The Pectinoiden genera Delectopecten Stewart, 1930 and Parvamussium Sacco, 1897 in the Danian of Patagonia (Argentina).

DEL RÍO CLAUDIA,; BEU ALAN; MARTINEZ SERGIO,

Neues Jahrbusch für Geologie Paläontologie

Lugar: Stuttgart; Año: 2008 p. 281 - 295

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} p.MsoBodyText3, li.MsoBodyText3, div.MsoBodyText3 {margin:0cm; margin-bottom:.0001pt; text-align:justify; line-height:150%; mso-pagination:widow-orphan; font-size:12.0pt; mso-bidi-font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; text-transform:uppercase;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> The pectinoidean genera Delectopecten STEWART, 1930 and Parvamussium SACCO, 1897 in the Danian of Northern Patagonia, Argentina. –Abstract: The pectinoidean genera Delectopecten STEWART, 1930 (Family Pectinidae) and ParvamussiumSACCO, 1897 (Family Propeamussiidae) are poorly known from Paleocene rocks. Thepresent study provides the first fossil record of Delectopecten in Argentina, with the description oftwo new species, Delectopecten neuquenensis n. sp. and Parvamussium bayosense n. sp., from theDanian Jagüel and Roca formations of the Neuquen Basin (Río Negro and La Pampa provinces).Parvamussium and Delectopecten have a cosmopolitan distribution at present, mostly inhabitingabyssal and bathyal depths, with the highest species diversity in the tropical Indo-West Pacific Ocean.As with other benthic invertebrate groups restricted to deep water at present, both genera inhabitedshallow environments during the early Cenozoic, and it is no surprise that they occur in Paleocenecarbonates in the eastern sector of the Neuquen Basin. According to the known record, the earliestoccurrence of Delectopecten is in Paleocene rocks of Australia and Patagonia, but this largelyreflects the great scarcity of early Cenozoic fossil localities in the Indo-Pacific region.Key words: Delectopecten, Paravamussium, Pectinoidean, Bivalvia, systematics, Tertiary, Paleocene,Patagonia, Argentina.