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BAP381 Cover.Indd Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley Th omas R. Waller Bulletins of American Paleontology Number 381, July 2011 BULLETINS OF AMERICAN PALEONTOLOGY Established 1895 Paula M. Mikkelsen Warren D. Allmon Editor-in-Chief Director Editorial Board Jason S. Anderson, University of Calgary Kenneth Angielczyk, Field Museum of Natural History Carlton Brett, University of Cincinnati Ann F. Budd, University of Iowa Peter Dodson, University of Pennsylvania Daniel Fisher, University of Michigan Dana H. Geary, University of Wisconsin-Madison Peter J. Harries, University of South Florida John Pojeta, United States Geological Survey Carrie E. Schweitzer, Kent State University Geerat J. Vermeij, University of California at Davis Emily H. Vokes, Tulane University (Emerita) William Zinsmeister, Purdue University Bulletins of American Paleontology is published semiannually by Paleontological Re- search Institution. For a list of titles and to order back issues online, go to http://museum- oftheearth.org. Numbers 1-94 (1895-1941) of Bulletins of American Paleontology are available from Periodicals Service Company, Germantown, New York, http://www.pe- riodicals.com. Subscriptions to Bulletins of American Paleontology are available in hard-copy and electronic formats to individuals or institutions; non-US addressees pay an additional fee for postage and handling. For current rates, additional information or to place an order, see http://museumoftheearth.org or contact: Publications Offi ce Paleontological Research Institution 1259 Trumansburg Road Ithaca, New York 14850-1313 Tel. (607) 273-6623, ext. 20 Fax (607) 273-6620 [email protected] Th is paper meets the requirements of ANSI/NISO Z39.48-1992 (Permanence of Paper). Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley Th omas R. Waller Bulletins of American Paleontology Number 381, July 2011 ISSN 0007-5779 ISBN 978-0-87710-494-0 Library of Congress Catalog Card Number 2011931850 © 2011, Paleontological Research Institution, 1259 Trumansburg Road, Ithaca, New York 14850, U. S. A. NEOGENE PALEONTOLOGY OF THE NORTHERN DOMINICAN REPUBLIC. 24. PROPEAMUSSIIDAE AND PECTINIDAE (MOLLUSCA: BIVALVIA: PECTINOIDEA) OF THE CIBAO VALLEY Thomas R. Waller Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012 USA, email [email protected] ABSTRACT Based on approximately 25,000 specimens from the Miocene and Pliocene of the Cibao Valley, northern Dominican Republic, the bivalve family Propeamussiidae is represented by two genera and four species, including two new species, Cyclopecten acuminatus and C. zalaya; the family Pectinidae is represented by three subfamilies, six tribes, 18 genera, and 35 species. New taxa in the Pectinidae include six new genera (Interchlamys, Chagrepecten, Gurabopecten, Paraleptopecten, Zamorapecten, and Antillipecten), 15 new species (Caribachlamys guayubinensis, C. jungi, Mimachlamys blowi, M. vokesorum, Palliolum? cibaoense, Argopecten parathetidis, Chagrepecten paracactaceus, Gurabopecten uniplicatus, Lindapecten baitoaensis, L. paramuscosus, Euvola gurabensis, Zamorapecten maoensis, Antillipecten janicoensis, A. microlineatus, and A. quemadosensis), one species in open nomenclature (Paraleptopecten sp. a), and one new subspecies (Argopecten eccentricus lacabrensis). In addition, a new name, Euvola jamaicensis, replaces the name E. barretti (Woodring, 1925). Lectotypes are designated for Cyclopecten guppyi (Dall, 1898) and Cryptopecten phrygium (Dall, 1886). Four of the genera (20%) and all but four of the species (90%) in the two families are extinct. Among the Pectinidae, 60% of the species but only 5% of the genera are endemic to the northern Dominican Republic. Th e high species endemism is possibly an artifact due to the absence in many other regions of precisely correlative strata as well as to diff erences in facies and sampling methods. Assemblages of the two families change composition going upward in stratigraphic sections measured along each major river, refl ecting increasing depth of deposition, changing bottom conditions, and association with coral reefs or marine grasses and algae. Evolutionary changes within particular lineages help to resolve several previous biostratigraphic uncertainties and controversies, including the age of limestones on the Río Yaque del Norte and in the Guayubín area. Detailed study of these changes has also shed new light on the causes of dramatic faunal diff erences between stratigraphic sections on the Río Gurabo and Río Mao, separated by only 10 km. RESUMEN El estudio de aproximadamente 25,000 ejemplares del Mioceno y Plioceno marino del Valle del Cibao, en el norte de la República Dominicana, nos permite indicar que la familia de bivalvos Propeamussiidae está representada por dos géneros y cuatro especies, dos de ellas especies nuevas, Cyclopecten acuminatus y C. zalaya, y que la familia Pectinidae está representada por tres subfamilias, seis tribus, 18 géneros y 35 especies. Los taxones nuevos de Pectinidae incluyen seis géneros nuevos (Interchlamys, Chagrepecten, Gurabopecten, Paraleptopecten, Zamorapecten y Antillipecten), 15 especies nuevas (Caribachlamys guayubinensis, C. jungi, Mimachlamys blowi, M. vokesorum, Palliolum? cibaoense, Argopecten parathetidis, Chagrepecten pa- racactaceus, Gurabopecten uniplicatus, Lindapecten baitoaensis, L. paramuscosus, Euvola gurabensis, Zamorapecten maoensis, Antillipecten janicoensis, A. microlineatus y A. quemadosensis), una especie en nomenclatura abierta (Paraleptopecten specides a) y una subespecie nueva (Argopecten eccenttricus lacabrensis). Además, un nombre nuevo, Euvola jamaicensis, reemplaza el nombre E. barretti (Woodring, 1925). Lectotipos de Cyclopecten guppyi (Dall, 1998) y Cryptopecten phrygium (Dall, 1886) son designados. Cuatro de los géneros (20%) y todas de las especies excepto cuatro (90%) en las dos familias, están extintas. Entre los Pectinidae, 60% de las especies pero solamente 5% de los géneros son endémicos para el norte de la República Dominicana. El alto endemismo de las especies posiblemente es un artefacto parcialmente causado por la ausencia de estratos exactamente correlacionados en muchas otras regiones asi como por diferencias en las facies y en los métodos de muestreo. Los asociasiones de las especies cambian en su composición a lo largo de cada río principa a medida que ascendemos es- tratigrafi camente, lo que refl eja aumentos en la profundidad de deposición, cambios en las condiciones del fondo y el grado de asociación con los arrecifes de coral o los céspedes marinos y las algas. Los cambios evolutivos en algonos llinajes nos permiten solucionar algunas incertidumbres estratigráfi cas y controversias, incluyendo la edad de las calizas en el Río Yaque del Norte y en la region de Guayubín. El estudio detallado de estos cambios nos ha permitido iluminar las causas de las diff erencias faunisticas grandes entre las secciones estratigráfi cas del Río Gurabo y el Río Mao, los que están separados por solamente 10 km. 2 Bulletins of American Paleontology, No. INTRODUCTION are commonly well preserved in the fossil record. Coupled Th e Dominican Republic Project was launched in 1977 by with the rapid rates of evolution of many genera in the family Peter Jung and John B. Saunders of the Naturhistorisches Pectinidae as well as clear changes in the composition of pec- Museum Basel (NMB), Switzerland, for the purpose of doc- tinid faunas with depth, this group is of particular biostrati- umenting in detail the systematic paleontology, biostratig- graphic and paleoecological interest. For these reasons, the raphy, and paleoecology of the thick Miocene and Pliocene family Pectinidae has served as a basis for biostratigraphic zo- stratigraphic sections well exposed in the Cibao Valley. From nation in many parts of the world, particularly in the Cenozoic 1978-1980, Jung, Saunders, and others (listed by Saunders (e.g., MacNeil, 1967: 2; Ward & Blackwelder, 1975; Addicott, et al., 1986: 9), working with a team of French surveyors led 1978; Smith, 1991b; Beu, 1995: 10; Mandic, 2004) . by Bernard Biju-Duval, made collections of macro- and mi- crofossils that were precisely stratigraphically documented. BACKGROUND Th e collections (ca. 5 tons) were processed and meticulously Saunders et al. (1986: 10-11) and E. Vokes (1989) reviewed sorted in Basel, and parts of the sorted material were sent on previous paleontological and stratigraphic studies in the loan to taxonomic specialists for detailed study. Dominican Republic. Th e fi rst extensive collecting expedition Th e resulting studies have led to a long and continuing to yield fossils with detailed locality and stratigraphic data is series of publications, mainly in the Bulletins of American that of Maury (1917a, b), who described 14 species of pec- Paleontology, dealing thus far with planktic foraminiferans, tinids including four new species. However, only nine of these calcareous nannoplankton, corals, bryozoans, brachiopods, taxa are valid, the others being junior synonyms or misiden- mollusks, echinoids, and fi sh otoliths. Th e fi rst contribution in tifi cations. Pilsbry & Johnson (1917), in a study that over- this series is the familiar "red book" by Saunders et al. (1986) lapped the work of Maury (1917a), introduced three more that has been on the desk of
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