Plate 1 issued from : M.S. Kos in Crustaceana, 1972, 23 (2). [p.114, Fig.1].
Female (Izmena bay, Kunashir Island): A-B, habitus (dorsal and lateral, respectively).
Nota: Head and Th1 fused, 4th and 5th fused.
Last thoracic segment asymmetrical, the right side more elongated, extending to the middle of the genital segment; the distal corner of the segment widely rounded in lateral view.
Rostal prominence low, without filaments.
Urasome 4-segmented, its length is less than 1/3 of the cephalothorax.
Genital segment swollen on the left lateral margin.
Caudal rami symmetrical, with 4 strong and 1 small setae, the innermost seta arises separately from the distal margin of the ramus.

Plate 2 issued from : M.S. Kos in Crustaceana, 1972, 23 (2). [p.115, Fig.2].
Female: A, A1; B, A2; C, Md; D, Mx1; E, Mx2; F, Mxp; G-J, P1 to P4; K, P5.
Nota: A1 symmetrical, 24-segmented, reaching almost the proximal margin of the genital segment.
A2 with protopod 2-segmented; exopod longer than the endopod; exopod 5-segmented with 3 terminal setae and 6 setae along the inner edge; endopod 2-segmentd, last segment with 6 terminal setae.
Denticulate orocess of Md with 9 teeth; basipod with 4 strong setae along the inner edge; exopod 4-segmented with 6 setae; endopod 2-segmented, its 1st segment with a few setae, 2nd segment with 8 terminal setae.
P5 symmetrical, 3-segmented; terminal segment short and broad basally, its slightly narrows distally, the external distal edge is strongly serrate, at its base it carries a short, thick, strongly serrate process, which tapers apically.

Plate 3 issued from : M.S. Kos in Crustaceana, 1972, 23 (2). [p.116, Fig.3].
Male: A-B, habitus (dorsal and lateral, respectively); C, P5.
Nota: Mouth parts and swimming legs as in female.
Right leg of P5 long and slender, 4-segmented, 3th segment very slender and long, it bears 1 small outside spine; last segment claw-like and carries 2 processes on the inner proximal margin; left leg 5-segmented, the penultimate segment is the largest and the most massive, it has a complex cristate formation; the terminal segment carries a number of plates and cristate formations in a complex arrangement.

Plate 4 Issued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179. [p.20, Fig.5]. Stephos kurilensis female and male.

Plate 5 Issued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179. [p.21, Fig.6]. Stephos kurilensis female.
Note the teeth of the edge of Md and P2.

Plate 6 Issued from : M.S. Kos in Zoological Institut RAS, St. Petersburg, 2016, 179. [p.22, Fig.7]. Stephos kurilensis female: P1, P2 and P4.