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Free Content Biogeography of Adeonella (Bryozoa, Cheilostomata): A Preliminary Account

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Abstract:

The Bryozoan genus Adeonella has a broad, though disjunct, distribution in the southern hemisphere. The type species, A. platalea, is widespread in the western Pacific and the eastern Indian Oceans. It is a morphologically variable species in which zooidal polymorphism is highly developed. There are relatively few other species of Adeonella in the Indo-West-Pacific region. By contrast, the western Indian Ocean fauna comprises a substantial number of species; degrees of polymorphism vary greatly between these species and the fauna includes a number of forms in which polymorphic features are at a minimum. The fossil record is meager and Tertiary representatives of the genus seem to be confined to European horizons; the Atlantic-Mediterranean species A. polystomella is common in Miocene and Pliocene deposits of southern Europe. The striking contrast between the Adeonella faunas of the Indo-West-Pacific region and the South African region of the western Indian Ocean seems to reflect different evolutionary histories.

Document Type: Research Article

Publication date: 1983-07-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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