Prevalence and Intensity of Pseudodelphis oligocotti n. gen., n. sp. (Dracunculoidea; Guyanemidae) in the Tidepool Sculpin, Oligocottus maculosus (Scorpaeniformes; Cottidae)

Abstract

Pseudodelphis oligocotti n. gen., n. sp. (Dracunculoidea; Guyanemidae) is described from the tidepool sculpin, Oligocottus maculosus (Scorpaeniformes; Cottidae), from various localities in coastal British Columbia. The species is placed in Guyanemidae because of its reduced buccal capsule, divided esophagus, functional vulva, and single ovary. It is distinguished from Guyanema, the only other genus in the family, by the absence of caudal alae and the arrangement of caudal papillae in the male. Females of the new genus are distinguished from those of Guyanema by the presence of a blind uterine diverticulum, without associated oviduct and ovary, extending anteriorly from the junction of the posterior uterus and vagina, and a more posteriorly positioned vulva. Fish were sampled every 2 wk throughout 1988. Worms were overdispersed in the host population. Prevalence and mean intensity of infection were highest from February to March.

Guide to the Parasites of Fishes of Canada Part V: Nematoda

“…As presently defined Guyanemidae consists of two genera, namely, Guyanema Petter, 1975, andPseudodelphis Adamson &Roth, 1990. Only Pseudodelphis has been recorded from Canadian fishes.…”

“…Narrow, thin-walled vagina extending anteriorly from uterus along most of length of oesophageal gland; ovijector oval in shape. Site: swim bladder Host: Anguilla rostrata Distribution: Atlantic, Nova Scotia Records: (NS); Marcogliese & Cone 1998 (AT) Family GUYANEMIDAE Petter, 1975 Family diagnosis (after Petter 1975, andRoth 1990). Head with four cephalic papillae, and four internal and four external labial papillae.…”

“…female, vaginal region, lateral view-arrow indicates anterior extremity of uterine diverticulum. (Redrawn from Adamson & Roth 1990) Pseudodelphis oligotti, Adamson & Roth 1990 Description of P. oligocotti (after Adamson & Roth 1990). With characteristics of the genus.…”

“…male, posterior end, lateral view. (Redrawn from Moravec 2013) Pseudodelphis Adamson & Roth, 1990 Generic diagnosis (after Adamson & Roth 1990). Guyanemidae.…”

Histodytes microocellatus gen. et sp. nov. (Dracunculoidea: Guyanemidae), a parasite of Raja microocellata on the European Atlantic coast (north-western Spain)

“…The families Skrjabinallidae, Lucionematidae and Daniconematidae, by contrast, have a restricted Palearctic distribution. The three known genera of the family Guyanemidae (eight species in total) have a scattered distribution in freshwater and marine fishes in rivers and along the coasts of North and South America (Petter 1974(Petter , 1987Adamson and Roth 1990;Martins de Arau´jo Costa et al 1991;Moravec et al 1996).…”