Metagonia guianesa Huber, 2020

Huber, Bernhard A. & Villarreal, Osvaldo, 2020, On Venezuelan pholcid spiders (Araneae, Pholcidae), European Journal of Taxonomy 718, pp. 1-317 : 181-184

publication ID

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

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.14371466

persistent identifier

https://treatment.plazi.org/id/C22A01AC-C7D8-48A6-B50D-21986D8035D1

taxon LSID

lsid:zoobank.org:act:C22A01AC-C7D8-48A6-B50D-21986D8035D1

treatment provided by

Valdenar (2020-10-06 21:59:10, last updated 2024-12-10 23:54:02)

scientific name

Metagonia guianesa Huber
status

sp. nov.

Metagonia guianesa Huber View in CoL sp. nov.

urn:lsid:zoobank.org:act:C22A01AC-C7D8-48A6-B50D-21986D8035D1

Figs 646–649 View Figs 646–649 , 654–656 View Figs 650–656 , 1052

Metagonia Ven View in CoL 54 – Eberle et al. 2018 (molecular data). — Huber et al. 2018: 71.

Diagnosis

Distinguished from most congeners by unmodified male chelicerae, by modifications of male clypeus ( Fig. 648 View Figs 646–649 ; two pairs of light rounded processes at rim), and by female internal genitalia ( Figs 649 View Figs 646–649 , 655– 656 View Figs 650–656 ; elongate median receptacle). From a very similar closely related undescribed relative from Brazil (“ M. Br16-216” in Eberle et al. 2018; Huber et al. 2018) by minor details of procursus and clypeus shape.

Etymology

The species name refers to the type locality of this species in the Guiana Highlands; adjective.

Type material VENEZUELA – Bolívar • ♂ holotype, ZFMK (Ar 22018), at km 109 from El Dorado (6.013° N, 61.391° W), ~ 800 m a.s.l., 3 Dec. 2002 (B.A. Huber). GoogleMaps

Other material examined

VENEZUELA – Bolívar • 1 ♂, 4 ♀♀, ZFMK (Ar 22019), 1 ♀, 13 juvs in pure ethanol, ZFMK (Ven 02/100-54), same collection data as for holotype GoogleMaps 2 ♀♀, ZFMK (Ar 22020), at km 102 from El Dorado (6.063° N, 61.400° W), ~ 500 m a.s.l., 2 Dec. 2002 (B.A. Huber) GoogleMaps .

Description

Male (holotype)

MEASUREMENTS. Total body length 2.7, carapace width 0.87. Distance PME–PME 135 µm; diameter PME 90 µm; distance PME–ALE 15 µm; AME absent. Leg 1: 27.9 (6.8+0.4 +6.6+ 12.4 +1.7), legs 2 and 4 missing, tibia 3: 2.7; tibia 1 L/d: 73.

COLOR (in ethanol). Entire prosoma pale ochre-yellow to whitish; legs ochre-yellow, with darker (brown to black) patellae and tibia-metatarsus joints; abdomen monochromous whitish.

BODY. Habitus as in Brazilian Metagonia ‘Br16-216’ (cf. Fig. 644 View Figs 640–645 ). Ocular area barely raised. Carapace without thoracic groove. Clypeus with two pairs of light rounded processes at rim ( Fig. 648 View Figs 646–649 ). Sternum slightly wider than long (0.58/0.50), unmodified. Abdomen elongate, dorsally projecting beyond spinnerets.

CHELICERAE. Unmodified (except indistinct widening proximally laterally; Fig. 648 View Figs 646–649 ).

PALPS. As in Figs 646–647 View Figs 646–649 ; coxa unmodified; trochanter with rounded retrolateral ventral apophysis; femur with pair of low ventral humps; retrolateral trichobothrium on tibia in very distal position; procursus with simple pale ventral hinged process, main branch divided distally into retrolateral and prolateral sclerites connected by complex membranous elements; retrolateral part distinctively bent toward ventral, prolateral part with short subdistal branch; genital bulb with indistinct dorsal coneshaped hump, embolus simple, with distal spine.

LEGS. Without spines and curved hairs, few vertical hairs; retrolateral trichobothrium of tibia 1 at 8%; prolateral trichobothrium absent on tibia 1; tarsus 1 with>20 pseudosegments, poorly visible in dissecting microscope.

Male (variation)

Legs 1 missing in second male.

Female

In general similar to male (cf. Fig. 645 View Figs 640–645 ). Tibia 1 in five females: 5.3–5.7 (mean 5.5). Epigynum ( Fig. 654 View Figs 650–656 ) unsclerotized simple plate, with small knob-shaped structure at posterior rim, internal receptacle visible in uncleared specimens. Internal genitalia ( Figs 649 View Figs 646–649 , 655–656 View Figs 650–656 ) apparently symmetric, with elongate median receptacle, small pore plates far apart.

Distribution

Known from two neighboring localities in the Venezuelan state Bolívar (Fig. 1052).

Natural history

All specimens were collected from the undersides of leaves.

Eberle J., Dimitrov D., Valdez-Mondragon A. & Huber B. A. 2018. Microhabitat change drives diversification in pholcid spiders. BMC Evolutionary Biology 18: 141. https: // doi. org / 10.1186 / s 12862 - 018 - 1244 - 8

Huber B. A., Eberle J. & Dimitrov D. 2018. The phylogeny of pholcid spiders (Araneae, Pholcidae): a critical evaluation of relationships suggested by molecular data. ZooKeys 789: 51 - 101. https: // doi. org / 10.3897 / zookeys. 789.22781

Gallery Image

Figs 646–649. Metagonia guianesa Huber sp. nov.; from Bolívar, km 109 from El Dorado (type locality; ZFMK Ar 22019). 646–647. Left male pedipalp, prolateral and retrolateral views. 648. Male ocular area, clypeus, and chelicerae, oblique frontal view. 649. Cleared female genitalia, dorsal view. Scale lines: 0.3 mm.

Gallery Image

Figs 650–656. Metagonia Simon, 1893; epigyna, ventral views and cleared female genitalia, ventral and dorsal views. 650–653. M. latigo Huber sp. nov.; ‘left-sided’ and ‘right-sided’ females (both cleared genitalia in dorsal views) from Falcón, Cerro Santa Ana (type locality; ZFMK Ar 21999). 654– 656. M. guianesa Huber sp. nov.; from Bolívar, km 109 from El Dorado (type locality; ZFMK Ar 22019).

Gallery Image

Figs 640–645. Metagonia Simon, 1893; live specimens. 640–643. M. mariguitarensis (González- Sponga, 1998); males and females with egg sacs from Bolívar, Ciudad Guayana. 644–645. M. sp. ‘Br16- 216’ (undescribed); from Brazil, Manaus, Reserve Ducke; this species is very similar to M. guianesa Huber sp. nov.; of which no live photos are available.

ZFMK

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

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Metagonia