Cells solitary, elliptical, with truncate ends in girdle view; apical axis 20–22 µm; cell width (not transapex) 10 µm. Valves asymmetrical about the apical plane; ventral side concave; dorsal side presumably arcuate. Dorsal striae uniseriate, 13–14 in 10 µm; areolae loculate. Ventral striae biseriate, 13–14 in 10 µm; areolae poroid. Girdle bands numerous.
Coastal waters, Plough I., near Davis Station, East Antarctica.
The single cell found in the present study resembles an illustration in Round et al. (1990: 601, fig. l).
Most species of Amphora described from Antarctic waters have been based on early collections. Examination of material (especially by electron microscopy) is required in order to clarify many taxa, while Round et al. (1990) pointed out that the genus itself requires revision. In the present study, only A. racovitzae was identified with certainty. Three other species were also found (types A, B, C), but they remain unidentified.
Van Heurck (1909) listed the following species collected on the “Belgica ” Expedition: A. racovitzae van Heurck, A. angusta var. angustissima van Heurck, A. arcta A.W.F.Schmidt, A. cymbelloides Grunow, A. mexicana var. schmidtiana van Heurck, A. peragallorum van Heurck, A. peragallorum var. robusta van Heurck and A. proteus var. oculata Perag. Hustedt (1958) described A. antarctica (similar to A. cymbelloides) from 69°43’S 06°30’E, off Dronning Maud Land.
Peragallo (1921) listed the following species collected during Charcot’s “Porquoi Pas?” Expedition of 1908–10: A. bongrainii Perag., A. gourdonii Perag., A. charcotii Perag., A. petermannii Perag., A. proteus W.Greg., A. racovitzae van Heurck, A. racovitzae var. minor van Heurck, A. senonquei Perag., A. virgata Østrup, A. virgata var. crassa Perag., A. peragallorum van Heurck, A. turgida W.Greg., A. lanceolata Cleve, A. lanceolata var. aperta Perag., A. lanceolata var. robusta Perag. and A. liouvellei Perag.