Austrochilus parwis, Wunderlich, 2017

Wunderlich, Joerg, 2017, The spider genus Austrochilus Gertsch & Zapfe, 1955 (Araneae: Austrochilidae) - a new species from Chile and a documentation of the male genitalia of austrochilines, Zootaxa 4312 (2), pp. 323-332: 325-327

publication ID

https://doi.org/10.11646/zootaxa.4312.2.7

publication LSID

lsid:zoobank.org:pub:Fa86F3B2-24E3-4306-9Fc7-C6585146C679

persistent identifier

http://treatment.plazi.org/id/03EFE43F-FF88-FF8A-F2F6-A5027B9FFCF0

treatment provided by

Plazi

scientific name

Austrochilus parwis
status

sp. n.

Austrochilus parwis   sp. n.

( Figs 1–13 View FIGURES 1 – 3 View FIGURES 4 – 6 View FIGURES 7 – 13 )

Type material. Male holotype and three female paratypes from Chile, Region IX (Araucanía), west of Angol, 10 km around the Nahuelbuta National Park , 900 m, margin of the forest, collected at night, 15 February 2002, leg. Parwis Nabavi, deposited in MNHNC and ZIMG (holotype MNHNC-8020; paratypes ZIMG II-28327-28329).  

Other material examined. CHILE: Region IX (Araucanía): Same data as the types (1 female deposited in SMF; 2 penultimate males in ZSM; 1 female, 1 penultimate male in BMNH; 1 female, 3 penultimate males in CJW; 2 females, 4 penultimate males in ZIMG).  

Derivatio nominis: The species epithet is a noun in apposition in honour of the collector of the type material, Parwis Nabavi (Freiburg, Germany).

Diagnosis. General body appearance as in other Austrochilus   species ( Fig. 1 View FIGURES 1 – 3 ), and similar to A. forsteri   by the clypeal height (around 3–3.5 x the diameter of AME) ( Figs 2, 3 View FIGURES 1 – 3 ; see also Grismado et al. 2003, p. 149). Males of A. parwis   sp. n. resemble those of the remaining congeners by the general morphology of the copulatory bulb, with a median apophysis of similar length to the embolus ( Figs 4 View FIGURES 4 – 6 , 14–19 View FIGURES 14 – 17 View FIGURES 18 – 21 ), but clearly differ by the hook-shaped tip of the tegulum and the shape of the subtegulum ( Figs 4 View FIGURES 4 – 6 , 14–19 View FIGURES 14 – 17 View FIGURES 18 – 21 ; see also Forster et al. 1987, figs 124, 130, 136, 142, 148; Grismado et al. 2003, fig. 1). The shape of subtegulum, median apophysis and conductor are similar to A. forsteri   , but the subtegular process is more slender in A. parwis   sp. n. and the dorsal hump on the prolateral side of the subtegulum is less prominent ( Figs 4–6 View FIGURES 4 – 6 , 19 View FIGURES 18 – 21 ; see also Grismado et al. 2003, fig. 1). The female genitalia have a prominent scape (‘anterior knob’ sensu Forster et al. 1987) as in A. franckei   , A. newtoni   and A. forsteri   , but this is more rounded in A. parwis   sp. n. ( Figs 7, 8 View FIGURES 7 – 13 ; see also Forster et al. 1987, figs 145, 151; Grismado et al. 2003, fig. 4). The internal genitalia are most similar to A. forsteri   , but the lateral lobes are longer, distally curved and connected to the anterior lobe ( Fig. 9 View FIGURES 7 – 13 ; see also Grismado et al. 2003, fig. 6).

Description. Male (holotype, MNHNC-8020). Total length 8.2. Prosoma 4.5 long, 3.4 wide. Leg formula: 1243. Leg measurements: total length (femur/patella/tibia/metatarsus/tarsus): I 29.6 (7.5/1.9/8.5/8.3/3.4), tibia II 6.8, tibia III 3.8, tibia IV 5.8, pedipalpal femur 2.5. Coloration: Prosoma mainly light brownish, darkened medially and laterally, sternum brown, legs medium brown, opisthosoma mainly dark grey brown, book lungs and tracheal patches yellow. Prosoma: 1.32 x longer than wide; cuticule smooth, with feathery hairs similar to those on the pedipalpal and leg articles; fovea well developed; posterior row of eyes distinctly procurved, AME 0.15, ALE 0.27, PME 0.24, PLE 0.25, clypeus height at midline 0.45 (= three times the diameter of AME); basal cheliceral article large, promargin with five large teeth, retromargin with denticles on a hump, laterally with a small field of stridulatory files, fangs large in an oblique position. Legs: long, numerous bristles of medium length, single lined calamistrum in the middle third of metatarsus IV. Opisthosoma: oval, covered with short hairs, cribellum large and undivided. Pedipalp ( Figs 4–6 View FIGURES 4 – 6 ): Trochanter proventrally with a blunt stridulatory outgrowth facing the stridulatory files (no pick); tibia with two irregular rows of more than a dozen long trichobothria and feathery hairs; cymbium long and slender, subtegulum with large hook-like retrolateral process, and dorsal hump on prolateral side ( Fig. 4 View FIGURES 4 – 6 , arrowhead), tegulum with a blunt hook-like tip, median apophysis slender and weakly sclerotized in basal half, embolus large with retrolateral sclerotized tip, distal part of spermophor clearly visible ( Fig. 4 View FIGURES 4 – 6 , arrow). Note that the prosoma of the holotype is dorsally compressed and the right legs I and II are missing.

Female. Similar to male but larger, the stridulatory files slightly corniculate and without a distinct hump on the pedipalpal trochanter. Total length 11–14, prosoma 5.5–6.2 long, 4.2–5.3 wide; leg I 8.2/2.5/9.8/8.7/3.8, tibia II 6.9, tibia III 4.5, tibia IV 6.0, pedipalpal tarsus 2.5. Eyes and clypeus variable, clypeus at midline 2.6–4.5 x diameter of AME. Pedipalp large and spiny, tarsal claw well developed, toothed. Genitalia ( Figs 7–13 View FIGURES 7 – 13 ): scape prominent and rounded, extending over epigastric furrow, cuticle anterior to scape folded ( Fig. 11 View FIGURES 7 – 13 ); genital opening with strong and large sclerotized area (=transversal plate sensu Forster et al. 1987) with ridge-like sclerotization pattern laterally ( Figs 10, 11 View FIGURES 7 – 13 ), anterior lobe (aL) weakly sclerotized anteriorly and with strongly sclerotized plate (aP) ( Figs 11, 12 View FIGURES 7 – 13 ), long, curved lateral lobes (LL) connecting the anterior lobe with the basis of the uterus externus ( Figs 9, 13 View FIGURES 7 – 13 ).

Distribution. Known only from type locality.

ZIMG

Zoologisches Institut und Museum Greifswald

SMF

Forschungsinstitut und Natur-Museum Senckenberg

ZSM

Bavarian State Collection of Zoology