Research Article |
Corresponding author: Andrés F. García ( agarciarinc@gmail.com ) Academic editor: Danilo Harms
© 2022 Andrés F. García, Daniela Ahumada-C..
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
García AF, Ahumada-C D (2022) Taxonomic notes on Barinas: a new generic synonym, a new cave-dwelling species, and new records from Colombia (Arachnida, Opiliones, Agoristenidae). Evolutionary Systematics 6(1): 1-7. https://doi.org/10.3897/evolsyst.6.78123
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Barinas guanenta sp. nov. is described from a cave in Santander, central Andes of Colombia. The new species is recognized by the pedipalps and chelicerae entirely pale yellow and without variegated pattern, the areas I-IV with variegated coloration pattern and the straight stylus of the penis. The monotypic genus Vimina González-Sponga, 1987 is synonymized with Barinas, resulting in Barinas virginis (González-Sponga, 1987) comb. nov. New records of Barinas piragua Ahumada-C. & García, 2020 in La Guajira, Northern Colombia, are given. A key for the species of Barinas is given together with an updated distribution map.
biodiversity, harvestmen, Leiosteninae, taxonomy, Vimina
The taxonomy of the Neotropical subfamily Leiosteninae Šilhavý, 1973 (12 gen., 59 spp.), widespread in northern South America, has recently aroused the interest of some researchers, resulting in several papers focused on nomenclatural acts (
To continue on this path, the present work brings taxonomical novelties of the genus Barinas González-Sponga, 1987, that currently groups two species: the type species, Barinas flava González-Sponga, 1987 (from the Andean slopes of Venezuela), and Barinas piragua Ahumada-C. & García, 2020 (from the Caribbean region of Colombia), both characterized by the paired armature in the scutal areas I-IV and the stylus of penis dorsally curved (
After the revision of harvestmen material from Colombia and Venezuela, we noted that the monotypic genus Vimina González-Sponga, 1987, whose type species was described from a locality near to that of B. flava, should be synonymized with Barinas. Besides that, a new cave-dwelling species from the Andean region of Colombia was found. So, a new diagnosis for Barinas, a generic synonym with its subsequent new combination, the description of the new Colombian species, and new records for B. piragua are proposed.
Individuals were photographed using a Leica M205C stereoscope attached to a Leica DFC450 digital camera. The resultant images were posteriorly edited in Photoshop CC 2014 software. Drawings were made using the software Inkscape 0.91. Descriptions of colors use the standard names of the 267 Color Centroids of the NBS/IBCC Color System as named in
Patterns of description and AHF (armature height formula, height differences between the armature on the mesotergal areas, where roman numerals represent the corresponding mesotergal area) follow Ahumada-C. et al. (
Morphology abbreviations are AL―maximum abdominal scutum length, AW―maximum dorsal scutum width, ChL―chelicera length, CL―carapace length, CW―maximum carapace width, DH―dorsal hump, DP―dorsal process, DS―dorsal scutum, DSL―dorsal scutum length, Fe―femur, IOD―interocular distance, LP―lamina parva, MS―macrosetae of the penis, Mt―metatarsus, Pa―patella, Ta―tarsus, Ti―tibia, TL―total length, Tr―trochanter. All measurements are in mm unless otherwise noted.
The specimens are deposited in the following institutions: CBUDC―Colección de Ejemplares Biológicos de la Universidad de Cartagena (Cartagena de Indias, Colombia);
Order Opiliones Sundevall, 1833
Family Agoristenidae Šilhavý, 1973
Subfamily Leiosteninae Šilhavý, 1973
Barinas
Vimina
Barinas flava González-Sponga, 1987, by original designation.
DS Epsilon type 1. Ocularium low, smooth, or with paired high spines (Barinas piragua). Mesotergal areas I–IV with paired paramedian spines (AHF: I < II = III = IV in B. flava, I = II < IV < III in B. piragua, II = I<III = IV in B. virginis comb. nov., and I = IV < II = III in B. guanenta sp. nov.). Posterior margin, free tergites, and anal operculum armed (with tubercles in B. flava, B. virginis comb. nov. and B. guanenta sp. nov.; with spines in B. piragua). Pedipalps concolor with the body (B. flava and B. virginis comb. nov.; lighter than the body in B. piragua and B. guanenta sp. nov.). Coxae I–IV with one anterolateral tubercle dorsally projected. Fe IV length/DSL ratio: less than three in B. virginis comb. nov (1.93) and B. flava (2.58); more than three in B. piragua (3.4) and B. guanenta sp. nov. (3.38). Lamina parva crescent-shaped (in B. flava seems heart-shaped) and with very short corners that do not exceed the insertion point of the MS-A2. Malleus with two pairs of trifid MS-A, one pair of trifid MS-B, two pairs of MS-D, one pair of large and trifid MS-E2, and one pair of MS-E1 (in B. piragua short an conical, in B. guanenta medium-sized and elongated; unknown in B. flava and B. virginis comb. nov.). Stylus elongated, curved dorsally at distal portion (straight in B. guanenta sp. nov.), smooth (in B. flava and B. virginis comb. nov.; with a dorsal hump close to the union of the DP with the stylus in B. piragua and B. guanenta sp. nov.), and with a sharp proximal DP (blunt in B. virginis comb. nov.).
Barinas flava González-Sponga, 1987, Barinas guanenta sp. nov., Barinas piragua Ahumada-C. & García, 2020, Barinas virginis (González-Sponga, 1987) comb. nov.
An emended diagnosis comparing Barinas with the remaining genera of Leiosteninae was offered by Ahumada-C. et al. (
1 | Ocularium with paired spines; tarsus and claw of pedipalp of different coloration than the other pedipalpal segments | B. piragua |
– | Ocularium smooth; all segments of pedipalp of the same coloration | 2 |
2 | Paramedian armature of mesotergal area IV of the same size as that of area III; stylus curved distally | 3 |
– | Paramedian armature of mesotergal area IV smaller than that of area III; stylus straight | B. guanenta sp. nov. |
3 | Paramedian armature of mesotergal area II smaller than that of area III; dorsal connective tissue between the stylus and the dorsal process present (Fig. |
B. virginis comb. nov. |
– | Paramedian armature of mesotergal area II same size as that of area III; dorsal connective tissue between the stylus and the dorsal process absent (figs 1D-F in |
B. flava |
Colombia• ♂ holotype: Santander, Cabrera, Cueva del Indio de Doña Joaquina; [6.562261; – 73.237897]; [1100 m]; 14 July 2007; Ca-vita grupo de bioespeleologia leg.;
Guanentá was the leader of the Guanes, an indigenous group that fought bravely against the Spanish conquerors in the region where the species was collected. Noun in apposition.
Can be distinguished by having pedipalps entirely pale yellow without variegated pattern (in B. piragua distal portion of Tr and Fe black, and tarsi entirely black; in B. virginis comb. nov. with a variegated pattern on Fe-Ti); variegated coloration on areas I-IV (B. flava and B. piragua without variegated coloration); stylus of penis straight (in all other Barinas species the stylus is curved at apical portion) (Figs
Photographs of Barinas guanenta sp. nov. (
Drawings of Barinas guanenta sp. nov. Male holotype (
(Figs
Female paratype (
Known only from the type locality, a cave in the Magdalena Valley montane forest ecoregion (NT0136) (Fig.
Vimina virginis
Venezuela• ♂ holotype: Trujillo, Trujillo, Cerro de La Virgen, environs of Trujillo; [9.349513, -70.457898]; 1100 m; A.R. Delgado de González, J.A. González Delgado y M.A. González-Sponga leg.;
Venezuela• 3 ex.: Trujillo, Cerro La Virgen; 1100 m; 28 July 2006; O. Villarreal leg.;
DS Epsilon type 2 (Fig.
Barinas virginis (González-Sponga, 1987) comb. nov. (MAGS 852), male. Habitus in dorsal (A), panoramic (B), frontal (C), lateral (D), and posterior (E) views. Penis drawings (F) of holotype (
It seems that MS-D and MS-E1 went unnoticed or ignored in some works of
Barinas piragua:
Colombia: Bolívar and Magdalena departments.
Colombia• 2 ♀: La Guajira, Hatonuevo, Cerro Bañaderos, 11°7’33.3"N, 72°47’06.9"W [11.125899, –72.785241]; 785 m; 19 May 2018; Miguel Gutiérrez leg.; CBUDC-ARA 346.
The penis of the Barinas species shows remarkable characters, as the short size of the corners of the LP and the shape of the stylus. For the first case, the genus has a LP with very short corners that do not exceed the insertion point of the MS-A2 (just known in Paravima Caporiacco, 1951 as far as we know). On the other hand, the distal half of the stylus exhibits a 45-degree curvature at the dorsal region (except B. guanenta sp. nov) not present in the other Leiosteninae genera. Nevertheless, the presence of paired armature in all the mesotergal areas plus the basal DP on the stylus is a combination of characters exclusive of Barinas, so, we do no doubt about the inclusion of B. guanenta sp. nov. in it.
Additionally, we noted that B. flava lacks additional ornamentations above the insertion point of the DP (see
Finally, we would like to reinforce the importance to do scientific expeditions in the cave systems in Colombia, mainly because those have perfect conditions of humidity and darkness for the harvestmen. Besides B. guanenta, there are three oficial records of the order Opiliones in caves: Andrescava sturmi Roewer, 1963 (Agoristenidae) in National Natural Park Cueva de los Gúacharos (Huila); Phareus antrophilus Villarreal & Rodríguez, 2006 (Stygnidae), in Gámbita (Santander); and Phalangodus briareos Villarreal & García, 2016 (Cranaidae), from Zapatoca (Santander) (
Thanks to Eduardo Flórez for the loan of material from the