Coelotes koshikiensis, Okumura, 2013

Okumura, Ken-ichi, 2013, Seven New Species of Spiders of the Subfamily Coelotinae (Araneae: Agelenidae) from Kyushu, Japan, Species Diversity 18, pp. 87-97 : 90-92

Coelotes koshikiensis sp. nov.

[Japanese name: Koshikijima-yachigumo] ( Fig. 3A–D )

Material examined. Holotype. NSMT-Ar 9855, male, Sesenoura, 405 m alt., Shimokoshiki Island , Kagoshima Prefecture (31°71.6′N, 129°72.2′E), 30 December 2011.

Paratypes. NSMT-Ar 9856, 1 female, same data as the holotype; NSMT-Ar 9857, 1 female, Sesenoura, 140 m alt ., Shimokoshiki Island , Kagoshima Prefecture, 30 December 2011 .

Non-type specimens. All were collected from the Koshiki Islands , Kagoshima Prefecture . Nakakoshiki Island : Mt . Kinokuchi, 220 m alt., 2 females, 29 December 2011. Shimokoshiki Island: Sesenoura , 140 m alt ., 2 females, 30 December 2011; Sesenoura , 300 m alt ., 1 male, 30 December 2011; Sesenoura , 400 m alt ., 1 female, 30 December 2011; Nagahama , 220 m alt ., 1 female, 31 December 2011; Mt. Otake, 200 m alt., 1 male and 2 females, 31 December 2011.

Diagnosis. Coelotes koshikiensis sp. nov. resembles C. gotoensis Okumura, 2007 (q.v.) in having a large and darkcolored body, a large patellar apophysis, and epigynal teeth arising from the anterior margin of the epigynum. These two species can be distinguished from each other by the structure of the genital organs in both sexes. The conductor outgrowth process is developed and the tip of the patellar apophysis is expanded in C. koshikiensis , but those of C. gotoensis are neither developed nor expanded. The epigynal teeth are quite long and narrow in C. koshikiensis , but short in C. gotoensis .

Description. Male (holotype, NSMT-Ar 9855). Total length 9.5; carapace 5.3 long, 3.4 wide; abdomen 4.2 long, 2.7 wide; sternum 2.7 long, 2.0 wide. Eye sizes: AME 0.08, ALE 0.18, PME 0.11, PLE 0.13. Distances between eyes: AME–AME 0.05, AME–ALE 0.03, PME–PME 0.09, PME– PLE 0.13, AME–PME 0.10, ALE–PLE 0.04. MOA: anterior width 0.21, posterior width 0.31, length 0.29. Leg measurements: I, 14.6 (4.0, 5.0, 3.5, 2.1); II, 12.9 (3.6, 4.3, 3.1, 1.9); III, 12.1 (3.4, 4.0, 3.2, 1.5); IV, 16.6 (4.3, 5.3, 4.9, 2.1).

Cheliceral promargin with three teeth and retromargin with two.

Palpus ( Fig. 3A, B ): patellar apophysis expanded at tip and as long as patella; LTA reduced; cymbial furrow short, one-fourth of length of cymbium; conductor short and tripartite with large conductor outgrowth process; embolus short.

Coloration: carapace blackish brown with indistinct radial flecks; ocular area darker; dorsum of abdomen dark gray with yellowish-brown chevrons; sternum brown; chelicerae, maxillae, and labium reddish brown; legs blackish brown with indistinct ring flecks.

Female (paratype, NSMT-Ar 9856). Total length 13.0; carapace 5.8 long, 3.7 wide; abdomen 7.2 long, 4.7 wide; sternum 2.9 long, 2.3 wide. Eye sizes: AME 0.09, ALE 0.18, PME 0.14, PLE 0.14. Distances between eyes: AME–AME 0.08, AME–ALE 0.06, PME–PME 0.10, PME–PLE 0.18, AME– PME 0.13, ALE–PLE 0.08. MOA: anterior width 0.26, posterior width 0.38, length 0.36. Leg measurements: I, 16.2 (4.2, 5.4, 4.1, 2.5); II, 14.3 (3.9, 4.5, 3.8, 2.1); III, 13.2 (3.6, 4.0, 3.7, 1.9); IV, 17.5 (4.5, 5.5, 5.3, 2.2).

Cheliceral promargin with three teeth and retromargin with two.

Epigynum and endogynum ( Fig. 3C, D ): epigynal plate almost hexagonal; copulatory openings situated on lateral sides of central portion of epigynum; epigynal teeth long and narrow, situated in anterior portion of epigynum close to each other; spermathecae distant from each other, anterior portion somewhat elongated, posterior part expanded.

Coloration almost same as that of male paratype.

Distribution. Koshiki Islands, Kagoshima Prefecture ( Fig. 2 ).

Etymology. The specific name, an adjective, is derived from the type locality.

Figures

Fig. 3. A–D, Coelotes koshikiensis sp. nov.; E–H, C. iriei sp. nov. A–B, NSMT-Ar 9856, holotype, male; C–D, NSMT-Ar 9855, paratype, female; E–F, NSMT-Ar 9858, holotype, male; G–H, NSMT-Ar 9859, allotype, female. A, E, Male palpus, ventral view; B, F, same, retrolateral view; C, G, epigynum; D, H, internal female genitalia. Scales: 0.5mm.

Fig. 2. Map of Kyushu, Japan, showing the distribution of Coelotes unzenensis sp. nov., C. saikaiensis sp. nov., C. koshikiensis sp. nov., and their allied species, C. bifurcates Okumura and Ono, 2006 and C. gotoensis Okumura, 2007.