Spectrarcturus chlebovitschi ( Kussakin, 1972 ) Stransky & Svavarsson & Poore & Kihara, 2020

Stransky, Bente, Svavarsson, Jörundur, Poore, Gary C. B. & Kihara, Terue Cristina, 2020, Revision of Pleuroprion zur Strassen, 1903 (Holidoteidae) and re-evaluation of Spectrarcturus Schultz, 1981 (Arcturidae) (Crustacea, Isopoda, Valvifera), Zootaxa 4894 (1), pp. 1-52 : 35

Spectrarcturus chlebovitschi ( Kussakin, 1972) comb. nov.

( Fig. 26 )

Pleuroprion chlebovitschi Kussakin, 1972: 183–186 , figs 3–4. — Kussakin & Mezhov, 1979: 148.— Kussakin, 1982: 437–440, figs 325–326.

Material examined: Paratype female, ZIN RAS number N 4/59458, R / V “PT-2”, station 56, 26 May 1955, Sea of Okhotsk , Aniva Bay .

Diagnosis: Body with numerous large and small pointed tubercles, sometimes strongly bulbous at apex, forming row across each pereonite; three rows on pereonite 4. Pereonite 4 0.2 times body length; subparalell, 2 times longer than third pereonite. Pleotelson short, wide, bluntly truncated, slightly convex apically; anteriorly two pairs of middorsal spines, posteriorly with dense low tubercles; lateral margins extended to rounded projections, one mid-laterally and one near apex. Antennula short, reaching to distal end of second peduncular segment of antenna; first article dorsally with large spine. Antenna robust and intermediate in length, about 0.7 of total body length; pronounced rounded spines laterodorsally on second segment, two rounded spines on third segment. Spines on basis of pereopods 5 to 7.

Remarks: The female was thoroughly described and illustrated by Kussakin (1972, 1982), but he did not illustrate the male. He stated that the male is smaller and more slender, and not expanded in the middle pereonites ( Kussakin 1972).

There is considerable variation in the form of the spines on the body, these being either thick, robust and blunt, or rounded, with bulbous tip (see Kussakin 1972: fig. 3). These extremes can even occur on the same specimens ( Kussakin 1972).

The species can be distinguished from all other Spectrarcturus species on the shape of the dorsal spines/tubercles and on the robust antenna.

Distribution: Kurile Islands, at depths between 6 and 65 m ( Kussakin 1982).

Figures

FIGURE 26. Spectrarcturus chlebovitschi (Kussakin, 1972). Female paratype. A, habitus, dorsal view; B, habitus, lateral view. Scale: a = 1 mm (A, B).