Hatschekia fukurubi, 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 : 21-24

publication ID	https://doi.org/ 10.5281/zenodo.195334
DOI	https://doi.org/10.5281/zenodo.5693616
persistent identifier	https://treatment.plazi.org/id/03E387F6-B402-FFBE-91C8-F94B1FB0DB4B
treatment provided by	Plazi
scientific name	Hatschekia fukurubi
status	sp. nov.

Treatment

Hatschekia fukurubi n. sp.

( Figs 91–105 View FIGURES 91 – 99 View FIGURES 100 – 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 View FIGURES 91 – 99 ) 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 View FIGURES 91 – 99 ) 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 View FIGURES 91 – 99 ) slightly longer than wide [17–22 (20 ± 3) ×8–10 (9 ± 1)], bearing 6 naked setae.

Rostrum not expanded anteriorly. Antennule ( Fig. 95 View FIGURES 91 – 99 ) 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 View FIGURES 91 – 99 ) 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 View FIGURES 91 – 99 ) slender, with 4 sharp apical teeth. Maxillule ( Fig. 98 View FIGURES 91 – 99 ) bilobate; both lobes armed with 2 tapering elements. Maxilla ( Fig. 99 View FIGURES 91 – 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 View FIGURES 100 – 105 ) 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 View FIGURES 100 – 105 ) 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 View FIGURES 100 – 105 ) 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 View FIGURES 100 – 105 ) bearing 2 processes.

Leg 3 ( Fig. 104 View FIGURES 100 – 105 ) represented by 2 simple setae originating on mid-lateral surface of trunk. Leg 4 ( Fig. 105 View FIGURES 100 – 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.