Parobisium namkungi Jeong & Harms sp. nov.

urn:lsid:zoobank.org:act: AB5DE941-C97D-4ECD-A26D-A36AC3CEB120

(Figs 4–5)

Material examined. Holotype ♀, SOUTH KOREA: Chungcheongnam-Province, Nonsan-si, Byeolgok-myeon, Keunyonggul-cave, 36° 09' N, 127° 17' E; 13 June 2013; JH Oh leg. JBNUJH07.

Etymology. The species is named in honor of Mr. Jun Namkung, a pioneering arachnologist in Korea, in recognition of his significant contributions to Korean arachnology and speleology.

Diagnosis. This species is morphologically similar to Parobisium yosemite Cokendolpher and Krejca, 2010 in U.S.A. in the following characteristics: small anterior eyespots, pedipalpal femur longer than 1.4mm, and three pairs of setae on the posterior margin of carapace. However, both species can be distinguished by the following characteristics: the number of carapacal setae (23 in P. yosemite vs 26 in P. namkungi sp. nov.) and the number of blades of the rallum (eight in P. yosemite vs six in P. namkungi sp. nov.).

Description

Female, adult (holotype) (Figs. 4, 5)

Colour. Pedipalp, chelicera, and the anterior margin of the carapace strongly red; posterior margin of the carapace, legs, and abdomen brown (Fig. 4).

Chelicera (Fig. 5B). Palm smooth and with seven setae, one seta on the movable finger, nine marginal teeth on the fixed finger, 10 on the movable finger; serrula exterior with 30 blades, rallum with six blades.

Pedipalp (Figs 5D, E). Trochanter 1.9, femur 4.0, patella 2.6, chela 3.5, hand 1.9 times longer than broad, movable finger 1.2 times longer than the hand. Fixed finger with eight trichobothria, movable finger with four trichobothria: esb and eb positioned laterally; ib and isb positioned paraxially on the basal of the fixed finger, ist positioned on the dorsum of the fixed finger, grouped with ib and isb; est positioned medially on the fixed finger, positioned between et and ist; et and ist positioned terminally; b positioned on the basal of the movable finger, sb positioned between b and st; t positioned next to st, about two areolar apart. Fixed finger with 81, movable finger with 76 small and dentate marginal teeth.

Cephalothorax (Figs 5A, C). Carapace 2.0 times longer than broad, posterior eyes absent, anterior eyespots present, epistome small and triangular, 26 setae on the carapace, two pairs of setae on the anterior margin, three pairs of setae on the posterior margin. Three long and acuminate setae on the manducatory process, maxilla with seven setae; coxal chaetotaxy 9: 6: 3: 8.

Abdomen (Fig. 5G). Pleural membrane granulate; both tergites and sternites undivided; tergal chaetotaxy 6: 8: 10: 10: 12: 12: 12: 12: 11: 10: 6: 2; sternal chaetotaxy 12: 10: 10: 8: 8: 8: 9: 9: 8: 7: 2.

Legs (Figs 5F, H). Leg I: trochanter 1.7, femur 3.6, patella 2.8, tibia 6.4, metatarsus 3.2, tarsus 5.9 times longer than broad. Leg IV: trochanter 2.1, femur + patella 3.7, tibia 5.8, metatarsus 2.9, tarsus 4.5 times longer than broad. Arolium undivided; one pseudotactile seta present in the middle of the leg IV metatarsus.

Genitalia (Fig. 5G). Typical shape of the genus Parobisium. Sternite II with 12 setae; ten setae on the sternite III arranged in a single row.

Dimensions (in mm). Body length 2.54. Pedipalp: trochanter 0.63/0.33, femur 1.46/0.37, patella 1.32/0.51, chela 2.35/0.67, hand 1.27/0.67, movable finger 1.07. Chelicera: total 0.79/0.39, hand 0.21/0.39, movable finger 0.59. Leg I: trochanter 0.32/0.19, femur 0.61/0.17, patella 0.44/0.16, tibia 0.7/0.11, metatarsus 0.29/0.09 tarsus 0.47/0.08. Leg IV: trochanter 0.48/0.22, femur + patella 1.14/0.31, tibia 1.05/0.18, metatarsus 0.38/0.13, tarsus 0.54/0.12.