Misgolas horsemanae, Wishart, 2011

Wishart, Graham, 2011, Trapdoor Spiders of the Genus Misgolas (Mygalomorphae: Idiopidae) in the Illawarra and South Coast Regions of New South Wales, Australia, Records of the Australian Museum 63 (1), pp. 33-51: 48-49

publication ID

http://doi.org/ 10.3853/j.0067-1975.63.2011.1553

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scientific name

Misgolas horsemanae


Misgolas horsemanae   n.sp.

Figs 12A–K View Fig , 14B View Fig

Type material. HOLOTYPE ♂, AMS KS2980, Kioloa State Forest Rest Area , 16 km North of Bateman’s Bay, NSW (35°36'S 150°15'E), 2 May 1979. Pitfall trap, Field No. 1565, set 23 Apr. collected 17 May 1979, C. Horseman [New South Wales, Australia]. GoogleMaps  

Other material examined. NEW SOUTH WALES: ♂, AMS KS65067, Dampier State Forest, Site 1, Coomarong Road , nr. Kianga , NSW (36°06'46"S 149°59'13"E), 10 Mar. 1999, L. Wilkie, R GoogleMaps   . Harris & H. Smith ( South East Forest Survey CBCR003-070)   .

Diagnosis. In male: Small sized dark brown spider, carapace length c. 5.3, retrodorsal surface of metatarsus IV with at least 1 spine ( Fig. 12K View Fig ); leg segments generally unicolourous, venter with prominent dark markings forming three or four transverse broken lines on pallid background ( Fig. 12E View Fig ). Spines absent on tarsi I and II ( Fig. 12F–I View Fig ). Palpal bulb ( Fig. 12B,C View Fig ) retrolateral embolic flange edge slightly curved, revolute, entire; embolus narrow, tubular, almost straight, lacking apophysis. Cymbium ( Fig. 12D View Fig ) with few sparse acicular spines arising from distal third of dorsal surface. Conformation of palpal tibia as figured ( Fig. 12A View Fig ); tibia excavation surface pallid, tibial excavation mound reduced to a swelling contiguous with retrolateral tibial apophysis. Female not known.


Male holotype ( Fig. 12A–K View Fig ). Size. Carapace length 5.34, width 4.30. Abdomen length 5.16, width 2.89. — Colour. In alcohol carapace, chelicerae and all limbs brown, generally unicolourous. Weak leg smudges on lateral surfaces of femora, patella and tibia legs I and II. Fine golden prostrate hairs sparse, present only on carapace perimeter and proximal leg segments. Abdomen dorsum dark brown, pallid transverse chevrons in bilateral series of eight. Venter with prominent dark markings forming four transverse, broken lines ( Fig. 12E View Fig ). — Carapace. Edge fringed with black bristles; some large bristles encroach onto posterior half of post foveal surface; remainder of carapace with few weak bristles; bristles absent between PME, 6 on clypeus. Area on pleuron membrane below clypeus non-chitinous, setae absent. Fovea width 0.87, procurved, deep, recurved lateral edges, posterior wall divided by prominent pitted intrusion. — Eyes. Raised on mound. Ocular area black adjacent to eyes, posterior perimeter of PLE excepted. Anterior width 0.87, posterior width 0.85, length 0.54, width/length ratio 1.57. Line joining posterior edges of ALE   coincides with anterior edges of AME. Posterior row procurved in front, recurved behind. — Chelicerae. Rastellum single row of 5(6) weak spines, c. 4(4) bristles. Fang groove and intercheliceral tumescence obscured. — Labium. Short, broad, bulbous. Length 0.56, width 0.90. Labiosternal suture continuous, narrowed centrally. — Maxillae c. 6(7) antero-ental, long pointed cuspules. — Sternum. Bulbous, length 2.76, width 2.15. Sigilla all small, round, equal in size, front and mid pairs c. own diameter from margin, posterior pair c. twice own diameter from margin. — Legs. Tibia I with distal bifid apophysis; distal process with 2(2) short, compact, straight, pointed spines; proximal process with row of 3(3) curved, pointed spines.

Palp I II III IV Femur 2.61 4.97 4.61 3.95 5.16 Patella 1.22 2.46 2.33 1.86 2.39 Tibia 2.45 3.68 3.32 2.65 4.67 Metatarsus — 3.87 3.56 3.52 4.91 Tarsus 1.19 2.76 2.40 2.25 2.83 Total 7.47 17.74 16.22 14.23 19.96

Palp. ( Fig. 12A,D View Fig ) Distal third of cymbium d surface with c. 16(18) long, acicular, inclined spines. RTA digitate, nonswollen; d surface covered with 47(60) short, pointed spines. Tibial excavation rv edge with a suspended brush of c. 32(35) long spines extending onto short horizontal DTA. TEM absent. Tibial excavation chitinized, TET not seen. — Bulb. ( Fig. 12B,C View Fig ) Length 1.41. Embolic rl flange edge slightly curved, revolute, entire; flange d surface smooth, without folds. Embolus narrow, tubular, almost straight, apophysis absent. — Scopula   . Complete on tarsi I and II; sparse, complete on tarsi III and IV; metatarsi I and II incomplete; metatarsi III weak distal remnant; absent on metatarsi IV. — Trichobothria. Palp: tarsi 8, tibia pd 6, rd 6. Leg I: tarsi 10, metatarsi 12, tibia pd 6, rd 6. Leg II: tarsi 10, metatarsi 10, tibia pd 5, rd 6. Leg III: tarsi 10, metatarsi 8, tibia pd 6, rd 7. Leg IV: tarsi 11, metatarsi 11, tibia pd 8, rd 7. — Leg spination. ( Fig. 12F–K View Fig ) Leg I: metatarsi v 012; tibia v 0112. Leg II: metatarsi v 8 scattered; tibia v 6 scattered, pd 0110 (broken off). Leg III: tarsi pl 01000, rl 01010; metatarsi v 8 scattered, d 020220; tibia v 0122, pl 0110, rl 0110; patella pd 3. Leg IV: tarsi v 7 scattered; metatarsi v 9 scattered; pd 010 (broken off), rd 010010 (1 broken off); tibia v 5 (broken off) scattered, rd 01110 (broken off). — Abdomen. Dorsum with sparse cover long, erect, brown bristles with fine, underlying setae. Lateral surfaces and venter with dense cover of long fine hairs.

Taxonomic notes. Male specimen AMS KS65067 collected about 75 km south of the type locality appears to be morphologically identical to the holotype specimen with exception of the former lacking a venter pattern. Both specimens lack a tibial excavation mound and tibial excavation texture. Complementing this the male bulb lacks an apophysis and the retrolateral embolic flange edge is entire. The two specimens are taken to be conspecific with reservations.

Etymology. The species is named in recognition of Christine Horseman, one time technical officer and industrious collector of spiders in the arachnology section of the Australian Museum.

Distribution and natural history ( Fig. 14B View Fig ) Known only from the type locality near the township of Kioloa and c. 75 km S in the Dampier State Forest. The burrow is not known.


Departamento de Geologia, Universidad de Chile