Jan H. Stock Memorial Issue SOME OF THE DEEP-SEA FAUNA IS ANCIENT BY GEORGE D. F. WILSON Centre for Evolutionary Research, Australian Museum, 6 College Street, Sydney, NSW 2000, Australia ABSTRACT Decreasing deep-sea ¯ oor temperatures during the mid Cainozoic, and a presumed widespread disoxia in the deep sea prior to this era has lead many authors to suggest that the deep-sea fauna has accumulated during the last 30-40 mybp only. This hypothesis argues for extinction and replace- ment of earlier faunas. Some taxa, such as the Ostracoda, show extensive taxonomic replacement during the Miocene that is correlated with declining sea ¯ oor temperatures. A recent evaluation of the deep Atlantic distribution of major isopod clades, however, demonstrated that two different historical patterns are present. One pattern ( ª Flabellifera º ) conforms to a relatively recent Caino- zoic and ongoing colonization of the deep sea, with relative impoverishment of species with depth. The other pattern (Asellota) is one that is rich in deep-sea species, and has a high level of endemic morphological diversity, suggesting a long period of evolution in isolation. Glaciation during the late Palaeozoic and an early phylogenetic origination of the Asellota support the hypothesis
Crustaceana – Brill
Published: Jan 1, 1999
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