Ref ID : 4247
M. Beatriz Borgese; Two Armored Dinoflagellates from the Southwestern Atlantic Ocean: A New Species of Protoperidinium and a First Record and Redescription for Gonyaulax alaskensis Kofoid. J.Protozool. 34(3):332-337, 1987
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This paper describes a new armored dinoflagellate, Protoperidinium dolichoporum, and updates the description of Gonyaulax alaskensis Kofoid, 1911, both from the southwestern Atlantic Ocean. The distinguishing characteristics of P. dolichoporum are the following: the globular-pentagonal shape, a pore plate extending onto the dorsal surface, a second anterior intercalary five-sided plate in contact with the fourth and fifth precingular plates, and an unusual body sculpture of irregular rounded papillae with 1-3 pores on the top of each. Although in general similar, this new species differs in a significant number of details from other members of the Avellana group. The original thecal formula of G. alaskensis given by Kofoid in 1911 is revised with respect with to the epithecal plate pattern and the sulcal region is now described in detail. This is the first record of G. alaskensis in the southwestern Atlantic Ocean.