Javanyphia, Tanasevitch, 2020

Tanasevitch, Andrei V., 2020, On linyphiid spiders from Java, Indonesia, with the description of three new genera and four new species (Araneae: Linyphiidae), Revue suisse de Zoologie 127 (1), pp. 63-74 : 68

Javanyphia gen. nov.

Type species: Javanyphia gede sp. nov.

Diagnosis: The genus contains large-sized, linyphiine-like erigonines, with a total length of 2.3-2.4, which are characterized by the following combination of somatic and genitalic characters:

1) Carapace unmodified, eyes normal in size, cephalic pits (= sulci) absent ( Figs 7-9 ).

2) Abdomen with a dorsal pattern ( Figs 7-8 ).

3) Chaetotaxy formula 2.2.1.1; each metatarsus with a trichobothrium; TmI 0.78-0.82.

4) Palpal tibia modified, with a distal claw-shaped apophysis ( Figs 21, 23 ).

5) Paracymbium relatively small.

6) Tegulum with a protegulum ( Fig. 21 )

7) Median membrane reduced.

8) Distal suprategular apophysis moderately developed ( Fig. 25 ).

9) Embolus relatively short, slightly curved; radix wide, flat; convector absent ( Figs 22, 25 ).

Etymology: The generic name is a combination of two words: “ Java ”, the “terra typica”, and a part of the genus name Linyphia . The gender is feminine.

Species included: Only the type species, Javanyphia gede sp. nov.

Taxonomic remarks: There are many large-sized, robust erigonines in an informal group which show the leg chaetotaxy formula 2.2.1.1 coupled with the presence of a trichobothrium on MtIV, e.g. Gnathonarium Karsch, 1881 , Gongylidium Menge, 1868 , Ummeliata Strand, 1942 , etc. In its habitus the new genus resembles these genera, and especially Tmeticus Menge, 1868 , but it has a different palp structure. The palp conformation of Javanyphia gen. nov. is characterized by a simple structure of the distal suprategular apophysis and of the embolic division, and their shapes resemble those of the Palaearctic-West Nearctic Leptorhoptrum robustum ( Westring, 1851) , which has the chaetotaxy formula 2.2.2.2. This similarity seems to be only a superficial resemblance, and finding a female will allow us to correctly determine the placement of the genus in the subfamily Erigoninae .

Distribution: Known only from the type locality on Java, Indonesia.

Figures

Figs 1-9. Photographs of males: the holotype of Javagone maribaya sp. nov. (1-4), the paratype of Javanaria gracilipes sp. nov. (5-6) and the holotype (7) and both paratypes (8-9) of Javanyphia gede sp. nov. (1, 5, 8-9) Habitus, dorsal view. (2, 6-7) Prosoma, lateral view. (3) Prosoma, frontal view. (4). Prosoma, dorsal view.

Figs 21-25. Details of male palp structure of Javanyphia gede sp. nov., paratype. (21-22) Right palp, retrolateral and prolateral views, respectively. (23) Palpal tibia, dorsal view.(24) Paracymbium, lateral view. (25) Distal suprategular apophysis and embolic division, ventro-lateral view.