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Neogene Cupuladriidae of tropical America. I: Taxonomy of Recent Cupuladria from opposite sides of the Isthmus of Panama

Published online by Cambridge University Press:  14 July 2015

Amalia Herrera-Cubilla ,
Matthew H. Dick ,
Joann Sanner  and
Jeremy B. C. Jackson
Amalia Herrera-Cubilla
Affiliation:
Center for Tropical Paleoecology and Archeology, Smithsonian Tropical Research Institute, Box 2072, Balboa, Republic of Panama,
Matthew H. Dick
Affiliation:
COE Program on Neo-Science of Natural History, Graduate School of Science, Hokkaido University, Sapporo 060–0810 Japan,
Joann Sanner
Affiliation:
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560,
Jeremy B. C. Jackson
Affiliation:
Center for Tropical Paleoecology and Archeology, Smithsonian Tropical Research Institute, Box 2072, Balboa, Republic of Panama, Scripps Institution of Oceanography, University of California-San Diego, La Jolla 92093-0244,
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Abstract

We used up to 28 morphological characters to discriminate and describe species of the genus Cupuladria based on entire colony specimens collected from both coasts of the Isthmus of Panama. The characters included a combination of zooidal features traditionally used in cheilostome taxonomy and nontraditional characters such as colony size, shape, and an index of calcification of the colony, as well as the size of the basal sectors and their number of pores. Species were discriminated by a series of repeated multivariate cluster and discriminant analyses until the majority of specimens were assigned to their putative species with high statistical confidence. Nontraditional characters contributed significantly to the power of the analyses. Colonies fell into two highly distinct groups most clearly recognized by the presence or absence of vicarious avicularia, which agrees well with previous molecular genetic analyses. Further analyses of each of these two groups considered separately resulted in the discrimination of eight species. These include two previously described Caribbean species, C. biporosa Canu and Bassler, 1919 and C. surinamensis Cadée, 1975, and six new species: C. multesima, C. incognita, C. cheethami, and C. panamensis from the Caribbean, and C. pacificiensis and C. exfragminis from the eastern Pacific. There was also good correspondence between major clades within these morphologically defined groups and the previous molecular analysis, although 20% of the specimens could not be distinguished from their cognate (“geminate”) species from the opposite ocean. The high ratio of undescribed to described species and higher diversity in the Caribbean than eastern Pacific agree well with newly described patterns from other cheilostome genera based on similar analyses. Quantitative morphometric studies are essential to study biologically meaningful patterns of cheilostome speciation and macroevolution in the fossil record.

Type
Research Article
Information
Journal of Paleontology , Volume 80 , Issue 2 , March 2006 , pp. 245 - 263
Copyright
Copyright © The Paleontological Society 

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