Abstract
Morphological shape change patterns show relatively greater variation within members of the Atrypinae subfamily than those from the Variatrypinae subfamily for brachial valves while relatively less variation within Atrypinae subfamily than the Variatrypinae subfamily for pedicle valves suggesting minor distinction in morphological variation between the two subfamilies. Copper (1973) outlined a few new Siluro-Devonian species-groups within the Atrypidae order from eastern North American forms from Anticosti island and the interior Devonian carbonate platform. Atrypides possess ribs normally interrupted by growth lamellae, with a generally small pedicle foramen, small interarea, lacking deltidial plates occasionally but usually with small, disjunct hollow deltidial plates (rarely associated with collars), with disjunct jugal processes tipped by small plates, generally poorly developed dental cavities. The shell surface may be projected as frills or spines with their crowding along the anterior margins or may even evolve in directions towards loss of growth lamellae and development of continuous ribs.
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Bose, R. (2013). Discussion. In: Palaeobiology of Middle Paleozoic Marine Brachiopods. SpringerBriefs in Earth Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-00194-4_4
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