Holmelgonia bosnasutus, Benoît Nzigidahera & Rudy Jocqué, 2014

Benoît Nzigidahera & Rudy Jocqué, 2014, On the Afrotropical genus Holmelgonia (Araneae, Linyphiidae), with the description of three new species from the Albertine Rift, European Journal of Taxonomy 77, pp. 1-18 : 11-14

Holmelgonia bosnasutus sp. nov.

urn:lsid:zoobank.org:act:098B9E4B-00C0-437E-A36E-EEE46A2D9826

Figs 6, 9 , 17-22 , 30-34 , 40

Diagnosis

The male is characterized by the sharply pointed dorsal tibial apophysis with undulated margin, each undulation provided with a hair, combined with the broad prolateral apophysis, the broad proximal arm and smoothly rounded tip of the distal arm of the paracymbium. Females are recognized by the shape of the epigyne, provided with two holes clearly visible and opening in the posterior margin.

Etymology

The specific name ‘ bosnasutus’ refers to the shape of the epigyne which is reminscent of a cow’s nose.

Material examined

Holotype

BURUNDI: ♂, Parc National de la Kibira , Mt. Musumba , Rwegura , 2°52’ S, 29°30’ E, 28 Dec. 2004, site 2 , forest with Hagenia abyssinica , B. Nzigidahera coll. ( MRAC 227508 ) .

Paratypes

BURUNDI: All from Parc National de la Kibira , forêt de Rwegura , pitfalls, B. Nzigidahera coll . ‒ 2.89565° S, 29.50345° E, site 2 , forest with Polyscias fulva and Macaranga neomildbraediana , 2120 m: 1 ♂, 29 Jun. 2005 ( INECN) ; 1 ♂, 28 Dec. 2004 ( MRAC 227567 ) . ‒ 2.88562°S, 29.50221°E, site 3 , forest with Polyscias fulva and Hagenia abyssinica , 2160 m: 1 ♀, 27 May 2005 ( MRAC 227507 ) ; 1 ♂, 15 Mar. 2005 ( INECN) . ‒ 2.89435° S, 29.50078°E, site 4 , 2400 m: 2 ♂♂, 28 Feb. 2005 ( INECN) ; 1 ♂, 28 Dec. 2004 ( INECN) .

Other material

BURUNDI: Parc National de la Kibira , Rwegura , Mt Musumba , B. Nzigidahera coll., 2.86435°S, 29.49540°E, site 7 , tea plantation , 2100 m: 1 ♂, 25 Aug. 2008 ( MRAC 227146 ) ; 1 ♂, 10 Jul. 2008 ( MRAC 227144 ) ; 2 ♂♂, 1J, 10 Oct. 2008 ( MRAC 227145 ) ; 1 ♂, 10 Nov. 2008 ( INECN) ; 1 ♂, 25 Mar. 2008 ( INECN) . ‒ 2.86435°S, 29.49546E, site 6, forest with Carapa grandiflora and Polyscias fulva , 2150 m: 1 ♂, 10 Sep. 2008 ( INECN) . ‒ 2.86455°S, 29.50427°E, site 4 , forest with Macaranga neomildbraediana and Polyscias fulva , 2352 m: 1 ♀, 10 Jul. 2008 ( MRAC 227137 ) ; 1 ♂, 25 May 2008 ( MRAC 227194 ) ; 2♂♂, 25 Dec. 2008 ( INECN) ; 1 ♂, 25 Jan. 2008 ( INECN) . ‒ 2.87060° S, 29.49669° E, site 2 , forest with Hagenia abyssinica , 2548 m: 1 ♂, 10 Jul. 2008 ( MRAC 227195 ) ; 1 ♂, 25 Apr. 2008 ( MRAC 227196 ) ; 1 ♂, 25 Jul. 2008 ( INECN) ; 1 ♂, 10 Sep. 2008 ( INECN) . ‒ 2.87696°S, 29.49709°E, site 1 , Philippia benguelensis, 2650 m: 1 ♂, 25 Nov. 2008 ( INECN) .

Description

Male (holotype, Figs 6, 9 , 17-19 , 30-33 )

MEASUREMENTS. Total length 2.00, carapace 0.88 long, 0.70 wide.

CEPHALOTHORAX. Carapace greyish brown with black striae radiating from fovea; with pale area behind posterior eyes, followed by rectangular spot from which two striae run towards the PLE. Chelicerae coloured as carapace, retromargin with 5 teeth; promargin with 5 small teeth. Clypeus 2.80 times ALE. Sternum 0.54 long, 0.44 wide, dark greyish brown, shield-shaped.

EYES. Ocular area black. Anterior eye row straight, posterior eye row strongly procurved. AME 0.03, ALE 0.08, PME 0.08, PLE 0.08.

LEGS. Yellow to greyish yellow; femora without dorsal spines, but with ventral spines in two rows. Metatarsi with dorsal spines.

LEG MEASUREMENTS

LEG CHAETOTAXY

ABDOMEN. Oval, dark greyish brown, with nine thin, pale transverse lines. Venter dark brown. Spinnerets pale greyish, short, conical.

PALP ( Figs 6, 9 , 30-33 ). Retrolateral tibial apophysis with sharp tip and undulated lateral margins, each undulation provided with a hair; laterally with short, broad prolateral apophysis with blunt tip. Paracymbium with broad proximal arm and distal arm with smoothly rounded tip. Proximal part of tegulum with ventrolateral, oblique grooves. Embolic division with short curved embolus, long sharp ventral appendage, sinuous, frontal appendage with sharp tip and long, broad, rounded dorsal appendage.

Female (paratype, MRAC 227507, Figs 20-22 , 34 , 40 )

Very similar to male.

MEASUREMENTS. Total length 2.13. Carapace 0.90 long, 0.72 wide.

CEPHALOTHORAX. Clypeus 3.0 times ALE. Sternum 0.49 long, 0.49 wide.

EYES. As in male: AME 0.03, ALE 0.08, PME 0.08, PLE 0.08.

LEGS. TM: I: 0.41, II: 0.40, III: 0.50.

LEG MEASUREMENTS

EPIGYNE ( Figs 34 , 40 ). With two holes at posterior margin, resembling the shape of a cow’s nose. Copulatory ducts short, curved, originating from triangular atrium near posterior margin; entering spermathecae near lateral margin, spermathecae oval, longest axis longitudinal.

Distribution

Known only from the type locality, Mt Musumba in Kibira National Park ( Fig. 1 ).

Figures

Fig. 1. Presently known distribution of Holmelgonia Jocqué & Scharff, 2007. Large arrow indicates Kibira National Park, type locality of the species described in this paper.

Figs 4 - 10. SEM micrographs. — 4 - 5, 8. Holmelgonia afromontana sp. nov. (♂, MRAC 227153). 4. Palp, retrolateral view. 5. As previous, ventral view. 8. Embolic division, frontal view. — 6, 9. Holmelgonia bosnasutus sp. nov. (♂, MRAC 227145). 6. Palp, retrolateral view. 9. Embolic division, ventral view. — 7, 10. Holmelgonia disconveniens sp. nov. (♂, MRAC 241448). 7. Palp, retrolateral view. 10. Embolic division, frontal view. Scale bars 4 - 7 = 100 μm; 9 - 10 = 50 μm; 8 = 20 μm. E: embolus.

Figs 11 - 25. — 11 - 16. Holmelgonia afromontana sp. nov. (♂ holotype, ♀ paratype 227154). 11. Habitus, ♂, dorsal view. 1 2. Habitus, ♂, ventral view. 13. Habitus, ♂, lateral view. 14. Habitus, ♀, dorsal view. 15. Habitus, ♀, ventral view. 16. Habitus, ♀, lateral view. — 17 - 22. Holmelgonia bosnasutus sp. nov. (♂ holotype, female paratype 227507). 17. Habitus, ♂, dorsal view. 18. Habitus, ♂, ventral view. 19. Habitus, ♂, lateral view. 20. Habitus, ♀, dorsal view. 21. Habitus, ♀, ventral view. 22. Habitus, ♀, lateral view. — 23 - 25. Holmelgonia disconveniens sp. nov. (♂ holotype). 23. Habitus, dorsal view. 24. Habitus, ventral view. 25. Habitus, lateral view. Scale bars = 0.5 mm.

Figs 30 - 34. Holmelgonia bosnasutus sp. nov. (♂ holotype, ♀ paratype 227507). 30. Palp, ♂, retrolateral view. 31. Palpal tibia, ♂, dorsal view. 32. Palpal tibia, ♂, prolateral view. 33. Embolic division of ♂ palp, ventrolateral view. 34. Epigyne, ventral view. Scale bars = 0.1 mm.

Figs 39 - 40. — 39. Holmelgonia afromontana sp. nov. (♀, 227154). Epigyne, cleared, dorsal view. — 40. Holmelgonia bosnasutus sp. nov. (♀, 227507). Epigyne, cleared, dorsal view. Scale bars = 0.1 mm.