Ryuthela henoko, Xu & Liu & Ono & Chen & Kuntner & Li, 2017

RYUTHELA HENOKO View in CoL SP. NOV.

urn:lsid:zoobank.org:act:87781F27-394C-4452-8F3D-BF5C1B93528D

Holotype: Female (XUX-2012-468), collected near Henoko Dam , Nago-shi, Okinawajima island, Japan, 26.54°N, 128.03°E, 50 m a.s.l., 25 December 2012, by D. Li, F. X. Liu and X. Xu. GoogleMaps

Paratypes: Female (XUX-2012-471), collected at the same locality, 25 December 2012, by D. Li, F. X. Liu and X. Xu .

Etymology: The species epithet, a noun in apposition, refers to the type locality.

Diagnosis: Females of Ryuthela henoko sp. nov. differ from all other Ryuthela species except the species on Okinawajima island by the receptacular clusters close to each other at the basal part and separated from each other at the terminal part ( Fig. 6A–D); the shape of receptacular clusters of this species is similar to Ryuthela motobu sp. nov., but can be distinguished from that species by the receptacular clusters with bases close to each other ( Fig. 6A–D) and from R. nishihirai s.s. by the shape of receptacular clusters ( Fig. 6A–D). However, R. henoko sp. nov. can also be diagnosed from all other Ryuthela species on Okinawajima island by the following unique nucleotide substitutions in the standard DNA barcode alignment: G (64), G (70), G (157), T (211), C (226), G (247), A (257), T (322), T (328), T (445), T (484), T (547), C (607), C (613).

Description: Female (holotype). Carapace brown; opisthosoma light brown, with dark brown tergites; sternum narrow, much longer than wide; a few long pointed hairs running over ocular mound in a

SPECIES DELIMITATION OF RYUTHELA 887

longitudinal row; chelicerae robust with promargin of cheliceral groove with 13 denticles of variable size; legs with strong hairs and spines; opisthosoma with 12 tergites, the fifth largest; 7 spinnerets. Measurements: BL 11.85, CL 5.38, CW 4.50, OL 6.68, OW 4.82; ALE> PLE> PME> AME; palp 9.40 (3.06 + 1.68 + 2.10 + 2.56), leg I 10.74 (3.25 + 1.82 + 2.15 + 2.30 + 1.22), leg II 10.83 (3.15 + 1.90 + 2.03 + 2.45 + 1.30), leg III 10.77 (2.82 + 1.80 + 1.85 + 2.70 + 1.60), leg IV 15.39 (4.22 + 1.60 + 3.00 + 4.36 + 2.21).

Female genitalia. A pair of receptacular clusters along the anterior margin of bursa copulatrix with their basal parts close to each other; the two receptacular clusters similar in length and their length about two times their width ( Fig. 6A, B) or less than two times ( Fig. 6C, D).

Male. Unknown.

Distribution: Okinawajima island ( Henoko Dam , Nago-shi), Okinawa Prefecture, Japan.