Misgolas davidwilsoni, Wishart & Rowell, 2008

Wishart, Graham & Rowell, David M., 2008, Trapdoor Spiders of the Genus Misgolas (Mygalomorphae: Idiopidae) from Eastern New South Wales, With Notes on Genetic Variation, Records of the Australian Museum 60 (1), pp. 45-86 : 64-65

Misgolas davidwilsoni n.sp.

Figs 12A–F , 24C

Type material. HOLOTYPE?, AM KS51761 , Lisarow (33°23'S 151°23'E), 28 Jan. 1998, Lyn Abra . PARATYPE?, AM KS51775 , Wyoming (33°27'S 151°21'E), 25 Feb. 1999, Lyn Abra .

Diagnosis. In male: medium sized tan spider, carapace length c. 7.3–7.8; retrodorsal surface of metatarsi IV without spines ( Fig. 12E ). Venter pale with pattern of brown speckles in 2–3 weak transverse bands ( Fig. 12F ). Spines absent on tarsi I;

Description

Male holotype ( Figs 12A–F ). Size. Carapace length 7.31, width 5.77. Abdomen length 7.37, width 4.61. Colour. In alcohol carapace, legs, palps and chelicerae mid tan, darker brown smudges absent from lateral limb surfaces. Golden fuscous hairs on caput, absent on limbs. Abdomen dorsum dark brown with distinct pattern of pallid bands in bilateral series of six. Venter pallid with brown speckles most concentrated into three weak transverse bands ( Fig. 12F ). Carapace. Edge fringed with black bristles that encroach onto posterior third of post foveal surface. Line of c. 8 median bristles on caput arch. Group of 10 bristles between PME; 3 posteriorly inclined bristles on clypeus; group of c.10 smaller setae on weakly chitinous area extending onto pleuron membrane below clypeus. Fovea width 1.43, slightly recurved, edges recurved, pitted intrusion absent from posterior wall. Eyes. Raised on mound, area immediately adjacent to eyes black, PME excepted; anterior width 1.31, posterior width 1.20, length 0.67, width/length ratio 1.95. Line joining posterior edge of ALE transects anterior third of AME. Posterior row straight. Chelicerae. Rastellum row of 6(5) spines on anteroental edge; few smaller spines retreating along pd edge. Intercheliceral tumescence small, pallid, elongate, raised on a cant. Fang groove with 11(11) promarginal teeth and 14(15) smaller retromarginal/intermediate row teeth. Labium. Bulbous, length 0.79, width 1.04. Labio-sternal suture broad, narrowed medially, undivided. Maxillae c. 43(51) short blunt anteroental cuspules. Sternum. Length 3.80, width 2.82. Sigilla round, anterior pair small and closest to margin, mid and posterior pairs progressively larger, their own diameter away from margin. Legs. Tibia I with distal bifid apophysis; distal process with 2(2) short straight spines, proximal process with 2(2) long bent pointed spines.

palp I II III IV femur 3.44 6.39 5.89 4.85 6.63 patella 1.72 3.19 2.94 2.33 3.07 tibia 3.44 4.61 4.11 2.89 5.71 metatarsus — 4.42 3.99 3.68 5.46 tarsus 1.72 2.76 2.58 2.34 2.70 total 10.32 21.37 19.51 16.09 23.57

Palp ( Fig. 12A ). Cymbium with c. 54 long, pointed, skewerlike spines, anteriorly inclined c. 45° to cymbium axis, distributed over distal half of d surface. RTA digitate, not swollen basally, inclined slightly downwards, covered with squat pointed d and rd spines which continue along rv edge of tibial excavation terminating with an extended brush of c. 9 long spines. DTA small, reduced to a mound. TEM large, pallid, adjacent to RTA. TET weak, visible on pl region of TEM. Bulb. ( Fig. 12B,C ) Embolic rl flange narrow, with c. 7 fine folds, margin curved under embolus. Embolus curved pl. Tip with pl bend, surmounted by small distally pointed pd apophysis. Scopula. Dense and complete on tarsi I and II; dense on distal fifth of metatarsi I and II; absent on legs III and IV. Trichobothria. Palp: tarsi 8, tibia pd 5, rd 5. Leg I: tarsi 10, metatarsi 10, tibia pd 6, rd 6. Leg II: tarsi 10, metatarsi 10, tibia pd 6, rd 6. Leg III: tarsi 9, metatarsi 7, tibia pd 6, rd 5. Leg IV: tarsi 10, metatarsi 11, tibia pd 7, rd 6. Leg spination. Leg I: metatarsi v 00113; tibia v 0112. Leg II: ( Fig. 12D ) tarsi rv row of 13 small spines adjacent to scopula; metatarsi v 12 scattered; tibia v 01113. Leg III: tarsi v 42 scattered; metatarsi v 11 scattered, d 002120; tibia v 0113, pd 010, rd 00110; patella pd 8. Leg IV: ( Fig. 12E ) tarsi v 35 scattered; metatarsi v 0222. Abdomen. Dorsum with cover of long brown hairs increasing in number and becoming finer laterally and covering venter. Dorsum hairs with underlying fine hairs.

Etymology. The species is named in recognition of Dr David Wilson, venoms researcher.

Distribution and natural history ( Fig. 24C ). This spider is known only from the Lisarow-Berkley Vale locality of the N.S.W. Central Coast. The burrow is unknown.

Figures

Fig. 12. Misgolas davidwilsoni n.sp. A–F?, holotype AM KS51761: (A), right palp retrolateral. (B,C), right bulb: B, dorsal; C, prolateral. (D), right tarsus and metatarsus II ventral. (E), right leg IV retrolateral. (F), venter.

Fig. 24. A–D. Distribution of Misgolas species in the New South Wales Central Coast (eastern Australia) based on material examined (Inset [Fig. 24A] with catchment area).