A new species of Prohatschekia Nunes-Ruivo, 1954 (Siphonostomatoida: Hatschekiidae) from the scorpaenid fish, Scorpaena neglecta Temminck & Schlegel, 1843 (Scorpaeniformes: Scorpaenidae), in Korean waters
Author
Moon, Seong Yong
Author
Youn, Seok-Hyun
Author
Maran, Balu Alagar Venmathi
text
Zootaxa
2016
4174
1
153
160
journal article
38055
10.11646/zootaxa.4174.1.11
1b7e8cc5-3a1e-4681-aa30-037f336ba1d5
1175-5326
160048
E6362683-858A-4C2A-A490-3F7A0F399938
Prohatsckekia pseudocremouxi
sp. nov.
(
Figs. 1–11
)
Type
material.
Holotype
♀
(dissected and mounted on a glass slide; reg. no. NIBRIV0000266711) and
paratype
♀
(preserved in ethanol; reg. no. NIBRIV0000266712), collected from the gills of five specimens of
Scorpaena neglecta
(Actinopterygii,
Scorpaeniformes
,
Scorpaenidae
), captured north off
Jeju
Island
(
33º43’47”N
,
126º48’16”E
)
,
Korea
, at
102 m
depth.
Description of female.
Body comprising distinct cephalothorax, short neck region consisting of second and third pedigerous somites, and trunk (
Fig. 1
). Body (
Fig. 1
) 1.38 (
paratype
)–1.45 (
holotype
) mm long. Cephalothorax (
Fig. 1
) (253 × 346 µm), 1.36 times wider than long: dorsal cephalothoracic shield with frontal margin produced, slightly concave in mid-line, rounded laterally and well defined posteriorly; shield with conspicuous cuticular strengthening bars visible externally. Parabasal papillae on anterior margin of cephalothorax simple, anteriorly-directed, visible in dorsal view (arrowed in
Fig. 1
). Neck region formed by narrow second and third pedigerous somites, merging into board, slightly dorsoventrally flattened trunk. Trunk (
Fig. 1
) ovoid (937 × 506 µm), about 1.85 times longer than wide, with swollen posterodistal margins. Abdomen (
Fig. 2
) wider than long (121 × 153 µm). Caudal rami (
Fig. 1
) longer than wide (59 × 34 µm), carrying one lateral and five terminal setae. Egg sac (
Fig. 3
)
1.64 mm
long, containing
19 eggs
.
Antennule (
Fig. 4
) 328 µm long, indistinctly 7-segmented; armature formula: 10, 6, 4, 2, 1, 3 + aesthetasc, 9 + aesthetasc. Antenna (
Fig. 5
) 3-segmented; basal segment unarmed; middle segment elongate, with single seta proximally and entire surface with fine, transverse cuticular ridges; distal segment strongly curved with transverse cuticular ridges in proximal half, subchela with two inner setae, one proximally and one near base of claw. Mandible (
Fig. 6
) forming stylet with pointed tip, marginal teeth lacking. Maxillule (
Fig. 7
) bilobate; anterolateral lobe with two small setae; posterior lobe longer, with two long distal setae. Maxilla (
Fig. 8
) 4-segmented, proximal segment unarmed; second segment largest, with long proximal seta on inner margin; third segment slender, with small distal seta on inner margin; distal segment bearing small inner seta at base of bifid claw. Maxilliped absent.
Legs 1–3 (
Figs. 9–11
) with coxa and basis largely fused, biramous. Exopods incompletely segmented. Setae on rami usually plumose.
FIGURES 1–8
.
Prohatschekia pseudocremouxi
sp. nov.
(female). 1, habitus, dorsal (right parabasal papilla and setae representing leg 4 arrowed); 2, posterior part of trunk and caudal rami, ventral; 3, egg sac, dorsal; 4, antennule, dorsal; 5, antenna, dorsal; 6, mandible, dorsal; 7, maxillule, dorsal; 8, maxilla, dorsal. Scale bars: 1, 3 = 200 µm; 2, 4–5 = 50 µm; 6–8 = 25 µm.
FIGURES 9–11.
Prohatschekia pseudocremouxi
sp. nov.
(female). 9, leg 1, dorsal; 10, leg 2, dorsal; 11, leg 3, dorsal. Scale bars = 50 µm.
Armature formula as follows: Leg 1 (
Fig. 9
) exopod indistinctly 2-segmented; endopod unsegmented and ornamented with eight complete and incomplete transverse cuticular ridges on anterior and posterior surfaces. Leg 2 (
Fig. 10
) exopod indistinctly 2- segmented, proximal segment of exopod with tiny spinules on inner and outer margin, distal segment of exopod with four transverse cuticular ridges on anterior surface; endopod 2-segmented and ornamented with three transverse cuticular ridges, distal segment with eight incomplete transverse cuticular ridges on anterior and posterior surfaces. Leg 3 (
Fig. 11
) exopod distinctly 2-segmented and ornamented with tiny spinules on inner and outer margins of proximal segment, distal segment with four incomplete transverse cuticular ridges on anterior and posterior surfaces; endopod 2-segmented and ornamented with tiny spinules on inner and outer margin of proximal segment; four transverse cuticular ridges on anterior surface of distal segment. Leg 4 (arrowed in
Fig. 1
) represented by one seta located posteriorly at 2/3 distance along trunk. Leg 5 absent.
| Protopod |
Exopod |
Endopod |
| Leg 1 |
1-1 |
I-0; 6 |
5 |
| Leg 2 |
1-0 |
I-0; 5 |
0-1; 4 |
| Leg 3 |
1-0 |
I-0; 4 |
0-1; 3 |
Male.
Unknown
Etymology.
The name of the new species refers to its morphological similarity with
Prohatschekia cremouxi
Nunes-Ruivo, 1954
.