REDESCRIPTION OF TWO ANTARCTIC SPECIES OF CUSPIDARIA: C. CONCENTRICA THIELE, 1912 AND C. MINIMA (EGOROVA, 1993)

ZELAYA, D. G.; ITUARTE, C.

The Veliger

California Malacozoological Society

Año: 2006 vol. 48 p. 170 - 177

0042-3211

Cuspidaria concentrica Thiele, 1912 , frequently reported as a synonym of Cuspidaria kerguelensis Smith, 1885, is re-described and revalidated following the study of new materials from South Georgia Islands; this constitutes the first record of its presence in the Scotia Sea.  The more elongated shell outline of C. concentrica and the smaller number of elevated lamellar concentric ridges clearly separate it from C. kerguelensis.  Cuspidaria minima (Egorova, 1993), a species known from East Antarctica and South Orkneys Islands, is re-described based upon material from the Elephant Islands.  C. minima is characterized by a small shell with a globose disc strikingly separated from the short rostrum, and a shell surface with high, lamellated, upwardly bent commarginal ridges.  Anatomical data mainly from septal musculature of both species, are given.  Type specimens of Cuspidaria tenella Smith, 1907, Cuspidaria plicata Thiele, 1912 and Cuspidaria infelix Thiele, 1912 are refigured and the reports on the presence of C. kerguelensis in the Scotia Arc Islands are discussed