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Two new Colombian harvestmen of the genus Vima (Arachnida: Opiliones: Agoristenidae)
Dos nuevos opiliones colombianos del género Vima (Arachnida: Opiliones: Agoristenidae)
DOI:
https://doi.org/10.15446/caldasia.v45n3.104379Palabras clave:
Diversity, Laniatores, Leiosteninae, taxonomy (en)Diversidad, Laniatores, Leiosteninae, taxonomia (es)
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Two new Colombian species of the genus Vima Hirst, 1912 are described: Vima dilectus sp. nov. from the Meta department, and Vima bellator sp. nov. from the Santander department. Both species are consistent with the current diagnosis of Vima. Consequently, the genus distribution is expanded northwards. An updated distribution map and an identification key to the Vima species are provided.
Se describen dos nuevas especies colombianas del género Vima Hirst, 1912: Vima dilectus sp. nov. del departamento del Meta y Vima bellator sp. nov. del departamento de Santander. Ambas especies se ajustan perfectamente a la diagnosis actual de Vima, por lo que la distribución del género es expandida hacia el norte. Se proporciona un mapa de distribución y una clave de identificación de las especies de Vima.
Recibido: 14 de octubre de 2022; Aceptado: 3 de abril de 2023
ABSTRACT
Two new Colombian species of the genus Vima Hirst, 1912 are described: Vima dilectus sp. nov. from the Meta department, and Vima bellator sp. nov. from the Santander department. Both species are consistent with the current diagnosis of Vima. Consequently, the genus distribution is expanded northwards. An updated distribution map and an identification key to the Vima species are provided.
Keywords
Diversity, Laniatores, Leiosteninae, taxonomy.RESUMEN
Se describen dos nuevas especies colombianas del género Vima Hirst, 1912: Vima dilectus sp. nov. del departamento del Meta y Vima bellator sp. nov. del departamento de Santander. Ambas especies se ajustan perfectamente a la diagnosis actual de Vima, por lo que la distribución del género es expandida hacia el norte. Se proporciona un mapa de distribución y una clave de identificación de las especies de Vima.
Palabras clave
Diversidad, Laniatores, Leiosteninae, taxonomía.INTRODUCTION
In the early lineages of Gonyleptoidea there exist an undesignated grade (paraphylum), characterized by the absence of a well-defined flat ventral plate and expanded subdistal portion of the penis (Kury 2014, Kury and Villarreal 2015, Villarreal et al. 2022). This group has been referred to as "hammer-bearing Gonyleptoidea" by Villarreal and García (2021). At least four harvestmen families are included in the malleus-bearing Gonyleptoidea group: Agoristenidae, Cryptogeobiidae, Gerdesiidae, and Stygnidae. Among these, only Agoristenidae and Stygnidae encompass species found in Colombia.
Agoristenidae Šilhavý, 1973, comprises 26 genera and 79 species of harvestmen primarily distributed within the Neotropical region (García and Villarreal 2023; García et al. 2022). The most speciose subfamily, Leiosteninae (12 gen. and 61 spp.), occurs in northern South America, exhibiting notable diversity within the Amazon region and the Andes of Venezuela and Colombia (García et al. 2022).
Similar to other families of Neotropical harvestmen, generic diagnoses within Agoristenidae have traditionally been established using the Roewerian taxonomic system. This approach has resulted in the inclusion of unrelated species within inadequately defined genera based on minor characteristics (Villarreal et al. 2015, Villarreal et al. 2023). Efforts have been initiated to address this issue, including the development of a Leiosteninae phylogeny (Kury 1997, Villarreal and García 2021, García and Villarreal 2023). Nevertheless, determining the precise generic placement of numerous species remains a challenge.
In Colombia, the Leiosteninae subfamily is represented by eight genera and 15 species. Vima Hirst, 1912, was described to accommodate V. insignis Hirst, 1912 from Guyana (Hirst, 1912). Subsequently, Vima was expanded and re-diagnosed to incorporate a second species from Colombia, V. panita García and Kury, 2020, from the department of Caquetá (García and Kury 2020).
Recent examination of specimens from two Colombian natural history collections, we identified two undescribed species of Vima from the Meta and Santander departments. In this paper, we describe and illustrate two new species from the Colombian departments of Meta and Santander. Additionally, we provide a species distribution map and offer a taxonomic key for the identification of all Vima species.
MATERIALS AND METHODS
The photographs were taken with a Leica M205C stereoscope attached to a Leica DFC450 digital camera and posteriorly edited in Photoshop CC 2014 software afterwards. Coloration descriptions use the standardized names (transcribed verbatim) and their numbers of the 267 Color Centroids of the NBS/IBCC Color System (Jaffer c2001). Drawings of external morphology and penis were made with the aid of a camera lucida and vectorized in Inkscape (Harrington et al., c2004). The collection data were transcribed verbatim from the labels, and additional interpolated information (e.g., specific locality, geographic coordinates) were estimated with Google Maps and are placed between square brackets.
Terminology for the dorsal scutum shape and the descriptions follows Villarreal and García (2021), and for the male genitalia macrosetae follows Kury and Villarreal (2015). Abbreviations: CL (carapace length), CW (maximum carapace width), DP (dorsal process), DS (dorsal scutum), DSL (dorsal scutum length), DSW (maximum dorsal scutum width), Fe (femur), LP (lamina parva), MS (macrosetae of penis), Mt (metatarsus), Pa (patella), Ta (tarsus), Ti (tibia). All measurements are in millimeters.
The examined material is deposited at ICN (Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá, Colombia), and MPUJ (Museo Javeriano de Historia Natural "Lorenzo Uribe S.J.", Pontificia Universidad Javeriana, Bogotá, Colombia).
This article has been recorded in the Official Registry of Zoological Nomenclature (Zoobank) as urn:lsid:zoobank.org:pub:BA7E4318-46F0-4AE2-BC40-8621BA4D4964.
RESULTS
Vima Hirst, 1912
Included species. Vima bellator sp. nov.; Vima dilectus sp. nov.; Vima insignis Hirst, 1912 (type-species); Vima panita García and Kury, 2020.
Diagnosis. See García and Kury (2020).
Distribution. Colombia: departments of Caquetá, Meta, and Santander. Guyana: Potaro-Siparuni region (Fig. 5).
Vima dilectus sp. nov. García and Villarreal
urn:lsid:zoobank.org:act:855A1899-DEBF-4531-A8F3-B52ADA46AFB9
HOLOTYPE. COLOMBIA. Meta: male, Acacías, vereda La Esmeralda, centro agroturístico Araguaney Corveica, colecta manual en bosque en tronco en descomposición, [3°57'06.1"N 73°42'00.7"W], alt. 514 m, 20 abr 2004, E. Flórez y Estudiantes Sistemática Animal (I-04), ICN-Ao-411.1 (ICN).
PARATYPE. COLOMBIA. Meta: one male, Acacías, same data as holotype, ICN-Ao-411 (ICN).
Diagnosis. Pedipalpal femur (distally), tibia and patella whitish (shared with V. panita; all segments concolor in V. bellator sp. nov. and V. insignis). Large dorso-distal tubercle dorsally projected on coxa IV (small in the other species). High ocularium (shared with V. panita and V. insignis; low in V. bellator). Connective tissue between DP and stylus with irregular peaks in all its extension (shared with V. bellator; just one medial peak in V. panita; tissue absent in V. insignis).
DESCRIPTION
Measurements. See table 1.
Dorsum. DS outline epsilon, type 2. Ocularium elliptical and medium, without median depression, tuberculated, located medially on the carapace. Mesotergum (abdominal scutum) delimited, divided into four areas, each one with a pair of paramedial large granules (Figs 1b, d, e, 2a-b). DS widest at level of area II. Area I divided into two halves with some granules; areas II--IV undivided and with some granules (Figs 1b, 2a-b). Posterior border of scutum curved (Figs 1a-b). Free tergites I--III with a row of granules (Figs 1b, d, 2a-b).
Venter. Stigmatic area with a few granules and a posterior row of conspicuous granules. Stigmata oval and concave (Fig. 1c). Coxa I with a curved row of tubercles increasing in size distally, and one proximal, large, and trapezoidal tubercle on the anterior margin of the coxa I, with a medium-sized tubercle at its base, and one small tubercle at the proximal face (Fig. 2c); coxa II longer than coxa I; coxa III longer than I and II; coxa IV backward (Fig. 1c).
Chelicera. Basichelicerite (segment I) trapezoid with well-marked bulla (Figs 1b, d); three large tubercles on ectal face, two large tubercles on posterior margin, and two medium-sized tubercles on the dorsomedial face (Figs 1b, d, 2a). Chelicera swollen (Figs 1, 2a, d). Anterior region of the hand with setiferous tubercles of different sizes that go from the medial region of the hand to the base of movable and fixed fingers. Fixed finger with the inner surface finely grooved. Movable finger with one trapezoid sub-basal tooth and the inner surface of the distal portion dentated (Fig. 2d).
Pedipalps. Trochanter with one ventral subapical tubercle. Femur with a ventroectal row of four setiferous tubercles, the two basalmost larger than the two distalmost, and one medium ventromesal setiferous tubercle in the apical portion (Figs 1c, 2e). Patella with one large mesal setiferous tubercle. Tibia ectal iIIi, mesal IIi. Tarsus ectal IIi, mesal IIi (Fig. 2e).
Legs. Leg I filiform, legs I--IV straight and smooth. Leg IV thicker than the others; coxa IV with a large dorso-distal tubercle dorsally projected (Figs 1a, d-e, 2b); Fe IV length almost three and a half times DS length (Fig. 1a). Tarsus IV without tarsal process, claws smooth. Tarsal counts: 7(3)-8(3)/15(3)-?/7-7/8-? (holotype), 7(3)-7(3)/15(3)-?/7-7/6-6 (paratype).
Penis. LP small (width twice the height) and apically depressed with anterolateral blunt and not dorsoapically pointed swollen tips (Figs 2f, g). Malleus with two pairs of branched MS-A located in the dorsal half, MS-A2 located far from the base of the stylus; one pair of branched MS-B on the ventral side; MS-C absent; two pairs of medium-sized MS-D1--D2 located close to each other and near the stylus on a keel between the dorsal region of the LP and the base of the stylus; MS-E2 large and branched, MS-E1 medium-sized, conical, and located slightly distal to MS-E2 on the ventral side of the LP (Figs 2f, g). Stylus elongated, mostly straight, and surpassing the LP; connective tissue present between the sharp DP and the stylus, slightly corrugated, with irregular peaks on the apical medial region (Figs 2f, g).
Color (in alcohol). Background of DS, chelicerae, and mesotergal paired granules Moderate Yellow (87). Lateral borders of DS, free tergites, and mesotergal areas around the paired granules Dark Grayish Brown (62). Pedipalpal segments of different colors: trochanter, the first half of the femur, dorsal spot of the tibia, tarsus, and claw Dark Grayish Brown (62); distal half of femur, patella, and tibia Pale Yellow (89). Legs I--IV Dark Grayish Brown (62) (Fig. 1).
Female. Unknown.
Distribution and habitat. The species is only known from the forests of the lowlands of Meta department (Acacías municipality) (Fig. 5), in the limits between the Cordillera Oriental montane forests and the ecoregion of the Apure-Villavicencio dry forests (Olson et al. 2001).
Etymology. The species is named after the late entomologist German Amat García, for his great teaching contribution to Colombian entomology. Amat is the Catalan version of the Latin surname Amatus, meaning the loved one. Dilectus, in Latin, has the same meaning.
Vima bellator sp. nov.
urn:lsid:zoobank.org:act:BDD0CC6B-226A-40B6-ABC7-44ED24BDDA61
HOLOTYPE. COLOMBIA. Santander: male, Puerto Parra, [Corregimiento] Campo Capote, en [planta de] borojó, [6°37'09.3"N 73°55'05.9"W], Mar. 2008, Sistemática Animal, ICN-Ao-575 (ICN).
PARATYPES COLOMBIA. Santander: one female, [Cimitarra], [Corregimiento] Puerto Araujo, hacienda Los Manantiales, [6°30'58.8"N 74°06'03.4"W], alt. 130 m, 9 abr 2000, A. Thielp et al., MPUJ_ENT0064490 (MPUJ); one female and one male, Vélez [Cimitarra], [Corregimiento] Puerto Araujo, pitfall, alt. 300 m, 2 apr. 2000, no collector, MPUJ_ENT0064488 (MPUJ).
DESCRIPTION
Measurements. See table 1.
Tabla 1: Measurements (in mm) of body and appendages of Vima dilectus sp. nov. and Vima bellator sp. nov.
Figura 1: Photographs of the habitus of Vima dilectus sp. nov. (ICN-Ao-411.1), male holotype: a. panoramic, b. dorsal, c. ventral, d. lateral, e. frontal. Scale bars: a = 3 mm, b, c, e = 1 mm, d = 0.5 mm.
Diagnosis. Segments of pedipalp concolor (as in V. insignis; in V. panita and V. dilectus the distal femur, patella, and tibia are whitish). Anteroproximal tubercle of coxa I with three marked peaks (smooth in the rest of the species). Low ocularium (high in the rest of the species). Peaks on the connective tissue between DP and stylus higher at medial region (same height in V. bellator; mostly smooth and with just one medial peak in V. panita; tissue absent in V. insignis).
Dorsum. DS outline epsilon, type 2. Ocularium medium, located medially on the carapace, without median depression and smooth. Mesotergum delimited and divided into four areas each one with a pair of paramedial low granules (Figs 3b, d, e, 4a-b). DS widest at level of area II. Area I divided into two halves, ornate with some granules; areas II--IV undivided and with some granules (Figs 3b, 4a-b). Posterior border of scutum convex (Figs 3b, 4a). Free tergites I--III with a row of granules (Figs 3b, d, 4a-b).
Venter. Stigmatic area with few granules. Stigmata oval and transverse (Fig. 3c). Coxa I with a sigmoidal row of tubercles increasing in size distally, one proximal, large, tricapitated tubercle on the anterior margin, and one medium-sized tubercle on the posterodistal region (Fig. 4c); coxa II longer than coxa I; coxa III slightly longer than I and II; coxa IV backward (Fig. 3c).
Chelicera. Basichelicerite trapezoid, with well-marked bulla (Figs 3b, d); two large tubercles on the ectal face, three large tubercles on the posterior margin, and some medium-sized tubercles on the dorsomedial face (Figs 3b, d, 4a). Chelicera swollen (Figs 3, 4a). Anterior region of the hand with small setiferous tubercles on the medial region, and a group of medium-sized/large tubercles close to the base of the movable and fixed fingers. Fixed finger with the inner surface finely grooved. Movable finger with one trapezoid sub-basal tooth, and with the inner surface on the distal portion dentated (Fig. 4d).
Figura 2: Drawings of Vima dilectus sp. nov. Male holotype (ICN-Ao-411.1): a. Habitus in dorsal view, b. same, lateral view; c. coxa I, ventral view; d. chelicera, frontal view; e. left pedipalp, mesal view. Genitalia of male paratype (ICN-Ao-411): f. lateral view, g. dorsal view (the letters A-D refers to the chaetotaxy system of Kury and Villarreal (2015)). Scale bars: a = 1 mm, b-e = 0.5 mm, f, g = 0.1 mm.
Figura 3: Photographs of the habitus of Vima bellator sp. nov. (ICN-Ao-575), male holotype: a. panoramic, b. dorsal, c. ventral, d. lateral, e. frontal. Scale bars: a = 3 mm, b, d = 1 mm, c, e = 0.5 mm.
Pedipalps. Trochanter with one ventral, subapical, and medium-sized tubercle. Femur with a ventroectal row of four setiferous tubercles, the two basalmost larger than the two distalmost, and one medium-sized ventromesal setiferous tubercle on the distal portion (Figs 3c, d, 4e). Patella with one large, mesal, setiferous tubercle. Tibia ectal iIIi, mesal IIi. Tarsus ectal IIi, mesal IIi (Fig. 4e).
Legs. Leg I filiform, legs I--IV straight and smooth. Leg IV thicker than the others; coxa IV with one small dorso-distal tubercle dorsally projected (Fig. 3a); Fe IV length almost four times DS length (Fig. 3a). Tarsus IV without tarsal process, claws smooth. Tarsal formula of holotype: 7-7/?-15/7-7/7-7.
Penis. LP small (width twice the height) and apically depressed, with an anterolateral blunt and not swollen tips dorsoapically pointed, and with a wide distal cleft (Figs 4f, g). Malleus with two pairs of branched MS-A located almost dorsally. MS-A2 located far from the base of the stylus; one pair of branched MS-B; MS-C absent; two pairs of medium-sized MS-D close to each other and near to the stylus. MS-D1--D2 located on a keel between the dorsal region of the LP and the base of the stylus; MS-E2 large and branched, MS-E1 medium-sized, conical, and located slightly distal to MS-E2 on the ventral side of the LP (Figs 4f, g). Stylus elongated, mostly straight, and surpassing the LP; connective tissue present between the sharp dorsal process and the stylus, slightly corrugated, with irregular peaks on the apical medial region (Figs 4f, g).
Figura 4: Drawings of Vima bellator sp. nov. Male holotype (ICN-Ao-575): a. Habitus in dorsal view, b. same, lateral view; c. coxa I, ventral view; d. chelicera, frontal view; e. right pedipalp, mesal view. Genitalia of male paratype (MPUJ_ENT 0064488): f. lateral view, g. ventral view (the letters A-D refers to the chaetotaxy system of Kury and Villarreal (2015)). Scale bars: a = 1 mm, b-e = 0.5 mm, f, g = 0.1 mm.
Color (in alcohol). Background of DS and chelicerae Moderate Yellow (87). Lateral borders of DS and free tergites Dark Grayish Brown (62). Mesotergal areas Moderate Brown (58) with transverse bands Moderate Yellow (87), pedipalps, and legs I-IV Moderate Brown (58) (Fig. 3).
Sexual dimorphism: Female with not hypertelic chelicera.
Distribution and habitat. The species is known from the forests of the lowlands of Santander department (Cimitarra and Puerto Parra municipalities) (Fig. 5) situated in the ecoregion of the Magdalena Valley montane forests (Olson et al. 2001).
Etymology. This species is named after the Colombian entomologist German Amat García. The name German, the Slavic form of Herman, is a masculine given name from an ancient Germanic name formed by harja (army) and mann (man), meaning warrior. Bellator, in Latin, has the same meaning.
Key to the species of Vima Hirst, 1912 (males)
1a Mesotergal areas II-III armed with a dorsal yellowish hump (García and Kury, 2020: fig. 2), penis stylus without connective tissue between the dorsal process and the stylus (García and Kury, 2020: fig. 4) ....................................... Vima insignis
1b Mesotergal areas unarmed (without dorsal yellowish hump), penis stylus with connective tissue between the dorsal process and the stylus (Fig. 2f) ................................. 2
2a All pedipalpal segments with the same coloration, brown in reticulated pattern; anteroproximal tubercle of coxa I with apical peaks on its surface (Fig. 4c) Vima bellator sp. nov.
2b Pa and Ti of pedipalpus with different coloration than the other segments, lighter; anteroproximal tubercle of coxa I with smooth surface (Fig. 2c; García and Kury 2020: figs 3g, 6c)... 3
Figura 5: Map showing the distribution of the species of Vima in northern South America.
3a Distal Fe of pedipalpus yellowish or whitish; mesotergal areas I-IV discolor (medial region yellowish) (Fig. 1b), LP of the penis with distal cleft (Fig. 2g) Vima dilectus sp. nov.
3b All Fe of pedipalpus brown; mesotergal areas I-IV concolor (uniformly brown) (García and Kury, 2020: fig. 5); LP of the penis without distal cleft (García and Kury 2020: fig. 7) Vima panita
DISCUSSION
When describing Vima panita, the second known species of the genus, García and Kury (2020) noted the presence of a dorsal process of the stylus connected by a dorsal keel. This is a condition shared with the genera Barinas González-Sponga, 1987 and some species of Avima Roewer, 1949 (e.g., A. wuayuunaiki García, González & Gutiérrez, 2022). García and Ahumada-C. (2022) proposed the generic synonym between Barinas and Vimina, referring to the dorsal keel present in Barinas virginis (González-Sponga, 1987) as a "connective tissue". Subsequently, García and Ahumada-C. (2022) described the species Barinas guanenta García and Ahumada-C., 2022, which lacks the mentioned connective tissue but possesses a dorsal process. In Vima, all the species exhibit a dorsal process in the stylus, with most (except the type species V. insignis) also having the connective tissue. Furthermore, the tip of the stylus in Vima is thick and curved towards the dorsal part, resembling the condition observed in species of Barinas, albeit with a more abrupt curvature. While the presence of the connective tissue may be homoplastic in Vima and Barinas ( Villarreal and García 2021), an alternative hypothesis (García and Villarreal, 2023) suggests a closer relationship between them and challenges the monophyly of Vima. According to this latter hypothesis, the presence of the connective tissue is a derived trait shared by species of a larger clade encompassing Barinas, Vima and Avima tuttifrutti García and Pastrana, 2021, despite the latter lacking it. Furthermore, it appears that four species in Avima, namely A. flavomaculata (González-Sponga, 1987), A. granulosa (González-Sponga, 1998), A. chiguaraensis (González-Sponga, 1987), and A. wayuunaiki, exhibit a similar morphology of the stylus, although only simplified schematic drawings of their genitalia are available for some of them. To re-diagnose Vima and establish a phylogenetic hypothesis of Leiosteninae genera, a comprehensive analysis of all known species of Barinas and Vima, as well as a case-by-case review of the species of Avima is imperative.
In the context of neotropical harvestmen, numerous genera exhibit species concentrations in one or few biogeographical areas, contiguous or not, for example, Ocoita González-Sponga, 1987, Oligovonones Caporiacco, 1951, Neocynorta Roewer, 1915, Rhaucoides Roewer, 1912, Stygnoplus Simon, 1879 (González-Sponga 2002, Medrano et al. 2019, Villarreal et al. 2021a, b, Medrano et al. 2022). Notably, the genus Vima also exhibits an intriguing disjunct distribution: V. insignis and V. panita have records in Guyana and the Colombian Andean-Amazonian foothill region, despite being separated by 1,500 km (García and Kury 2020: fig. 8; Fig. 5). According to the Köppen-Geiger climate classification (Köppen 1884; Beck et al. 2018), this region corresponds to a wide area of Tropical rainforest climate (Af), characterized as equatorial, fully humid with minimal fluctuation in both temperature and moisture levels (McKnight and Hess 2000).
In contrast, the two species described here are geographically close to each other (Fig. 5) but distributed in a different region (highlighted in light green in García and Kury 2020: fig. 8) characterized by a Tropical monsoon climate (Am). This climate type is known for its windy seasons and lower precipitation rates compared to Af, resulting in drier months (McKnight and Hess 2000). Nevertheless, the genus appears to be associated with lowlands (none exceeding 700 m), where constant precipitation rates and warm temperatures prevail. This suggests the possibility of finding Vima species in neighboring countries with similar climatic conditions, such as Brazil and Venezuela. This could potentially help address the current Wallacean shortfalls.
ACKNOWLEDGMENTS
We are thankful to Eduardo Flórez (ICN) and Dimitri Forero (MPUJ) who loaned the material here examined. Adriano Kury (UFRJ) provided all the laboratory facilities in the National Museum in Rio de Janeiro, Brazil. We thank the editor and one anonymous referee for the suggestions that greatly improved this work. This study has been supported by Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro - FAPERJ (#E-26/204.248/2021), and a scholarship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -- CAPES to AFG.
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