Chibchea tunebo Huber, 2000

Huber, Bernhard A. & Villarreal, Osvaldo, 2020, On Venezuelan pholcid spiders (Araneae, Pholcidae), European Journal of Taxonomy 718, pp. 1-317: 44-46

publication ID

https://doi.org/10.5852/ejt.2020.718.1101

publication LSID

lsid:zoobank.org:pub:F9E9A91E-488C-4DB1-9361-E788E9AC5BC1

DOI

http://doi.org/10.5281/zenodo.4343809

persistent identifier

http://treatment.plazi.org/id/03E887AD-FFFB-7A2C-FDED-FD38F80CFDBA

treatment provided by

Valdenar

scientific name

Chibchea tunebo Huber, 2000
status

 

Chibchea tunebo Huber, 2000  

Figs 110–111 View Figs 106–111 , 127 View Figs 121–127 , 134–140 View Figs 134–140 , 1035

Chibchea tunebo Huber, 2000: 171   , figs 652–655 (♂).

Diagnosis

Distinguished from similar congeners ( C. merida Huber, 2000   ; C. thunbergae Huber   sp. nov.; C. danielae Huber   sp. nov.) by male chelicerae ( Huber 2000: fig. 652; long hairs proximally, deep frontal invagination, short spine-like hairs distally) and by female internal genitalia ( Figs 127 View Figs 121–127 , 137 View Figs 134–140 ; Y-shaped anterior receptacle).

Type material

VENEZUELA   – Táchira • ♂ holotype, AMNH, Pregonero, “2nd forest road at Camp Siberia”, 1280 m a.s.l. [approximately 7.893° N, 71.719° W], 10–13 Jul. 1989 (S. & J. Peck) GoogleMaps   .

New record

VENEZUELA   – Táchira • 3 ♂♂, 6 ♀♀, 2 juvs, ZFMK (Ar 21845), and 4 ♀♀, 4 juvs in pure ethanol, ZFMK (Ven20-120), SE Pregonero, forest near La Trampa (7.9236° N, 71.7152° W), 1300 m a.s.l., 10 Feb. 2020 (B.A. Huber, O. Villarreal M., Q. Arias C.) GoogleMaps   .

Assigned tentatively

VENEZUELA   – Mérida • 5 ♂♂, 1 ♀, ZFMK (Ar 21846), and 4 ♀♀, 1 juv. in pure ethanol, ZFMK (Ven20-135), forest above Caño Azul (8.8543° N, 71.3651° W), 280 m a.s.l., 13 Feb. 2020 (B.A. Huber, O. Villarreal M., Q. Arias C.) GoogleMaps   1 ♂, 3 ♀♀, 1 juv., ZFMK (Ar 21847), and 3 ♀♀ in pure ethanol, ZFMK (Ven20-109), Las Piedras , ‘site 2’ (8.9002° N, 70.6279° W), 1700 m a.s.l., degraded forest, 7 Feb. 2020 (B.A. Huber, O. Villarreal M., Q. Arias C.) GoogleMaps   .

Note

We were not  able to exactly locate the type locality “2 nd forest road at Camp Siberia”, but “Campamento Siberia” is at 3 km from our new collecting site, suggesting that the new site is within a few km from the type locality.

Redescription of male (amendments; see Huber 2000)

Measurements (male from near La Trampa): Total body length 2.4, carapace width 0.9. Distance PME– PME 80 µm; diameter PME 90 µm; distance PME–ALE 80 µm; distance AME–AME 15 µm; diameter AME 20 µm. Leg 1: 19.1 (4.4 +0.3+ 4.6+8.4+ 1.4), tibia 2: 3.0, tibia 3: 2.4, tibia 4: 3.2; tibia 1 L/d: 61. Pair of lateral distal patches of short modified hairs situated on low light brown humps. Retrolateral

trichobothrium on tibia 1 at 10%; prolateral trichobothrium absent on tibia 1. Tibia 1 in three other newly collected males from near La Trampa: 4.2, 4.5, 4.7.

Males from Caño Azul are slightly smaller (tibia 1 in five males: 3.6–4.2, mean 3.9) but appear otherwise indistinguishable from males from near La Trampa. They are assigned tentatively because of the accompanying females (see below).

The male from Las Piedras has considerably shorter legs (tibia 1: 3.2), and the spines on the chelicerae are not  divided into two patches on each side; the palps appear identical to males from La Trampa.

Description of female

Female in general very similar to male ( Fig. 111 View Figs 106–111 ). Epigynum simple, weakly curved transversal plate, without posterior plate ( Fig. 134 View Figs 134–140 ). Internal genitalia ( Figs 127 View Figs 121–127 , 137–138 View Figs 134–140 ) with pair of large oval pore plates, anterior transparent receptacle Y-shaped. Tibia 1 in six females: 3.2–3.6 (mean 3.4).

Females from Caño Azul are slightly smaller (tibia 1 in five females: 2.7–3.0, mean 2.9) and have a slightly longer but narrower epigynal plate ( Fig. 135 View Figs 134–140 ; length/width: 0.22/0.34, versus 0.20/ 0.40 in females from near La Trampa). They are therefore assigned tentatively. The internal genitalia appear largely identical (large oval pore plates; Y-shaped anterior receptacle).

Females from Las Piedras are slightly smaller (tibia 1 in six females: 2.7–3.0, mean 2.8) and the posterior epigynal margin is protruding rather than indented ( Fig. 136 View Figs 134–140 ); the internal genitalia ( Figs 139–140 View Figs 134–140 ) differ slightly in the shape of the pore plates (narrowing laterally) and in the shape of the receptacle (widened posteriorly rather than Y-shaped). They are therefore assigned tentatively.

Distribution

Known from three localities in the Venezuelan states Táchira and Mérida (Fig. 1035); however, specimens from Mérida are assigned tentatively.

Natural history

At all three new localities, the spiders were found in the leaf litter, in curved leaves that provided space for the small, weakly domed webs.

AMNH

USA, New York, New York, American Museum of Natural History

ZFMK

Germany, Bonn, Zoologische Forschungsinstitut und Museum "Alexander Koenig"

AMNH

American Museum of Natural History

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Chibchea

Loc

Chibchea tunebo Huber, 2000

Huber, Bernhard A. & Villarreal, Osvaldo 2020
2020
Loc

Chibchea tunebo

Huber B. A. 2000: 171
2000