RICHNESS AND PALAEO-ZOOGEOGRAPHICAL SIGNIFICANCE OF THE BENTHIC OSTRACODA (CRUSTACEA) FROM THE OCEANIC ISLAND OF TRINDADE AND ROCAS ATOLL, BRAZIL
Por:
Coimbra J.C., Carreno, AL
Publicada:
1 may 2012
Categoría:
Paleontology
Resumen:
Twenty-one ostracode species from Trindade Island and 23 species from Rocas Atoll are herein recorded. The collective fauna shows low richness and low abundance compared with other oceanic islands. Nevertheless, the presence of tropical pandemic species such as Kotarocythere inconspicua (Brady) and Triebelina sertata Triebel, of the almost exclusively Pacific genus Australimoosella, the Atlanto-Caribbean taxa such as Glyptobairdia coronata (Brady) and Caudites obliquecostatus Bold, together with species typical of the Brazilian shelf, reveals a mixed fauna likely influenced by dispersal of shallow-water taxa between seamounts during Quaternary sea-level lowstands. In contrast to other oceanic islands, endemic ostracode taxa are apparently absent in these two islands. Tenedocythere trindadensis sp. nov., a species also recorded on the Brazilian equatorial shelf, is described and illustrated.
Filiaciones:
Coimbra J.C.:
Instituto de Geociências, UFRGS, Av. Bento Gonçalves, 9500, Cx. 15001, 91501-970, Porto Alegre, RS, Brazil
Carreno, AL:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Bronze
|