Redescription of Diclidophora nezumiae (Monogenea: Diclidophoridae) from Nezumia bairdi (Macrouridae), from the Gulf of St. Lawrence

Abstract

Diclidophora nezumiae Munroe, Campbell, and Zwerner, 1981 is redescribed from the common grenadier, Nezumia bairdi (Macrouridae), in the Gulf of St. Lawrence. A prostatic vesicle is present in the terminal male genitalia. A complete lamellate extension attached to peripheral sclerite c1, is present in the clamp anterior jaw of Diclidophora nezumiae. Variability in the appearance of the clamp of Diclidophora nezumiae is presented.

Revision of the genus Diclidophora Krøyer, 1838 (Monogenea: Diclidophoridae), with the proposal of Macrouridophora n. g.

“…is chosen as the typespecies. (see Rubec, 1991b) and in five other species herein re-assigned to the genus Macrouridophora n. g.: M. paracoelorhynchi (Mamaev & Paruchin, 1979) n. comb., M. coelorhynchi (Robinson, 1961) n.…”

“…and M. nezumiae (Munroe, Campbell & Zwerner, 1981) n. comb. Variability in the appearance of the lamellate extension, symphysis between sclerites a3, c3 and the suctorial apparatus in the clamps of all species re-assigned to Macrouridophora n. g. was adequately described and represented by Rubec (1991b), and cannot be used as characteristics of specific importance. comb., M. attenuata (Mamaev & Zubtschenko, 1979) n.…”

“…is the smallest and most abundant species in this genus (see Munroe et al, 1981;Rubec, 1991b). nezumiae n. comb.…”

“…nezumiae n. comb. Egg morphology (in utero) is quite variable, with a broad, curved needle-like appendage at the abopercular end and a short, blunt, recurved hook at the opercular end (paratype USNM 76927) or with appendages reversed at the polar ends (Rubec, 1991b). The body shape is variable, being broadly triangular to elongate, with a broadly expanded unspecialised haptor.…”

“…is the smallest and most abundant species in this genus (see Munroe et al, 1981;Rubec, 1991b). 3, Rubec, 1991b The detailed morphology of prostatic vesicle is difficult to observe in most type-specimens examined.…”