On the freshwater dinoflagellates presently included in the genus Amphidinium, with a description of Prosoaulax gen. nov

TY - JOUR

T1 - On the freshwater dinoflagellates presently included in the genus Amphidinium, with a description of Prosoaulax gen. nov

AU - Calado, A.

AU - Moestrup, Øjvind

PY - 2005

Y1 - 2005

N2 - Amphidinium is a genus of naked dinoflagellates, characterized by a small epicone and a larger hypocone. Presently about 120 species from both freshwater and marine biotopes have been described. The genus has long been known to be poly-phyletic, however, and the recent rediscovery of the type species has now allowed for more precise definition of the genus. The new circumscription of the genus leaves the freshwater species without a generic name. A new generic name, Prosoaulax gen. nov., is therefore proposed for the first described freshwater species, Amphidinium lacustre Stein (1883), and related species. Based on ultrastructural features, notably the very unusual type of eyespot, Prosoaulax is considered to be related to a recently recognized, but poorly understood group of dinoflagellates, comprising the marine species Gymnodinium simplex, G. natalense, Polarella antarctica, and some symbionts of marine invertebrates, G. bei and G. linucheae. It also includes the symbionts of corals (‘zooxanthellae') belonging to the genus Symbiodinium, a genus believed to contain the modern representatives of the Suessiales, an order of dinoflagellates extending back into the Mesozoic

AB - Amphidinium is a genus of naked dinoflagellates, characterized by a small epicone and a larger hypocone. Presently about 120 species from both freshwater and marine biotopes have been described. The genus has long been known to be poly-phyletic, however, and the recent rediscovery of the type species has now allowed for more precise definition of the genus. The new circumscription of the genus leaves the freshwater species without a generic name. A new generic name, Prosoaulax gen. nov., is therefore proposed for the first described freshwater species, Amphidinium lacustre Stein (1883), and related species. Based on ultrastructural features, notably the very unusual type of eyespot, Prosoaulax is considered to be related to a recently recognized, but poorly understood group of dinoflagellates, comprising the marine species Gymnodinium simplex, G. natalense, Polarella antarctica, and some symbionts of marine invertebrates, G. bei and G. linucheae. It also includes the symbionts of corals (‘zooxanthellae') belonging to the genus Symbiodinium, a genus believed to contain the modern representatives of the Suessiales, an order of dinoflagellates extending back into the Mesozoic

U2 - 10.2216/0031-8884(2005)44[112:OTFDPI]2.0.CO;2

DO - 10.2216/0031-8884(2005)44[112:OTFDPI]2.0.CO;2

M3 - Journal article

SN - 0031-8884

VL - 44

SP - 112

EP - 119

JO - Phycologia

JF - Phycologia

IS - 1

ER -