Racata laxa, Tanasevitch, 2019

Tanasevitch, Andrei V., 2019, On the spider genus Racata Millidge, 1995, with the description of three new species (Araneae, Linyphiidae), Revue suisse de Zoologie 126 (1), pp. 53-59: 58-59

publication ID

http://doi.org/ 10.5281/zenodo.2619518

DOI

http://doi.org/10.5281/zenodo.3706019

persistent identifier

http://treatment.plazi.org/id/0C41EA60-5168-8359-FC40-36713786F851

treatment provided by

Carolina

scientific name

Racata laxa
status

sp. nov.

Racata laxa   sp. nov.

Figs 9-13 View Figs 1-13 , 26 View Figs 23-26

Holotype: Female [Sum-06/05]; INDONESIA, Sumatra, West Sumatra Province, Batang Palupuh Rafflesia Sanctuary , 12 km N of Bukittinggi, 0°14’32”S, 100°21’10”E, 900-1100 m a.s.l., primary forest; 2.-3. VI.2006; leg. P. Schwendinger. GoogleMaps  

Paratypes: 5 females [Sum-06/01]; collected together with the holotype   . – 3 females; West Sumatra Province, old secondary forest above Taman Hutan Raya Bung Hatta, near road from Padang to Lubuksulasih , 0°56’45”S, 100°32’37”E, 1100 m a.s.l.; 29.-30. V.2006; leg. P. Schwendinger. – GoogleMaps   1 female [Sum-06/03]; Anai Valley , 6 km S of Padangpanjang , 0°28’38”S, 100°21’14”E, primary forest, 500 m a.s.l.; 1. VI.2006; leg. P. Schwendinger. GoogleMaps   5 females [Sum-06/20]; disturbed primary forest near road from Lubuksikaping to Bonjol , ca 10 km S of Lubuksikaping , 0°03’16”N, 100°12’33”E, 500 m a.s.l.; 12. VI.2006; leg. P. Schwendinger. GoogleMaps   1 female; Mt Singalang (= Mt Singgalang), Anai Valley , 400 -520 m a.s.l., secondary forest, leaf litter; 9.-24. VI.1994; leg. S. Djojosudharmo.   2 females [Sum-06/22]; North Sumatra Province, Sipirok, Dolok Sipirok NP, near hot springs, about 30 km N of Padangsidempuan , 1°33’55”N, 99°17’03”E, disturbed hill forest, 1000 m a.s.l.; 16. VI.2006; leg. P. Schwendinger. GoogleMaps   1 female [AS-TH06/4]; THAILAND, Trat Province, Ko Chang, northern side, forest 3 km E of White Sand Beach , 50 -200 m a.s.l., 12.02527°N, 102.308333°E; 7.XI.2006; leg. A. Schulz. GoogleMaps  

Etymology: The specific name is a Latin adjective, meaning “wide, spacious”, referring the large epigynal cavity.

Diagnosis: The female of the new species is characterised by the specific shape of its large epigyne, namely, by the two loops of the copulatory ducts, which are visible through the translucent bottom the epigynal cavity.

Description: Female paratype from Anai Valley. Total length 1.58. Carapace 0.63 long, 0.55 wide, pale yellow, with indistinct radial stripes and narrow grey margin. Chelicerae 0.25 long. Legs pale yellow, almost white. Leg I 2.74 long (0.75+0.18+0.73+0.65+0.43), IV 2.51 long (0.73+0.15+0.65+0.58+0.0). TmI 0.28. Chaetotaxy: TiI: 2-1-1-0; II: 2-0-1-0, III-IV: 2-0-0-0; MtI-IV without spines. TmI 0.36. Length of spines 1.5-2 diameters of corresponding leg segment. Metatarsi IV without trichobothrium. Abdomen 0.95 long, 0.70 wide, pale grey, almost white. Epigyne ( Figs 9-13 View Figs 1-13 , 26 View Figs 23-26 ) with a large cavity surrounded by a sclerotized swelling; a pair of loops of the copulatory ducts, which are visible through the translucent cavity bottom.

Variability: The shape of the epigyne is slightly variable, see Figs 10-13 View Figs 1-13 .

Taxonomic remarks: The species is only known by females but can be easily recognized by its very large epigynal cavity surrounded by a sclerotized swelling, and by a pair of loops of the copulatory ducts that can bee seen through the translucent cavity bottom.

Distribution: Known from several localities on Sumatra, Indonesia and from a locality on an island off the coast of eastern Thailand.

V

Royal British Columbia Museum - Herbarium

VI

Mykotektet, National Veterinary Institute

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Linyphiidae

Genus

Racata