Creopelates nohmijimensis, Uyeno, Daisuke & Nagasawa, Kazuya, 2010

Uyeno, Daisuke & Nagasawa, Kazuya, 2010, Three new species of the family Pennellidae (Copepoda: Siphonostomatoida) from gobiid fishes (Actinopterygii: Perciformes) in coastal waters of the western Pacific Ocean, Zootaxa 2687, pp. 29-44 : 30-33

publication ID	https://doi.org/ 10.5281/zenodo.199438
DOI	https://doi.org/10.5281/zenodo.6209182
persistent identifier	https://treatment.plazi.org/id/B16287D4-FFE9-FFB3-D8F2-1B3D09627A05
treatment provided by	Plazi
scientific name	Creopelates nohmijimensis
status	sp. nov.

Treatment

Creopelates nohmijimensis n. sp.

( Figs 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 )

Type material. Holotype, female ( NSMT –Cr 21191), ex Priolepis boreus (Snyder) ( Perciformes : Gobiidae ), off Irukabana (34°13’N, 132°23’E), Nohmijima Island, Hiroshima, Seto Inland Sea, Japan; 15 m depth; 12 September 2009 by D. Uyeno. Paratypes, 2 females ( NSMT –Cr 21192), ex P. boreus off Irukabana, Nohmijima Island, Hiroshima, Seto Inland Sea, Japan; 15 m depth; 12 September 2009 by D. Uyeno.

Description of postmetamorphic adult female. Body ( Fig. 2 View FIGURE 2 A) 7988–8906 (8447 ± 650) long (n = 3), curved at border of neck and trunk. Cephalothorax ( Fig. 2 View FIGURE 2 B–D) shorter than wide [634–724 (679 ± 64) × 1002–1248 (1086 ± 140)], oval bearing 4 lobes with digitate fringe. Neck region ( Fig. 2 View FIGURE 2 B) fringed with series of finely digitate lobes, arranged in about ten pairs. Trunk ( Fig. 3 View FIGURE 3 A) pyriform, longer than wide [3008–3380 (3189 ± 186) × 984 (0.27984 ± 0)], slightly curved dorsally, with anterior end narrowing towards “neck”, with posterior process ( Fig. 3 View FIGURE 3 B) located between oviduct orifices. Egg-sac uniseriate, curved on single plain ( Fig. 1 View FIGURE 1 B).

Antennule ( Fig. 3 View FIGURE 3 C) situated dorsally in proximity of antenna on anterior tip of cephalothorax; segmentation unclear, bearing 20 setae along anterior margin and 9 setae distally, 2 of which sharing common base, and 1 aesthetasc. Antenna ( Fig. 3 View FIGURE 3 D) 3-segmented, chelate, typical pennellid; proximal segment unarmed; middle segment bearing pointed protrusion along inner medial margin, terminal segment claw like. Mouth tube located near base of antenna. Maxillule ( Fig. 3 View FIGURE 3 E) bilobate; inner lobe with 2 distal setae and 1 basal seta; outer lobe bearing globular process. Maxilla ( Fig. 3 View FIGURE 3 F) 3-segmented; proximal segment bearing 1 distal projection; middle segment without armature; terminal segment covered with rows of spinules on posterior surface incompletely separated. Maxilliped absent.

Legs 1 to 4 situated at anterior end of neck region closely together, not separated by long distances. Legs 1 and 2 ( Fig. 3 View FIGURE 3 G, H) biramous, with both rami 2-segmented. Legs 3 and 4 ( Fig. 3 View FIGURE 3 I, J) uniramous, with 2- segmented exopods; leg armature formula as follows:

Protopod Exopod Endopod

Leg 1 1–1 1–1; 7 0–1; 7

Leg 2 1–0 1–1; 7 0–1; 7

Leg 3 1–0 0–0; 6

Leg 4 1–0 0–0; 5 ―

Some setae on distal segment of legs 1 to 4 blunt with papilliform tip.

Attachment site. The cephalothorax and neck region of the copepod were embedded in the host’s head and trunk musculature, while its trunk and egg sacs protruded into the water ( Fig. 1 View FIGURE 1 A, B).

Remarks. Creopelates is a monotypic genus, hitherto represented by C. floridus Shiino, 1958 (see Shiino 1958). The new species, C. nohmijimensis n. sp. can be easily separated from C. floridus by two characters: the cephalothorax bears four lobes ornamented with nodular and branching processes ( Fig. 2 View FIGURE 2 D), and leg 4 is situated close to the preceding legs.

Etymology. The specific name of the new species, nohmijimensis , refers to the type locality, Nohmijima Island in Hiroshima Bay (Seto Inland Sea), known for its high biodiversity.