Patelliella adusta 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: 78-79

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.3789488

persistent identifier

http://treatment.plazi.org/id/7E13878E-FFFB-1B35-FF32-1ECBFC2D89E4

treatment provided by

Plazi

scientific name

Patelliella adusta Rix & Harvey
status

sp. n.

Patelliella adusta Rix & Harvey   , sp. n.

urn:lsid:zoobank.org:act:1AD1C743-0B7A-4F65-9AFB-CD6A34402E82

Figs 7N View Figure 7 , 143–151, 216

Type material. Holotype male: Mount Gower summit, D Gully, Lord Howe Island, New South Wales, Australia, 850 m, moss on trees, 16.XI.1979, G. Monteith ( QMB S88030 View Materials ).  

Paratypes: Allotype female, same data as holotype ( QMB S88031 View Materials ); 2 males and 1 female, same data as holotype ( QMB S88032 View Materials SEM♁ ♀); 2 females, east end of Mount Gower summit, leaf litter ex Dawsonia   , moss off log, 31°35'07"S, 159°04'43"E, 15.V.2001, I. Hutton ( AMS KS79112) GoogleMaps   .

Other material examined. AUSTRALIA: New South Wales: Lord Howe Island: Mount Gower: far eastern edge of Little Pocket , leaf litter, 31°35'23"S, 159°04'11"E, 23.V.2002, I. Hutton, 1♀ ( AMS KS88975) GoogleMaps   ; midway down ridge N. of igloo, moss, 31°35'05"S, 159°04'35"E, 20.XI.2001, I. Hutton, 1♀ ( AMS KS85197) GoogleMaps   ; ridge, leaf litter ex moss, 31°35'18"S, 159°04'20"E, 20.XI.2001, I. Hutton, P. Flemons, C. Reid, 1♀ ( AMS KS85198) GoogleMaps   ; Station 45, north-eastern area of summit, in lichen on tree trunks, 31°35'12"S, 159°04'42"E, 15.II.1971, M. Gray, 1♁ ( AMS KS86058) GoogleMaps   ; summit, litter, 31°35'23"S, 159°04'19"E, 1.II.1979, T. Kingston, B. Miller, 2♀ ( AMS KS88977) GoogleMaps   ; top of gully N. of igloo, leaf litter ex moss, 31°35'07"S, 159°04'36"E, 20.XI.2001, I. Hutton, P. Flemons, C. Reid, 1♁ ( AMS KS79111) GoogleMaps   ; top of large ridge, 31°35'16"S, 159°04'24"E, 20.XI.2001, I. Hutton, P. Flemons, C. Reid, 1♁, 1♀ ( AMS KS79113) GoogleMaps   . Mount Lidgbird: 31°33'S, 159°05'E, 1978, T. Kingston, 1♁ ( AMS KS88976) GoogleMaps   .

Etymology. The specific epithet is derived from the Latin ‘adustus’, meaning ‘tanned’ or ‘brown’ ( Brown 1956), and refers to the brown body colouration of this species.

Diagnosis. As for the tribe Patelliellini   (see above).

Description. Holotype male: Total length 1.18. Carapace 0.57 long, 0.50 wide. Abdomen 0.78 long, 0.65 wide. Leg I femur 0.47. Cephalothorax, abdominal sclerites brown; legs tan-yellow; abdomen dark-olive. Carapace significantly raised anteriorly, not fused to sternum except around petiole; dorsal surface of pars cephalica slightly convex in lateral view; clypeus bulging anteriorly. 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 each with bulging anterior projection; promargin with one peg tooth. Legs relatively short (leg I femur-carapace ratio 0.82); macrosetae absent. Abdomen oval, covered with hair-like setae; dorsal scute large, covering most of dorsal surface of abdomen; lateral sclerotic strips absent. Pedipalp as for the Tribe Patelliellini   (see above).

Allotype female: Total length 1.23. Carapace 0.57 long, 0.45 wide. Abdomen 0.88 long, 0.67 wide. Leg I femur 0.43. Cephalothorax, abdominal sclerites brown; legs tan-yellow; abdomen olive. Carapace raised anteriorly, not fused to sternum except around petiole; dorsal surface of pars cephalica slightly convex in lateral view; clypeus bulging anteriorly. 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 0.75); macrosetae absent. Abdomen oval, covered with hair-like setae, each seta projecting from small sclerotic spot; dorsal scute and lateral sclerotic strips absent. Pedipalp entire, five-segmented. Epigyne as for the Tribe Patelliellini   (see above).

Distribution. Known only from southern Lord Howe Island in the western Pacific Ocean, 780 km north-east of Sydney (Fig. 216).

Remarks. Patelliella adusta   has been collected only from the wet, montane cloud forest that occurs on the 27 hectare summit of Mount Gower, Lord Howe Island ( Figs 220 View Figure 220 B–E), with a single additional specimen collected from nearby Mount Lidgbird (Figs 216, 220). The species is remarkable among Micropholcommatinae   in having no known close relatives, and as such its presence on Lord Howe Island is puzzling, given the recent Australasian affinities of most of the fauna and flora of the island ( Hutton 1998; Savolainen et al. 2006; Austin and Jennings 2009). Unlike the sympatric micropholcommatid species Taphiassa magna   and Rayforstia lordhowensis   , P. adusta   has never been collected in the lowland forests on the northern half of the island, and the main population is restricted to the small, 850 m high plateau-like summit of Mount Gower (Figs 216, 220). Clearly, given its unique phylogenetic position and extremely limited distribution, this enigmatic species is of the highest conservation significance.

Subfamily Taphiassinae Rix & Harvey   , subfam. n. urn:lsid:zoobank.org:act:69327955-5C5C-49FA-BA8E-71151812EABB

QMB

Queensland Museum, Brisbane