Marcus E 1950 (citation)- Type species. from muddy sand, samll acoels, cilia beat synchronously in a spiral. description and illustration p 11-12, 102, 10. Marcus E 1951 (citation)- says this is smallest acoel- 0.35 mm (also Haploposthia microphoca 0.3 mm and Rosmarium evelinae 0.2 mm). Marcus E 1952 (citation)- distinguishes from belca by nuclei being sunken in this species. p 10, 11, 102, 103. Dorjes J 1968 (citation)- lists as type. Dorjes J, Karling TG 1975 (citation)- Swedish Museum of Natural History, Brazil. specimen difficult to observe, closely related to Afronta Hyman.
Marcus E 1950 (citation) pg. 102 - "Kuma, a new genus of the Haploposthiidae, with the type K. brevicauda, n. sp. Fig. 10-13) in sand with mud from Cananea, southern coast of the State of Sao Paulo, was found in salinity inferior to that of the open sea. Colour-glands are absent (against Haploposthia); the frontal glands (f) are strongly developed and nearly concentrated (against Afronta); the male antrum is short, bulbous and without penis (against Paranaperus) or cuticular rods (against Paraproporous). Childia has two penes. The living adult worms of K. brevicauda are 0.35 mm long. The nuclei of the epicytium (Fig. 13, w) in the pre-oral part of the body are depressed. The cutaneous muscles (m, y) are disposed as in most Acoela; the parenchymatic muscles (h) are well developed. Mucous glands (u) are scarce; rhabdites absent. The ectocytium is narrow (k), but with many nuclei. The endocytium (i) has peripherical nuclei and is vacuolized, specially in the caudal region, where it leaves a big vacuole (j). It contains Diatoms and Ciliates. The mouth (b) lies a little before the middle and has strong divaricators (g). The ovaries (o) are anterior to the testes (t). The cells of the atrial walls (a) are high."
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