Carlos Viquez - Academia.edu (original) (raw)

Papers by Carlos Viquez

The type species of Costarina, C. plena (O. P.-Cambridge), is widely distributed, occurring from ... more The type species of Costarina, C. plena (O. P.-Cambridge), is widely distributed, occurring from southern Mexico to southern Costa Rica, but Costa Rica also houses an extraordinarily large fauna of endemic, less widely distributed Costarina species. In addition to the two previously described species, C. meridina (Chickering, the female of which is newly described) and C. watina (Chickering), 49 new endemic species are described: C. paraplena,

American Museum Novitates, Jan 6, 2014

Zenodo (CERN European Organization for Nuclear Research), Dec 31, 2012

ABSTRACT Two new species of the spider genus Enna O. Pickard-Cambridge, 1897 from Costa Rica and ... more ABSTRACT Two new species of the spider genus Enna O. Pickard-Cambridge, 1897 from Costa Rica and Peru are described and illustrated: Enna osaensis sp. nov. (female, Costa Rica) and E. moyobamba sp. nov. (female, Peru). The male of E. chickeringi Silva, Lise & Carico, 2008, from Costa Rica, is described and illustrated for the first time. Enna huarinilla Silva, Lise & Carico, 2008 is a junior synonym of Enna caliensis Silva, Lise & Carico, 2008. Enna baeza Silva, Lise & Carico, 2008, E. bonaldoi Silva, Lise & Carico, 2008, E. igarape Silva, Lise & Carico, 2008 and E. trivittata Silva & Lise, 2009 are newly recorded from Peru. Paradossenus junin Carico & Silva, 2010 is transferred to Enna O. Pickard-Cambridge, 1897. Trechalea boliviensis Carico, 1993 and Trechalea lomalinda Carico, 1993 are transferred to Syntrechalea F.O.P.-Cambridge, 1902. New records of Syntrechalea lomalinda comb. nov. are reported to Venezuela and Brazil.

Revista ibérica de aracnología, 2001

Zenodo (CERN European Organization for Nuclear Research), Oct 8, 2022

Euscorpius is the first research publication completely devoted to scorpions (Arachnida: Scorpion... more Euscorpius is the first research publication completely devoted to scorpions (Arachnida: Scorpiones). Euscorpius takes advantage of the rapidly evolving medium of quick online publication, at the same time maintaining high research standards for the burgeoning field of scorpion science (scorpiology). Euscorpius is an expedient and viable medium for the publication of serious papers in scorpiology, including (but not limited to): systematics, evolution, ecology, biogeography, and general biology of scorpions. Review papers, descriptions of new taxa, faunistic surveys, lists of museum collections, and book reviews are welcome. Derivatio Nominis The name Euscorpius Thorell, 1876 refers to the most common genus of scorpions in the Mediterranean region and southern Europe (family Euscorpiidae).

Systematic and Applied Acarology, 2015

The subgenusTityus (Archaeotityus)includes small variegated species considered until recently, a ... more The subgenusTityus (Archaeotityus)includes small variegated species considered until recently, a basal group withinTityus, one of the most diverse and medically relevant genera of scorpions in the New World.Archaeotityusspecies are distributed in the humid forests of Lower Central America and the Choco, Guiana Shield, and Amazon regions. Due to their size and habits,Archaeotityusspecies are not usually considered dangerous, however, there are some clinical reports that show otherwise. To contribute to the toxinological knowledge of these poorly explored species, we characterized the venom ofTityus ocelotefrom three localities in Costa Rica. In addition, we assessed the evolutionary relationships of putative sodium channel modulating peptides found in this species with those reported for other members of the genus, through a maximum likelihood phylogenetic analysis based on their amino acid sequences. We observed the presence of homologs of previously identified NaTx from the species...

Journal of Arachnology, Dec 1, 2011

Although relatively rare among harvestmen in the superfamily Gonyleptoidea, paternal care has bee... more Although relatively rare among harvestmen in the superfamily Gonyleptoidea, paternal care has been observed in the families Manaosbiidae and Gonyleptidae, but not previously in the Cosmetidae. In this study, we describe multiple observations of egg guarding by adult males of an undescribed species of cosmetid harvestman from Volcan Cacao, Guanacaste Province, Costa Rica. Observations were made from 26-28 July 2010, during the wet season. In this species, males only guard eggs after dusk, leaving eggs unattended during the day. Based upon differences in color and size, males guarded eggs through several stages of development. When guarding, males contacted the first two pairs of legs with the eggs. Oviposition sites consisted of the undersides of leaves of small plants, with eggs closely packed together in a single layer covered by abundant, transparent mucus. The largest, darkest eggs were located near the distal tip of the leaf

Caribbean Journal of Science, Jun 1, 2013

Descriptions of defensive behaviors used by Neotropical harvestmen are rarely based upon direct o... more Descriptions of defensive behaviors used by Neotropical harvestmen are rarely based upon direct observations of encounters between individuals and syntopic predators. In this study, we investigated the defensive responses exhibited by five harvestman species from Costa Rica in interactions with ctenid spiders (Cupiennius spp.), whip spiders (Phrynus pseudoparvulus), onychophorans (Epiperipatus sp.), and centipedes (Scolopendra sp.). We also observed interactions between harvestmen and a non-predatory invertebrate, the millipede Nyssodesmus python. In 64 encounters, ctenid spiders consumed 11 harvestmen, including eight Prionostemma sp., two Cynorta marginalis, and one Eupoecilaema magnum. The most frequent defensive behavior exhibited by harvestmen was fleeing. Other behaviors included aggression (striking with leg II), bobbing, leg autotomy, lying flat, and thanatosis. Prionostemma exhibited the most variable responses, especially in the presence of ctenid spiders. In addition to the lab-based experiment, we report some field observations of arthropod predation upon harvestmen in Costa Rica. Predators include two species of ctenid spiders (Cupiennius spp.), scorpion (Centruroides limbatus), solifuge (Ammotrecha stolli), mantid (Liturgusa annulipes) and ants.

FIGURE 5. Mastigoproctus formidabilis. Male and female sintype. A – B, male pedipalp; A, female g... more FIGURE 5. Mastigoproctus formidabilis. Male and female sintype. A – B, male pedipalp; A, female genitalia, dorsal aspect (arrow shows the seminal receptacle); B, Mastigoproctus colombianus. C – D, male pedipalp; C, female genitalia, dorsal aspect (arrow shows the seminal receptacle); D.

Mastigoproctus ayalai sp. n. (Figs. 1 A–F, 2 A–F, 3 A–B, 4, Table 1) ... more Mastigoproctus ayalai sp. n. (Figs. 1 A–F, 2 A–F, 3 A–B, 4, Table 1) Type. Male holotype (MIZA), Quebrada Trapichote (400 m), La Mina, Pijiguaos (6 º 34 ' N – 66 º 45 ' W), estado Bolívar, Venezuela, June 1992, J. M. Ayala. Paratypes: One adult male (IES) and one immature female (INBio), 8 females, 6 males (CMGS), 1 female, 1 male (CJMA), same data as holotype. One female (INBio), Los Pijiguaos (6 º 34 ' N – 66 º 45 ' W), estado Bolívar, Venezuela, June 1991, M. Ayala L. Distribution. Bolivar state, Venezuela (Fig. 4). Etymology. This species is named in honor of J. M. Ayala L., collector of the type series. Diagnosis. Total length 40–50 mm; dark brown. Male: sternite II (genital plate) with a pair of anterolateral depressions; sternite III with a central, sub-triangular field, covered with short, strong bristles; III–IV undivided. Pedipalps: trochanter moderately granulose, the remainder smooth; tibia higher than wide, not forming a conspicuous angle with respect to its longitudinal axis; scarce reddish hairs on the fingers; small ommatoids, ovoid in shape. Female: seminal receptacle tubular, J-shaped and distally swollen, with basal duct forming an angle of 45 º with respect to the longitudinal axis of the opisthosoma. This species may be separated from M. formidabilis Hirst (Fig. 5), by having more attenuate male pedipalp, with tibia ventrally unarmed (in M. formidabilis the tibia has a large ventral tooth); also, female seminal receptacles are very short in M. formidabilis, resembling those of Valeriophonus nara (Valerio) from Costa Rica. The Colombian Mastigoproctus colombianus Mello-Leitão has shorter and digitiform seminal receptacles, as well as stouter, armed and densely punctate pedipalp (Fig. 5). Male holotype. Reddish brown in color, paler on leg I. Carapace with interocular triangle mostly rugose; the remaining part of the carapace is densely granulose; median eyes separated by 1.4 times one ocular diameter, and 1.0 m [...]

Chemoecology

The scent gland secretion of an undetermined species of Prionostemma from Costa Rica was analyzed... more The scent gland secretion of an undetermined species of Prionostemma from Costa Rica was analyzed by gas chromatography–mass spectrometry and shown to consist of medium-chain carboxylic acids (mainly octanoic acid) and a ß-hydroxy-carboxylic acid, eventually identified as myrmicacin (= (R)-3-hydroxydecanoic acid). While scent gland secretions in harvestmen have traditionally been considered to be products of de novo synthesis, we here provide evidence for the unusual case of sequestration-derived scent gland constituents: at least myrmicacin appears to be sequestered from leaf-cutter ants that constitute a part of the prey of the Prionostemma-species herein investigated. This is the first report on the scent gland chemistry of the sclerosomatid subfamily Gagrellinae as well as on a possible sequestration mechanism in harvestmen.

FIGURE 2. Mastigoproctus ayalai sp. n. Female paratype. A, carapace; B, opisthosoma, dorsal aspec... more FIGURE 2. Mastigoproctus ayalai sp. n. Female paratype. A, carapace; B, opisthosoma, dorsal aspect; C – D, pedipalp: C, dorsal aspect; D, ventral aspect; E, sternites II – III; F, pigidium, lateral aspect ..

FIGURE 3. Mastigoproctus ayalai sp. n. Genitalia. A, male, ventral aspect, B, female, dorsal aspe... more FIGURE 3. Mastigoproctus ayalai sp. n. Genitalia. A, male, ventral aspect, B, female, dorsal aspect (arrow shows the seminal receptacle).