Ketambea acuta, Tanasevitch, Andrei V., 2017

Tanasevitch, Andrei V., 2017, New species and new records of linyphiid spiders from the Indo-Malayan Region (Araneae, Linyphiidae), Zootaxa 4227 (3), pp. 325-346 : 335-336

publication ID

https://doi.org/ 10.11646/zootaxa.4227.3.2

publication LSID

lsid:zoobank.org:pub:C740FE23-33BC-41D3-9684-C9D845A8EB7B

DOI

https://doi.org/10.5281/zenodo.6027829

persistent identifier

https://treatment.plazi.org/id/03FDD960-F65A-8E31-94F7-DE9CE27EFEE7

treatment provided by

Plazi

scientific name

Ketambea acuta
status

sp. nov.

Ketambea acuta View in CoL new species

Figs 30–36 View FIGURES 30 – 38 , 39–42 View FIGURES 39 – 42

Holotype male ( MHNG), THAILAND, Lamphun Province, Mae Tha Distr. , Doi Khuntan N.P., 800 m a.s.l.; 23.IX.1994 ; P. Schwendinger leg. Paratypes. 1 male, 1 female (MHNG), collected together with the holotype. 1 male ( MHNG), Lamphun Province, Mae, Tha Distr., Doi Khuntan National Park , 700 m a.s.l.; 22.XI.1994; P. Schwendinger leg . 1 male ( SMF), MYANMAR , southern Chin State, above Kampetlet, below Mountain Oasis Resort , 21°11’49.5”N 94°02’25.0”E, 1716 m a.s.l., secondary forest, by hand, at night; 15.V.2014 GoogleMaps ; P. Jäger leg. 1 female ( SMF), same locality, at night, by hand; 17.V.2014 GoogleMaps ; P. Jäger leg.

Type material examined. Male holotype of Ketambea rostrata Millidge & Russell-Smith, 1992 (MHNG), from northern Sumatra.

Etymology. The specific name is a Latin adjective that means “pointed, needle-shaped”, referring to the shape of the lower lobe of the anterior apophysis of the convector in the male palp. Diagnosis. The new species is very similar to K. rostrata Millidge & Russell-Smith, 1992 , known from northern Sumatra ( Millidge & Russell-Smith 1992), and differs by the much longer outgrowth on the proximal part of the convector, and the absence of a pointed process (AUL in Fig. 37 View FIGURES 30 – 38 ) on the upper lobe of the anterior apophysis of the convector (cp. Figs 31, 34 View FIGURES 30 – 38 , 39, 40 View FIGURES 39 – 42 and Fig. 37 View FIGURES 30 – 38 ). The female of K. acuta is distinguished by the wide (versus thin in K. rostrata ) septum which divides the epigynal aperture into two parts, as well as by the oval (versus triangular in K. rostrata ) aperture, and the absence of two pockets anteriorly, while in K. rostrata the lateral walls of the epigynum bend towards each other, converging together anteriorly and forming two small pockets.

Description. Male paratype from Doi Khuntan N.P. Rather large Linyphiinae , total length 3.05. Carapace 1.40 long, 1.05 wide, pale brown. Chelicerae 0.65. long, stridulatory furrows well-developed. Legs pale brown, ends of segments darkened. Leg I 5.90 long (1.60+1.50+0.45+1.50+0.85), IV 4.45 long (1.20+0.35+1.00+1.25+0.65). Chaetotaxy. FeI: 1-2-0-0, II-IV: 1-0-0-0; TiI: 2-1-1-0; II: 2-0-1-0, III: 2-0-0-1, IV: 2-0-0-1; MtI-II: 0-0-0-0, MtIII- IV: 1-0-0-0. TmI 0.26. Metatarsi IV without trichobothrium. Palp ( Figs 31, 34 View FIGURES 30 – 38 , 39–41 View FIGURES 39 – 42 ): Tibia very short, with a group of slightly curved spines arranged in a row. Cymbium without posterodorsal outgrowth(s). Paracymbium very small, its distal part curved, thread-like. Embolic division with a large, flat, strongly sclerotized convector, ending up with an apophysis divided into two lobes: lower lobe long, pointed, stylet-shaped; upper one flat, eggshaped. Embolus long, coiled, its radical part small, well-sclerotized. Median membrane a massive, long, flocculent tissue. Abdomen 1.70 long, 1.00 wide, dorsal pattern as in Fig. 30 View FIGURES 30 – 38 .

Female paratype from Doi Khuntan N.P. Total length 3.01. Carapace 1.20 long, 0.95 wide. Chelicerae 0.60 long. Leg I 5.43 long (1.45+0.40+1.35+1.43+0.80), IV 4.60 long (1.35+0.35+1.00+1.20+0.70). TmI 0.24. Abdomen 2.00 long, 1.30 wide, dorsal and ventral patterns as in Fig. 32 View FIGURES 30 – 38 and Fig. 33 View FIGURES 30 – 38 , respectively. Epigynum ( Figs 33, 35 View FIGURES 30 – 38 ): aperture oval, septum relatively wide, dividing aperture into two parts. Posterior median plate wide, with a small protuberance in the middle. Vulva ( Figs 36 View FIGURES 30 – 38 , 42 View FIGURES 39 – 42 ): seminal ducts very thick, each making two loops. Leg coloration and chaetotaxy as in male.

Distribution. Thailand and Myanmar .

MHNG

Museum d'Histoire Naturelle

SMF

Forschungsinstitut und Natur-Museum Senckenberg

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Linyphiidae

Genus

Ketambea

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF