Pachygnatha bispiralis, Nzigidahera, Benoît & Jocqué, Rudy, 2014

Nzigidahera, Benoît & Jocqué, Rudy, 2014, On the genus Pachygnatha (Araneae, Tetragnathidae) in the Albertine Rift of Burundi, with the description of three new species, European Journal of Taxonomy 93, pp. 1-16 : 2-5

Pachygnatha bispiralis sp. nov.

urn:lsid:zoobank.org:act:E6CDD3F2-0E67-4520-A794-E5D48E37EFC8

Figs 1A–C , 2 A–D

Diagnosis

Males are easily recognized by several unique features: the peculiar cymbium which is strongly narrowed at the mid-point, the very long conductor protruding beyond the cymbium, the tibia with a large ventrolateral apophysis and the very large, claw shaped, distal spur on the chelicerae.

Etymology

The specific name bispiralis refers to the broad embolus with longitudinal groove giving the impression of a sclerite with two spirals.

Type material examined

Holotype

BURUNDI: ♂, Kibira National Park , Rwegura , Mt Musumba , 02.87696°S, 029.49709°E, site 1 , mountain heather with Philippia benguelensis , 10 Mar. 2008, 2650 m, pitfalls, B. Nzigidahera ( MRAC 226712 ) .

Paratypes

BURUNDI: 2 ♂♂, Kibira National Park , Rwegura , Mt Musumba , 02.86435°S, 029.49540°E, site 7 , tea plantation , 10 Sep. 2008, 2100 m, pitfalls, B. Nzigidahera ( INECN) ; 1 ♂, same locality, 02.86435°S, 029.49546°E, site 6 , forest with Carapa grandiflora and Polyscias fulva , 25 Mar. 2008, 2150 m ( MRAC 226711 ) ; 1 ♂, 1 juv., same locality, 10 Mar. 2008 ( MRAC 226730 ) ; 1 ♂, same locality, 02.86445°S, 029.49640°E, site 5 , forest with Carapa grandiflora and Polyscias fulva , 25 Jul. 2008, 2252 m ( MRAC 226722 ) ; 1 ♂, same locality, 10 Apr. 2008 ( MRAC 226724 ) ; 1 ♂, same locality, 25 Feb. 2008 ( MRAC 226731 ) ; 2 ♂♂, same locality, 10 Dec. 2008 ( MRAC 226732 ) ; 1 ♂, same locality, 25 Dec. 2008 ( MRAC 226725 ) ; 1 ♂, same locality, 15 Mar. 2008 ( MRAC 226719 ) ; 3 ♂♂, same locality, 26 Jan. 2008 ( MRAC 226721 ) ; 1 ♂, same locality, 02.87149°S, 029.49641°E, site 3 , forest with Hagenia abyssinica , 25 Apr. 2008, 2444 m ( MRAC 226727 ) ; 1 ♂, same locality, 26 Jan. 2008 ( MRAC 226715 ) ; 1 ♂, same locality, 10 Mar. 2008 ( MRAC 226716 ) ; 1 ♂, same locality, 25 Nov. 2008 ( MRAC 226723 ) ; 3 ♂♂, same locality, 25 Feb. 2008 ( MRAC 226720 ) ; 1 ♂, same locality, 10 Nov. 2008 ( INECN) ; 1 ♂, same locality, 02.87060°S, 029.49669°E, site 2 , forest with Hagenia abyssinica , 25 Apr. 2008, 2548 m ( INECN) ; 1 ♂, same locality, 02.87696°S, 029.49709°E, site 1 , forest mountain heather , Phillipia benguelensis , 25 Dec. 2008, 2650 m ( MRAC 226717 ) ; 2 ♂♂, same locality, 10 Nov. 2008 ( MRAC 226729 ) ; 1 ♂, same locality, 25 Oct. 2008 ( MRAC 226726 ) ; 1 ♂, same locality, 25 Mar. 2008 ( MRAC 226564 ) ; 1 ♂, same locality, 25 Jun. 2008 ( INECN) ; 1 ♂, same locality, 10 Sep. 2008 ( INECN) ; 1 ♂, same locality, 25 Feb. 2008 ( INECN) ; 1 ♂, same locality, 0289891°S, 02950405°E, site 1 , tea plantation , 15 May 2005, 1970 m ( INECN) ; 1 ♂, Kibira National Park , Rusarenda Forest , 03.14228°S, 029.56235°E, forest with Neoboutonia macrocalyx and Myrianthus holstii , 12 Feb. 2003, 2237 m, pitfalls, B. Nzigidahera ( INECN) ; 1 ♂, Kigwena Nature Reserve , Kigwena Forest , 02.89891°S, 029.50405°E, forest with Newtonia buchananii and Albizia zygia , 5 Jan. 2004, 793 m, pitfalls, B. Nzigidahera ( INECN) .

Description

Male

Holotype, Figs 1A–C , 2 A–D.

MEASUREMENTS. Total length 2.70, carapace 1.20 long, 1.08 wide.

CARAPACE. Pale brown, with two lateral dark brown bands; prominent in anterior part.

EYES. AME: 0.12, ALE: 0.12, PLE: 0.12, PME: 0.20, AME-AME: 0.02, PME-PME: 0.02, AME-ALE:

0.04, PME-PLE: 0.06, ALE-PLE: 0.00, MOQ: AW: 0.26, PW: 0.32, L: 0.32.

CHELICERAE. ( Fig. 2 C–D). Four promarginal teeth, four retromarginal teeth, large claw shaped prolateral spur with broad base and sharp, curved tip.

STERNUM. Brownish grey with some setae, distal margin concave; intercoxal sclerites present.

LEGS. Yellowish brown; one distal dorsal spine on patellae; no further spines.

ABDOMEN. Yellowish grey with irregular, connected dark grey spots in almost three longitudinal lines, mixed with silvery spots. Spinnerets pale yellow.

PALP. ( Fig. 2 A–B). Sclerotised tibial apophysis very broad, large blade-shape retrolaterally high, ventrally short. Paracymbium long, straight with some long hairs at the sharp, slightly curved tip. Cymbium very broad at base, thin in middle and wider towards tip. Embolus long, running along tegulum and beyond to tip of cymbium, supported by conductor.

LEG MEASUREMENTS

Female

Unknown.

Distribution

Known from Kibira National Park and Kigwena Nature Reserve in Burundi.

Figures

Fig. 2. Pachygnatha bispiralis sp. nov. A. Male left palp, dorsal view. B. Male palp, retrolateral view. C. Male right chelicera, frontal view. D. Male right chelicera, ventral view. Scale bars = 0.1 mm.

Fig. 1. A – C. Pachygnatha bispiralis sp. nov. A. Male habitus, dorsal view. B. Male habitus, ventral view. C. Male habitus, lateral view. D – I. Pachygnatha intermedia sp. nov. D. Male habitus, dorsal view. E. Male habitus, ventral view. F. Male habitus, lateral view. G. Female habitus, dorsal view. H. Female habitus, ventral view. I. Female habitus, lateral view. J – O. Pachygnatha ventricosa sp. nov. J. Male habitus, dorsal view. K. Male habitus, ventral view. L. Male habitus, lateral view. M. Female habitus, dorsal view. N. Female habitus, ventral view. O. Female habitus, lateral view. Scale bars = 2 mm.