Description d’un nouveau genre de Benthimermithidae (Nematoda) présentant des utérus munis de glandes annexes

Abstract

RÉSUMÉ. Description de femelles juvéniles appartenant à un nouveau genre et une nouvelle espèce de la famille des Benthimermithidae, Adenodelphis eurythenes n. g., n. sp., parasites de la cavité générale de l'Amphipode Eurythenes gryllus dans les sédiments abyssaux de la Mer de Norvège. Le genre est caractérisé principalement par la présence de glandes annexes échelonnées le long du tiers proximal des utérus.Description of a new genus of Benthimermithidae (Nematoda) with unusual uterine glands. Ces Nématodes sont repliés dans la cavité générale de l'Amphipode, entourant le tube digestif ; la plupart des Amphipodes ne sont parasités que par un seul Néma tode, mais certains en possèdent plusieurs et l'un d'entre eux en contenait 8.Il s'agit uniquement de femelles juvéniles appartenant à la famille des Benthi mermithidae, mais qui présentent quelques structures tout à fait particulières que nous décrivons ici.

7.1 Order Benthimermithida Tchesunov, 1995

“…Early juvenile parasitic stages possess a narrow mouth opening, a short, probably protrusible, stylet and a nonmuscular pharynx devoid of an internal lumen, slightly demarcated from surrounding tissues and bearing a single large, extensive, coarse-grained dorsal gland (Petter 1983a, Chesunov 1997, Tchesunov & Rozenberg 2011. For this reason, it is presumed that the parasitic stages absorb nutrients through the body surface, whereas a stylet with an associated gland is possibly used for penetrating into the internal organs of a host.…”

“…Parasitizing specimens of this species were found in five species of differ ent crustaceans (isopods, amphipods, tananaids and ostracods), and crustacean specimens containing nematodes showed no indication of parasitic castration. with 38 species; Adenodelphis Petter, 1983(Petter 1983a with one species; and Bathynema Miljutin & Miljutina, 2009 with one species. Females were much more numerous than males.…”

The genus Trophomera Rubtsov & Platonova, 1974 with description of T. litoralis sp. n. (Nematoda: Benthimermithidae) from the tidal zone of the Kuril Archipelago and proposal of Benthimermis Petter, 1980 as a junior synonym

“…In only two nominal species are both sexes known (Petter, 1983a;Miljutin, 2004). Unidentifiable early juvenile stages have been found in the body cavity of marine free-living nematodes, polychaetes, priapulids, various crustaceans and holothuroids (Hope, 1977;Petter, , 1983bRubtsov, 1980;Petter & Gourbault, 1985;Chesunov, 1988aChesunov, , 1997.…”

On the histological anatomy of Benthimermis megala Petter, 1987, a giant nematode from the Norwegian deep-sea (Nematoda: Benthimermithidae)

“…They are known as rare and poorly studied parasites of a wide range of deep-sea benthic invertebrates: polychaetes, priapulids, various crustaceans, holothuroids and even free-living nematodes (Hope, 1977;Petter, , 1983bRubzov, 1980;Chesunov, 1988). As in fresh-water and soil mermithids (Mermithida), the larval stages of benthimermithids parasitise the host body cavities and internal organs.…”