Genus Longimactra Finlay, 1928

(3-4-4-0-21-3-2-38-0-0-0-0-0)
Ref. Vokes, 1980 p 135
[see also as Subgenus under Genus Mactra]

elongata
(3-4-4-0-21-3-2-38-0-1-0-0-0)
Long Trough Shell
Ref. Penniket, 1970 p 100 c