Subgenus (Monoplax) S. Thang, C. Tsi & K. Li, 1960

(3-4-3-2-1-1-2-32-5-0-0-0-0)
[see also as Genus under Subfamily: PHOLADINAE]

acutithyra S. Thang, C. Tsi & K. Li, 1960
(3-4-3-2-1-1-2-32-5-1-0-0-0)
[=Penitella kamakurensis (M. Yokoyama, 1922)]
Ref. Bernard, 1983 p 61

dolichothyra S. Thang, C. Tsi & K. Li, 1960
(3-4-3-2-1-1-2-32-5-2-0-0-0)
[=Penitella kamakurensis (M. Yokoyama, 1922)]
Ref. Bernard, 1983 p 61