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New Data on Silurian and Devonian Chonetacean Brachiopods from Bolivia

Patrick R. Racheboeuf and Leonardo Branisa
Journal of Paleontology
Vol. 59, No. 6 (Nov., 1985), pp. 1426-1450
Stable URL: http://www.jstor.org/stable/1304957
Page Count: 25
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New Data on Silurian and Devonian Chonetacean Brachiopods from Bolivia
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Abstract

Study of new chonetacean brachiopod material from Bolivia allows further understanding of this superfamily in South America. Specimens were collected by one of us (L.B.) from Silurian (Kirusillas and Cordillera Real formations) through Middle Devonian strata in Bolivia. Thirteen taxa are described, including one new genus and five new species. New taxa are: Quadrikentron iclaense n. sp., Q. havliceki n. sp., Babinia parvula n. gen., n. sp., Anoplia belenensis n. sp. and Aseptonetes? isaacsoni n. sp. Ulrich's (1893) species Chonetes rücki and Chonetes stübeli are redefined with the aid of original specimens; lectotypes are erected and the two species are respectively referred to the genera Quadrikentron Boucot and Gauri, 1966, and Austronoplia Isaacson, 1977. No specimen of the family Strophochonetidae was previously known in the Bolivian Lower Devonian; although the relative stratigraphic position of the four species described herein remains partly questionable, they are tentatively interpreted as an evolutionary trend similar to that shown for the genus Ctenochonetes in the southwestern European Lower Devonian. The presence of Anoplia and Quadrikentron in the Bolivian Lower Devonian increases the relative importance of North American chonetacean taxa in Bolivian faunas.

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