Key To Species

1 a. Cells in girdle view curved in the middle and nearly straight close to apices

( genuflexed), the two pili of a valve crossing

A. mammifer Hasle, von Stosch, 8c Syvertsen lb. Cells in girdle view evenly curved, the two pili of a valve not crossing. . A. cornucervis Hasle, von Stosch, 8c Syvertsen

Distribution:

A. cornucervis—many records from polar and temperate waters of the northern hemisphere; two records from the South Island, New Zealand. A. mammifer—temperate waters of the North Sea, subtropical habitats along the Texas coast of the Gulf of Mexico.

Genus Brockmanniella Hasle, von Stosch, 8c Syvertsen 1983 Type: Brockmanniella brockmannii (Hustedt) Hasle, von Stosch, 8c Syvertsen.

Monospecific genus.

Brockmanniella brockmannii (Hustedt) Hasle, von Stosch, 8c Syvertsen (Plate 36)

Basionym: Plagiogramma brockmannii Hustedt.

References: Hustedt, 1939, p. 595, Figs. 11 and 12; Drebes, 1974, p. 101, Fig. 82; Hasle et al., 1983, p. 34, Text Fig. 5, Figs. 132-155; Gardner 8c Crawford, 1994, Figs. 30-37. Girdle view: Long, loose, partly twisted ribbons. Cells rectangular, bulging in the middle. Sibling valves abutting in the middle and at the elevations.

Cymatosira lorenziana

Plagiogrammopsis vanheurckii

Cymatosira bélgica

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