Perania siamensis Schwendinger, 1994

Schwendinger, Peter J., 2013, A taxonomic revision of the spider genus Perania Thorell, 1890 (Araneae: Tetrablemmidae: Pacullinae) with the descriptions of eight new species, Revue suisse de Zoologie 120 (4), pp. 585-663 : 597-599

Perania siamensis Schwendinger, 1994 Fig. 2E-G

Perania siamensis Schwendinger, 1994: 452-456 , figs 15-25 (description of male and female). – Platnick, 2013 (listing).

HOLOTYPE: MHNG; Ƌ; Thailand, Ranong Province, about 4 km east of Ranong city, on road to Had Sompaen (9°57’47”N, 98°40’41”E), 50 m; 18.IX.1992; leg. P. J. Schwendinger. PARATYPES: MHNG; 1 Ƌ, 3 ♀; same data as for holotype .

OTHER MATERIAL EXAMINED ( INCLUDING NEW MATERIAL): MHNG; 1 Ƌ, 3 ♀; Thailand, Prachuab Khiri Khan Province, Thab Sakae District, Huay Yang National Park (11°37’45”N, 99°34’41”E), 700 m; 29.XI.1991 . – MHNG; 3 ♀; Thailand, Ranong Province, Kapoe District, Khlong Nakha Wildlife Sanctuary (9°27’26”N, 98°30’43”E), 30 m; 29.I.1991 . – MHNG; 1 Ƌ, 6 ♀; Thailand, Krabi Province, Khao Phanom District, Khao Phanom Bencha National Park, above Huay To Waterfall (8°14’19”N, 98°55’11”E), 220-260 m; 22.IX.1992, 22.VII.2005 . – MHNG; 3 Ƌ, 1 ♀; Thailand, Krabi Province, Ao Luk District, Thanboke Khoranee National Park, near Sra Boke Khoranee (8°23’12”N, 98°44’16”E), 50 m; 18./ 19.IX.2006 . – MHNG; 1 ♀; Thailand, Phang Nga Province & District, forest above Chao Ngu Cave (8°26’55”N, 98°32’52”E), 250 m, 14.VII.2011. All leg. P. J. Schwendinger.

DIAGNOSIS: See Schwendinger (1994: 452).

NEW CHARACTERS: Metatarsi I and II in males and females without modified ventral setae (as present in P. robusta ). Anterior pair of ventrolateral plates in males mostly free, only their posterior tips fused with pulmonary plate. Postgenital plate in males not (linked by a pigmented but not sclerotised suture) or only partially fused (suture sclerotised in some portions) with posterior margin of pulmonary plate. Preanal plate of females always distinct but very short, anterior opisthosomal plate completely fragmented. Apex of embolus very deep and fan-shaped, without separation into subterminal lamella and embolic part (Fig. 2F). Vulva with both spermathecae strongly bulged, medially close to each other, separated by a deep and narrow gap; anterolateral sides of spermathecae convex, porepatches large (Fig. 2G); posterior portion of spermathecae completely unpigmented. Ventral wall of genital atrium largely unpigmented expect for a narrow triangular, strongly pigmented zone along each lateral margin.

REMARKS: Sra Boke Khoranee and Chao Nu Cave are new localities which lie within the previously known range of this species. At these two sites spiders were collected from webs running into cracks and holes in limestone cliffs and limestone outcrops. The new specimens from Khao Phanom Bencha were found on earthbanks in a semi-evergreen rainforest. The new females are all relatively large, in the size range of the females from Huay Yang and Khao Phanom Bencha mentioned in Schwendinger (1994: 445).

DISTRIBUTION: Southern Thailand, from Prachuab Khiri Khan Province to

Krabi Province (Fig. 1, localities 4-8).

THE PERANIA NASUTA SPECIES GROUP

DIAGNOSIS: Spermathecae and ventral wall of genital atrium entirely and uniformly pigmented; porepatches on spermathecae indistinctly outlined, only little extending onto dorsal side of vulva; areas with porepatches bulged or forming more or less distinct trenches. Females of some species with clypeal hump and with conical setal bases ventrally on tibia I and metatarsus I. Males (unknown for P. birmanica ) with long clypeal process with widened, flattened and truncate apex; no distolateral cheliceral boss; anterior pair of ventrolateral plates in males completely or largely free; bulbus of male palpal organ mostly globular (except for P. egregia sp. n.), apex of embolus divided into 2-4 tips; subterminal lamella always present and pronounced, lobate or bifid, smaller or larger than embolic part. Femora of legs and palps in males granular (with slightly elevated setal bases).

SPECIES INCLUDED: Perania birmanica , P. egregia sp. n., P. ferox sp. n.,

P. nasicornis , P. nasuta , P. quadrifurcata sp. n.

DISTRIBUTION: Eastern Myanmar, western, northern and northeastern Thailand

(Fig. 1, localities 9-19).