Misgolas shawi, 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: 47-48

publication ID

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

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scientific name

Misgolas shawi


Misgolas shawi   n.sp.

Fig. 11A–G View Fig , 14B View Fig

Type material. HOLOTYPE ♂, AMS KS12506 (abdomen distorted and discoloured, sternum bilaterally compressed and distorted), Bega, NSW (36°41'S 149°51'E), 23 May 1983, R. Thompson [New South Wales, Australia]. GoogleMaps  

Other material examined. NEW SOUTH WALES: ♀, AMS KS36580, Candello , NSW (36°46'S 149°42'E), 17 May 1973, M. Gray GoogleMaps   .

Comparing the appearance of this latter female specimen with the neighbouring (17 km apart) male holotype M. shawi   n.sp. there is suspicion of synonymy, e.g., absence of spines on rd surface of metatarsi IV and venter entirely pallid. Contradicting this is the elongate bilateral leg blotches on legs I and II along full length of relevant leg segments. Until more specimens are collected from the area, a definite species assignment cannot be made for the female specimen.

Diagnosis. In male: Medium sized brown spider, carapace length c. 6, retrodorsal surface of metatarsus IV without spines ( Fig. 11G View Fig ); venter entirely pallid ( Fig. 11D View Fig ); some disconnected dark brown smudges on leg I tibia and patella lateral surfaces ( Fig. 11E–F View Fig ). Spines absent on tarsi I and II ( Figs.11E,F View Fig ), numerous on ventral surface of tarsi III and IV. Palpal bulb ( Fig. 11B,C View Fig ) retrolateral embolic flange with c. 5 major folds, c. 2 minor folds; embolus with thornlike dorsal apophysis placed nearer embolic flange than embolus tip; tip from dorsal aspect with prolateral bend. Conformation of palpal tibia as figured ( Fig. 11A View Fig ). Female not known.


Male holotype ( Fig. 11A–G View Fig ). Size. Carapace length 6.02, width 5.40. Abdomen length 5.83, width 4.30. — Colour. In alcohol carapace, limbs and chelicerae brown. Some disconnected darker brown smudges on tibia and patella lateral surfaces of legs I and II. Carapace and limbs with very few sparse golden hairs.Abdomen dorsum discoloured. Venter pallid, wrinkled, no dark pattern perceived ( Fig. 11D View Fig ). — Carapace. Edge fringed with black bristles which encroach onto posterior half of post foveal surface; very few scattered interstrial bristles. Evidence of row of c. 6 black bristles on caput arch (some removed); 4 between PME; 2 large bristles and 5 other setae on clypeus. Weakly chitinized area on pleuron membrane below clypeus with 5 bristles and few fine setae. Fovea width 1.33, straight, recurved edges, deep, posterior wall centrally divided by small pitted intrusion. — Eyes. Raised on a mound. Ocular area darker adjacent to eyes. Anterior width 1.18, posterior width 0.96, length 0.70, width/length ratio 1.69. Line joining posterior edges of ALE   transects anterior third of AME. Posterior row straight in front, recurved behind. — Chelicerae. Rastellum single row of 7(7) weak spines. Fang groove with 7 promarginal teeth and 13 smaller retromarginal/intermediate row teeth. Left fang groove and intercheliceral tumescence obscured. — Labium. Bulbous, length 0.79, width 1.20. Labiosternal suture laterally broad, narrow midway. — Maxillae c. 37(46) antero-ental short rotund cuspules, none 48 Records of the Australian Museum (2011) Vol. 63 surmounted by a hair. — Sternum. Bilaterally compressed, distorted. Length 3.52, width 2.01. Sigilla misshapen. — Legs. Tibia I with distal bifid apophysis; distal process with 2(2) short compact spines, proximal process with row of 3(3) longer curved pointed spines.

Palp I II III IV Femur 3.95 6.39 6.02 4.79 6.45 Patella 1.87 3.01 2.82 2.33 2.82 Tibia 3.56 4.30 4.05 2.89 5.59 Metatarsus — 4.48 4.17 3.93 6.20 Tarsus 1.54 2.61 2.64 2.57 3.01 Total 10.92 20.79 19.70 16.51 24.07

Palp. ( Fig. 11A View Fig ) Distal half of cymbium d surface with many long attenuate anteriorly inclined spines. RTA midway with small rl swelling; d, rd and small swelling surfaces covered with pointed spines. Tibial excavation rv edge with 10 short smaller spines progressing distally along edge and increasing in length forming a suspended brush of 11 spines; 6 spines terminate hooked DTA. TEM of right palp collapsed. Both right and left TEMs weakly chitonized; TET not seen. — Bulb. ( Fig. 11B,C View Fig ) Length 2.05; length from embolic apophysis to embolus tip (a) 0.38; length from rl flange terminus to embolus tip (f) 0.66; a/f ratio 0.57. Embolic rl flange with 5 major folds and 2 minor folds, edge gently curved. Embolus with prominent d thorn-like apophysis placed nearer embolic flange than embolus tip; tip from d aspect with pl bend. — Scopula   . Complete and weak on tarsi I and II; small sparse incomplete on metatarsi I and II; absent on legs III and IV. — Trichobothria. Palp: tarsi 9, tibia pd 6, rd 5. Leg I: tarsi 13, metatarsi 12, tibia pd 7, rd 7. Leg II: tarsi 11, metatarsi 13, tibia pd 6, rd 7. Leg III: tarsi 13, metatarsi 10, tibia pd 6, rd 7. Leg IV: tarsi 11, metatarsi 12, tibia pd 8, rd 8. — Leg spination. Leg I: metatarsi pv 01, rv 0111; tibia rv 0111. Leg II: metatarsi pv 011, rv 02112; tibia v 01112, pv 000010. Leg III: tarsi v 12 scattered, metatarsi v 10 scattered, pl 001110, rl 001110; tibia v 0114, pl 00110, rl 00110; patella pd 2. Leg IV: tarsi pv 14 scattered, rv 4; metatarsi v 14 scattered; tibia v 012. — Abdomen. Dorsum with sparse cover of small prostrate bristles underlying many erect long brown bristles. Venter covered with weak short erect brown bristles.

Etymology. The species is named in recognition of Dr David Shaw whose genetic studies over many years has contributed greatly in understanding characteristics of hybrid zone dynamics.

Distribution and natural history ( Fig. 14B View Fig ) This species is known only from the type locality, the town of Bega, New South Wales, Australia. The burrow is not known.


Departamento de Geologia, Universidad de Chile