Contribution to the Dinoflagellate Flora of Ohio

Abstract

Water samples were collected from over 100 sites in Ohio in a survey for dinoflagellates. Whole water and tows were taken from ponds, lakes, and reservoirs. Approximately half the samples contained dinoflagellates and 24 taxa were identified including 13 not previously reported from Ohio. New taxa include Ceratium brachyceros, Peridinium umbonatum, Peridinium volzii, Thompsodinium intermedium, Peridiniopsis cunningtonii, Cystodinedria inermis, Gymnodinium austriacum,G. biemale, andCr. wawrikae. Four of the published forms of. Ceratium hirundinella were recognized including forma silesiacum, forma piburgense, forma scotticum, and forma gracile.