Stephanopis arenata Machado

Machado, Miguel, Teixeira, Renato Augusto & Milledge, Graham A., 2019, On the Australian Bark Crab Spider Genus Stephanopis: Taxonomic Review and Description of Seven New Species (Araneae: Thomisidae: Stephanopinae), Records of the Australian Museum 71 (6), pp. 217-276: 228-230

publication ID

http://doi.org/ 10.3853/j.2201-4349.71.2019.1698

publication LSID

lsid:zoobank.org:pub:7EDBAB7F-0E3B-47D7-AA29-0906728ADA05

persistent identifier

http://treatment.plazi.org/id/308FC57E-3514-4687-804B-C623DBF5A92C

taxon LSID

lsid:zoobank.org:act:308FC57E-3514-4687-804B-C623DBF5A92C

treatment provided by

Felipe

scientific name

Stephanopis arenata Machado
status

sp. nov.

Stephanopis arenata Machado   sp. nov.

http://zoobank.org/NomenclaturalActs/ 308FC57E-3514-4687-804B-C623DBF5A92C

Figs 6–7 View Figure 6 View Figure 7

Holotype ♀, AMS KS.128001, Scotia Sanctuary , New South Wales, Australia, 33°07'36"S 141°10' 40"E, H. Gibb, February 2009, (designated here) GoogleMaps   . Paratypes: AMS KS.66762, 1♂, Lower Murray-Darling Region (Warrakoo Station), New South Wales, Australia, 33°51'16"S 141°07'06"E, M. Lebreton, 12–16 October 1998 GoogleMaps   ; AMS KS.50784, 1♂, Simpson Desert (Ethabuka station), Queensland, Australia, 23°45'S 138°28'E, H. Wilson, July 1997 GoogleMaps   .

Other material examined. Queensland: QM S35214 View Materials , 2♀♀, Westmar, 27°54'45.98"S 149°2'30.56"E, V. Davies, T. Adams & R. Raven, 10 January 1979 GoogleMaps   . Western Australia:

WAM T130261, 1♀, 16.5 km southeast of Pannawonica Fortescue River Valley , 21°41'38"S 116°28'24"E, F. Bokhari, 10 September 2012 GoogleMaps   ; WAM T146672, 1♀, Goldfields Survey (dune shrubland), 32°23'15"S 119°45'00"E GoogleMaps   .

Diagnosis. Females of S. arenata   sp. nov. and S. cambridgei   have a predominantly orange body colouration and the external shape of their epigynum is similar, with CO hidden by the lateral folds of the plate ( Fig. 6A, C and D View Figure 6 ). Still, females of S. arenata   sp. nov. can be distinguished from S. cambridgei   by their complete atrium delimited anteriorly by the folds of the epigynal plate, and copulatory ducts sclerotized and not coiled. Males are similar to those of S. cambridgei   due to their striped legs ( Fig. 7A View Figure 7 ), single and curved RTA ( Fig 7C and 7D View Figure 7 ) and the tibiae and metatarsi I bearing long and thin barbs ( Fig 7A View Figure 7 ); male palp can be also distinguished by the bent/tilted cymbium and shorter embolus ( Fig. 7C View Figure 7 ). Moreover, as this species occurs in desertic areas, it can be undoubtedly recognized due to the grains of sand, rock fragments and other soil particles attached to their bodies ( Figs 6A View Figure 6 and 7A View Figure 7 ).

Description. Female (AMS KS.128001): Anterior eyes arranged in a strongly recurved row and posterior eyes in straight row; cephalic area narrowed ( Fig. 6A and B View Figure 6 ); body predominantly dark orange and covered in grains of sand and thick bacillar setae. Legs striped; femur I with pair of prolateral macrosetae. Opisthosoma slightly wider than long and copulatory ducts asymmetrically coiled; anterior chamber absent and glandular-heads reduced, dorsally oriented ( Fig. 6D View Figure 6 ).

Measurements: eye diameters and interdistances: AME 0.06, ALE 0.12, PME 0.10, PLE 0.10, AME–AME 0.08, AME–ALE 0.04, PME–PME 0.14, PME–PLE 0.12, MOQ length 0.36, width 0.28; leg formula: 1-2-4-3: leg I—femur 3.39/ patella 1.07/ tibia 2.20/ metatarsus 1.26/ tarsus 0.65/ total 8.57; II—1.89/ 0.79/ 1.40/ 1.13/ 0.44 5.65; III—1.23/ 0.55/ 1.64/ 0.61/ 0.52/ 4.55; IV—1.75/ 0.62/ 1.14/ 1.11/ 0.63/ 5.25. Total body length 5.97; prosoma length 2.59, width 2.37; opisthosoma length 3.38; clypeus height 0.47; sternum length 1.16, width 1.16; gnathocoxae length 0.43, width 0.24; labium length 0.25, width 0.39.

Male (AMS KS.66762): Prosoma and opisthosoma lightorange ( Fig. 7B View Figure 7 ), leg segments (except tibiae, metatarsi and tarsi I and II) yellow with dark-brown annuli ( Fig. 7A View Figure 7 ); Pcym reduced, hyaline and placed at same height as tip of the RTA ( Fig. 7C View Figure 7 ). Other somatic features as in female.

Measurements: eye diameters and interdistances: AME 0.07, ALE 0.18, PME 0.09, PLE 0.10, AME–AME 0.11, AME–ALE 0.05, PME–PME 0.16, PME–PLE 0.16, MOQ

length 0.32, width 0.23; leg formula: 1-2-4-3: leg I—femur 3.23/ patella 1.11/ tibia 3.26/ metatarsus 1.94/ tarsus 0.73/ total 10.27; II—2.26/ 0.79/ 1.94/ 1.44/ 0.71/ 7.14; III—1.45/ 0.60/ 1.05/ 0.86/ 0.57/ 4.53; IV—2.28/ 0.68/ 1.59/ 1.48/ 0.67/ 6.70. Total body length 7.14; prosoma length 2.63, width 2.41; opisthosoma length 2.75; clypeus height 0.44; sternum length 1.14, width 1.16; gnathocoxae length 0.48, width 0.29; labium length 0.38, width 0.40.

Etymology. The specific epithet derives from the feminine Latin noun “ arena ”, which means sand; the word “ arenata   ” means covered with sand.

Distribution. Western Australia and New South Wales, Australia ( Fig. 13 View Figure 13 ).

QM

Queensland Museum

V

Royal British Columbia Museum - Herbarium

T

Tavera, Department of Geology and Geophysics

R

Departamento de Geologia, Universidad de Chile

WAM

Western Australian Museum