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Athersuch, Horne & Whittaker, 1983

Description:
Carapace large, 0.75-0.8 mm long, strongly inflated, greatest width a little behind mid-length. Dorsal margin straight. Posterior margin smooth. Greatest height well behind mid-length. Dorsomedian sulcus weak. Distal process of male copulatory appendage relatively long, with a convex anterior margin and an almost straight posterior margin (B. zetlandica 4 ).

Habitat:
Sublittoral.

Remarks:
B. zetlandica was formerly confused with B. constricta Sars, which does not live in British waters (Athersuch, Horne & Whittaker, 1983) See also remarks on B. intermedia).

Distribution:
British coasts, particularly in the north.

Bythocythere zetlandica