Holmelgonia disconveniens, 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 : 14-16

Holmelgonia disconveniens sp. nov.

urn:lsid:zoobank.org:act:2787FB55-2335-4C64-BFB8-ABC0825A7F56

Figs 2-3 , 7, 10 , 23-25 , 35-38

Diagnosis

The male is characterized by the triangular dorsal tibial apophysis, with a tooth at the tip and sinuous prolateral margin, by the fairly large, sharp, sclerotized prolateral apophysis, and by the paracymbium without hairs, its distal arm with a well delimited knob.

Etymology

The specific name ‘ disconveniens’ refers to the contrasting tinge of dark body and pale legs.

Material examined

Holotype

BURUNDI: ♂, Parc National de la Kibira , Rwegura , Mt Musumba , 2.86435° S, 29.49540° E, site 1 , tea plantation , 10 Sep. 2008, 2100 m, pitfalls, B. Nzigidahera coll. ( MRAC 229928 ) .

Paratypes

BURUNDI: 1 ♂, 10 Sep. 2008, same data as for holotype ( MRAC 229929 ) . ‒ 2.86435° S, 29.49546° E, site 6 , forest with Carapa grandiflora and Polyscias fulva , 2150 m: 1 ♂, 10 Aug. 2008 ( MRAC 229741 ) ; 1 ♂, 10 Sep. 2008 ( MRAC 229740 ) . ‒ 2.86435°S, 29.49540°E, site 7 , tea plantation , 2100 m, site 7 : 1 ♂, 10 Sep. 2008 ( MRAC 241448 ) ; 1 ♂, 10 Sep. 2008 ( MRAC 241449 ) . ‒ 2.86455° S, 29.50427° E, site 4 , forest with Macaranga neomildbraediana and Polyscias fulva , 2352 m: 2 ♂♂, 25 Nov. 2008 ( INECN) ; 1 ♂, 10 Jan. 2009 ( INECN) ; 4 ♂♂, 25 Aug. 2008 ( MRAC 227149 ) ; 1 ♂, 25 Jun. 2008 ( MRAC 227150 ) .

Description

Male (holotype, Figs 7, 10 , 23-25 , 35-38 )

MEASUREMENTS. Total length 1.8, carapace 0.80 long 0.70 wide.

CEPHALOTHORAX. Carapace dark brown, with faint dark striae radiating from fovea; striae larger towards the margin; a faint pale semicircular area behind eyes formed by two brown bands originating behind PLE, connected in front of fovea. Chelicerae yellowish brown. Retromargin with 4 teeth; promargin with 5 small teeth. Clypeus grey, 2.33 times ALE. Sternum 0.56 long, 0.50 wide, dark brown, shieldshaped.

EYES. Ocular area black. Anterior eye row recurved, posterior eye row strongly procurved; AME 0.05, ALE 0.08, PME 0.07, PLE 0.07.

LEGS. Pale yellow, tarsi and metatarsi pale grey, femora without dorsal spines, with ventral spines in two rows. Metatarsi without dorsal spines.

LEG MEASUREMENTS

LEG CHAETOTAXY

ABDOMEN. Oval, greyish black, with faint central dark brown band and small pale points, with six transverse pale chevrons in posterior half. Spinnerets yellowish grey, conical.

PALP ( Figs 7, 10 , 35-38 ). Dorsal tibial apophysis triangular, with two teeth near tip; retrolateral tibial apophysis almost as long as dorsal one, ending in sharp, slightly curved tip. Paracymbium with proximal arm without hairs; distal arm ending in well delimited, rounded knob. Subtegulum with transverse ventral grooves. Embolic division with short, curved embolus, posterior appendage very short and smoothly rounded; dorsal appendage triangular; frontal appendage short, club-shaped, with frontal margin with many small teeth.

Female

Unknown.

Distribution

Known only from the type locality ( 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 2 - 3. Holmelgonia disconveniens sp. nov. (♂, MRAC 227149). 2. SEM micrographs of chelicerae, lateral view, showing absence of stridulating ridges. 3. Detail of previous. Scale bars = 100 μm.

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 35 - 38. Holmelgonia disconveniens sp. nov. (♂ holotype). 35. Palp, retrolateral view. 36. Palpal tibia, dorsal view. 37. Palpal tibia, dorsolateral view. 38. Embolic division of palp, ventrolateral view. Scale bars = 0.1 mm.