Oscar Francke

Oscar Francke
Universidad Nacional Autónoma de México | UNAM · Institute of Biology

Ph. D. Zoology

About

204
Publications
68,236
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2,176
Citations
Citations since 2016
55 Research Items
1122 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Additional affiliations
April 2004 - October 2015
Universidad Nacional Autónoma de México
Position
  • Full time Researcher

Publications

Publications (204)
Article
Whereas morphology remains a powerful tool for the diagnosis and description of short-tailed whip scorpions, or schizomids (Order Schizomida Petrunkevitch, 1945), especially when adults of both sexes are available, the systematics of some schizomid taxa is difficult to resolve due to a lack of characters in these morphologically conserved arachnids...
Article
Full-text available
Sistema Huautla is the deepest cave system in the Americas at 1560 m and the fifth longest in Mexico at 89,000 m, and it is a mostly vertical network of interconnected passages. The surface landscape is rugged, ranging from 3500 to 2500 masl, intersected by streams and deep gorges. There are numerous dolinas, from hundreds to tens of meters in widt...
Article
Among Opiliones (Arachnida), there are many taxa either with no familial assignment or erroneously located in their current family. This is the case of Ethobunus pilosus, formerly in Phalangodidae and before this work in Zalmoxidae. To assess the phylogenetic position of this taxon, we started with a revision of the male genitalia; followed by the...
Article
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The males of the Mexican species Megacormus gertschi Díaz-Najera, 1966 (Scorpiones: Euscorpiidae: Megacorminae) sting the female repeatedly in the pedipalp tibia-patella intersegmental membrane (TPIM) during the initiation of the promenade a deux. It has been suggested that the male’s venom introduced during this “sexual sting” behavior could gener...
Article
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In the present paper, we have made a taxonomic revision of the previously monotypic genus Troglostygnopsis Šilhavý, 1974. Based on the revision of diverse material, the genus is rediagnosed and the type species, Troglostygnopsis anophthalma Šilhavý, 1974 is redescribed. The new species Troglostygnopsis kalebi sp. nov. is described from specimens co...
Article
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Scorpion species often occur in sympatry, especially in tropical forests. Here, we analyse aspects of the intraguild interactions occurring between Centruroides limbatus (Pocock, 1898) and Tityus ocelote Francke & Stockwell, 1987 (Buthidae) in a tropical forest of Costa Rica. We divided the study in 2 areas: north and south. Results show difference...
Article
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Integrative taxonomy is relevant for the discovery and delimitation of cryptic species by incorporating different sources of evidence to construct rigorous species hypotheses. The genus Davus was recently revised and it was found that Davus pentaloris presents high morphological variation across its widespread distribution. However, tarantulas usua...
Article
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Three new species of the short-tailed whipscorpion genus Surazomus Reddell & Cokendolpher (Hubbardiidae Cook, 1899) are described from Mexico: Surazomus chiapasensis sp.n., from Chiapas, Surazomus escondido sp.n., and Surazomus peregrinus sp.n., both from Oaxaca. Surazomus was previously known primarily from South America, its northernmost record r...
Article
Until recently, the Nearctic short-tailed whipscorpion genus, StenochrusChamberlin, 1922, included 27 species distributed primarily in Mexico, the USA and Central America. Morphological disparity among its species, associated with their adaptation to diverse habitats, raised the question as to whether Stenochrus was monophyletic. The phylogenetic r...
Article
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Two new genera, Ampliphallus gen. nov. and Guelaguetzia gen. nov., are described from material collected in the state of Oaxaca, Mexico. The genus Ampliphallus gen. nov. is monotypic and contains the species A. chimalapaensis sp. nov., from the tropical rain forest of Santa María Chimalapa, Oaxaca. The genus Guelaguetzia gen. nov. is composed of tw...
Article
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The tarantula genus Brachypelma includes colourful species that are highly sought after in the commercial pet trade. They are all included in CITES appendix II. We present phylogenetic analyses using molecular and morphological characters to revise Brachypelma, in which we include all currently known species. Our results agree with a previous study...
Article
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From a biological point of view, caves are one of the most exciting environments on Earth, considered as evolutionary laborato- ries due to the adaptive traits (troglomorphisms) usually exhibited by the fauna that inhabit them. Among Opiliones, the family Stygnopsi- dae contains cave-inhabiting members who exhibit some degree of troglomorphic chara...
Article
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In this work, the holotype of Metaconomma femorale Pickard-Cambridge, 1905 was revised. As a result, the genus Metaconomma Pickard-Cambridge, 1905, a member of the infraorder Grassatores with uncertain family placement, is proposed as a junior synonym of Hoplobunus Banks, 1900 in Stygnopsidae, with the new combination Hoplobunus femoralis comb. nov...
Article
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Based on the recently published total evidence phylogeny of the family Stygnopsidae, the genus Paramitraceras Pickard-Cambridge, 1905 was recovered as polyphyletic. As part of the revision of this polyphyletic genus, the Neotropical genus Panzosus Roewer, 1949 stat. rev. is resurrected from its synonymy under Paramitraceras. Panzosus is rediagnosed...
Article
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The new species Huasteca kardia sp. nov. is described from material collected in the Huautla cave system, Oaxaca, Mexico. Based on recent literature on morphology and male genitalia, the diagnosis of the genus is amended and an identification key of the species of the genus is provided. Using Scanning Electron Microscopy (SEM), all Huasteca species...
Article
Genus and subgenus names introduced for all Recent and fossil scorpions from 1758–2018, are listed. The treatment follows the Conspectus of Francke (1985) and Dupré (2007) with considerable additional information accumulated during intensive scorpiological research of 2006–2018. The list also includes all available generic and subgeneric synonyms,...
Article
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Anicius Chamberlin, 1925 is a monotypic genus and only the male of A. dolius Chamberlin, 1925 has been described. Herein the genus is revised and the female of the type species is described for the first time; new distribution records are also provided for this species. Five new species from Mexico are described based on males and females: Anicius...
Article
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A new species of scorpion belonging to the genus Centruroides Marx, 1890 is described from the Coalcomán mountain range, western Michoacán State, Mexico. Its general aspect resembles Centruroidesruana Quijano-Ravell & Ponce-Saavedra, 2016, and C.infamatus (C. L. Koch, 1844), but it is a smaller species having lower pectinal tooth counts; also, male...
Article
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The type of Tityus macrurus is definitely a species of the genus Centruroides and is very closely related to the species occurring in coastal Veracruz described and identifie d by Hoffmann (1932) as C. gracilis. However, as pointed out by one of us (Wagner, 1977) , the name Centruroides gracilis is currently applied to a poorly understood complex o...
Chapter
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Twelve species of scorpions, belonging to three families and seven genera, have been recorded from the Cuatro Cienegas Basin (CCB). Two are considered endemic, but this might be due to poor sampling efforts in other areas of the state of Coahuila; the other ten species are widely distributed in the Chihuahuan Desert and are not threatened at the ti...
Article
Within the scorpion genus Vaejovis C.L. Koch, the “mexicanus” group is composed of species distributed in the mountains of México. This group presents taxonomic problems, because its characterization and the species included in the group have varied through the years. In the present work, we redefine this group based on several morphological charac...
Article
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Centruroides lauriadnae sp. n. is described from Sonora State, Mexico. This species belongs to the so called “striped” group in the genus (sensu Hoffmann, 1932). It is compared with the 2 other species recorded for Sonora: C. pallidiceps Pocock and C. sculpturatus Ewing, as well as compared with C. suffusus (Pocock) of northern México. © 2019 Unive...
Article
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Based on the examination of material and photographs of types of Isaeus and Tampiconus (Stygnopsidae), we rediagnose the genus and redescribe the species Isaeus neglectus comb. nov., including new distribution records. Additionally, we consider Tampiconus as a junior synonym of Isaeus, proposing the new combination Isaeus philippii comb. nov. Final...
Article
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Ortholasmatinae is one of the most striking groups of Opiliones, because its members exhibit a peculiar dorsal ornamentation pattern of cells, formed by fusion of anvil-shaped tubercles. During the systematic revision of several specimens of ortholasmatines, we found specimens with shared morphological characters with two genera Trilasma Goodnight...
Article
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Vaejovis islaserrano sp. n. is described from the Sierras Elenita and La Mariquita, Municipio de Cananea, Sonora, Mexico. This species belongs to the “vorhiesi” group of the genus Vaejovis and inhabits pine-oak forests in northern Mexico. This species is compared to its most similar species. This new species presents an interesting morphological di...
Article
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The suborder Mygalomorphae is generally poorly represented in the cave faunas of the world. The genus Hemirrhagus is endemic to Mexico and has 22 described species. It is the only one with epigean, troglophile and troglobitic species. Lack of urticating setae, loss of eye pigmentation and ocular reduction are interpreted as evolutionary reversals r...
Article
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Two new species of ricinuleids of the genusPseudocellusPlatnick, 1980 are described based on adult males andfemales from Mexico:Pseudocellus quetzalcoatlsp. nov. andPseudocellus olmecasp. nov. from the same type locality in thestate of Veracruz. The two new species represent the first record of two sympatric epigean species of ricinuleids for North...
Article
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The North American vinegaroon, Mastigoproctus giganteus (Lucas, 1835), is demonstrated to comprise a complex of range-restricted species rather than a single widespread polymorphic species. Seven species are recognized based on morphological characters of the adult males, including the arrangement of spines on the prodorsal margin of the pedipalp t...
Article
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The North American genus Stenochrus is represented by 22 species distributed mainly in Mexico, Central America and the U.S.A.; the genus was erected originally to place the species Stenochrus portoricensis and was characterized by the presence of lateral lobes reduced on female spermathecae, male flagellum without important dorsal relief, pedipalps...
Chapter
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Natural history collections are essential tools for development in biological research. Since the nineteenth century, arachnological collections in the Neotropics have been collaborating to carry out research on spiders and human resource training. In many cases, they have been the starting point of several research fields and the first steps allow...
Chapter
Full-text available
Natural history collections are essential tools for development in biological research. Since the nineteenth century, arachnological collections in the Neotropics have been collaborating to carry out research on spiders and human resource training. In many cases, they have been the starting point of several research fields and the first steps allow...
Article
Systematic relationships among Laniatores have received considerable attention during the past few years. Many significant taxonomic changes have been proposed, particularly in the superfamily Gonyleptoidea. As part of this superfamily, the basalmost Stygnopsidae is the least known family. In order to propose the first total evidence phylogeny of t...
Article
Full-text available
Systematics has been formally implemented for about 250 years. In the last decades it has suffered great intellectual change, with the embrace of phylogenetic theory and the availability of molecular information. Here we conduct a systematic revision of Bonnetina, a group of tarantulas endemic to Mexico. Species delimitation is mainly conducted fro...
Article
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Since its original description, the theraphosid spider genus Crassicrus Reichling and West, 1996 has not been revised and no new species have been described. While reviewing material deposited in the Mexican National Collection of Arachnids (National Autonomous University of Mexico, Mexico City) and the American Museum of Natural History (New York,...
Article
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The schizomid family Protoschizomidae, endemic to North America, is represented by two genera and 15 species. While most of the species are distributed in caves in the Sierra Madre Oriental system in Mexico; other species are found in caves in the Sierra Madre Occidental system. Recently, a new species of this family was described from a cave in th...
Article
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During the systematic revision of Mayazomus, the third most diverse genus of micro whip-scorpions in North America, we found three species with peculiar morphological variation, which are different from those diagnostic characters for Mayazomus. These species share with Mayazomus the large body size and the unusual development of the male pedipalps...
Article
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Mexican red-kneed tarantulas of the genus Brachypelma are regarded as some of the most desirable invertebrate pets, and although bred in captivity, they continue to be smuggled out of the wild in large numbers. Species are often difficult to identify based solely on morphology, therefore prompt and accurate identification is required for adequate p...
Article
Full-text available
Systematic relationships among Laniatores have received considerable attention during the past few years. Many significant taxonomic changes have been proposed, particularly in the superfamily Gonyleptoidea. As part of this superfamily, the basalmost Stygnopsidae is the least known family. In order to propose the first total evidence phylogeny of t...
Article
Full-text available
Se presenta la revisión taxonómica del género Krusa Goodnight y Goodnight, 1947, el cual actualmente incluye 6 especies endémicas de México. Debido a que K. annulata Goodnight y Goodnight, 1945; K. flava Goodnight y Goodnight, 1946; K. metallica Goodnight y Goodnight, 1946; K. stellata Goodnight y Goodnight, 1946 y K. tuberculata Goodnight y Goodni...
Article
Determining species boundaries is a central debate in biology. Several recently developed molecular delimitation methods have highlighted extensive inconsistency in classical morphological taxonomy. However, choosing between them is contentious. Molecular studies on theraphosid spiders have found considerable cryptic diversity and many species redu...
Poster
Full-text available
The state of the knowledge on the morphology of whipscorpions is basic and its study has been largely neglected (Rowland 1979, Ballesteros & Francke 2006). In an overview, there are few publications that deal in depth not only with this topic, but also in almost everything related to the order. Lucas (1835) originally described Thelyphonus giganteu...
Article
Schizomid female flagellum, including the number of “flagellomeres” and the setae, are among the most important taxonomic characters within the order. It is widely used to diagnose genera within both extant families. Despite the traditional use in schizomid taxonomy, the phylogenetic signal of these characters has been only once tested in the syste...
Article
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The family Protoschizomidae is currently known from 13 species and 2 genera found in Mexico. The present contribution describes 3 new species of Agastoschizomus, 2 from caves in Tamaulipas and Estado de México; the third one from a cave in Texas, USA. With this contribution, the genus Agastoschizomus attains the same richness as Protoschizomus (8 s...
Article
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Three new species of the genus Philora are described: Philora izel sp. nov., Philora mazateca sp. nov. and Philora nympha sp. nov. Two of these, P. izel and P. nympha exhibit remarkable troglomorphisms (adaptations to life in caves), such as depigmentation, absence of eyes and elongation of appendages. These conditions are discussed and their ocurr...
Article
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Three new species of the genus Chapulobunus Goodnight & Goodnight, 1946, are described: Chapulobunus asper sp. nov., Chapulobunus psilocybe sp. nov., and Chapulobunus regiomontano sp. nov. from the states of San Luís Potosí, Oaxaca, and Nuevo León, in Mexico, respectively. Additionally, an identification key to the five known species of the genus i...
Article
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Scorpions are among the oldest terrestrial arthropods, which are distributed worldwide, except for Antarctica and some Pacific islands. Scorpion envenomation represents a public health problem in several parts of the world. Mexico harbors the highest diversity of scorpions in the world, including some of the world’s medically important scorpion spe...
Article
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The schizomid genus MayazomusReddell & Cockendolpher, 1995, endemic to south-eastern Mexico, currently comprises seven species. It was originally proposed to accommodate two species, from Chiapas and Tabasco. Recently, five additional species from Chiapas were described. The monophyly of the genus has never been tested using cladistic analysis. We...
Article
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A cladistic analysis of the genus Karos Goodnight & Goodnight, 1944, was performed using morphological data of the somatic and male genitalia characters. The analysis included 23 terminal taxa, including nine of the 11 described species of the genus plus nine new species according to the previous generic diagnosis and five species as outgroups. Acc...
Article
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The genus Ixchela Huber is composed of 20 species distributed from northeastern Mexico to Central America, including the five new species described here from Mexico: Ixchela azteca sp. nov., Ixchela jalisco sp. nov., Ixchela mendozai sp. nov., Ixchela purepecha sp. nov. and Ixchela tlayuda sp. nov. We test the monophyly and investigate the phylogen...
Article
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A new species of scorpion is described based on a rare entire adult male preserved in a cloudy amber from Miocene rocks in the Chiapas Highlands, south of Mexico. The amber-bearing beds in Chiapas constitute a Conservation Lagerstätte with outstanding organic preservation inside plant resin. The new species is diagnosed as having putative character...