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

Xu, Xin, Liu, Fengxiang, Ono, Hirotsugu, Chen, Jian, Kuntner, Matjaž & Li, Daiqin, 2017, Targeted sampling in Ryukyus facilitates species delimitation of the primitively segmented spider genus Ryuthela (Araneae: Mesothelae: Liphistiidae), Zoological Journal of the Linnean Society 181, pp. 867-909 : 904

publication ID	F160993-028B-4CBB-A233-54F82230E0AD
publication LSID	lsid:zoobank.org:pub:F160993-028B-4CBB-A233-54F82230E0AD
persistent identifier	https://treatment.plazi.org/id/A54587BB-FFF9-FFF7-B467-FD9CEF32D57F
treatment provided by	Plazi
scientific name	Ryuthela yarabu
status	sp. nov.

Treatment

RYUTHELA YARABU View in CoL SP. NOV.

urn:lsid:zoobank.org:act:80F64EF2-F931-4C70-AA31-81BFFFBEDD92

Holotype: Female (XUX-2013-251), collected at Mt. Yarabu dake, Ishigakijima island, Okinawa Prefecture, Japan, 24.44°N, 124.10°E, 111 m a.s.l., 11 July 2013, by D. Li and B. Wu. GoogleMaps

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

Diagnosis: Female Ryuthela yarabu sp. nov. differs from all the other Ryuthela species except R. banna sp. nov. by the slightly globose receptacular clusters separated at the basal part, but cannot be morphologically diagnosed from R. banna sp. nov. ( Fig. 18A, B). The highly variable female genitalia of Ryuthela fail to diagnose species on Ishigakijima island and Iriomotejima island. However, R. yarabu sp. nov. can be diagnosed from all other Ryuthela species on Ishigakijima island and Iriomotejima island by the following unique nucleotide substitutions in the standard DNA barcode alignment: C (67), C (79), C (91), G (157), G (172), A (250), T (259), T (263), T (322), A (379), T (383), G (406), G (506), G (538), C (577), C (592), A (595), G (604), T (617).

Description: Female (holotype). Carapace and opisthosoma yellow brown; tergites darker brown; sternum narrow, nearly twice as long as wide; a few long pointed hairs running over ocular mound in a longitudinal row; chelicerae robust with promargin of cheliceral groove containing 15 vestigial denticles of variable size; legs with strong hairs and spines; opisthosoma with 12 tergites; 8 spinnerets. Measurements: BL 11.50, CL 5.60, CW 4.70, OL 5.60, OW 4.60; ALE> PLE> PME> AME; palp 9.08 (3.10 + 1.65 + 1.88 + 2.45), leg I 11.21 (3.60 + 1.98 + 2.05 + 2.30 + 1.28), leg II 10.74 (3.31 + 1.78 + 1.85 + 2.40 + 1.40), leg III 11.61 (3.23 + 2.00 + 1.75 + 2.98 + 1.65), leg IV 17.43 (4.68 + 2.30 + 3.10 + 4.80 + 2.55).

Female genitalia. A pair of receptacular clusters along the anterior margin of bursa copulatrix, basally separated from each other, short cylinder shaped without any granulum in dorsal view ( Fig. 18A, B).