Hemicyclops tanakai Itoh and Nishida, 2002

Karanovic, Tomislav & Lee, Wonchoel, 2016, First records of Hemicyclops tanakai Itoh and Nishida, 2002 and Tisbe ensifer Fischer, 1860 (Crustacea, Copepoda) in Korea, Journal of Species Research 5 (3), pp. 289-299 : 290

publication ID	https://doi.org/ 10.12651/JSR.2016.5.3.289
persistent identifier	https://treatment.plazi.org/id/7B2987D4-2811-1C4F-FF43-F8BE8546F8AE
treatment provided by	Felipe
scientific name	Hemicyclops tanakai Itoh and Nishida, 2002
status

Treatment

Hemicyclops tanakai Itoh and Nishida, 2002 View in CoL

( Figs. 1-3 View Fig View Fig View Fig )

Synonymy. Hemicyclops tanakai n. sp. Itoh and Nishida (2002), p. 139, figs. 103; Hemicyclops sp. Itoh (2001),

p. 185, fig. 3C.

Type locality. Japan, Tokyo Bay, estuarine mud-flat on the mouth of the Tama River , mudshrimp burrows in the intertidal zone, 35°32.0′N 139°46.2′E GoogleMaps .

Specimens examined. Two females ( NIBR IV 0000 287266 and NIBR IV 0000287267 View Materials ) dissected on one slide each; allotype male ( NIBR IV 0000287268 View Materials ) dissected on one slide; all collected from Korea, Jeju Island, Sunshine Hotel beach, interstitial, 26 April 2014, leg. T. Karanovic. 33°32.755′N 126°39.753′E GoogleMaps .

Diagnosis. Body length, excluding caudal setae, from 1220 to 1435 μm, male slightly longer than female. Co lour of preserved specimen yellowish ( Fig. 1A View Fig ). Habitus robust, dorsoventrally compressed, with prosome/ urosome ratio about 1.2 and greatest width at posterior end of cephalothorax. Prosome ovoid, about 1.4 times as long as wide, twice as wide as genital somite in male and 2.6 times as wide as genital doublesomite in female. Female urosome ( Fig. 1B View Fig ) gradually tapering posteriorly, genital doublesomite about twice as wide as anal somite; genital doublesomite ( Fig. 1C View Fig ) 1.1 times as long as greatest width, expanded in anterior third. Male genital somite ( Fig. 1A View Fig ) expanded in posterior part, hearthshaped, 0.8 times as long as wide, 2.7 times as wide as anal somite. Caudal rami ( Figs. 1D View Fig , 3A View Fig ) cylindrical, 2.1 times as long as wide. Antennula ( Figs. 1E View Fig , 3B View Fig ) sevensegmented, with fourth segment longest, armature formula in female 4.15.6.3.4 + ae.2 + ae.7 + ae, and with one extra seta on third and fourth segments each in male. Antenna ( Fig. 1E View Fig ) foursegmented, armature formula 1.1.4.7, outer distal corner of third segment projected, fourth segment minute. Labrum ( Fig. 3C View Fig ) trapezoidal, with wide and centrally convex cutting edge and concave sides. Mandibular gnathobase ( Fig. 1F View Fig ) with one smooth spine and three pinnate setae. Maxillula ( Fig. 1F View Fig ) simple cuticular plate with eight setae. Maxilla ( Fig. 1F View Fig ) twosegmented, with two setae on large first segment, and four elements (two setae and two spines) on small second segment. Female maxilliped ( Fig. 2A View Fig ) foursegmented, first and second segment robust, second and third minute, armature formula 2.2.0.5. Male maxilliped ( Fig. 3E View Fig ) prehensile, with narrow and cylindrical first segment, expanded and triangular second segment, and minute third segment armed with large apical claw. All swimming legs ( Fig. 2 View Fig BE) with threesegmented exopods and endopods, endopods about 1.4 times as long as exopods, only first leg with inner basal spine, first exopodal segment with just outer spine, first endopodal segment with just inner seta, second exopodal segment with outer spine and inner seta, second endopodal segment with one (first leg) or two (other legs) inner setae, spine/ seta formula of third exopodal segments 1.2.2.1/7.7.7.7, spine/seta formula of third endopodal segments 1.3.3.3/ 5.3.3.2. Fifth leg ( Figs. 2F View Fig , 3F View Fig ) two-segmented, first segment short with single outer seta, second segment ovoid, about 1.7 times as long as wide, with three spines and one seta.