Eudorella bathyalis, Vassilenko, Stella & Tzareva, Ludmila, 2004

Vassilenko, Stella & Tzareva, Ludmila, 2004, New Cumacea species (Malacostraca, Peracarida) from the deepwater area of the Sea of Japan (Collections of the 52 Cruise by the R / V « Vityaz », 1972), Zootaxa 702, pp. 1-16 : 9-13

Eudorella bathyalis sp. nov.

( Figs. 5–6 )

Material examined: holotype: adult female with an empty marsupium, the length is 6.4 mm, kept in the collection of Zoological Institute, ( ZIN ­ 1/88373), R/V “Vityaz”, 52nd cruise, sta. 6650, 08.06.1972; Sea of Japan, 42º35´7´´N, 134º19´E, depth 1760 m, substrate: liquid mud, “SIGSBY” trawl.

Paratypes: ( ZIN ­ 2/88374), 2 females (6.3, 6.8 mm length) with an empty marsupium; 3 females (5.0–6.0 mm length) with rudimentary oostegites; 2 males (6.0– 6.5 mm length) with developed pleopods; 4 males (4.5–5.0 mm length) with rudimentary pleopods; 3 juveniles (2.5–4.0 mm length) — same locality, by “SIGSBY” trawl, ( ZIN ­ 3/88375), 1 female (6.3 mm length) with an empty marsupium — same locality, depth 1840 m, substrate: thick gray clay, bottom sampling grab “Okean”.

Diagnosis: Body slender, smooth without hairs. Sub­rostral notch of complicated shape – with two grooves, upper groove dorsally limited to projection with three denticles, directed forward; this groove separated from lower groove by weakly projected protrusion with three denticles, directed downwards; sub­rostral spine is strong and sharp, dentate on adjoining lower part of carapace.

Description of the holotype: Female. ( Fig. 5 , A). Slender, elongated, smooth body without hairs. Carapace surface sculpture reticulates. Sub­rostral notch of complicated shape — with two grooves: upper groove deeper than lower one; dorsally limited to projection with three denticles, anteriorly directed; grooves separated by weakly projected protrusion with three denticles, directed downwards; sub­rostral spine is strong and sharp, curved downwards and forwards, dentate on adjoining lower part of carapace ( Fig. 5 , D).

Antenna I ( Fig. 5 , C). Length of terminal peduncle article of antenna I considerably smaller than that of main flagellum. Accessory flagellum shorter than the article 1 of main flagellum.

Basis of maxilliped III ( Fig. 6 , A) curved and slightly longer than other five articles combined together, its distal outer angle bearing two long plumose setae, merus bearing one long plumose setae on outer distal angle, length of carpus­dactylus gradually decreasing from carpus five to dactylus, peak of dactylus wide and bearing several setae.

Pereopod I ( Fig. 6 , B) protruding beyond carapace edge almost by length of last three articles; basal article bearing several big plumose setae, length slightly exceeding length of ischium­carpus combined, propodus considerably exceeding carpus one in length and more than twice dactylus.

Pereopod II ( Fig. 5 , B) with rather wide articles, basal article fused with ischium, carpus considerably exceeds length of merus and almost equal to length of propodus and dactylus combined; dactylus not widened, narrower than carpus, distal part bearing several strong distal setae, forming.

Uropodal length ( Fig. 6 , C) considerably exceeding length of last abdominal segment; uropodal peduncle similar in length to exopodite; exopodite shorter than endopodite; terminal article of endopodite short, and less than 1/3 length of article 1, distal end is obtuse, bearing two long setae.

Male immature, similar in appearance to female. Anterior edge of lobes on pseudorostrum of different construction in comparison with that of a female. Antero­lower edge of lobes on pseudorostrum almost vertical, bearing nine denticles ( Fig. 5 , E). Antenna II elongated.

Remarks. Some females from paratypes bear four denticles on the upper protrusion of sub­rostral notch; up to five denticles can be developed on the protrusion between grooves. Females with rudimentary oostegites have weakly developed dents on the sub­rostral notch protrusions ( Fig. 5 , F).

By the form of sub­rostral notch Eudorella bathyalis is slightly similar to Eudorella hispida Sars, 1871 , but sub­rostral projection of bearing another number of denticle than E. hispida , the new species body is not covered with hairs, and its uropods also have a different structure.

Figures

FIGURE 5. Eudorella bathyalis sp. nov. A — adult female, holotype, lateral view; B ­ pereopod II; C — antenna I; D — carapace, anterior part of carapace (adult female); E — anterior part of carapace (male); F— anterior part carapace (juvenile female).

FIGURE 6. Eudorella bathyalis sp. nov. A — maxilliped III; B — pereopod I; C — telson and uropod.