Eterosonycha aquilina Rix & Harvey

Rix, Michael & Harvey, Mark, 2010, The spider family Micropholcommatidae (Arachnida: Araneae: Araneoidea): a relimitation and revision at the generic level, ZooKeys 36 (36), pp. 1-321: 39-41

publication ID

http://doi.org/ 10.3897/zookeys.36.306

publication LSID

lsid:zoobank.org:pub:ADCACC88-6C78-4386-8E33-3F98234ECE92

DOI

http://doi.org/10.5281/zenodo.3789383

persistent identifier

http://treatment.plazi.org/id/7E13878E-FF90-1B53-FF32-1D8EFCC98CBD

treatment provided by

Plazi

scientific name

Eterosonycha aquilina Rix & Harvey
status

sp. n.

Eterosonycha aquilina Rix & Harvey   , sp. n.

urn:lsid:zoobank.org:act:5E16DE9E-BCF3-4C19-9ABF-882338D20396

Figs 7E View Figure 7 , 51C, 52–53

Type material. Holotype male: Yarra Ranges National Park , Mount Donna Buang, Victoria, Australia, Mountain Ash / Nothofagus   /fern forest, 37°42'36"S, 145°40'57"E, 19.IV.2006, M. Rix ( NMV K10766 View Materials ). GoogleMaps  

Paratypes: Allotype female, same data as holotype ( NMV K10767 View Materials ); 4 males and 10 females, same data as holotype ( WAM T94446 View Materials ) GoogleMaps   .

Other material examined. AUSTRALIA: Victoria: Acheron Gap, 16 km N. of Warburton, 750 m, Nothofagus   forest Berlese , 28–30.IV.1978, S. & J. Peck, 1♁ ( AMNH)   ; Alfred National Park, 200 m, temperate rainforest Berlese , bark and rotten logs, 21.V.1978, S. & J. Peck, 2♁, 4♀ ( AMNH)   ; Coranderrk Reserve, SE. of Healesville, 240 m, Berlese , forest litter, 13.I.1980, A. Newton, M. Thayer, 1♀ ( AMNH)   ; Otway Ranges, Beauchamp Falls , sifting moss, 38°39'07"S, 143°36'23"E, 24.IV.2006, M. Rix, 1♁, 1♀ ( WAM T94444 View Materials ) GoogleMaps   ; Great Otway National Park, track to Cora Lynn Cascades, near Lorne , sifting moss, 38°30'58"S, 143°55'45"E, 22.IV.2006, M. Rix, 4♁, 10♀ ( WAM T94445 View Materials ) GoogleMaps   ; Kalista, Sherbrooke Forest Park, 400–500 m, wet sclerophyll forest Berlese of forest litter, 15.I.1980, A. Newton, M. Thayer, 1♁, 1♀ ( AMNH)   ; Tarra-Bulga National Park, 550 m, Berlese , fungi on logs, 17.V.1978, S. & J. Peck, 6♀ ( AMNH)   ; 12 km E. of Warburton , 215 m, Eucalyptus   forest, dry moss on logs, 12–16.I.1980, A. Newton, M. Thayer, 3♀ ( AMNH)   ; Warburton , 500 m, Nothofagus   litter, 30.IV.1978, S. & J. Peck, 1♁ ( MCZ)   ; Warburton, Cement Creek, 670 m, Nothofagus cunninghamii   forest, Berlese , forest litter, 10–17.I.1980, A. Newton, M. Thayer, 1♁ ( AMNH)   ; same data, 1♀ ( AMNH)   ; Wingam Inlet National Park, Berlese , fungi and eucalypt bark, 23.V.1978, S. & J. Peck, 1♁ ( AMNH)   . New South Wales: Kosciusko National Park, Leather Barrel Creek , 1000 m, frass under bark, wet sclerophyll, 21.IV.1978, S. & J. Peck ( AMNH)   . Tasmania: 16 km NNW. of Bicheno, Douglas River , wet forest litter, 41°46'S, 148°14'E, 3.XI.1985, L. Hill, 2♀ ( QMB S6578) GoogleMaps   ; Cuckoo Falls, near Scottsdale , sifting moss, 41°14'13"S, 147°36'49"E, 26.IV.2006, M. Rix, 1♁, 10♀ ( WAM T94441 View Materials ) GoogleMaps   ; Mount Barrow Road , 890 m, Nothofagus Berlese   , forest litter, 15–17.II.1980, A. Newton, M. Thayer, 2♀ ( AMNH)   ; 4 km S. of Weldborough, 460 m, Nothofagus   forest Berlese , 12–14.II.1980, A. Newton, M. Thayer, 1♀ ( AMNH)   ; same data, 1♁ ( AMNH)   .

Etymology. The specific epithet is derived from the Latin ‘aquilinus’, meaning ‘of the eagle’ ( Brown 1956), and refers to the distinctive, eagle-like shape of the female epigyne of this species.

Diagnosis. Males of Eterosonycha aquilina   can be distinguished from all other described congeners by the shape of the distal conductor, which has a prominent, retrolaterally-directed process ( Fig. 53A View Figure 53 ). Females can be distinguished from all oth- er described congeners by the distinctive, ‘eagle-like’ shape of the external epigyne ( Fig. 52D View Figure 52 ).

Description. Holotype male: Total length 0.98. Carapace 0.47 long, 0.40 wide. Abdomen 0.66 long, 0.48 wide. Leg I femur 0.35. Cephalothorax, abdominal sclerites, legs tan-yellow; abdomen with chequered dark-olive and tan-yellow pattern laterally and ventrally. Carapace raised anteriorly, not fused to sternum except around petiole; dorsal surface of pars cephalica slightly convex in lateral view. Eight eyes present on anterior margin of pars cephalica; AME 0.6x diameter of ALE; PME separated by half their own diameter. Chelicerae each with large, bulging anterior projection; promargin with three peg teeth. Legs relatively short (leg I femur-carapace ratio 0.74); distal, prolateral macroseta present on tibia I. Abdomen oval, covered with hair-like setae; dorsal scute large, covering most of dorsal surface of abdomen; lateral sclerotic strips absent. Pedipalpal patella with retrolaterally-directed, hooked lRPA, divergent distal apophysis and expanded distal region with ornate, ridged cuticular microstructure; tibia enlarged, with pointed posterior process; tegulum large, bulging posteriorly, with excavate ETR and large, divergent, fleshy distal conductor bearing prominent, retrolaterally-directed process; embolus short (length <5× width), spur-like, situated adjacent to base of conductor ( Fig. 53 View Figure 53 ).

Allotype female: Total length 1.09. Carapace 0.49 long, 0.39 wide. Abdomen 0.74 long, 0.57 wide. Leg I femur 0.37. Cephalothorax, abdominal sclerites, legs tan-yellow; abdomen olive brown dorsally, with chequered dark-olive and tan-yellow pattern laterally and ventrally. Carapace raised anteriorly, not fused to sternum except around petiole; dorsal surface of pars cephalica slightly convex in lateral view. Eight eyes present on anterior margin of pars cephalica; AME 0.6x diameter of ALE; PME separated by slightly less than their own diameter. Chelicerae without bulging anterior projections; promargin without peg teeth. Legs relatively short (leg I femur-carapace ratio 0.76); macrosetae absent. Abdomen oval, covered with hair-like setae; dorsal scute and lateral sclerotic strips absent. Pedipalp entire, five-segmented. Epigyne heavily sclerotised externally, with distinctive ‘eagle-shaped’ morphology ( Fig. 52D View Figure 52 ); spermathecae looped and twisted; insemination ducts curved and looped anteriorly; fertilisation ducts filiform (Fig. 51C).

Distribution. Known from south-eastern Australia, in southern New South Wales, Victoria and Tasmania.

Remarks. Eterosonycha aquilina   is among the most distinctive of any Australian Textricellini   , with an unmistakeable external epigyne ( Fig. 52D View Figure 52 ) and male pedipalp ( Fig. 53 View Figure 53 ) morphology. It is common in moss and leaf litter in south-eastern Australia, and is one of the dominant micro-spiders in moss on Mount Donna Buang, in the Yarra Ranges of Victoria (M. Rix, pers. obs.). It can be found in sympatry with E. alpina   at several localities (e.g. at Cuckoo Falls, Tasmania).

NMV

Museum Victoria

WAM

Western Australian Museum

AMNH

American Museum of Natural History

MCZ

Museum of Comparative Zoology

QMB

Queensland Museum, Brisbane