Guaranita dobby Torres et al., 2016

Huber, Bernhard A., Meng, Guanliang, Král, Jiří, Ávila Herrera, Ivalú M. & Izquierdo, Matías A., 2023, Revision of the South American Ninetinae genus Guaranita (Araneae, Pholcidae), European Journal of Taxonomy 900 (1), pp. 32-80 : 41-46

publication ID

https://doi.org/ 10.5852/ejt.2023.900.2301

publication LSID

lsid:zoobank.org:pub:D4F7B982-843D-413C-ADE6-B84AB49FFEAB

DOI

https://doi.org/10.5281/zenodo.10064431

persistent identifier

https://treatment.plazi.org/id/7F0B87C4-FFA9-8032-FDC2-FD8EFEE8FD89

treatment provided by

Plazi

scientific name

Guaranita dobby Torres et al., 2016
status

 

Guaranita dobby Torres et al., 2016 View in CoL

Figs 2A – B View Fig , 3 – 7 View Fig View Fig View Fig View Fig View Fig , 32A View Fig

Guaranita dobby Torres et al., 2016: 9 View in CoL View Cited Treatment , figs 6 – 12 (♂).

Diagnosis (amendments; see Torres et al. 2016)

Distinguished from known congeners by median process on male clypeus (cf. Torres et al. 2016: fig. 9; unmodified in congeners), by male cheliceral apophyses ( Fig. 4A – C View Fig ; short and diverging in distal view), by very small (compared with congeners) dorsal flap on procursus ( Fig. 4F View Fig ), and by roughly triangular (rather than trapezoidal as in congeners) anterior epigynal plate ( Fig. 5A View Fig ); also by relatively slender male palpal tibia ( Fig. 3C View Fig ; width/length 0.75; other species 0.85 – 1.00) and by female internal genitalia ( Figs 5C – D View Fig , 32A View Fig ; median structure poorly developed compared with congeners); from G. auadae sp. nov. and G. goloboffi also by narrow distal bulbal sclerite ( Fig. 4G View Fig ).

Material examined (new record)

ARGENTINA – Salta • 2 ♂♂, 3 ♀♀; ~ 55 km NW of Campo Quijano; 24.4716° S, 65.9272° W; 3040 m a.s.l.; 19 Mar. 2019; B.A. Huber and M.A. Izquierdo leg.; ZFMK Ar 24121 GoogleMaps 11 ♀♀ in pure ethanol (four prosomata used for molecular work; one female and one female abdomen used for SEM); same collection data as for preceding; ZFMK Arg187 GoogleMaps 2 ♀♀; same collection data as for preceding; LABRE-Ar 876 GoogleMaps 1 ♀, in pure ethanol; same collection data as for preceding; LABRE-Ar 865 GoogleMaps .

Redescription of male (amendments; see Torres et al. 2016)

Measurements of male from 55 km NW of Campo Quijano: total body length 1.1 (1.2 with clypeus process), carapace width 0.48; distance PME–PME 45 µm; diameter PME 40 µm; distance PME–ALE 20 µm; distance AME–AME 20 µm; diameter AME 25 µm. Leg 1: 2.33 (0.66 +0.16 + 0.62 +0.55 +0.34), tibia 2: 0.54, tibia 3: 0.48, tibia 4: 0.72; tibia 1 L/d: 9; diameters of leg femora 0.10 – 0.11, of leg tibiae: 0.065. Tibia 1 of second newly collected male: 0.58. Tip of clypeus process straight but at tip with hairs pointing upwards and backwards. Sternum slightly wider than long (0.34/0.30). Chelicerae as in Fig. 4A – C View Fig . Pedipalp as in Fig. 3A – C View Fig ; tibia with two trichobothria; procursus as in Fig. 4D – F View Fig , with large transparent ventral membrane, distinctive dorsal flap, and tip bent towards dorsal; genital bulb as in Fig. 4G – I View Fig , with simple proximal sclerite and band-like distal sclerite (same width over most of its length). Legs without spines and curved hairs; vertical hairs not seen; retrolateral trichobothrium of tibia 1 at 60%; prolateral trichobothrium absent on tibia 1, present on other leg tibiae; tarsus 1 with 5 pseudosegments, poorly visible in dissecting microscope.

Description of female

In general similar to male ( Fig. 2A – B View Fig ) but clypeus without process, sternum without pair of anterior humps, and chelicerae without stridulatory files. Tibia 1 in seven females: 0.58 – 0.64 (mean 0.62). Epigynum ( Figs 5A View Fig , 6B View Fig ) with simple triangular anterior plate weakly bulging; posterior plate short and simple. Internal genitalia ( Figs 5C – D View Fig , 32A View Fig ) very simple, with median sclerotized structure (receptacle?), apparently with small pore plates. Each ALS with one strongly widened spigot, one long pointed spigot, and five cylindrical spigots (of which one is much wider than the others; Fig. 6C View Fig ); each PMS with two conical spigots ( Fig. 6D View Fig ); PLS without spigots. Leg tibiae and metatarsi with tiny pores with cuticular rim (pore diameter 0.6 µm; Fig. 6E – F View Fig ) and with small round cuticular ‘plates’ (diameter 4 – 5 µm; Fig. 6E View Fig ). Tarsal organs with very small openings (diameters of openings 0.8 – 0.9 µm; Fig. 7D – E View Fig ). Metatarsi 3 and 4 with one long slender hair each on retrolateral side ( Fig. 7C View Fig ).

Remarks (notes on type locality)

This species was previously known from two specimens supposedly from two localities in Salta province: the holotype locality, 9 km E of Cabra Corral dam; and a second locality, 1 km N of “Charrillos” (should be Chorrillos). Our newly collected specimens of G. dobby are from close to the second locality, in the same river valley, ~ 37 km NW of Chorrillos. However, we failed to find G. dobby at the holotype locality and at several nearby sites E of Cabra Corral dam we visited. Instead, we found G. goloboffi at two sites in that area. Previous collectors also found numerous specimens of G. goloboffi E of Cabra Corral dam ( Torres et al. 2015). This sheds doubt on the origin of the G. dobby holotype. We suspect that the holotype specimen is mislabeled but according to José Corronca (pers. com. Jan. 2022) this is unlikely to be the case.

Natural history

The newly collected specimens were found under rocks in a very arid environment ( Fig. 34A View Fig ). Egg sacs (N = 4) contained 6 – 8 eggs and were carried in a single layer under the prosoma ( Fig. 2B View Fig ); egg diameter: 0.46 – 0.48.

Distribution

Known from three localities in Argentina, Salta Province ( Fig. 33A View Fig ); but see Notes on type locality above.

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Guaranita

Loc

Guaranita dobby Torres et al., 2016

Huber, Bernhard A., Meng, Guanliang, Král, Jiří, Ávila Herrera, Ivalú M. & Izquierdo, Matías A. 2023
2023
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