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Original Articles

AMPHORA TUCUMANA SP. NOV., A NEW SPECIES FROM CUMBRES CALCHAQUÍES, TUCUMÁN, ARGENTINA

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Pages 47-54 | Published online: 31 Oct 2011
 

Abstract

Amphora tucumana sp. nov. is described from bottom sediments of the Laguna Nostra (Cumbres Calchaquís, 4300 m altitude, Tucumán province, Argentina). Its valvar structure is described, using LM and SEM. The principal characteristics of the species are its transapical costa-like internal thickenings, the raphe-ledge covered by small and irregular depressions, and its areolae of irregular length. Its relationships are discussed.

Resumen

Se describe Amphora tucumana sp. nov. presente en sedimentos de la Laguna Nostra (Cumbres Calchaquies, 4300 m s.n.m., provincia de Tucumán, Argentina). Se discute la estructura de su valva tal como la revelan los microscopios óptico y de barrido. Los rasgos característicos de esta especie son la presencia de engrosamientos transapicales dorsales ‘tipo costillas’ en el lado interno de la valva, el borde rafidiano cubierto por pequeñas depresiones irregulares y las areolas de longitud variable. Se discute su relación con taxones afines.

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