Hatschekia fukurubi Uyeno & Nagasawa, 2010, n. sp.
Creators: name: Uyeno, Daisuke
name: Nagasawa, Kazuya
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Siphonostomatoida
Hatschekiidae
Hatschekia
Hatschekia fukurubi

description: Hatschekia fukurubi n. sp.
(Figs 91–105)
Type material. Holotype, female (NSMT –Cr 20911), ex Balistapus undulatus (Park) (Tetraodontiformes: Balistidae), off Cape Zanpa (26°26’N, 127°42’E), Okinawa-jima Island, the Ryukyu Islands, East China Sea, Japan, 7 April 2007. Paratype: 1 female (RUMF –ZC–00927), ex B. undulatus, off Cape Zanpa (26°26’N, 127°42’E), Okinawa-jima Island, the Ryukyu Islands, East China Sea, Japan, 7 April 2007.
Description of female. Body (Figs 91–93) 1270–1400 (1335 ± 92) long, excluding caudal rami (n = 2). Cephalothorax nearly round with 2 protrusions on frontal margin, shorter than wide [221–240 (230 ± 14) × 270–291 (280 ± 15)], with dorsal, chitinous. trichotomous frame with lateral ends branched, plus a pair of short, independent outward-curved frames. Trunk sausage-shaped, longer than wide [1117–1167 (1142 ± 36) × 267–291 (279 ±17)] bearing 2 anterior processes. Urosome (Fig. 94) excluding caudal ramus shorter than wide [26–36 (31 ± 7) × 77–91 (84 ± 10)]. Genital complex fused to abdomen without border. Caudal ramus (Fig. 94) slightly longer than wide [17–22 (20 ± 3) ×8–10 (9 ± 1)], bearing 6 naked setae.
Rostrum not expanded anteriorly. Antennule (Fig. 95) indistinctly 5-segmented, 101–110 (106 ± 7) long; armature formula: 9, 5, 4, 1, 13 + 1 aesthetasc; knobs settled on proximal and second segments. Antenna (Fig. 96) 3-segmented; proximal segment (coxa) unarmed; middle segment (basis) ornamented with surface pits; terminal claw with thick, basal processes; proximal segment length 23–25 (24 ± 1); middle segment length 55–76 (65 ± 14); terminal claw length 21–23 (22 ± 2); total length 103–119 (111 ± 12). Parabasal papilla not observed. Oral cone robust. Mandible (Fig. 97) slender, with 4 sharp apical teeth. Maxillule (Fig. 98) bilobate; both lobes armed with 2 tapering elements. Maxilla (Fig. 99) 4-segmented; proximal segment unarmed; second segment rod-like, with 1 basal seta; third segment elongate, with 1 distal seta; terminal segment small, with 1 small seta and bifid claw. Maxilliped absent.
Legs 1 and 2 (Figs 100–101) biramous; leg 1 with exopod composed of 2 incompletely fused segments and 1-segmented endopod; leg 2 with 2 indistinct exopod segments and 2-segmented endopod; leg armature formula as follows:
Leg 1 (Fig. 100) 44–61 (53 ± 13) long; protopod length 14–28 (21 ± 10); exopod length 15–24 (20 ± 6); endopod length 18 (18 ± 0). Leg 2 (Fig. 101) length 69–73 (71 ± 3); protopod length 45–47 (46 ± 1); exopod length 24–26 (25 ± 2); endopod length 21–29 (25 ± 6).
Intercoxal sclerites of legs 1 and 2 (Figs 102–103) bearing 2 processes.
Leg 3 (Fig. 104) represented by 2 simple setae originating on mid-lateral surface of trunk. Leg 4 (Fig. 105) represented by 1 simple lateral seta on posterior ¾ of trunk.
Attachment site. Gill filaments.
Remarks. Of 108 species in Hatschekia, 23 species have processes on the intercoxal sclerites of legs 1 and 2. Hatschekia fukurubi n. sp., H. oblonga Wilson, 1913 and H. quadrabdominalis Yü, 1933 all have two processes on the intercoxal sclerites,. However, the new species distinctly differs from the other two congeners by having anterior processes on the trunk.
Etymology. The specific name of the new species, fukurubi, is a local name of the type host, Balistapus undulatus, in Okinawa.
description: Published as part of Uyeno, Daisuke & Nagasawa, Kazuya, 2010, The copepod genus Hatschekia Poche, 1902 (Siphonostomatoida: Hatschekiidae) from triggerfishes (Pisces: Tetraodontiformes: Balistidae) from off the Ryukyu Islands, Japan, with descriptions of eleven new species, pp. 1-40 in Zootaxa 2478 on pages 21-24, DOI: 10.5281/zenodo.195334