Answers are grounded in this paper and cite their sources.
Harold E. Wallace, Life History and Embryology of Triganodistomum mutabile (Cort) (Lissorchiidae, Trematoda), Transactions of the American Microscopical Society, Vol. 60, No. 3 (Jul., 1941), pp. 309-326
No takes yet. Share an insight, caveat, or question.
Harold E. Wallace (1941) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: