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Family Hallangiidae Westblad, 1949


With well developed frontal organ; anterior mouth and muscular pharynx. Ovary paired (or weakly forked), seminal receptacle and vagina present, female pore before male; testes paired, male organ comprises seminal vesicle and penis (sometimes reduced), male antrum not tubular.

Type genus

Hallangia Westblad, 1946


Aechmalotus Beklemischev, 1915
Hallangia Westblad, 1946


The symbiotic species Aechmalotus is found in the holothurian Eupygrus (see Beklemischev, 1915).

Family Hallangiidae