Panjange malagos Huber

Huber, Bernhard A. & Nuñeza, Olga M., 2015, Evolution of genital asymmetry, exaggerated eye stalks, and extreme palpal elongation in Panjange spiders (Araneae: Pholcidae), European Journal of Taxonomy 169, pp. 1-46 : 11-14

Panjange malagos Huber sp. nov.

urn:lsid:zoobank.org:act:00D7154A-7034-4494-AE2D-026298207059

Figs 5 , 17–23

Diagnosis

Easily distinguished from closest known relatives ( Pa. casaroro Huber sp. nov.; Pa. camiguin Huber sp. nov.) by short male eye stalks ( Fig. 17 ), and by morphology of male palps ( Figs 18–21 ; symmetric modiFcations of trochanter and femur; asymmetric shapes of procursi); from Pa. casaroro Huber sp. nov. also by simple epigynal scape without pair of semi-transparent lobes ( Fig. 22 ); from Pa. camiguin Huber sp. nov. also by absence of strong transversal sclerite in female internal genitalia ( Fig. 23 ).

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype Ƌ, in ZFMK ( Ar 12998 ), Mindanao , Davao del Sur Province, Malagos Watershed (7.184°N, 125.415°E), 390 m a.s.l., forest along river , on leaves , 14 Feb. 2014 (B.A. Huber, E. Mondejar) .

Other material examined

PHILIPPINES: 1 Ƌ, 2 ♀♀ in ZFMK ( Ar 12999 ) and 1 ♀ in MSU-IIT, same data as holotype ; 1 ♀ in pure ethanol, in ZFMK ( Phi 259 ), same data .

Description

Male (holotype)

MEASUREMENTS. Total body length 4.6, carapace width 0.9. Leg 1: 41.3 (9.7 + 0.4 + 9.8 + 19.4 + 2.0), tibia 2: 6.0, tibia 3: 3.2, tibia 4: 4.9; tibia 1 L/d: 110. Distance PME–PME 270 µm, diameter PME 120 µm, distance PME–ALE ~40 µm; AME absent.

COLOR. Carapace pale ochre yellow with indistinct posterior median mark, ocular area and clypeus brown, black mark in AME area; sternum whitish; legs ochre-yellow with dark brown patellae and tibiametatarsus joints; abdomen ochre-gray, with black marks dorsally, monochromous ventrally.

BODY. Habitus as in Fig. 5 ; ocular area raised, each triad on short stalk, medially with pointed process directed toward frontal and ventral ( Fig. 17 ); carapace without median furrow; clypeus unmodiFed; sternum wider than long (0.65/0.55), unmodiFed.

CHELICERAE. As in Fig. 17 , with simple pair of weakly sclerotized processes in rather frontal position, without modiFed hairs; without stridulatory ridges.

PALPS. As in Figs 18–21 ; proximal segments symmetric in shape but slightly larger on left side (e.g., length and diameter of right tibia about 95–97% of left tibia); coxa with strong ventro-distal rim but otherwise unmodiFed; trochanter with pointed retrolateral apophysis and rounded ventral hump; femur with dorsal hump and weakly sclerotized semitransparent process retrolatero-ventrally; tarsus with long whitish elongation with terminal tarsal organ; procursi of left and right palps strongly different, distal part of procursus clearly hinged in left palp, not hinged in right palp; bulb slightly smaller in right palp, with long processes extending in opposite directions (dorsal embolus; ventral appendix) almost symmetric (slightly longer in left palp).

LEGS. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 3%; prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with> 20 pseudosegments, only distally fairly distinct.

Male (variation)

Not seen. Tibia 1 missing in other male.

Female

In general similar to male but eye triads on low humps and closer together (distance PME–PME 210 µm). Tibia 1 in 3 females: 6.9, 7.0, 7.9. Epigynum large elongate plate, anterior part weakly sclerotized, with symmetric or at most slightly asymmetric internal structures visible through cuticle; posterior part orange, with extensible scape with distinct transversal folds and small median process (“knob”) at tip ( Fig. 22 ); internal genitalia as in Fig. 23 .

Natural history

The spiders were found in very low abundance on the undersides of leaves about 50–200 cm above the ground in a disturbed part of the forest.

Distribution

Known from type locality on Mindanao Island only ( Fig. 16 ).

Figures

Fig. 16. Known distribution of the Panjange lanthana group.

Figs 2 – 15. Live specimens. 2 – 4. Pa. lanthana, Mt. Isarog, Ƌ, ♀ with eggsac, and penultimate Ƌ. 5. Pa. malagos Huber sp. nov., Ƌ. 6 – 7. Pa. casaroro Huber sp. nov., ƋƋ. 8 – 10. Pa. camiguin Huber sp. nov. 8. ♀ with parasitized eggsac, from Camiguin Island. 9. Ƌ from Bohol Island. 10. Ƌ from Camiguin Island. 11 – 13. Pa. dinagat Huber sp. nov., Ƌ, ♀ with eggsac, and penultimate Ƌ. 14 – 15. Pa. marilog Huber sp. nov., ƋƋ showing color variation.

Figs 17 – 19. Panjange malagos Huber sp. nov. (ZFMK, Ar 12999). 17. Male prosoma and chelicerae, frontal view. 18 – 19. Left male palp, prolateral and retrolateral views. Abbreviations: a = appendix; b = genital bulb; e = embolus; h = hinge; p = procursus; ps = proximal bulbal sclerite; pto = palpal tarsal organ; te = tarsal elongation. Scale bars = 0.5 mm.

Figs 20 – 23. Panjange malagos Huber sp. nov. (ZFMK, Ar 12999). 20 – 21. Right male palp, prolateral and retrolateral views. 22 – 23. Cleared female genitalia, ventral and dorsal views. Scale bars = 0.5 mm.