358 Neogene Paleontology of the Northern Dominican Republic 20

358 Neogene Paleontology of the Northern Dominican Republic 20

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Neogene Paleontology of the Northern Dominican Republic: 20. Holoplanktonic mollusks (Gastropoda: Heteropoda and Thecosomata) - BAP #358

Holoplanktonic gastropod faunas from the northern Dominican Republic Neogene, contained in the collections of the Natural History Museum at Basel (Switzerland) comprise two species of Heteropoda: Atlanta cordiformis Gabb, 1873 and Protatlanta rotundata (Gabb, 1873), and 17 euthecosomatous pteropods: Limacina (Striolomacina) imitans (Gabb, 1873), L. (Striolimacina) inflata (d'Orbigny, 1836), Limacina sp. indet., Creseis acicula (Rang, 1828), Hyalocylis striata (Rang, 1828), Styioloa subula (Quoy and Gaimard, 1827), Cuvierina astesana (Rang, 1829)?, Cuvierina sp., Clio cuspidata (Bosc, 1802)?, C. pyramidata Linne, 1767, forma lanceolata (Lesueur, 1813), Clio sp., Cavolinia gypsorum (Bellardi, 1873), C. aff. C. gypsorum, C. mexicana (Collins, 1934), C. cf. tridentata (Niebuhr, 1775), Diacria trispinosa (de Blainville, 1821), and Edithinella sp. Edinthinella undulata (Gabb, 1873), recorded in the literature from the same area but not represented in the present collection, is included on the basis of the type material. The number of holoplanktonic gastropod species from the Dominican Republic is thus 20.
  

The name Striolimacina is introduced to replace Planorbella Gabb, 1973a non Haldemann, 1843 (Mollusca).

From the Baitoa Formation (Rio Yaque del Norte section), of assumed late Early Miocene age, a single pteropod (Edinthinella sp.) was recorded. The Late Miocene Cercado Formation (Rio Gurabo: Globorotalia humerosa Zone, Rio Cana; no biozone indicated) and some samples lacking lithostratigraphical data, of ? Late Miocene age (Rio Mao) yielded nine species, among which only Cavolinia gypsorum is indicative of a Late Miocene (Tortonian-Messinian) age. Other species are known only locally or have longer ranges.

Specimens from the late Early Pliocene Gurabo Formation (Globorotalia margaritae Zone; Rio Gurabo) and the Mao Adentro Limestone (G. margaritae Zone; Rio Cana), the Early to middle Pliocene Mao Formation (G. margaritae/miocenica Zone; Rio Gurabo section), and a sample lacking lithostratigraphical data, of ?late Early Pliocene age (Rio Yaque del Norte section) yielded 10 holoplanktonic mollusk species. So far as they could be identified to species these invariably belong to taxa ranging at least through the entire Pliocene, and still occur today.

 

A.W. Janssen

Pages: 40, 3 text-figs., 3 tables

Issue: BAP 358

Year published: 1999

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