Olgania troglodytes Rix &amp; Harvey 2010, sp. n.
Creators: name: Rix, Michael
name: Harvey, Mark
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Micropholcommatidae
Olgania
Olgania troglodytes

description: <i>Olgania troglodytes</i> Rix &amp; Harvey, sp. n. urn:lsid:zoobank.org:act: 12301C34-1B39-4A2A-AC50-A018051969AB Figs 178C, 179D, 184–185, 213 <b>Type material.</b> Holotype male: <i>Revelation Cave</i> (IB-1), Ida Bay karst, Tasmania, Australia, under sheet webs on wall of side chamber upslope from main cave passage, c. 40 m below surface (dark zone), 25.III.1989, A. Clarke (AMS KS32002). Paratypes: Allotype female, same data as holotype (AMS KS97163); 1 male and 3 females, same data as holotype (AMS KS97164). <b>Other material examined.</b> <b>AUSTRALIA: Tasmania:</b> <i>Arthurs Folly</i> (1B-110), Ida Bay karst, in sheet web on moist wall c. 2 m above stream (dark zone), before rockfall section c. 200 m from entrance, 43°24'S, 146°52'E, 20.XI.1986, A. Clarke, S. Eberhard, 1♁, 2&amp;female; (AMNH); <i>Bradley-Chesterman Cave</i> (IB-4), Ida Bay karst, from sheet webs (twilight zone), 43°24'S, 146°52'E, 22.III.1990, S. Eberhard, 4&amp;female; (QVM 13: 13223); <i>Dismal Hill Pot</i> (IB-128), Ida Bay karst, webs near leaf litter at ̴ 90 m below surface (dark zone), 9.VIII.1987, S. Eberhard, 2♁ (AMS KS20185); <i>Little Grunt</i> (IB-23), Ida Bay karst, 43°24'S, 146°52'E, from webs on cave ceiling (dark zone), 16. IV.1990, S. Eberhard, 1&amp;female; (QVM 13: 13066); same data except webs on dry cave wall, 20.XI.1990, 2&amp;female; (QVM 13: 12768); <i>Loons Cave</i> (IB-2), Ida Bay karst, sheet webs (from near litter or in mud cracks) near aven (dark zone), 10.V.1989, S. Eberhard, J. Jackson, 1♁, 2&amp;female; (AMS KS29595); same data except in sheet webs deep in cave (dark zone), 2&amp;female; (QVM 13: 12665); <i>March Fly Pot</i> (IB-46), Ida Bay karst, from sheet-webs on walls in lower chamber (dark zone), 43°24'S, 146°52'E, 23.III.1990, S. Eberhard, 2♁, 2&amp;female; (QVM 13: 13303); <i>Pseudocheirus Cave</i> (IB-97), Ida Bay karst, 4.V.1990, S. Eberhard, 3♁, 7&amp;female; (QVM 13: 12851); <i>Straw Cave</i> (IB-91), Ida Bay karst, from sheet webs deep in cave (dark zone), 43°24'S, 146°52'E, 5.IV.1990, S. Eberhard, 1&amp;female; (QVM 13: 13268); <i>Thun Junction</i> (IB-20), Ida Bay karst, from horizontal web in crevice of aven wall at c. 35 m depth, 125 m from entrance (dark zone), 24.III.1989, A. Clarke, 2&amp;female; (AMS KS32011). <b>Etymology.</b> The specific epithet is derived from the Greek ‘trogle’, meaning ‘hole’, and the Greek ‘dytes’, meaning ‘enterer’ (Brown 1956), and refers to the cave-dwelling nature of this species. <b>Diagnosis.</b> Males of <i>Olgania troglodytes</i> can be distinguished from all other described congeners except <i>O. cracroft</i> by the absence of prolateral, thorn-like macrosetae on the male pedipalpal tibia; and from <i>O. cracroft</i> by the shorter, looped embolus (Fig. 185). Females can be distinguished from all other described congeners by the distinctive shape of the receptacula (Fig. 178C). <b>Description.</b> <i>Holotype male</i>: Total length 0.94. Carapace 0.42 long, 0.41 wide. Abdomen 0.63 long, 0.47 wide. Leg I femur 0.76. Cephalothorax, abdominal sclerites tan-yellow; legs pale tan-yellow; abdomen cream. Carapace raised anteriorly, fused to sternum via pleural sclerites; dorsal surface of pars cephalica strongly convex in lateral view; carapace and sternum heavily punctate. Eyes absent, except for single, barely-visible vestigial eye spot on each side of pars cephalica. Chelicerae without bulging anterior projections; promargin without peg teeth. Legs relatively long (leg I femur-carapace ratio 1.81); macrosetae absent. Abdomen subtriangular-globose, covered with hair-like setae, each seta projecting from small sclerotic spot; dorsal scute and lateral sclerotic strips absent. Pedipalpal patella with retrolaterally-directed, hooked lRPA, strongly recurved distal apophysis and additional, flange-like distal process; tibia without thorn-like macrosetae; tegulum smooth, with curved, marginal ETR; embolus long (length&gt; 5× width), looping around prolateral margin of bulb (Fig. 185). <i>Allotype female</i>: Total length 0.96. Carapace 0.46 long, 0.42 wide. Abdomen 0.67 long, 0.54 wide. Leg I femur 0.78. Cephalothorax, abdominal sclerites tan-yellow; legs pale tan-yellow; abdomen cream. Carapace raised anteriorly, fused to sternum via pleural sclerites; dorsal surface of pars cephalica strongly convex in lateral view; carapace and sternum heavily punctate. Eyes absent, except for single, barely-visible vestigial eye spot on each side of pars cephalica. Chelicerae without bulging anterior projections; promargin without peg teeth. Legs relatively long (leg I femur-carapace ratio 1.70); macrosetae absent. Abdomen subtriangular, covered with hair-like setae, each seta projecting from small sclerotic spot; dorsal scute and lateral sclerotic strips absent. Pedipalp entire, five-segmented. Epigyne with distinctive external morphology (Fig. 184D); receptacula globular, with coiled internal ducts; insemination ducts looped; fertilisation ducts simple, curved (Fig. 178C). <b>Distribution.</b> Known only from caves in the Ida Bay karst of southern Tasmania, including <i>Arthurs Folly</i>, <i>Bradley-Chesterman Cave</i>, <i>Dismal Hill Pot</i>, <i>Little Grunt</i>, <i>Loons Cave</i>, <i>March Fly Pot</i>, <i>Pseudocheirus Cave</i>, <i>Revelation Cave</i>, <i>Straw Cave</i> and <i>Thun</i> <i>Junction</i> (Fig. 213). <b>Remarks.</b> <i>Olgania troglodytes</i> is a distinctive, blind and long-legged species known from at least 10 caves in the Ida Bay karst of southern Tasmania. It is among the most troglomorphic of any Micropholcommatidae, and is most similar to <i>O. cracroft</i> from the nearby Cracroft karst (Fig. 179). Nothing is known of its biology or conservation status, except that specimens were collected from horizontal sheet-webs on the walls of caves.
description: Published as part of <i>Rix, Michael &amp; Harvey, Mark, 2010, The spider family Micropholcommatidae (Arachnida: Araneae: Araneoidea): a relimitation and revision at the generic level, pp. 1-321 in ZooKeys 36 (36)</i> on pages 94-96, DOI: 10.3897/zookeys.36.306, http://zenodo.org/record/576620
description: {"references": ["Brown RW (1956) Composition of Scientific Words: A Manual of Methods and a Lexicon of Materials for the Practice of Logotechnics. Smithsonian Books, Washington, DC, 882 pp."]}