Acanthothoraci ("Spine Chests") were a group of chimaera -like placoderms who were closely related to the rhenanid placoderms. Superficially, the acanthoracids resembled scaly chimaeras, lightly armored arthrodires , or (relatively) heavily armored ptyctodonts . They were distinguished from chimaeras by the presence of large scales and plates, a pair of large spines that emanate from their chests (thus, the order's name), tooth-like beak plates, and the typical bone-enhanced placoderm eyeball. They were distinguished from other placoderms due to differences in the anatomy of their skulls, and due to patterns on the skull plates and thoracic plates that are unique to this order. The acanthothoracids were once thought to be closely related to the rhenanids because of simil... |
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