A revision of Helicometra Odhner, 1902 and related genera (Trematoda: Opecoelidae), including a description of Neohelicometra sebastis n. sp.

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Abstract
The genera Helicometra Odhner, 1902, Neohelicometra Siddiqi and Cable, 1960, Stenopera Manter, 1933, and Allostenopera Baeva, 1968 are reviewed and the species therein evaluated in consideration of pronounced morphological variations in H. pulchella (Rudolphi, 1819) Odhner, 1902 and other species of these genera. Species possessing a terminal, funnel-shaped oral sucker are transferred to Neohelicometra. Stenopera and Allostenopera are considered invalid. New synonyms include: H. hypodytis Yamaguti, 1934; H. dochmosorchis Manter and Pritchard, 1960; H. aposinuata Pritchard, 1966; H. upapalu Yamaguti, 1970 = H. pulchella; H. neosebastodis Crowcroft, 1947 = H. tenuifolia Woolcock, 1935; H. boseli Nagaty, 1956 = H. equilata (Manter, 1933) Siddiqi and Cable, 1960; H. rectisaccus (Fischthal and Kuntz, 1964) Fischthal and Kuntz, 1965 = H. nasae Nagaty and Abdel Aal, 1962; and H. pugetensis Schell, 1973 = N. pleurogrammi (Baeva, 1968) n. comb. Neohelicometra sebastis n. sp. is described from various species of rockfishes (Sebastes) from the northeastern Pacific. The other species of the genus, Neohelicometra antarcticae (Holloway and Bier, 1968) n. comb; N. pleurogrammi (Baeva, 1968) n. comb.; N. insolita (Polyansky, 1955) n. comb.; and N. scorpaenae Siddiqi and Cable, 1960, possess a cirrus sac which does not extend posterior to the acetabulum, whereas that of N. sebastis normally extends to the miduterine level. A key to the species of Helicometra and Neohelicometra is included.

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