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Silurian calymenid trilobite Alcymene n. gen., with new species from the Ludlow of Gotland, Sweden

Published online by Cambridge University Press:  20 May 2016

Lars Ramsköld ,
Jonathan M. Adrain ,
Gregory D. Edgecombe  and
Derek J. Siveter
Lars Ramsköld
Affiliation:
Museum of Palaeontology, University of Uppsala, Norbyvägen, S-752 36 Uppsala, Sweden
Jonathan M. Adrain
Affiliation:
Department of Geology, University of Alberta, Edmonton, Canada T6G 2E3
Gregory D. Edgecombe
Affiliation:
Earth and Environmental Sciences, Australian Museum, P.O. Box A285 Sydney South, N.S.W. 2000, Australia
Derek J. Siveter
Affiliation:
The University Museum, Parks Road, Oxford OX1 3PW, United Kingdom
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Abstract

Alcymene n. gen. comprises a monophyletic group of calymenids known from the Ludlow Series of Sweden and the British Isles. The sister species Alcymene alveus and A. lindstroemi n. gen. and spp. (Hemse Beds, Gotland, Sweden) are most closely related to the type species A. neointermedia (Richter and Richter), which occurs in overlying and underlying strata at nearby localities. Structural modification of A. alveus and A. lindstroemi, especially the development of a greatly broadened and troughed librigenal border, can be interpreted as “snowshoe” adaptations for increased stability on an offshore mud substrate.

Type
Research Article
Information
Journal of Paleontology , Volume 68 , Issue 3 , May 1994 , pp. 556 - 569
Copyright
Copyright © The Paleontological Society 

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