Misgolas dereki Wishart, 1992

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: 35-36

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

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Misgolas dereki Wishart, 1992


Misgolas dereki Wishart, 1992  

Figs 1A–O View Fig , 14B View Fig

Misgolas dereki Wishart, 1992: 266–269   .

Material examined. NEW SOUTH WALES: holotype ♂, AMS KS22326, “Scalloway”, Willow Vale, nr Gerringong , NSW (34°44'11"S 150°47'23"E), 17 Oct. 1985, GW. Allotype ♀, AMS KS22327, 13 Jan. 1986, other details as for AMS KS22326. GoogleMaps  

The following material, also from New South Wales, also examined: ♂♂ AMS KS3644, Mt Keira Scout Camp, Wollongong (34°24'S 150°51'E), 14 Mar. 1979, M Gray & C Horseman. AMS KS30875, Dapto, NSW (34°30'S 150°47'E), 24 Mar. 1992.AMS KS38618, “Lightwood Park” Williams Rd, Jamberoo, NSW (34°36'46"S 150°47'27"E), 4 Apr. 1988, S Meredith. AMS KS38619, 30 Apr. 1988, other details as for AMS KS38618. AMS KS48700, Wiarborough nr Taralga, NSW (34°12'S 149°54'E), 15 Apr. 1968, G. Cosgrove. AMS KS92890, 30 Apr.1988, other details as for AMS KS38618.AMS KS92891, 30 Apr. 1988, other details as for AMS KS38618. AMS KS92892, 4 Apr. 1988, other details as for AMS KS38618 GoogleMaps   .

Diagnosis. Specimens located south of approximately latitude 34°38'S, includes type locality: in male & female: medium sized brown spiders, retrodorsal surface of metatarsi IV with spines ( Fig. 1F View Fig ). Venter pallid with sparse, scattered dark brown speckles distant from spinneret region ( Fig. 1D,G View Fig ). In female: carapace length c. 7.7–11.5. In male: carapace length c. 6.0–8.1. Embolus of bulb with small, dorsal, thorn-like apophysis placed about mid-way; retrolateral flange with three prominent folds, edge markedly curved ( Fig. 1B,C View Fig ). Conformation of palp and spination of cymbium as figured ( Fig. 1A,E View Fig ). Specimens found north of latitude 34°38'S: venter pallid with range of densities of dark brown speckles varying from pallid to entirely dark brown often adjacent to spinneret region ( Fig. 1H–L View Fig )   .

Remarks. Northwards from about a line represented by latitude 34°38'S some male specimens, though determined to be M. dereki   , exhibit variable venter patterns and rarely, four, rather than three, prominent folds on the retrolateral embolic flange of the male bulb. A consistent unifying character is the retrolateral embolic flange appearing inflated sail-like; edge markedly curved and with prominent folds.

The wandering times of mature male M. dereki   spiders from the type locality Wishart (1993) found almost all were collected during April to June of each year. This correlates approximately to the February-June period for the, albeit undisciplined, collection of 68 specimens from areas not included in the type locality, in particular the region north of latitude 34°38'S.

Typifying the variations of the venter pattern ( Fig. 1H–L View Fig ) are five male spiders all collected from the same in-ground home swimming pool during April, 1988. Consistent conformation of the palps and bulbs in these specimens supports these spiders being conspecific with M. dereki   , yet the venter patterns are variable. It appears that there is a southern group within the species M. dereki   whch exhibit consistent venter patterns and a northern group with inconsistent venter patterns. This is accepted as a natural genetic variation within this species which is fixed in most other Misgolas species.  

Distribution and natural history. ( Figs 1M–O View Fig , 14B View Fig ) This spider has been collected northwards from the Shoalhaven River to Mount Keira nr Wollongong and westwards to Wiarborough (34°12'S 149°54'E) nr Taralga. Burrow entrance collar-like, level with ground ( Fig. 1M–O View Fig ). Subterranean structure about 25 cm deep, lined with fragile silk tube terminating at soft but strong, 3.5 cm long sock in which spider, sometimes with spiderlings, is often found ( Wishart, 1992). Male spider wandering times most often during April-June each year ( Wishart, 1993).














Misgolas dereki Wishart, 1992

Wishart, Graham 2011

Misgolas dereki

Wishart, G 1992: 269