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Systematics and paleo ecology of the silurian gastropods of the arisaig group nova scotia canada


, : Systematics and paleo ecology of the silurian gastropods of the arisaig group nova scotia canada. Kongelige Danske Videnskabernes Selskab Biologiske Skrifter 21(2): 1-90

A fauna of more than 60 spp. of Silurian (Llandovery - Pridoli) gastropods is described from the Arisaig Group of Nova Scotia, Canada, and compared to similar faunas from Britain. The following new species are described: Tropidodiscus (?) arisaigensis, Umbospira yochelsoni, Holopea rossbrookiensis and Murchisonia (s.l.) antigonishensis. The mode of life of Lower Palaeozoic gastropods in general is discussed prior to examination of the palaeoecology of gastropods from the nearshore, level-bottom sequence of communities at Arisaig. Three basic gastropod faunas are recognized. A trochiform pleurotomariacean dominated shallow marine platform fauna in the Beechhill Cove Formation is related to a hard substratum. Most later formations have assemblages adapted to softer substrata which can be referred either to an open lagoon fauna or to a soft substratum shallow marine platform fauna. Morphologically similar representatives of these faunas characterize successive regressive phases of sedimentation. The abundance of trilobed plectonotinid bellerophontaceans throughout the sequence is equated with the nearshore environment of deposition.

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