Dysderoides muang Grismado and Deeleman, 2014

Grismado, Cristian J., Deeleman, Christa, Piacentini, Luis N., Izquierdo, Matías A. & Ramírez, Martín J., 2014, Taxonomic Review Of The Goblin Spiders Of The Genus Dysderoides Fage And Their Himalayan Relatives Of The Genera Trilacuna Tong And Li And Himalayana, New Genus (Araneae: Oonopidae), Bulletin of the American Museum of Natural History 2014 (387), pp. 1-108 : 12-20

Dysderoides muang Grismado and Deeleman , new species

Figures 2–8 , 14A

TYPES: Male holotype and two female paratypes from Thailand: Chiang Mai Province, San Kamphaeng: Tham (= cave) Muang On near the village of Ban On Lhuoy, humus, July 20, 1985, P. Leclerc ( RMNH PBI_OON 12917 ) ; one additional female paratype with same data ( RMNH PBI _OON 12916) .

ETYMOLOGY: The specific name is a noun in apposition taken from the type locality.

DIAGNOSIS: Males of this species are very similar to those of D. kanoi , new species, but the bulb is less bulging dorsally, and the basal-ventral area is more angular. The embolus is gently sinuous (fig. 14A), not as curved ventrally as in D. kanoi . Females resemble the other Thai species by having only one transverse plate in the genitalia, but the posterior receptacle is smaller (fig. 7H). This species is the only known species that has the serrulalike denticle series in the inner margin of the chelicerae, very conspicuous in the SEM images of the female (fig. 3E, F), but probably also present in males (see the suggestive darkened area in the fig. 8E).

DESCRIPTION: Male (holotype, PBI_OON 12917). Total length 1.64. Cephalothorax: Sternum without radial furrows between coxae I–II, II–III, III–IV. Mouthparts: chelicerae, endites, and labium yellowish white. Paturon inner margin with medial series of denticles (‘‘serrulalike’’). Abdomen: Pedicel tube short, unmodified. Dorsal scutum covering more than 3/4 of abdomen, more than 1/2 to most of abdomen width, not fused to epigastric scutum, yellowish white, slightly sclerotized, hard to discern. Postepigastric scutum fused to epigastric scutum, yellowish white. Interscutal membrane with setae. Legs: Leg spination (all spines longer than segment width): leg I: tibiae v2-2-2-2-0, metatarsi v2-2-0; leg II: tibiae v2-2-2-2-0, metatarsi v2-2-0; leg III: tibiae p1, v1ap, dp2- 0, metatarsi r1; leg IV: tibiae p1-1-1, v0-0-1, r1-1-1, metatarsi p1-1-0, r0-1-1. Genitalia: Epigastric furrow without setae. Copulatory bulb yellowish white, embolus slightly curved ventrally at its end (fig. 14A).

Female (paratype, PBI_OON 12917). Total length 1.78. As in male except as noted. Cephalothorax: Carapace yellow-brown; nonmarginal pars cephalica setae absent; nonmarginal pars thoracica setae absent. Sternum yellowish white, posterior margin not extending posteriorly of coxae IV; setae dark, evenly scattered. Abdomen: Dorsal scutum absent, dorsum soft portions white. Book lung covers elliptical. Epigastric scutum slightly sclerotized, hard to discern. Postepigastric scutum yellowish white, slightly sclerotized, hard to discern. Spinneret scutum absent. Dorsum setae light. Epigastric and postepigastric setae light. Legs: White. Leg spination (all spines longer than segment width): leg I: tibiae v2-2-2-2-0, metatarsi v2- 2-0; leg II: tibiae v2-2-2-2-0, metatarsi v2-2-0; leg III: tibiae v1ap, dp2-0, metatarsi r1, dp2- 0; leg IV: tibiae p1, dp2-2, metatarsi r1, dp2-2. Trichobothria base shape rounded (fig. 6A– G). Genitalia: Anterior sclerite elongated, posterior receptacle small, rounded; posterior transverse plate present, narrow, slightly procurved, with an anterior thickened border (fig. 7H).

OTHER MATERIAL EXAMINED: None.

DISTRIBUTION: Known only from a single cave in the type locality.

Figures

Fig. 2. Dysderoides muang, new species, female (PBI_OON 12917). A, B, D, F. Carapace, C, E, G. Detail of the ocular region. A, C. Dorsal view. B. Ventral view. D, E. Lateral view. F, G. Anterior view.

Fig. 3. Dysderoides muang, new species, female (PBI_OON 12917) mouthparts. A. Chelicerae, anterior view. B. Same, ventral view. C. Labium, ventral view. D. Right chelicera, venom outlet. E. Same as B, closer view, showing the intercheliceral ‘‘serrula’’ (arrow). F. Same, detail. G. Left cheliceral fang, anterior view. H. Right endite, serrula.

Fig. 4. Dysderoides muang, new species, female (PBI_OON 12917) leg morphology. A. Right leg I, prolateral view. B. Same, detail of tibia. C. Same, detail of metatarsus. D. Right leg II, prolateral view. E. Same, detail of metatarsus. F. Right metatarsus III, dorsal view. G. Right leg IV, retrolateral view. H. Same, detail of metatarsus.

Fig. 5. Dysderoides muang, new species, female (PBI_OON 12917) tarsal morphology. A–D. Right tarsi, A. Leg I, prolateral view. B. Leg II, prolateral view. C. Leg III, prolateral view. D. Leg IV, retrolateral view. E–F. Right tarsal claws. E. Leg I, prolateral view. F. Leg II, prolateral view. G. Leg III, prolateral view. H. IV, dorsal view. I. Same, retrolateral-dorsal view.

Fig. 6. Dysderoides muang, new species, female (PBI_OON 12917) trichobothria and tarsal organ morphology. A–G. Trichobothria. A. Tibia I. B. Tibia II. C. Tibia IV. D. Metatarsus I. E. Metatarsus II. F. Metatarsus III. G. Metatarsus IV. H–K. Tarsal organs. H. Leg I. I. Leg II. J. Leg III. K. Leg IV.

Fig. 7. Dysderoides muang, new species, female (PBI_OON 12917). A. Habitus, dorsal view. B. Same, ventral view. C. Same, lateral view. D. Carapace, dorsal view. E. Same, ventral view. F. Same, lateral view. G. Epigastric area, ventral view. H. Vulva, cleared, ventral view.

Fig. 8. Dysderoides muang, new species, male (PBI_OON 12917). A. Habitus, dorsal view. B. Same, ventral view. C. Same, lateral view. D. Carapace, dorsal view. E. Same, ventral view (arrow = darkened cheliceral area with presumably serrulalike denticles). F. Same, lateral view. G. Left palp, prolateral view. H. Same, ventral view. I. Same, retrolateral view.

Fig. 14. Dysderoides spp. Genital morphology. A. D. muang, new species (PBI_OON 12917). B. D. kanoi, new species (PBI_OON 43176). C. D. typhlos Fage (holotype). D. D. synrang, new species (PBI_OON 30673). A, B. Male palp, retrolateral view. C, D. Vulva, cleared, ventral view. AS = anterior sclerite; GT = glandular tube; PR = posterior receptacle; TP = transverse plates.