Luis E. Acosta

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Luis verified their affiliation via an institutional email.

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• PhD - Professor
• Professor at National University of Córdoba

The troglomorphic harvestman Otilioleptes marcelae gen. nov., sp. nov. from the basaltic cave Doña Otilia, Payunia region, Mendoza Province, Argentina, is described. Its systematic affinities were studied through cladistic and Bayesian analyses that included representatives of Gonyleptoidea; it was determined to represent a new monotypic family, Ot...

This paper addresses the population genetic structure of the forest-dwelling gonyleptid Geraeocormobius sylvarum (Arachnida, Opiliones). Phylogeographic analyses using cytochrome oxidase subunit I (COI) were conducted on 186 individuals from 43 localities in Argentina and Paraguay, arranged into nine operational sectors and defined upon geographic...

The largely neglected Chilean harvestman Gonyleptes bicornis Gervais, 1849 (Opiliones, Gonyleptidae), hitherto considered a junior synonym of Sadocus asperatus (Gervais, 1847), is revalidated and reallocated in genus Parabalta Roewer, 1913. This species has been repeatedly confused in the early literature, due to the misleading mismatch between tex...

Two new species of the genus Acrographinotus (Opiliones, Laniatores, Gonyleptidae) are described from protected areas placed on sub-Andean ranges: Acrographinotus tariquiae sp. nov. from Tariquía National Reserve, southern Bolivia, and A. calilegua sp. nov. from Calilegua National Park, northwestern Argentina. They represent the southernmost repres...

An updated overview of the Argentinean harvestman fauna, comprising 101 species (99 named and two under study), reunited in three suborders and 11 families, is provided. The richest family, Gonyleptidae, is represented by eight subfamilies, whose record in Argentina is partially the result of systematic advances of the last decade. A commented chec...

Gonyleptes robustus Holmberg, 1876 (Opiliones, Gonyleptidae), hitherto under the synonymy of Acanthopachylus aculeatus (Kirby, 1819) is revalidated. It is recognized as the second species of genus Acanthopachylus Roewer, 1913, currently monotypic, giving the new combination Acanthopachylus robustus (Holmberg, 1876) comb. nov. The huge synonymy form...

The harvestmen family Gonyleptidae (Opiliones), the largest one in the Neotropics (Kury 2003), is astonishingly diverse in eastern South America. The species-rich genus Eusarcus Perty, 1833, is characteristic for this area. It is the second largest gonyleptid genus (Kury 2003; Hara & Pinto-da-Rocha 2010), with a long taxonomical history beginning i...

The long-neglected Chilean harvestman species Pachylus crassus (Roewer, 1943) (Gonyleptidae, Pachylinae) is redescribed and illustrated from the types and additional material. A lectotype is designated from the original syntype series. Until now P. crassus was only known from its brief original description. Moreover, its generic affiliation remaine...

In its first twenty years of existence Zootaxa has been widely utilized among researchers of Opiliones, mainly those coming from Latin American countries, principally Brazil. During 2003-2020, a total of 141 papers on Opiliones were published in Zootaxa (no papers were published on Opiliones in the first two years, 2001-2002). The journal has great...

El notable dimorfismo sexual característico de la familia Gonyleptidae (Opiliones), así como la existencia de morfotipos discretos en machos respecto del tamaño corporal y la armadura, han merecido diversos análisis por varios autores, utilizando morfometría lineal. En este trabajo se propone la aplicación de técnicas de morfometría geométrica para...

The nomenclatural history of the collared and white-lipped peccaries, two well-recognized taxonomic entities, has been confusing. From the 18th century to the beginning of the 20th century, several genera were created, most of them without an explicit designation of type species. Due to differing opinions as to whether the two species should be inc...

The Juan Fernández islands (Chile) are a volcanic archipelago, 670 km away from the continent. Arachnids still remain understudied in those islands. We report the first two records of Parabalta reedii (Butler, 1874) (Opiliones, Gonyleptidae) from the Robinson Crusoe Island. One specimen was collected near San Juan Bautista town (in 2011), while a p...

A new genus of Gonyleptidae Pachylinae, Qorimayus gen. nov., is described to place the high-altitude species originally named Parabalta alticola Ringuelet, endemic to Sierra de Famatina, western Argentina. While classical exomorphological features do not separate this new genus from Parabalta Roewer or Pachyloides Holmberg (to which the species was...

This chapter provides an account of botanists and zoologists that were local and foreing members of the Academia Nacional de Córdoba, with their most relevant contributions.

Who is going to describe our biodiversity?: the taxonomic impediment faced to the Nagoya Protocol and the current regulations. The entry in force of the Nagoya Protocol on access on genetic resources and benefit sharing has triggered, since 2014, national and provincial regulations in Argentina, which rule different activities, among them the colle...

La vigencia del Protocolo de Nagoya sobre acceso a los recursos genéticos y participación en los beneficios ha impulsado, desde 2014, normativas nacionales y provinciales en Argentina, que regulan diversas actividades, entre ellas la colecta y el traslado de especímenes con fines científicos. En esta nota analizamos las consecuencias negativas sobr...

The Convention on Biological Diversity (CBD) commits its 196 nation parties to conserve biological diversity, use its components sustainably, and share fairly and equitably the benefits from the utilization of genetic resources. The last of these objectives was further codified in the Convention's Nagoya Protocol (NP), which came into effect in 201...

The disjunct distribution of the harvestman Discocyrtus dilatatus (Opiliones, Gonyleptidae) is used as a case study to test the hypothesis of a trans-Chaco Pleistocene paleobridge during range expansion stages. This would have temporarily connected humid regions (‘Mesopotamia’ in northeastern Argentina, and the ‘Yungas’ in the northwest, NWA) in th...

AICc (‘corrected Akaike information criteria’) scores obtained in the tuning experiment run to determine the MaxEnt ‘best model’ parameters for Discocyrtus dilatatus. (DOCX)

Relative importance of the 10 bioclimatic (bc) variables used to model the distribution of Discocyrtus dilatatus. (DOCX)

Map of population membership from a Bayesian population analysis in Geneland. The different colors indicate the hypothetical populations (four in this case) inferred by the analyses. (DOCX)

Pairwise Kimura 2 parameters (K2P) distance between localities of Discocyrtus dilatatus. The highest values are highlighted. (XLS)

Genealogical relationships of haplotypes of Discocyrtus dilatatus. (A) Maximum likelihood (ML), (B) Maximum parsimony (MP), and (C) Bayesian Inference (BI). For each tree, nodes are given the corresponding statistical support value, if applicable (bootstrap over 50 for ML and MP, 1000 pseudoreplicates; posterior probability over 0.67 for BI). In (A...

Coordinates of effective records used to model Discocyrtus dilatatus (Maxent.csv file). (CSV)

This paper primarily aims to test a Pleistocene refuge-type scenario, as previously proposed for the gonyleptid Geraeocormobius sylvarum, a semi-deciduous forests dweller in subtropical Argentina, Brazil and Paraguay. Palaeodistributional models of this species were built using MaxEnt for two Last Glacial Maximum (LGM = 21,000 years ago) simulation...

In this paper, the potential distribution of the Mesopotamian harvestman Discocyrtus dilatatus Sørensen, 1884 is modeled, and the species’ bioclimatic profile is described. Models were built with the presence-only methods MAXENT and BIOCLIM, using 85 unique records (of which 49 are new) and 11 non-correlated bioclimatic variables as predictors. Bot...

This research was aimed to analyse the genetic diversity of Geraeocormobius sylvarum, a forest-dwelling Neotropical harvestman with a disjunct distribution, separated by approximately 630 km of semi-arid environments. The usefulness of a fragment of the cytochrome c oxidase subunit I (COI) mitochondrial gene as molecular marker was tested in 109 in...

History of the Zoology in the University of Córdoba: the early years (1872-1916). This paper offers a brief historical account of the initial stages of the zoological sciences at the University of Córdoba (Argentina), from the establishment of the Faculty of Exact, Physical and Natural Sciences in the XIXth century, up to the academic retirement of...

Harvestmen are a good taxon for biogeographic studies due to their low vagility and their dependence on environmental conditions which make most of them live in humid and shaded habitats. Current knowledge of the geographical distribution of Uruguayan opiliofauna suggests that no evident zoogeographic areas are present, mainly because of the appare...

The geographic range of the Neotropical harvestman Discocyrtus testudineus (Holmberg, 1876) (Gonyleptidae) is addressed by determining the species’ bioclimatic profile and modeling its potential distribution. Analysis was performed on a record set of 71 localities, including literature records and 34 new localities reported here. The bioclimatic pr...

The presence of Gryne orensis (Sørensen) (Opiliones: Cosmetidae) in a Yungas locality (northwestern Argentina) is reported for the first time, providing new evidence for the Mesopotamian-Yungas disjunct pattern. Combining a total of 19 new Mesopotamian records with previous, reliable citations from the literature, a dataset of 45 points was used to...

The environmental constraints determining the distribution of the harvestman Discocyrtus prospicuus in Argentina and Uruguay are addressed. Habitat observations across the entire range (Río de la Plata-Atlantic coast area; Córdoba sierras; northwestern Argentina) are provided. Previous published localities (verified for accuracy), new records and b...

New records of the spider Chibchea salta Huber 2000 (Araneae, Pholcidae) from northwestern Argentina are provided, and the potential range of this species is modeled. Two presence-only methods, Maxent and Bioclim, were run using 19 bioclimatic parameters at a resolution of 30 arc seconds. The climatic profile of C. salta is described, and the relat...

The chemical composition of the scent gland secretion of Pachylus paessleri Roewer 1913, a pachyline harvestman, was analysed by gas chromatography–mass spectrometry. The secretion is a six-component mixture of benzoquinones, with 2,3-dimethyl-1,4-benzoquinone and 2,3,5-trimethyl-1,4-benzoquinone being the main components (together amounting for L...

The male of Dubiaranea difficilis (Mello-Leitão 1944) is described and illustrated for the first time. New geographic records of this species are provided, and its potential distribution is modeled using MAXENT. The actual and potential distribution of Dubiaranea difficilis proved to be much larger than the hitherto known records. This species inha...

This paper provides the description of a new species in the genus Zabius Thorell (Scorpiones, Buthidae), Z. gaucho n. sp., from four localities in the State of Rio Grande do Sul, Brazil. It differs from Zabius fuscus (Thorell 1877) and Z. birabeni Mello-Leitao 1938 in details of the telson shape, the longitudinal carinae on mesosomal tergites II-VI...

The scorpion genus Vachoniochactas González-Sponga, 1978 is herein recorded for the first time from Colombia, and Vachoniochactas humboldti sp. nov. is described based on three females and 16 males collected at three localities in the Guyanese region of Colombia. The new species is characterized, among other features, by the presence of a ventromed...

The potential distribution of the harvestman Geraeocormobius sylvarum Holmberg 1887 (Opiliones, Gonyleptidae, Gonyleptinae) from Argentina, Brazil and Paraguay, is modeled using the presence-only, GIS-based method Bioclim. The model was run on 2.5 min resolution climate layers using 19 derived bioclimatic variables. The bioclimatic profile of the s...

Several new records of the harvestman Geraeocormobius sylvarum Holmberg (Opiliones, Gonyleptidae, Gonyleptinae) from the Argentinean provinces of Misiones, Corrientes, Chaco and Tucumán, and the Brazilian states of Paraná, Santa Catarina and Rio Grande do Sul are provided. Most known localities spread over the Paranense Biogeographic Province, whil...

Along its history, the International Code of Zoological Nomenclature has needed to adapt its rules to changing realities, without affecting the goals of universality and stability of names. In recent years, major challenges have been promoted by rapid developments in the fi eld of information technology and the use of Internet, which renewed the di...

Bothriurus coriaceus Pocock and B. keyserlingi Pocock are redescribed, and the latter is restored as a valid species (formerly under synonymy of B. coriaceus). Though these species were erroneously mentioned from Argentina and Brazil, they are restricted to Chile: B. coriaceus distributed from Coquimbo to Santiago (type locality Coquimbo), and B. k...

A new genus and a new species of Gonyleptidae (Pachylinae) from the Peruvian Andes, Marayniocus martensi, are described. The generic distinction is primarily based on the male genitalia, especially the ventral process of the stylus, which is fan-shaped and bears an acute ventral apophysis; such a structure has no parallel among other Andean pachyli...

The purpose of this application, under Article 75.5 of the Code, is to replace the holotype of the scorpion Cercophonius brachycentrus bivittatus Thorell, 1877 (currently Orobothriurus bivittatus) from Argentina by the designation of a neotype. The taxonomic identity of O. bivittatus was recently assessed through hemi- spermatophore morphology, a f...

A HISTORY OF THE PERIÓDICO ZOOLÓGICO AND THE FIRST SOCIEDAD ZOOLÓGICA ARGENTINA (1874-1881). — This paper presents a historical account of the origins and development of the very first Argentinean Zoological Society (Sociedad Zoológica Argentina, initially erected as an Entomological Society), and of its scientific journal, the Periódico Zoológico....

Several previous nomenclatural corrections are analyzed and the valid name determined for each case. These include (a) emendations and subsequent spellings: Brachistosternus weijenberghi (Thorell, 1877a) (Bothriuridae), Urophonius iheringi Pocock, 1893 (Bothriuridae), Lisposoma jose- hermana Lamoral, 1979 (Bothriuridae), Chactas raymondhansi Franck...

The long neglected scorpion species Orobothriurus bivittatus (Thorell) stat. n., comb. n. (Bothriuridae), formerly considered a subspecies of Urophonius brachycentrus (Thorell) and more recently placed under synonymy of the type species of Orobothriurus Maury, O. alticola (Pocock), is revalidated and redescribed on a male captured in the Sierra del...

A new species of scorpion from southern Brazil, Bothriurus pora, is described. The hemispermatophore of this species is unique within the genus, displaying a highly developed and extremely complex capsular region. External morphology and shape of the sperm packages show a close relationship with the Bothriurus bonariensis species-group.

An informative account (in Spanish) on scorpions of medical importance in Argentina (mainly Tityus trivittatus, with identification features).

Figura 10. Localidades donde se ha capturado Tityus trivittatus en Argentina, Paraguay y Uruguay (basado en Maury 1997, Acosta 1989, Murúa et al. 2004 y datos inéditos). Se indican algunas áreas escorpiogeográficas en Argentina (modificado de Acosta & Maury 1998): yungas (Yu), chaco (Ch), sierras centrales (S), área mesopotámica (Me), área misioner...

Urophonius somuncura n. sp. (Scorpiones, Bothriuridae) is described and illustrated. This species is presumably endemic to the higher plains of the Meseta de Somuncurá (province of Río Negro, Argentina), a basaltic plateau in northern Patagonia. Its nearest relatives are U. granulatus Pocock, from southern Patagonia, and U. tregualemuensis Cekalovi...

The purpose of this application, under Articles 23.9.3 and 81.2.3 of the Code, is to conserve the specific names Buthus vittatus Guérin Méneville, 1838 (currently Bothriurus vittatus), Bothriurus coriaceus Pocock, 1893 and B. keyserlingii Pocock, 1893 for three distinct species of scorpions from central Chile, South America (family bothriuridae). T...

A new species of Orobothriurus (Scorpiones: Bothriuridae) from Santuario Nacional Ampay, Apurímac, Perú. Rev. per. Ent. 43.- Orobothriurus ampay sp. n., from the Peruvian Andes, known only from the Podocarpus forest in the Santuario Nacional Ampay, Apurímac, at 3100-3580 m, is described herein. Differs from other species of the alticola group - sub...

This paper provides new data and an updated interpretation of the distribution patterns of Argentinian harvestmen, discussing and correcting the validity of previously accepted opiliological areas. Arguments supporting the division of the central-northeastern sector into five areas (Mesopotamic, Pampasic, Chacoan, Central Sierras and Yungas) are pr...

Se presentan los primeros registros del escorpión sinántropo Tityus trivittatus (Buthidae) para las provincias de San Juan y La Rioja (Argentina), representando las localidades más occidentales de la especie. Los ejemplares se colectaron en ambientes urbanos o periurbanos. Se sugiere que este escorpión estaría en proceso continuado de expansión.

Two new Andean species of the genus Brachistosternus Pocock from southern Peru and northern Chile are described: B. titicaca sp. n. from the Titicaca basin (Departamento Puno, Peru), at 3850-3900 m, and B. quiscapata sp. n. from Departamento Tacna (Peru) and Provincia Arica (Chile), at 3100-3400 m. Both species belong to the subgenus Brachistostern...

Orobothriurus atiquipa new species (Scorpiones, Bothriuridae) from Lomas formations in the coastal desert of southern Perú is described and illustrated. This species belongs to the alticola species-group, and within the group, it is closely related to O. alticola (Pocock), O. paessleri (Kraepelin) and O. curvidigitus (Kraepelin). The spine formula...

Se describe la nueva especie Acrographinotus mitmaj (Opiliones, Gonyleptidae, Pachylinae). Ésta puede distinguirse fácilmente de otras especies en el género por el fémur IV del macho, largo y espinoso, sin las hileras de tubérculos y/o apófisis que caracterizan a los otros Acrographinotus; asimismo, A. mitmaj n. sp. presenta la apófisis mediana del...

Se presenta una lista actualizada de los escorpiones de Bolivia. Se mencionan 24 especies (tres de ellas con dudas) y una subespecie, pertenecientes a las familias Bothriuridae, Buthidae e Iuridae. Para cada especie se proporciona una referencia bibliográfica abreviada, así como la nómina completa de las localidades para las que ha sido citada. Bra...

The purpose of this application under Articles 23.9.3 and 81.2.3 of the Code is to conserve the well known specific name of Bothriurus alticola Pocock, 1899 for a scorpion (family BOTHRIURIDAE) from Argentina by giving it precedence over the little used subspecific name Cercophonius braehycentrus bivittatus Thorell, 1877. Pocock's nominal species i...

The diagnosis of the Andean genus Acrographinotus Holmgren is preliminarily revised, including both somatic and genital characters. The type species, Acrographinotus erectispina Roewer from the Bolivian "yungas" (montane rainforests), is redescribed and illustrated. All material previously cited as A, erectispzna was examined, and it was determined...

Two new species of the genus Orobothriurus Maury, 1976 (Bothriuridae) are described: O. famatina n. sp. from Sierra de Famatina, province of La Rioja, Argentina, and O. iskay n. sp. from inter-Andean valleys in southern Peru (Departamentos Apurímac and Cusco). Characters defining two species groups in Orobothriurus (pigment and trichobothrial patte...

The mating behaviour of the three closely related species, Bothriurus noa Maury, B. cordubensis Acosta and B. prospicuus Mello-Leitao, belonging to the prospicuus species-group, was studied. Ethological aspects of mating were analised to gather information, intended to improve the taxonomic and zoogeographic knowledge of the group. Patterns of sexu...

Orobothriurus wawita, new scorpion species from interandean valleys in SE Peru (2700-3800 m) is described. This species differs from congeners by its small size, as well as by the palp morphology of the male, remarkably more slender and devoid of the spine-shaped medial apophysis. Additionally, the ventral face of metasoma shows irregular pigmentat...

Females of several scorpion species are currently deemed to be sexual cannibals, but this reputation is, however, largely built on anecdotal evidence from the older literature. Theoretical models predict that given the low rates of female-male encounter, males should allow themselves to be cannibalized after sperm transfer. The present paper examin...

To contribute to a depuration of the species-level taxomomy in the Gonyleptidae Pachylinae, the following synonymies are proposed: Discocyrtus minutus Roewer 1913 = Discocyrtus testudineus (Holmberg 1876); Discocyrtus spinosus Roewer 1916 and Discocyrtus exceptionalis Mello-Leitao 1933 = Discocyrtus prospicuus (Holmberg 1876); Pachylus spinosus Can...

The nominal genus Bosqia Canals 1933 is determined to be junior subjective synonym of Pachyloides Holmberg 1878. This results in the new combination Pachyloides tucumanus (Canals 1933) for the only species hitherto assigned to Bosqia, and in a secondary homonymy with Pachyloides tucumanus Canals 1943. For the latter, the new name Pachyloides yungar...

The last stages of mating behaviour of six Argentinian scorpions from the family Bothriuridae are analysed: Bothriurus bonariensis (C.L. Koch), Bothriurus chacoensis Maury & Acosta, Bothriurus flavidus Kraepelin, Bothriurus noa Maury, Timogenes dorbignyi (Guérin-Méneville) and Urophonius jheringii Pocock. Comparisons are made with a buthid, Zahius...

Urophonius transandinus, new species belonging in the brachycentrus species-group is described. It can be separated from other species in the group by the pigmentation pattern of mesosoma and ventral side of metasoma, the number of pectinal teeth, and the arrangement of the ventral submedian keels of caudal segment I. Additionally, hemispermatophor...

The order Scorpiones is represented in Argentina by two families: the Gondwanian Bothriuridae are the most speciose and with wider range, whereas the cosmopolitan Buthidae are poorly represented in the country. A species checklist and an identification key for supraspecific entities are provided, to update those induded in earlier monographs and ch...

The Argentinean opiliofauna comprises about 115 species (among named and unnamed forms) of both suborders Palpatores and Laniatores. All nine families from Argentina are listed, three belonging in the Palpatores and six in the Laniatores, with a list of the hitherto valid genera and species in the country. Palpatores represent only 16 % of the spec...

A detailed redescription and illustrations of the scorpion Bothriurus cordubensis Acosta, a species found in the Sierras de Córdoba, San Luis, and La Rioja in Central Argentina, are given. The intraspecific variations of pigrnent patterns of prosorna, rnesosorna and ventral side of rnetasoma are analysed; comparisons with patterns of other species...

Bothriurus olaen, a new scorpion species from the Sierras de Cordoba and San Luis in Central Argentina, is described. It belongs to the burmeisteri species-group, and differs from the so far only named species in the group, B. burmeisteri Kraepelin, in bearing less developed lateroventral and submedian ventral keels on caudal segment V. Another spe...

The diagnosis and scope of the genus Pachyloides are emended, to comprise not only species with 7 tarsal segments in legs I11 and IV, but also those with 6 tarsomeres in those legs. As a result, three new combinations arise, all removed from Parabalta: Pachyloides sicarius, Pachyloides borellii and Pachyloides alticola. The genus Daguerreia is dete...

An updated catalogue of the type material of the Pachylinae species described by ROEWER is presented. A total of 111 species, included by ROEWER in the subfamily, as well as 3 species originally in Gonyleptinae, are listed in their original combinations (genus transfers and synonymies are pointed out). Informations on the labels, number and sex of...

This chapter gives updated check-lists of three groups of Arachnids in the province of Córdoba: Opiliones, Scorpiones and water mites. For the order Opiliones, 23 species (belonging to 5 families) are reported, while in the order Scorpiones there are 18 species (one of them in need of onfirmation), in 2 families; finally, 33 species of hydracarids,...

New localities for Argentinian scorpions (Arachnida, Scorpiones). New records of seven scorpion species from central-west Argentina are reported. The known ranges of Bothriurus noa Maury, B. prospicuus Mello-Leitao, Brachistosternus ferrugineus (Thorell), B.pentheri Mello-Leitao, Vachonia sp., Tityus confluens Borelli, and Zabius birabeni Mello-Lei...

A new record of Pachyloides sicarius (ROEWER, 1925) is reported from El Potrero, near Andalgalb, province of Catamarca, Argentina. The locality is about 380 km south to the nearest, so far known record of the species, in the province of Jujuy. It is hypotesized that this probable disjunct distributional pattern is the remaining of a once larger ran...

ABSTRACT. New records of Discocyrtus dilatatus Sörensen are reported from central and north-western Argentina, extending the known distribution of the species and the genus in more than 300 km westwards. Through the study of part of the type series and additional materials, the taxonomic knowledge of the species is updated, both on external and gen...

The results of scorpiofaunal surveys, carried out in eight westem chaco areas belonging to the Llanos district (Argentina), are given. Nine scorpion species have been recorded in the whole district. The specific composition in each site was quantified, and their similarities and differences are commented; additionally, a chaco area outside of the L...

This paper gives an updated summary on the diversity of the arder Scorpiones in the Argentinian part of the Western Chaco. A total of 11 species are registered, and they are clasified in three groups, according to their distributional patterns: typical chaco species (Timogenes elegans, Timogenes dorbignyi, Brachistosternus ferrugineus, Bothriurus c...

The Argentinian genus Pachyloidellus Müller, formerly regarded as junior synonym of Acanthopachylus Roewer, is hereby revalidated and revised.Sphaleropachylus Mello-Leitao is determined to be its junior synonym, from which two new combinations result: Pachyloidellus butleri (Thorell) (= Pachyloidellus fuscus Müller = Pachylus gouldii Weyenbergh = P...

The defensive secretions of the Argentinian harvestman Pachyloidellus goliath and their spreading mechanism are studied here. It is established that they consist of two fluids: a colourless one, originating from the mouth, and a yellow one, produced by the scent glands. The former is of an aqueous nature, and reaches the gland opening and the later...

Scorpions and opilions of the province of Córdoba (Argentina): diversity and zoogeography.- The province of Córdoba, in middle Argentina, comprises three main biogeographical areas: the "Chaco", the "Pampa" and the hilly region. The specific diversity of Scorpiones and Opiliones, as well as their distribution patterns were examined through extensiv...

This paper deals primarily with the poorly known harvestman Neopucroliella pertyi (Thorell) and a new species, Neopucroliella sanctiludovici. The taxonomic identity of the former isclarified and the species is redescribed. Neopucroliella borgmeieri (Mello-Leitlo) is determined to be a junior synonym of N. pertyi. Neopucroliella sanctiludovici n.sp....

Bothriurus chacoensis, a new species belonging to the bonariensis group, is described and illustrated. In comparison to the typical form, B. bonariensis (C.L. Koch), B. chacoensis is darker and smaller, and shows a lower number of pectinal teeth. The sharpest differences are in the hemispermatophore: (1) the frontal ridge extends from 57,5 to 62% o...