Convolutidae oblong in shape, with caudal lappets; coloration and patter due to symbiotic algae and concrement granules; rhabdoids, statocyst and statolith may be present; with eyes; brain insunk; frontal organ absent; mouth ventral in mid-body; ovary and testes paired; male genital pore ventral in posterior third of body; muscular penis surrounded by seminal vesicle; female genital pore anterior to male pore; female antrum ciliated; bursa T-shaped and bilobed, each lobe with two or more tubular bursal canals; in mature specimens a copulatory canal (cf. Laurer's canal) may be present dorsally opening into female antrum. Type species: Heterochaerus australis Haswell, 1905[From Winsor L (1990): 794]
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