биота российских вод японского моря - Materials of Alexey Shipunov

exopod with one simple lateral seta. Telson entire, linguiform; or elongate, triangular,with rounded apex.One of three species of this genus is known from the northern part of the Sea ofJapan.1. Paracanthomysis shikhotaniensis Petryashov, 1983(Pl. XVI, figs. 1–7)Petryashov, 1983: 125–128 (Paracanthomysis shikhotaniensis); Takahashi & Murano,1986: 61–65 (Paracanthomysis spadix).Description. In male, outer flagellum of antennule 2 times as broad as inner one,curved horn-like at base; inner flagellum has ordinary form. In females inner flagellumof antennule lanceolate, 2.5 times as broad as outer one, and about 2–2.5 times aslong as peduncle; outer flagellum has ordinary form. Antennal scale 7–12 times aslong as broad (in juveniles 10–12 times as long as broad). Carpo-propodus of endopodof thoracopods 3–8 consists of 4 (in juveniles) to 5–7 subjoints. Tergites of distal thoracicsegment and all abdominal segments smooth, without furrows or spines. Exopodof pleopod 4 of male 2.8 (in young males) to 8.6 times as long as endopod. Ventralside of endopod of uropod, near statocyst, bears 3 (in juveniles) to 4–7 spines. Telsonelongate, linguiform, 2–3.3 times as long as broad at base; spines on distal half of lateralmargin, excluding its apical part, gathered in 3–10 distinct groups; spines on apicalpart of lateral margin almost equal; apex with 2 pairs of spines: inner pair slightlyshorter than outer one, outer spines almost as long as adjacent lateral spines. Maximumlength of females 27.1 mm, of males 22.6 mm.Distribution. P. shikhotaniensis is a West Pacific widespread boreal species, distributedfrom the north-eastern Japan and Possjet Bay (Sea of Japan) to Korf Bay(Bering Sea); no one specimen has been recorded off the northern and western coast ofthe Sea of Okhotsk. In the Sea of Japan it is found in Peter the Great Bay and in theTatar Strait.Habitat and breeding. P. shikhotaniensis is a high sublittoral species; its depthrange is from 0 to 21.5 m. It occurs in waters with a temperature from -1.5° to+22.6°C and a salinity of 30–34‰, over rocks, rarer over boulders and gravel, sand, ormuddy sand. It is most abundant near rocks and capes with strong surf. Females withembryos were recorded in the Sea of Japan for May, July, and August. The number ofembryos ranges from 8 to 54.ReferencesBacescu, M. & L.G. Gleye. 1979. New Mysidacea from the Californian waters // Trav.Mus. Hist. Nat. Grigore Antipa. V. 20. P. 131–141.Banner, A.H. 1948. A taxonomic study of the Mysidacea and Euphausiacea (Crustacea)of the northeastern Pacific. Part II. Mysidacea, from tribe Mysini throughsubfamily Mysidellinae // Trans. Roy. Can. Inst. V. 27. P. 65–124.Banner, A.H. 1954. New records of Mysidacea and Euphausiacea from the northeasternPacific and adjacent areas // Pacif. Sci. V. 8. P. 125–139.Brandt, F. 1851. Th. Middendorffs Riese in den aussersten Norden und Osten Sibiriens// Zoologie. Bd 2, N 1. S. 79–148.62