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
Author
Uyeno, Daisuke
Author
Nagasawa, Kazuya
text
Zootaxa
2010
2478
1
40
journal article
10.5281/zenodo.195334
5c776f2d-8efa-408e-855d-5688a5ca2c0e
1175-5326
195334
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:
| Protopod |
Exopod |
Endopod |
| Leg 1 |
1–1 |
1–0; 6 |
0–0; 4 |
| Leg 2 |
1–0 |
1–0; 5 |
0–0; 4 |
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
.