Schornikov, E. I.; Keyser, D. (2004). The morphology and classification of Paradoxostomatinae (Ostracoda) from the nearshore zone of Madeira and the Canary Islands. Revista Española de Micropaleontología. 36(1): 57-81.

199559

Schornikov, E. I.; Keyser, D.

2004

36(1): 57-81

Publication

From a total of 50 ostracod species in the nearshore zone of Madeira and the Canary Islands, twelve belong the subfamily Paradoxostomatinae Brady & Norman, 1889 emend. Schornikov, 1993. For the first time a clear definition of the genus Paradoxostoma Fischer s. s. is given and the type species P. dispar redescribed and fully illustrated. Fifteen nov. comb. are proposed and two nov. syn.: Paradoxostoma insigne Hartmann, 1959 = Paradoxostoma sarniense Brady, 1868 and Paradoxostoma lunatum Okubo, 1977 = Pontostoma honssuense (Schornikov, 1975) are established. "Paradoxostoma" planum Muller, 1894 is provisionally placed in Paradoxostoma s. 1. as details of the soft parts are unknown. Morphological details of five new genera and nine new species are provided: Paradoxostoma wirtzi sp. nov., Lanceostoma gen. nov. with Lanceostoma tenerifense sp. nov.; Calcarostoma gen. nov. with Calcarostoma calcaratum Schornikov & Wouters sp. nov.; Bradystoma gen. nov. with Bradystoma bradyforme sp. nov.; Pontostoma gen. nov. with Pontostoma paraponticum sp. nov., Pontostoma atlanticum sp. nov.; Triangulostoma gen. nov. with Triangulostoma madeirense sp. nov.; Brunneostoma littorale sp. nov. and Brunneostoma cuneatum sp. nov. The differences, on which the discrimination of genera in the Paradoxostomatinae is based, are of the same scale as those used to distinguish genera in other Cytherocopina families. Diagnostic characters include shape and expression of sexual dimorphism of the shell, structure of the fused zone, muscle scar patterns, hinge and penis. The appendages of different genera vary in the degree of reduction of various parts of the antenna, mandible, and maxillula.

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