Morphology of Protogonyaulax tamarensis (Lebour) Taylor and Protogonyaulax catenella (Whedon and Kofoid) Taylor from Japanese coastal waters
Abstract:Morphological characteristics of two toxic Protogonyaulax species, P. tamarensis and P. catenella, were observed to clarify taxonomic identification difficulties. Obvious differences were found in three characters: shape of an apical pore plate, presence or absence of a ventral pore, and position of a posterior attachment pore. Protogonyaulax tamarensis had a triangular or rectangular apical pore plate with an apical pore and a round or short ellipsoidal anterior attachment pore. A ventral pore was clearly found on the suture between the first and the fourth apicals. A posterior attachment pore was located near the margin of the sulcal posterior plate. Protogonyaulax catenella had a dorsally wide triangular apical pore plate with a slightly smaller apical pore and an ellipsoidal anterior attachment pore. No ventral pore was found. A posterior attachment pore was located in the right half of the sulcal posterior plate. Both attachment pores of these species were sealed up when the cell stopped forming a chain and swam individually. Both species are distributed in many bays over a wide area of Japanese coastal waters, but in general P. tamarensis occurred in the north, and P. catenella in the south. Sometimes both species occurred in the same bay. Their resting cysts were collected in some of the bays where the planktonic forms were observed.
Document Type: Research Article
Publication date: 1985-09-01
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