The dinoflagellate cyst genus Polygonifera; emendation and taxonomic stabilization

NARESH C. MEHROTRA; WILLIAM A. S. SARJEANT

doi:10.1144/jm.3.1.43

Abstract

The taxonomic identity of the dinoflagellate cyst genus Polygonifera Habib, 1972 is confirmed, through the recognition of additional morphological characters during the study of specimens from Early-Middle Cretaceous sediments of India. A revised definition of this genus is presented. Leberidocysta Stover & Evitt, 1978 is considered a subjective junior synonym of Polygonifera and its type species Leberidocysta (ex: Hexagonifera) chlamydata (Cookson & Eisenack) is transferred to Polygonifera. The other species placed in Leberidocysta are provisionally reattributed to other genera, becoming Craspedodinium (ex: Hexagonifera) defloccata (Davey), Craspedodinium (ex: Palaeostomocystis) pergamentacea (Burger), Hexagonifera laticaudata Vozzhennikova and Hexagonifera scabrata Jain & Taugourdeau-Lantz. A new species, Polygonifera eisenackii, is described. Morphological differences between the camocavate genera Polygonifera and Dingodinium are clarified.

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