Pachygnatha intermedia, 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 : 6-9

Pachygnatha intermedia sp. nov.

urn:lsid:zoobank.org:act: AE 150829 -001F-4063-94A1-86FDA88B309D

Figs 1 D–I, 3A–H, 5A

Diagnosis

Males are recognized by details of the palp: the cymbium is unique in having a central membranous area dividing it into a proximal and a distal part, the latter provided with a short, thin prong; the paracymbium is broad at its base with a retrolateral swelling and a triangular prolateral extension, the distal part is slender and tapered to a point; the tibia has a well developed truncate dorsal apophysis. The female is recognized by the rectangular sclerotised areas in front and behind the genital opening.

P. intermedia sp. nov. is closely related to P. okuensis Bosmans & Bosselaers, 1994 . The males share the distal paracymbial excavation, the shape of the cheliceral fang and the lozenge shaped paracymbium. Both the latter differ in details of the shape: in P. intermedia the triangular extension of the cheliceral fang is much more pronounced and the distal prong of the paracymbium is much more slender and longer; the excavation of the cymbium is subdistal whereas it is at the distal tip of P. okuensis . The female has a cheliceral spur on the promargin of the chelicerae. With P. goedeli Bosmans & Bosselaers, 1994 it shares the paracymbium with long narrow distal extension and the small cymbial distal prong but details of these sclerites are clearly different.

Etymology

The specific name intermedia refers to shape of the paracymbium which is of median size in between the very broad paracymbium of Pachygnatha ventricosa sp. nov. and the narrow one of P. bispiralis sp. nov.

Type material examined

Holotype

BURUNDI: ♂, Kibira National Park , Rwegura , Mt Musumba , 02.87149°S, 029.49641°E, site 3 , forest with Hagenia abyssinica , 10 Jul. 2008, 2444 m, pitfalls, B. Nzigidahera ( MRAC 226552 ) .

Paratypes

BURUNDI: 1 ♂, Kibira National Park , Rwegura , Mt Musumba (same locality for all paratypes), 02.86435°S, 029.49540°E, site 7 , tea plantation , 10 Dec. 2008, 2100 m, pitfalls, B. Nzigidahera ( MRAC 226772 ) ; 1 ♂, 25 Feb. 2008 ( INECN) ; 1 ♀, 25 Oct. 2008 ( INECN) ; 1 ♂, 02.86435°S, 029.49546°E, site 6 , forest with Carapa grandiflora and Polyscias fulva , 25 Feb. 2008, 2150 m ( MRAC 226558 ) ; 3 ♂♂, 25 Jul. 2008 ( MRAC 226562 ) ; 1 ♂, 10 Nov. 2008 ( INECN) ; 3 ♀♀, 02.86445°S, 029.49640°E, site 5 , forest with Carapa grandiflora and Polyscias fulva , 25 Apr. 2008, 2252 m ( MRAC 226747 ) ; 1 ♂, 25 Jul. 2008 ( MRAC 226573 ) ; 1 ♀, 10 May 2008 ( MRAC 226528 ) ; 1 ♂, 10 Jun. 2008 ( MRAC 226551 ) ; 1 ♂, 10 Jul. 2008 ( MRAC 226548 ) ; 1 ♂, 02.86455°S, 029.50427°E, site 4 , forest with Macaranga neomildbraediana and Polyscias fulva , 10 Oct. 2008, 2352 m ( MRAC 226735 ) ; 2 ♂♂, 25 Mar. 2008 ( MRAC 226554 ) ; 1 ♀, 25 May 2008 ( MRAC 226543 ) ; 2 ♀♀, 25 Sep. 2008 ( MRAC 226535 ) ; 2 ♀♀, 25 Mar. 2008 ( MRAC 226534 ) ; 2 ♂♂, 10 Jan. 2008 ( MRAC 226555 ) ; 1 ♂, 25 Aug. 2008 ( MRAC 226547 ) ; 2 ♂♂, 25 Feb. 2008 ( MRAC 226571 ) ; 1 ♀, 25 Sep. 2008 ( MRAC 226527 ) ; 1 ♂, 10 Dec. 2008 ( INECN) ; 1 ♂, 25 Apr. 2008 ( INECN) ; 2 ♂♂, 10 Aug. 2008 ( INECN) ; 1 ♂, 25 Oct. 2008 ( INECN) ; 1 ♂, 25 Jun. 2008 ( INECN) ; 3 ♀♀, 25 Jul. 2008 ( INECN) ; 1 ♀, 25 Dec. 2008 ( INECN) ; 1 ♀, 10 Sep. 2008 ( INECN) ; 2 ♀♀, 10 Apr. 2008 ( INECN) ; 3 ♂♂, 02.87149°S, 029.49641°E, site 3 , forest with Hagenia abyssinica , 25 Nov. 2008, 2444 m ( MRAC 226566 ) ; 1 ♂, 10 Jul. 2008 ( MRAC 226552 ) ; 1 ♀, 25 Dec. 2008 ( MRAC 226544 ) ; 4 ♂♂, 2 juvs, 26 Jan. 2008 ( MRAC 226549 ) ; 1 ♂, 10 Sep. 2008 ( MRAC 226569 ) ; 3 ♂♂, 25 Feb. 2008 ( MRAC 226561 ) ; 1 ♀, 10 Apr. 2008 ( MRAC 226524 ) ; 1 ♂, 25 Jun. 2008 ( MRAC 226563 ) ; 1 ♂, 10 Dec. 2008 ( MRAC 226556 ) ; 1 ♂, 10 Oct. 2008 ( INECN) ; 2 ♀♀, 10 Feb. 2008 ( INECN) ; 1 ♀, 26 Jan. 2008 ( INECN) ; 4 ♀♀, 10 Mar. 2008 ( INECN) ; 1 ♂, 10 Feb. 2008 ( INECN) ; 2 ♂♂, 02.87060°S, 029.49669°E, site 2 , forest with Hagenia abyssinica , 26 Jan. 2008, 2548 m ( MRAC 226756 ) ; 2 ♂♂, 25 Jul. 2008 ( MRAC 226553 ) ; 1 ♂, 25 Dec. 2008 ( MRAC 226568 ) ; 2 ♂♂, 1 juv., 25 Feb. 2008 ( MRAC 226572 ) ; 1 ♂, 10 Aug. 2008 ( INECN) ; 2 ♀♀, 02.87696°S, 029.49709°E, site 1 , forest mountain heather , Phillipia benguelensis , 10 Mar. 2008, 2650 m ( MRAC 226539 ) ; 1 ♂, 10 May 2008 ( MRAC 226567 ) ; 1 ♂, 10 Apr. 2008 ( MRAC 226559 ) ; 1 ♂, 10 Jun. 2008 ( MRAC 226557 ) ; 3 ♀♀, 25 Dec. 2008 ( MRAC 226540 ) ; 1 ♂, 25 Apr. 2008 ( MRAC 226548 ) ; 1 ♂, 10 Nov. 2008 ( MRAC 226560 ) ; 4 ♂♂, 25 Feb. 2008 ( MRAC 226550 ) ; 1 ♂, 25 May 2008 ( MRAC 226565 ) ; 2 ♀♀, 10 Sep. 2008 ( MRAC 226545 ) ; 4 ♂♂, 25 Dec. 2008 ( INECN) ; 2 ♂♂, 25 Mar. 2008 ( INECN) ; 2 ♂♂, 10 Mar. 2008 ( INECN) ; 1 ♂, 25 Jul. 2008 ( INECN) ; 1 ♂, 25 Sep. 2008 ( INECN) ; 2 ♀♀, 25 Mar. 2008 ( INECN) ; 3 ♀♀, 25 Feb. 2008 ( INECN) .

Description

Male

Holotype, Figs 1 D–F, 3A–D.

MEASUREMENTS. Total length 3.80, carapace 1.90 long, 1.60 wide.

CARAPACE. Brown, with prominent anterior part delimitated by dark brown lines converging in fovea in Y-shape.

EYES. AME: 0.14, ALE: 0.14, PLE: 0.12, PME: 0.22, AME-AME: 0.04, PME-PME <0.02, AME-ALE:

0.12, PME-PLE: 0.14, ALE-PLE: 0.00, MOQ: AW: 0.36, PW: 0.40, L: 0.44.

CHELICERAE. ( Fig. 3 C–D). Three promarginal teeth, four retromarginal teeth, with oval spur at tip. Cheliceral fang curved with pronounced triangular extension in the middle.

STERNUM. Brown, with a sharp sclerotised point at each end of the slightly concave anterior margin; intercoxal extensions present.

LEGS. Pale yellowish brown with some vague grey spots near femur-patella and tibia-metatarsus articulations; one dorsal distal spine on patellae; no further spines.

ABDOMEN. Dorsum pale grey with irregular, connected dark grey spots in almost three longitudinal lines, raising a pale area in anterior part; venter pale grey with silvery spots in four longitudinal lines. Spinnerets yellowish grey.

PALP. ( Fig. 3 A–B). Dorsal tibial apophysis rectangular, retrolateral tibial apophysis oval, sclerotised, with setae, ventral tibial apophysis broad, sclerotised, blade shaped. Paracymbium with lozenge-shaped base and long, slender, distal prong surpassing the tegulum. Cymbium with remarkable membranous central part, with deep subdistal excavation at the tip, delimiting a thin lateral prong with a few setae. Embolus long, broad at the base, thin in middle, slightly widened and with flat, bifid tip; conductor with large, strongly sclerotised, distal part.

LEG MEASUREMENTS

Female

Paratype, MRAC 226544, Figs 1 G–I, 3E–H. Very similar to male.

MEASUREMENTS. Total length 4.80. Carapace. 1.92 long, 1.50 wide.

EYES. AME: 0.14, ALE: 0.16, PME: 0.24, PLE: 0 14, AME-AME: 0.06, PME-PME <0.02, ALE-PLE:

0.00, AME-ALE: 0.10, PME-PLE: 0.12; MOQ: AW: 0.44, PW: 0.32, L: 0.44.

CHELICERAE. ( Fig. 3 E–F). Yellowish brown, 3 teeth on promargin and basal spur, 3 teeth on retromargin.

EXTERNAL GENITALIA. ( Figs 3 G–H, 5A). With rectangular sclerotised areas in front of and behind the genital opening.

LEG MEASUREMENTS

Other material examined

BURUNDI: 3 ♂♂, 2 ♀♀, Kibira National Park , Rwegura Forest , 02.89435°S, 029.50078°E, forest with Maracanga neomildbreadiana and Xymalos monospora , 19 Mar. 2003, 2223 m, pitfalls, B. Nzigidahera ( INECN) ; 1 ♀, same locality, 23 May 2003 ( INECN) ; 1 ♂, same locality, 27 Dec. 2003 ( INECN) ; 2 ♂♂, 5 ♀♀, same locality, 13 Sep. 2003 ( INECN) ; 1 ♂, same locality, 14 Jan. 2004 ( 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) ; 3 ♂♂, 1 ♀, 1 juv., same locality, 12 Feb. 2003 ( INECN) ; 1 ♂, 1 ♀, 1 juv., same locality, 21 Mar. 2003 ( INECN) ; 1 ♀, Kibira National Park , Bugarama Forest , 03.26537°S, 029.54921°E, forest with Symphonia globulifera and Parinari holstii , 28 Mar. 2003, 2202 m, pitfalls, B. Nzigidahera ( INECN) ; 1 ♂, same locality, 14 Oct. 2003 ( INECN) ; 1 ♂, same locality, 15 Jul. 2003 ( INECN) ; 1 ♂, 1 juv., same locality, 14 Oct. 2003 ( INECN) ; 1 ♂, same locality, 30 Jul. 2003 ( INECN) ; 3 ♂♂, 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) .

Distribution

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

Figures

Fig. 3. Pachygnatha intermedia sp. nov. A. Male palp, ventral view. B. Male palp, retrolateral view. C. Male chelicera, frontal view. D. Male chelicera, ventral view. E. Female chelicera, ventral view. F. Female chelicera, frontal view. G. Female abdomen, ventral view. H. Female external genitalia, ventral view. Scale bars: A – F, H = 0.1 mm; G = 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.