Morphology and taxonomy of six marine sand-dwelling Amphidiniopsis species (Dinophyceae, Peridiniales), four of them new, from the German Bight, North Sea
2000
Hoppenrath, Mona
Six marine species, four of them new, of the dinoflagellate Amphidiniopsis are described from intertidal sand. Amphidiniopsis hirsutum (Balech) Dodge has the plate formula Po 4′ 2a 7″ 8c 4s? 5′″ 2″″. The first scanning electron microscopy observations of Amphidiniopsis swedmarkii (Balech) Dodge are reported and the plate formula Po 4′ la 7″ 6c? 5s? 5′″ 2″″ is established. Amphidiniopsis arenaria Hoppenrath sp. nov. is flattened laterally with a cell size of 30.0–43.5 μm (37.8 ± 4.3 μm, mean ± s) long and 27.0–38.2 μm (33.8 ± 4.5) wide (dorsoventrally). The plate formula is Po 4′ 3a 7″ 6c? 4s? 5′″ 2″″. Amphidiniopsis dentata Hoppenrath sp. nov. is flattened laterally, 38.8–46.5 μm (43.0 ± 2.6) long and 33.7–38.8 μm (37.3 ± 1.7) wide (dorsoventrally). The plate formula is Po 4′ 3a 8″ 6c? 3s? 5′″ 2″″. Amphidiniopsis galericulata Hoppenrath sp. nov. is flattened laterally, 20.3–29.0 μm (24.9 ± 2.5) long and 18.0–25.4 μm (21.9 ± 2.7) wide (dorsoventrally). The plate formula is Po 4′ 3a 7(6)″ ?c 3s? 5′″ (lp) 2″″. Amphidiniopsis cristata Hoppenrath sp. nov. is flattened dorsoventrally, 23.1–34.0 μm (28.9 ± 3.9) long and 19.4–28.6 μm (23.6 ± 2.7) wide (laterally). The plate formula is Po 4′ la 6″ 4c? 4s? 6′″ 2″″. All species have a slightly ascending cingulum.
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