Pennsylvanian extinctions

Chitinozoa (singular: chitinozoan, plural: chitinozoans) are a group of flask-shaped, organic walled marine microfossils produced by an as yet unknown organism. Common from the Ordovician to Devonian periods (i.e. the mid-Paleozoic), the millimetre-scale organisms are abundant in almost all types of marine sediment across the globe. This wide distribution, and their rapid pace of evolution, makes them valuable biostratigraphic markers.

Baphetidae is an extinct family of stem-tetrapods. Baphetids were large labyrinthodont predators of the Late Carboniferous period (Namurian through Westphalian) of Europe. Fragmentary remains from the Early Carboniferous of Canada have been tentatively assigned to the group. The phylogenetic relationships of baphetids is uncertain; while many studies have placed the group as a close relative of Amniota, other analyses have found Baphetidae to be a more basal clade of early stem tetrapods. Baphetids were among the first of the Carboniferous fossil tetrapods to be found and were originally descr

Gephyrostegidae is an extinct family of stegocephalian tetrapodomorphs from the Late Carboniferous including the genera Gephyrostegus, Bruktererpeton, and Eusauropleura. Gephyrostegus is from the Czech Republic, Brukterepeton is from Germany, and Eusauropleura is from the eastern United States.

REDIRECT Tesnusocarididae

Symmoriidae is an extinct family of cartilaginous fish belonging to the order Symmoriiformes. Members of the family are known from the Devonian and Carboniferous periods.

Oestocephalidae is an extinct family of Late Carboniferous aistopod tetrapodomorphs. Fossils have been found from Ohio, Illinois, and Colorado in the United States; England; and the Czech Republic. It includes the genera Coloraderpeton and Oestocephalus. Oestocephalids have robust skulls and narrow, rounded snouts. They possess heavily ossified gastralia and dorsal osteoderms. Like other aïstopods, oestocephalids were elongate, having approximately 110 vertebrae. Oestocephalidae was named in 2003, with the type species being Oestocephalus amphiuminus.

Stethacanthidae is an extinct family of prehistoric sharks. It is estimated to have existed approximately between 380 and 300 million years ago. Members of this family are noted for their peculiar dorsal fin.

Tesnusocarididae is an extinct family of remipedes and the sole member of the order Enantiopoda. It contains two genera, the type genus Tesnusocaris, and Cryptocaris, both known from the Carboniferous, with Tesnusocaris known from the Lower Pennsylvanian Tesnus Formation and Cryptocaris from the Middle Pennsylvanian Mazon Creek fossil beds.

The Urocordylidae are an extinct family of nectridean lepospondyl amphibians. Urocordylids lived during the Late Carboniferous and Early Permian in what is now Europe and North America and are characterized by their very long, paddle-like tails. In life, they were probably newt-like and aquatic.

Zosterogrammidae is an extinct family of millipedes containing three genera, each with a single species. Fossils are known from the Czech Republic, Scotland, and the USA. Zosterogrammidae constitutes the sole family of the order Zosterogrammida.

Ornithoprion is an extinct genus of cartilaginous fish. The only species, O. hertwigi, lived during the Moscovian stage of the Pennsylvanian subperiod, which spanned from . Its fossils are preserved in black shales from what is now the Midwestern United States. The study of Ornithoprion was performed primarily via x-ray imaging, and at the time of its discovery it represented one of the best known holocephalans of the Paleozoic era. The classification of the genus has been the subject of debate due to its unique anatomy, and it is now placed in the order Eugeneodontiformes and the family Caseo

Vicissicaudata is an unranked group of artiopodan arthropods, containing Cheloniellida, the speciose Aglaspidida, and several other genera outside these groups like Sidneyia and Emeraldella.