Aetana ocampoi 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 : 9-14

Aetana ocampoi Huber , sp. nov.

urn:lsid:zoobank.org:act:85B2FF02-FB08-48B3-91E9-0AB54D7866F5

Figs 6–7 , 13–25

Diagnosis

Easily distinguished from closest known relatives ( A. libjo Huber , sp. nov.; A. baganihan Huber , sp. nov.) by dark coloration ( Figs 6–7 ) and by several details of the male palp ( Figs 13–14 ; long cylindrical bulb; ventral process on femur), male chelicerae ( Fig. 15 ; more proximal position of apophyses), and epigynum ( Figs 16–19 ; short triangular scape).

Etymology

Named for the Filipino artist Hernando Ruiz Ocampo (1911–1978), famous for his work reflecting the harsh realities of his country after the Second World War, but also for his interest in depicting Philippine flora and fauna.

Material examined

Holotype

PHILIPPINES: ♂, Luzon, Camarines Sur Prov., Mt. Isarog, W slope (13.664° N, 123.34– 123.35° E), ~ 600–900 m a.s.l., forest, near ground, 23 Feb. 2014 (B.A. Huber), ZFMK (Ar 13927).

Other material

PHILIPPINES: Luzon, 1 ♂, 2 ♀♀ (morph A and morph B), same data as holotype, ZFMK (Ar 13928); 3 ♀♀ (2 ♀♀ morph A, 1 ♀ morph B), in pure ethanol, same data, ZFMK (Phi 222).

Description

Male (holotype)

MEASUREMENTS. Total body length 2.7, carapace width 1.1. Leg 1: 28.3 (6.7 + 0.4 + 6.6 + 11.8 + 2.8), tibia 2: 3.9, tibia 3: 2.7, tibia 4: 4.0; tibia 1 L/d: 59. Distance PME-PME 185 µm, diameter PME 125× 120 µm, distance PME-ALE 20 µm; AME absent.

COLOR. Carapace pale ochre with wide median dark band including ocular area and narrower lateral black margins; clypeus pale ochre, distal half light brown; sternum pale ochre, medially light brown; legs light brown, with dark rings subdistally on femora and proximally on tibiae (incl. patellae); abdomen dorsally densely covered with dark marks and some white marks, ventrally gray, small dark mark behind gonopore, larger dark mark in front of spinnerets.

BODY. Habitus as in Figs 6–7 ; ocular area slightly raised, each triad on low hump; carapace only anteriorly with very shallow and narrow median furrow (rather just a dark line); clypeus unmodified; sternum wider than long (0.60/0.55), unmodified.

CHELICERAE. As in Fig. 15 , with pair of frontal apophyses near median line, without proximal lateral apophyses; without modified hairs; without stridulatory ridges.

PALPS. As in Figs 13–14 , coxa unmodified, trochanter on retrolatero-ventral side with large apophysis fused to femur; femur with large retrolatero-ventral process; retrolateral trichobothrium on tibia very distal; tarsus with semitransparent simple procursus; genital bulb large, cylindrical, with retrolateral apophysis proximally and two distinctive processes distally: dorsal process with sclerotized black tip; ventral process with semitransparent flap.

LEGS. Without spines, with curved hairs on tibiae 1 and metatarsi 1–4, few vertical hairs; retrolateral trichobothrium on tibia 1 at 3%; prolateral trichobothrium absent on tibia 1, present on other tibiae. Tarsus 1 with ~25 pseudosegments, distally distinct.

Male (variation)

Tibia 1 in other male: 7.2; this male paler but otherwise identical.

Female

In general similar to male; eye triads closer together (distance PME-PME 140 µm); tibia 1 in 2 females: 5.5, 5.7. Epigynum apparently dimorphic: three females with small triangular sclerotized scape ( Figs 16 , 20 ; morph A), two females with much wider sclerotized area of epigynum ( Figs 18 , 23 ; morph B); internal genitalia also different, as in Figs 17, 19 , 22, 25 .

Natural history

The spiders were found close to the ground, apparently more deeply hidden under rocks and logs than the sympatric A. lozadae Huber , sp. nov.

Distribution

Known from type locality only ( Fig. 3 ).

Figures

Figs 6–12. Live specimens. Aetana ocampoi group. 6–7. A. ocampoi Huber, sp. nov., ♂ from Mt. Isarog, Luzon. 8–9. A. libjo Huber, sp. nov., ♂ and ♀ from Dinagat Island, Mindanao. 10–12. A. baganihan Huber, sp. nov., ♂♂ from Baganighan, Mindanao.

Figs 13–15. Aetana ocampoi Huber, sp. nov. 13–14. Left male palp, prolateral and retrolateral views (asterisk: retrolateral process of bulb). 15. Male chelicerae, frontal view. b = genital bulb; p = procursus. Scale lines: 13–14 = 0.5 mm; 15 = 0.2 mm.

Figs 16–19. Aetana ocampoi Huber, sp. nov. Cleared female genitalia of morph A (16–17) and morph B (18–19), in ventral (left) and dorsal (right) views. Scale line: 0.5 mm (all at same scale).

Figs 20–25. Aetana ocampoi Huber, sp. nov. Female genitalia of morph A (20–22) and morph B (23– 25); untreated in ventral view, cleared in ventral and dorsal views.

Figs 3–4. Known distributions of the Aetana ocampoi (3) and A. kiukoki (4) groups. The question mark denotes a female specimen assigned tentatively to A. kiukoki.