Aetana libjo Huber, 2015

Huber, Bernhard A., Nuñeza, Olga M. & Ung, Charles Leh Moi, 2015, Revision, phylogeny, and microhabitat shifts in the Southeast Asian spider genus Aetana (Araneae, Pholcidae), European Journal of Taxonomy 162, pp. 1-78 : 14-19

publication ID 10.5852/ejt.2015.162

publication LSID


persistent identifier

taxon LSID

treatment provided by


scientific name

Aetana libjo Huber

sp. nov.

Aetana libjo Huber View in CoL , sp. nov.

Figs 8–9 View Figs 6–12 , 26–40 View Figs 26–29 View Figs 30–37 View Figs 38–44. — 38–40 , 45–47 View Figs 45–50


Distinguished from the very similar A. baganihan Huber , sp. nov. by shapes of bulbal processes (compare Figs 38–39 and 41–42 View Figs 38–44. — 38–40 ), by shorter male palpal tibia (2.1–2.4 × longer than wide vs. 2.9–3.2 in A. baganihan Huber , sp. nov.), and by shorter epigynum and wider scape (compare Figs 28 View Figs 26–29 and 43 View Figs 38–44. — 38–40 ). Distinguished from next closest known relative ( A. ocampoi Huber , sp. nov.) by light coloration and several details of male palp and epigynum (especially shapes of bulb and scape; Figs 26–28 View Figs 26–29 ). From all other congeners by simple procursus and complex bulbal processes ( Figs 26–27 View Figs 26–29 ) and by narrow epigynal scape.


Named for the type locality; noun in apposition.

Material examined


PHILIPPINES: ♂, Dinagat Isl., near Libjo, Paragua Forest , ‘site 1’ (10.222° N, 125.553° E), 130 m a.s.l., forest at brook, among low vegetation, 20 Feb. 2014 (B.A. Huber), ZFMK (Ar 13929).


Other material

PHILIPPINES: 6 ♂♂, 9 ♀♀, same data as holotype, ZFMK (5♂♂, 8♀♀) (Ar 13930–31) and MSU-IIT (1 ♂, 1 ♀); 3 juveniles in pure ethanol, same data, ZFMK (Phi 231).


Male (holotype)

MEASUREMENTS. Total body length 3.1, carapace width 1.1. Leg 1: 37.4 (9.0 + 0.5 + 8.8 + 16.2 + 2.9), tibia 2: 5.1, tibia 3: 3.3, tibia 4: 4.8; tibia 1 L/d: 74. Distance PME-PME 270 µm, diameter PME 125× 95 µm, distance PME-ALE 20 µm; AME absent.

COLOR. Carapace ochre-yellow with black lateral margins, dark mark behind ocular area and dark median mark on posterior rim; ocular area and clypeus pale ochre; sternum bright orange; leg coxae ochre-yellow, other leg segments greenish-ochre (especially femora) to light brown (distal segments); abdomen grey with distinct dorsal and lateral pattern of black marks, ventrally with brown band between gonopore and spinnerets (mid-section indistinct).

BODY. Habitus as in Fig. 8 View Figs 6–12 ; ocular area slightly raised, each triad on low hump directed toward lateral; carapace only anteriorly with very shallow and narrow median furrow; clypeus barely modified, indistinct median process near rim provided with some slightly stronger hairs; sternum wider than long (0.70/0.55), unmodified. Gonopore with four epiandrous spigots in two pairs ( Fig. 37 View Figs 30–37 ). ALS as in female (cf. Fig. 36 View Figs 30–37 ).

CHELICERAE. As in Fig. 40 View Figs 38–44. — 38–40 , with pair of ridge-shaped apophyses distally near median line, without proximal lateral apophyses; without modified hairs; without stridulatory ridges.

PALPS. As in Figs 26–27 View Figs 26–29 , coxa unmodified, trochanter on retrolateral side with large apophysis fused to femur; femur with small retrolateral process distally; tibia length/width: 0.50/0.22; retrolateral trichobothrium on tibia very distal; tarsus with semitransparent simple procursus directed toward patella; tarsal organ exposed ( Fig. 35 View Figs 30–37 ); genital bulb large, with small retrolateral process proximally and three distinctive processes distally ( Figs 30–31, 33 View Figs 30–37 , 38–39 View Figs 38–44. — 38–40 ): dorsal process with distal hook; central hinged process with large prolateral flap and complex tip; ventral hinged process with simple pointed tip. Location of sperm duct opening unknown.

LEGS. Without spines, with curved hairs on metatarsi, with vertical hairs in higher than usual density in one retrolatero-dorsal row on each tibia; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium absent on tibia 1, present on other tibiae. Tarsus 1 with ~30 pseudosegments, distally distinct. Tarsus 4 comb-hairs with very dense tines ( Fig. 32 View Figs 30–37 ).

Male (variation)

Tibia 1 in 6 other males: 8.3–9.0 (mean 8.6); ratio of palpal tibia length/width: 2.1–2.4. Some specimens with white marks on abdomen in addition to black marks.


In general similar to male ( Fig. 9 View Figs 6–12 ); eye triads closer together (distance PME-PME 215 µm); clypeus unmodified; tibiae with short vertical hairs in low density; entire median area of carapace darker; clypeus also slightly darker; abdomen with or without white marks; tibia 1 in 9 females: 6.2–7.2 (mean 6.7). Epigynum with large, weakly sclerotized area, posteriorly protruding with short, narrow scape ( Figs 28 View Figs 26–29 , 45–46 View Figs 45–50 ); internal genitalia with large median membranous structure of unknown function ( Fig. 29 View Figs 26–29 ).

Natural history

The spiders were found in strongly domed webs among the vegetation. When disturbed, they ran a short distance in the dome, vibrated vigorously for a short time, and then made slow circular movements with their abdomen. Males and females were often found close to each other, but always in separate webs. The locality is shared with the ground-dwelling A. paragua Huber , sp. nov.


Known from type locality only ( Fig. 3 View Figs 3–4 ).


Zoologisches Forschungsmuseum Alexander Koenig













GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF