Hatschekia zanpa, Uyeno, Daisuke & Nagasawa, Kazuya, 2010

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, Zootaxa 2478, pp. 1-40 : 19

Hatschekia zanpa n. sp.

( Figs 76–90 )

Type material. Holotype, female ( NSMT –Cr 20909), 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. Paratypes: 1 female ( RUMF –ZC–00926), 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; 6 females ( NSMT –Cr 20910), ex B. undulatus , off Chatan (26°19’N, 127°44’E), Okinawa-jima Island, the Ryukyu Islands, East China Sea, Japan, 19 July 2007.

Description of female. Body ( Fig. 76 ) 485–546 (516 ± 19) long, excluding caudal rami (n = 8). Cephalothorax round, slightly shorter than wide [152–180 (161 ± 9) × 169–209 (186 ± 13)], widest in middle, with dorsal, T-shaped chitinous frame and 2 additional independent, short frames; bearing irregular protrusions on lateral margins. Trunk elongated, longer than wide [334–374 (354 ± 13) × 126–145 (134 ± 7)], ornamented with scale-like structures ( Fig. 77 ). Genital complex distinctly separated from abdomen ( Fig. 78 ). Urosome excluding caudal ramus as long as wide [43–58 (51 ± 5) × 53–58 (51 ± 5)]. Caudal ramus ( Fig. 78 ) slightly longer than wide [21–30 (25 ± 3) ×13–17 (15 ± 1)], bearing 5 naked setae.

Rostrum with 1 digitiform process at each posterolateral corner ( Fig. 79 ). Antennule ( Fig. 79 ) indistinctly 5-segmented, 129–174 (148 ±13) long; armature formula: 10, 5, 4, 1, 13 + 1 aesthetasc; some setae blunt, papilliform; proximal segment with small knobs. Antenna ( Fig. 80 ) 3-segmented; proximal segment (coxa) unarmed; middle segment (basis) ornamented with surface pits; terminal claw with small seta near base; proximal segment length 31–59 (43 ± 8); middle segment length 86–122 (108 ±14); terminal claw length 22– 43 (28 ± 7); total length 153–187 (174 ± 14). Parabasal papilla ( Fig. 81 ) digitiform. Oral cone robust. Mandible ( Fig. 82 ) slender, with 3 sharp apical teeth. Maxillule ( Fig. 83 ) bilobate; inner rod-like lobe elongated, chitinized; both lobes armed with 2 tapering elements. Maxilla ( Fig. 84 ) 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 85–86 ) biramous, with both exopods composed of 2 indistinct segments and 2– segmented endopods; leg armature formula as follows:

Leg 1 ( Fig. 85 ) 71–93 (81 ± 8) long; protopod length 38–52 (45 ± 5); exopod length 32–45 (36 ± 4); endopod length 26–31 (29 ± 2). Leg 2 ( Fig. 86 ) length 73–95 (86 ± 8); protopod length 40–57 (49 ± 6); exopod length 33–38 (36 ± 2); endopod length 37–41 (39 ± 1). Protopods and rami of legs 1 and 2 respectively ornamented on anterior surfaces with rows of blunt spinules and semicircular surface wrinkles (it is uncertain whether these wrinkles are spinulate or membranous). Intercoxal sclerites of legs 1 and 2 ( Figs 87–88 ) bearing 2 long and 2 short processes.

Leg 3 ( Fig. 89 ) represented by 2 simple setae on conical process at mid-lateral surface of trunk. Leg 4 ( Fig. 90 ) represented by 1 simple lateral seta on posterior ¾ of trunk.

Attachment site. Gill filaments.

Remarks. Hatschekia zanpa n. sp. shares the 4 processes on the intercoxal sclerites of legs 1 and 2 with 10 species (see remarks of H. hemicyclium ) and 5 new species ( H. churaumi n. sp., H. hemicyclium n. sp., H. izenaensis n. sp., H. jonesi n. sp. and H. kabatai n. sp.). However, the new species is easily distinguished from them by having a genital complex distinctly separated from the abdomen, whereas all the others lack a border between the genital complex and abdomen.

Etymology. The name of the new species refers to the type locality, Cape Zanpa .

Figures

FIGURES 76 – 84. Hatschekia zanpa n. sp., female, holotype NSMT – Cr 20909. 76, habitus dorsal; 77, surface of trunk; 78, posterior part of trunk, dorsal; 79, antennule, ventral, rp = rostrum process; 80, antenna, ventral; 81, antenna with parabasal papilla (drawn from a paratype, NSMT – Cr 20910); 82, mandible; 83, maxillule; 84, maxilla. Scale bars: 76, 100 μm; 77 – 80, 84, 20 μm; 81, 50 μm; 82 – 83, 10 μm.

FIGURES 85 – 90. Hatschekia zanpa n. sp., female, holotype NSMT – Cr 20909. 85, leg 1, anterior view; 86, leg 2, anterior view; 87, intercoxal sclerite of leg 1, anterior view; 88, intercoxal sclerite of leg 2, anterior view; 89, leg 3; 90, leg 4. Scale bars: 85 – 88, 20 μm; 89 – 90, 5 μm.