Misgolas grayi, 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: 76-79

publication ID

http://doi.org/ 10.3853/j.0067-1975.60.2008.1495

persistent identifier

http://treatment.plazi.org/id/CE27C928-FF97-5934-FC63-FBE592BFFFB9

treatment provided by

Felipe

scientific name

Misgolas grayi
status

n.sp.

Misgolas grayi   n.sp.

Figs 20A–I View Fig , 24D View Fig

Type material. HOLOTYPE?, AM KS86203, Gloucester Caves, N.S.W., Glow-worm Cave , Seive GL 2 (32°25'S 151°41'E), 22 Jun.2003, M. Gray; holotype collected from burrow as penultimate juvenile 22 June 2003; reared to adult male 13 Oct. 2003 GoogleMaps   . ALLOTYPE!, AM KS69976, data as for holotype GoogleMaps   . PARATYPE!: AM KS69977, data as for holotype GoogleMaps   .

Diagnosis. Small (male carapace length, c. 5.1) to medium (female carapace length, c. 6.6) light brown spiders; retrodorsal surface of metatarsi IV with weak spines, at least one midway ( Fig. 20G View Fig ); venter entirely pallid ( Fig. 20E,F View Fig ). Perimeter of? carapace fringed with single orderly file black bristles ( Fig. 20D View Fig ),! with weaker brown bristles ( Fig. 20H View Fig ). In male: palpal bulb ( Fig. 20B,C View Fig ) with retrolateral embolic flange with many extremely fine folds, distal edge curved under embolus; embolus tip twisted, with prolateral bend, embolic apophysis absent. Conformation of palp as figured ( Fig. 20A View Fig ). Burrow entrance as figured ( Fig. 20I View Fig ).

Description

Male holotype ( Fig. 20A–E View Fig ). Size. Carapace length 5.15, width 3.99. Abdomen length 4.24, width 2.95. Colour. In alcohol carapace, legs, palps and chelicerae light tan; dark brown smudges absent from lateral limb surfaces. Few sparse pallid hairs on caput, absent on limbs. Abdomen dorsum dark brown, with broad pallid chevrons in bilateral series of six. Venter entirely pallid ( Fig. 20E View Fig ). Carapace. ( Fig. 20D View Fig ) Entire edge fringed with single orderly file of black bristles, c. 10, encroach onto the post foveal surface. Rows of 3 or 4 black bristles along each stria; row of 6 on caput arch. Group of 3 bristles between PME. Group of 5 bristles on clypeus. Area extending onto pleuron below clypeus only slightly chitinous and bearing one hair. Fovea width 0.77, straight with recurved edges, posterior wall not pitted. Eyes. AME raised on pronounced mound, area surrounding anterior row black. Anterior and posterior row widths equal, 0.89, length 0.64, width/length ratio 1.39. Line joining posterior edge of ALE   transects anterior third of AME. Posterior row straight in front, recurved behind. Chelicerae. Rastellum a single row of 5(6) weak spines; posterior spines absent. Intercheliceral tumescence entirely pallid, each covered with c. 17 setae. Fang groove with 9(9) promarginal teeth, 7(7) smaller retromarginal/intermediate row teeth. Labium. Slightly bulbous, twice as wide as long, length 0.53, width 1.04. Labio-sternal suture narrow, centrally divided. Maxillae c. 10(18) small, stick-like anteroental cuspules. Sternum. Length 2.58, width 2.03. Sigilla all small, round. Anterior pairs submarginal, posterior pair c. its own diameter from margin. Legs. Tibia I with distal bifid apophysis; distal process with 2(2) straight pointed spines, proximal process with 3(3) longer curvilinear pointed spines.

palp I II III IV femur 2.84 4.97 4.67 3.99 5.16 patella 1.33 2.33 2.09 1.84 2.33 tibia 2.71 3.56 3.44 2.58 4.54 metatarsus — 3.68 3.50 3.38 4.91 tarsus 1.15 2.21 2.15 2.07 2.58 total 8.03 16.75 15.85 13.86 19.52

Palp ( Fig. 20A View Fig ). Cymbium with c. 18 long, attenuate, anteriorly inclined spines distributed over distal half of d surface. RTA digitate, without swelling, almost horizontal, covered with squat pointed d and rd spines. Smaller spines on proximal half of rv edge of tibial excavation; c. 18 longer spines on distal half continuing onto short, straight DTA parallel to RTA. TEM small, pointed, adjacent to RTA. TET not seen. Bulb. ( Fig. 20B,C View Fig ) Embolic rl flange with many extremely fine folds, gently convexly curved, distal edge curved under embolus. Embolic apophysis absent; tip twisted and with pl bend. Scopula. Complete, sparse and weak on tarsi I and II, a few apical scopula setae on metatarsi I and II; absent on legs III and IV. Trichobothria. Palp: tarsi 7, tibia pd 5, rd 6. Leg I: tarsi 10, metatarsi 11, tibia pd 6, rd 5. Leg II: tarsi 10, metatarsi 10, tibia pd 6, rd 6. Leg III: tarsi 11, metatarsi 10, tibia pd 5, rd 6. Leg IV: tarsi 10, metatarsi 12, tibia pd 7, rd 6. Leg spination. Leg I: tarsi pv 0110, rv 01110; metatarsi pv 0011, rv 0112; tibia rv 0112, pl 010. Leg II: tarsi pv 00111010; metatarsi v 12 scattered; tibia v 0112, pd 0110; Leg III: tarsi v 12 scattered; metatarsi v 10 scattered, d 002220; tibia v 0113, d 03320; patella pd 3. Leg IV: tarsi v 10 scattered; metatarsi v 10 scattered, rd 010; tibia v 6 scattered, rl 0110. Abdomen. Dorsum with cover of long dark brown bristles, longer on anterior surface. Smaller bristles extend to and become abundant on venter. Underlying fine setae absent.

Female allotype. ( Fig. 20F–H View Fig ). Size. Carapace length 6.57, width 3.99. Abdomen length 7.74, width 2.95. Colour. In alcohol carapace, legs, palp and chelicerae as for male. Dark brown smudges absent from lateral limb surfaces. Very few fine pallid hairs on caput, absent on limbs. Abdomen dorsum deteriorated, dorsum of paratype AM KS69977 as for male. Venter entirely pallid. Carapace. ( Fig. 20H View Fig ) Bristle arrangement similar to and as for male excepting bristles reduced in size. Group of 7 on clypeus. Area extending onto pleuron below clypeus not chitinous, with 1 large and 2 small bristles. Fovea width 0.98, deep, straight with recurved edges, posterior wall centrally divided by small pitted intrusion. Eyes. AME and PME placed on mound. Area immediately surrounding eye margins black. Anterior width 1.13, posterior width 1.15, length 0.69, width/length ratio 1.67. Line joining posterior edge of ALE   transects anterior quarter of AME. Posterior row procurved in front, recurved behind. Chelicerae. Rastellum front row of 7(7) strong spines, 2(2) spines behind. Fang groove with 9(10) promarginal teeth and 13(11) smaller retromarginal/intermediate row teeth. Labium. Broad, bulbous, length 0.82, width 1.33. Labio-sternal suture as for male. Maxillae c. 44(42) short blunt anteroental cuspules. Sternum. Length 3.55, width 2.80. Sigilla as for male. Anterior pair its own diameter, midpair 1.5 diameters and posterior pair 2 diameters from margin. Legs   .

palp I II III IV femur 3.99 5.16 4.54 3.67 5.26 patella 2.21 2.88 2.70 2.29 3.07 tibia 2.64 3.31 2.94 2.09 4.42 metatarsus — 2.76 2.64 2.53 4.11 tarsus 2.64 1.72 1.66 1.70 2.08 total 11.48 15.83 14.48 12.28 18.94

Scopula. Complete on palpal tarsi, complete and weak on tarsi I and II, few distal scopula setae on metatarsi I and II; absent on legs III and IV. Trichobothria. Palp: tarsi 8, tibia pd 6, rd 6. Leg I: tarsi 12, metatarsi 11, tibia pd 7, rd 6. Leg II: tarsi 13, metatarsi 11, tibia pd 7, rd 7. Leg III: tarsi 12, metatarsi 9, tibia pd 6, rd 7. Leg IV: tarsi 11, metatarsi 15, tibia pd 8, rd 7. Leg spination. Palp: tarsi pl 110000, rl 110000; tibia v 0222, rv 01110, pl 00011. Leg I: tarsi 1 sub-distal; metatarsi v 11 scattered; tibia v 011113. Leg II: tarsi rv 6 scattered on distal half; metatarsi v 11 scattered; tibia v 0011113. Leg III: tarsi v 8 scattered; metatarsi v 10 scattered, d 02220; tibia v 0113, pd 0110, rd 0110; patella pd 3. Leg IV: ( Fig. 20G View Fig ) tarsi v 9 scattered on distal two-thirds; metatarsi v 01213, rd 01010; tibia v 7 scattered. Abdomen. Dorsum with sparse cover of weak dark brown bristles most concentrated and longer on median surface; longest bristles on anterior surface. Shortest bristles abundant on venter. Understory of fine setae absent. Genitalia. Sclerous lip of epigynum straight.

Etymology. The species is named in recognition of Dr Michael R. Gray, arachnologist and one time head Division of Invertebrate Zoology, Australian Museum, Sydney and collector of type material of this spider.

Distribution and natural history. ( Fig. 24D View Fig ) Known only from the type locality, cave entrance approximately 7 km WSW of the town of Dungog, N.S.W.

Burrow entrance with lid conserved: Dry collection AM KS86204, from type locality   .

The collector of the type specimens reports the burrows excavated were from damp mud walls in dark zone near cave entrance. The trapdoor opens downwards, spider rests on door when hunting ( Fig. 20I View Fig ). Trapdoor is of mud, plug-like.

One of us ( GW) has been made aware (H. Smith, pers. comm., 13 July 2007) of a 1922 record of burrows with similar entrances to that described above and situated at Wootton, NSW, about 60 km East of the type locality of M. grayi   ( Papers of Sidney William Jackson , National Library of Australia, MS466, Series 3 Field trip books, 1908–1922, Folder 167–171, Woolton (sic) and Wallis Lake Trip , 26 September–2 December 1922). More burrows have now been found in the Wootton locality ( GW, 3 Aug. 2007, Coolongolook River , Wootton, N.S.W., 100 m North of bridge, on West bank [32°17'48"S 152°17'55"E]) and are as described by Jackson ( Fig. 20J View Fig ). The identity of the spider has not been determined GoogleMaps   .

Wishart & Rowell: Trapdoor Spiders of eastern NSW 79

AM

Australian Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Idiopidae

Genus

Misgolas