New Australian Taxa

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ISSN: 2200-####

IMPORTANT NOTE:

This is an unpublished draft. Please do not distribute.

Paper Title

Synsphyronus tenuis, sp. nov.

 

MATERIAL EXAMINED

Holotype

AUSTRALIA: Western Australia: ♂, Kalbarri National Park, The Loop Trail, 27°33’02”S, 114°26’49”E, 16 August 2016, under sandstone rocks, M.S. Harvey, M.E. Blosfelds (WAM T141121).

 

Paratypes

AUSTRALIA: Western Australia: 1 ♂, 5 ♀, 2 deutonymphs, 1 protonymph, collected with holotype (WAM T140395–T140403).

 

OTHER MATERIAL

AUSTRALIA: Western Australia: 1 ♀, collected with holotype (WAM T141122); 1 ♀, collected with holotype (WAM T141123); 1 ♀, 3 tritonymphs, 1 deutonymph, Kalbarri National Park, Nature's Window Trail, 27°32’58.1”S, 114°26’55.0”E, 14 August 2012, under sandstone rocks, J.M. Waldock, K. Brimmell (WAM T127597, T140417–140420).

DIAGNOSIS

Synsphyronus tenuis most closely resembles those species of the genus that have fused metatarsi and tarsi (Figures #), all of which are from Australia: S. callus Hoff, 1947, S. ejuncidus Harvey, 1987, S. hadronennus Harvey, 1987, S. heptatrichus Harvey, 1987, S. meganennus Harvey, 1987, S. mimetus Chamberlin, 1943 and S. paradoxus Chamberlin, 1930. It differs from all of these species by the extremely long and narrow pedipalpal chela, which is 1.840–1.855 (♂), 1.870–2.130 (♀) mm long, and 6.46–6.63 (♂), 5.75‒6.09 (♀) × longer than broad (Figures #) and the shape of the chelal teeth which are strongly retrorse (Figures #). It further differs from S. hadronennus, S. heptatrichus, S. meganennus and S. paradoxus by the broad anterior eye (Figure #) (narrowed in the others) and from S. callus, S. heptatrichus, S. mimetus and S. paradoxus by the presence of three trichobothria on the movable chelal finger (Figure #) (one or two trichobothria in the others).

DESCRIPTION

Adults

Colour: most sclerotized portions yellow-brown (Figures #‒#, #‒#); tergites IV‒X and sternites V‒X with paired darker patches. Waxy epicuticle. Setae generally aligned perpendicularly from body, most seta quadricarinate. Most cuticular surfaces roughened, but not granulate.

 

Chelicera: with 5 setae on hand and 1 subdistal seta on movable finger, all setae acuminate; setae sbs and bs shorter than others; 2 dorsal lyrifissures and 1 ventral lyrifissure; galea of ♂ and ♀ unbranched; rallum of 3 blades, all blades with spinules on leading edge (Figure #); serrula exterior with 18 (♂, ♀) blades; lamina exterior present.

 

Pedipalp (Figure #): trochanter 1.67 (♂), 1.57 (♀), femur 5.29‒5.60 (♂), 5.23‒5.85 (♀), patella 3.87‒4.08 (♂), 3.85‒4.14 (♀), chela (with pedicel) 6.46‒6.63 (♂), 5.75‒6.09 (♀), chela (without pedicel) 6.09‒6.24 (♂), 5.46–5.98 (♀), hand 3.14‒3.38 (♂), 2.74–3.05 (♀) × longer than broad, movable finger 0.88‒0.93 (♂), 0.91‒1.00 (♀) × longer than hand (without pedicel). Fixed chelal finger with 8 trichobothria, movable chelal finger with 3 trichobothria (Figure #): eb, esb and isb situated basally in straight row, est submedially, etsubdistally, ib and ist basally in diagonal row, and it subdistally, well posterior to et; stsituated slightly closer to sb than to t; patch of microsetae present on external margin of fixed chelal finger slightly distal to et. Venom apparatus present in both chelal fingers, nodus ramosus not visible. Chelal teeth strongly retrorse, most teeth with pointed tips, but basal teeth of movable finger rounded; fixed finger with 46 (♂), 49 (♀) teeth; movable finger with 35 (♂), 41 (♀) teeth; accessory teeth absent.

 

Carapace (Figures #, #, #): 0.86‒0.91 (♂), 0.81‒0.86 (♀) × longer than broad; anterior margin slightly indented medially; subtriangular; with 2 pairs of corneate eyes (Figure #) situated ca. one-third carapace length from anterior margin; anterior eye broad and rounded; with 20 (♂, ♀) setae, including 2 (♂), 2 (♀) near anterior margin and 2 (♂), 3 (♀) near posterior margin; with numerous lyrifissures; with faint posterior furrow.

 

Coxal region: manducatory process rounded, with 3 (♂, ♀) apical acuminate setae, plus 9 (♂), 8 (♀) additional setae; medial maxillary lyrifissure situated submedially; chaetotaxy of coxae I–IV: ♂, 3: 6: 5: 5; ♀, 3: 4: 7: 11.

 

Legs: junction between femora and patellae I and II slightly oblique to long axis; junction between femora and patellae III and IV very angulate; femora III and IV much smaller than patellae III and IV (Figure #); femur + patella of leg IV 3.55 (♂), 4.11 (♀) × longer than broad; metatarsi and tarsi not fused and without tactile seta (Figures #); subterminal tarsal setae arcuate and acute; arolium much longer than claws, not divided.

 

Abdomen: tergites II–X (♂, ♀) and sternite IV (♂) with thin median suture line, V‒X (♂, ♀) with thin suture line in anterior half of sclerite (Figures #, #, #, #). Tergal chaetotaxy: ♂, 4: 4: 4: 4: 6: 6: 8: 6: 6: 4: 2: 2; ♀, 3: 4: 4: 4: 6: 6: 7: 8: 7: 7: 2: 2; uniseriate; all setae quadricarinate. Sternal chaetotaxy: ♂, 5: (0) 6 [4 + 4] (0): (0) 6 (0): 6: 4: 6: 8: 6: 6: 4: 2; ♀, 4: (0) 8 (0): (0) 6 (0): 8: 8: 7: 8: 8: 6: 4: 2; uniseriate; all setae quadricarinate except for those on sternite II and median pair of setae on sternite III (♂), and sternites II–IV (♀), which are acuminate. Spiracles without helix. Anal plates (tergite XII and sternite XII) situated within sternite XI, surrounded by slightly raised rim. Pleural membrane wrinkled-plicate; without any setae.

 

Genitalia: male: lateral apodeme laterally extended and distally broadened; anterior apodeme acute; a pair of acute dorsal apodemes; lateral rod very broad ventrally and with a blunt, anterior projection; ejaculatory canal atrium large and cup-shaped. Female: with one pair of lateral cribriform plates and 2 pairs of median cribriform plates.

 

Dimensions (mm): holotype male, followed by 1 other male (when measured): body length 3.44 (3.74). Pedipalps: trochanter 0.510/0.305, femur 1.400/0.250 (1.375/0.260), patella 1.040/0.255 (1.025/0.265), chela (with pedicel) 1.855/0.280 (1.840/0.285), chela (without pedicel) 1.760 (1.735), hand (without pedicel) length 0.945 (0.895), movable finger length 0.835 (0.830). Carapace 0.970/1.065 (1.000/1.160); eye diameter, anterior 0.090, posterior 0.070. Leg I: femur 0.320/0.145, patella 0.340/0.175, tibia 0.425/0.100, tarsus 0.340/0.0.075. Leg IV: femur + patella 0.870/0.245, tibia 0.625/0.120, tarsus 0.415/0.095.

 

Dimensions (mm), paratype female (WAM T140397), followed by 4 other females (when measured): body length 3.97 (3.66–4.29). Pedipalps: trochanter 0.565/0.360, femur 1.465/0.280 (1.385‒1.520/0.250–0.285), patella 1.135/0.295 (1.030–1.180/0.255–0.285), chela (with pedicel) 1.985/0.345 (1.870–2.130/0.320–0.350), chela (without pedicel) 1.885 (1.800–1.985), hand (without pedicel) length 0.945 (0.900–1.040), movable finger length 0.945 (0.880–0.960). Carapace 1.040/1.235 (1.000–1.105/1.185–1.345); eye diameter, anterior 0.070, posterior 0.075. Leg I: femur 0.365/0.155, patella 0.365/0.185, tibia 0.455/0.095, tarsus 0.390/0.085. Leg IV: femur + patella 0.945/0.230, tibia 0.690/0.125, tarsus 0.450/0.100.

 

Tritonymph

Colour: pale brown, most tergites and sternites with paired spots; carapace and pedipalps slightly darker than abdomen.

 

Chelicera: with 5 setae on hand and 1 on movable finger; galea unbranched.

 

Pedipalp: trochanter 1.67, femur 4.72, patella 3.32, chela (with pedicel) 5.18, chela (without pedicel) 4.93, hand (without pedicel) 2.53 × longer than broad, and movable finger 0.96 × longer than hand (without pedicel). Fixed chelal finger with 7 trichobothria, movable chelal finger with 2 trichobothria (Figure #): eb, esb, istand ib situated basally; est situated medially; et and itsubdistally; b subbasally; t submedially.

 

Carapace: 0.88 × longer than broad; with 18 setae including 2 setae near anterior margin and 4 near posterior margin.

 

Coxal region: manducatory process with 3 apical acuminate setae, pedipalpal coxa with 7 additional setae; chaetotaxy of coxae I–IV: 2: 3: 4: 5.

 

Legs: metatarsi and tarsi fused.

 

Abdomen: tergal chaetotaxy: 4: 4: 4: 4: 5: 6: 7: 7: 6: 5: 2: 2. Sternal chaetotaxy: 0: (0) 5 (0): (0) 4 (0): 8: 7: 6: 6: 7: 6: 2: 2.

 

Dimensions (mm) (WAM T140417): body length 3.03. Pedipalps: trochanter 0.500/0.300, femur 1.110/0.235, patella 0.830/0.250, chela (with pedicel) 1.555/0.300, chela (without pedicel) 1.480, hand length (without pedicel) 0.760, movable finger length 0.730. Carapace 0.880/0.9950.

 

Deutonymph

Colour: pale yellow-brown, most tergites and sternites with paired spots; carapace and pedipalps slightly darker than abdomen.

 

Chelicera: with 5 setae on hand and 1 on movable finger; galea unbranched.

 

Pedipalp: trochanter 1.56, femur 3.91, patella 2.71, chela (with pedicel) 4.81, chela (without pedicel) 4.44, hand (without pedicel) 2.03 × longer than broad, and movable finger 1.17 × longer than hand (without pedicel). Fixed chelal finger with 6 trichobothria, movable chelal finger with 2 trichobothria (Figure #): eb, ist and ibsituated basally; est situated medially; et and itsubdistally; b subbasally; t subdistally.

 

Carapace: 0.80 × longer than broad; with 17 setae including 2 setae near anterior margin and 3 near posterior margin.

 

Coxal region: manducatory process with 3 apical acuminate setae, pedipalpal coxa with 6 additional setae; chaetotaxy of coxae I–IV: 2: 3: 3: 4.

 

Legs: metatarsi and tarsi fused.

 

Abdomen: tergal chaetotaxy: 4: 4: 4: 4: 4: 5: 5: 5: 6: 6: 2: 2. Sternal chaetotaxy: 0: (0) 2 (0): (0) 2 (0): 4: 4: 4: 6: 6: 6: 4: 2.

 

Dimensions (mm) (WAM T140401): body length 2.72. Pedipalps: trochanter 0.405/0.260, femur 0.900/0.230, patella 0.665/0.245, chela (with pedicel) 1.420/0.295, chela (without pedicel) 1.310, hand length (without pedicel) 0.600, movable finger length 0.700. Carapace 0.745/0.930.

 

Protonymph: colour: pale yellow-brown.

 

Chelicera: with 4 setae on hand and 0 on movable finger; galea unbranched.

 

Pedipalp: trochanter 1.76, femur 3.50, patella 2.31, chela (with pedicel) 4.02, chela (without pedicel) 3.84, hand (without pedicel) 1.71 × longer than broad, and movable finger 1.26 × longer than hand (without pedicel). Fixed chelal finger with 3 trichobothria, movable chelal finger with 1 trichobothria (Figure #): eb and istsituated basally; et situated sub-medially; t situated sub-medially.

 

Carapace: 0.80 × longer than broad.

 

Coxal region: manducatory process with 2 apical acuminate setae, pedipalpal coxa with 2 additional setae; chaetotaxy of coxae I–IV: 1: 1: 1: 1.

 

Legs: metatarsi and tarsi fused.

 

Abdomen: tergal chaetotaxy: 2: 4: 4: 4: 4: 4: 4: 4: 4: 4: 4: 2. Sternal chaetotaxy: 0: (0) 2 (0): (0) 2 (0): 2: 2: 2: 2: 2: 2: 2: 2.

 

Dimensions (mm) (WAM T140403): Body length 2.335. Pedipalps: trochanter 0.325/0.185, femur 0.665/0.190, patella 0.485/0.210, chela (with pedicel) 1.025/0.255, chela (without pedicel) 0.980, hand length (without pedicel) 0.435, movable finger length 0.550. Carapace 0.590/0.735.

6 specimens, Kalbarri National Park, Nature's Window Trail, 27°32’58.1”S, 114°26’55.0”E, 14 August 2012, under sandstone rocks, J.M. Waldock, K. Brimmell (WAM T127596 [MH1]); NOT YET LOCATED