Sample records for sciuridae

  1. Rodentia: Sciuridae

    African Journals Online (AJOL)

    Close chromosomal congruence in two species of ground squirrel: Xerus inauris and X. princeps. (Rodentia: Sciuridae). T.J. Robinson, • .1.0. Skinner and A.S. Haim. Mammal Research Institute, University of Pretoria, Pretoria. Chromosomes from cultured fibroblasts of two southern. African ground squirrel species, Xerus ina ...

  2. Revisión de los Sciuridae del Aragoniense y del Rambliense en la fosa de Calatayud-Montalbán = Revision of Aragonian and Ramblian Sciuridae in the Calatayud-Montalban Trench

    NARCIS (Netherlands)

    Cuenca Bescós, G.


    The Sciuridae are the family of rodents that comprises all extant and fossil squirrels. In the Ramblian and especially in the Aragonian of the Tertiary basin of Calatayud-Montalbán (Aragón, Spain) the remains of Sciuridae are relatively abundant. A major problem solved in this paper is the

  3. Sciuridae, Rapoport’s effect and the mismatch between range size, conservation needs, and scientific productivity: an approach at the genus level

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    G. Amori


    Full Text Available Rapoport’s rule states that species at high latitudes have broader ranges than species at low latitudes. This rule has been strongly disputed over the years, and the majority of current scientists think that this is mostly a local phenomenon. However, if Rapoport’s rule applies, it should be a priori expected that taxa occurring in equatorial and tropical regions should be more threatened than those at temperate regions. In this paper, we test 1 whether Rapoport’s rule applies to Sciuridae genera (Mammalia, Rodentia and, if so, 2 whether the research efforts by scientists have been concentrated on those taxa that, because of their range size, may be predicted to be more threatened (i.e. equatorial and tropical taxa. Distribution data on Sciuridae came from literature and were transformed as maps according to World Map Program, and data about number of papers published by genus and by latitude were collected from the ISI Web of Knowledge. Our analysis verified the occurrence of a Rapoport’s effect in Sciuridae in both the hemispheres: mean range size increased significantly with latitude increases in both hemispheres. However, literature data inspection revealed that only a few genera accounted for the great majority of studies, and these genera were widely distributed and found at high latitudes. Thus, there is a potentially serious gap between current knowledge and threat expectations for Sciuridae worldwide. We therefore strongly urge scientists to give priority attention towards field studies of tropical Sciuridae genera.

  4. rodentia: sciuridae

    African Journals Online (AJOL)

    it is apparently not an efficient vector of plague. Sucking lice. The sucking louse, Neohoematopinw heliosciuri has been found on the African tree squinels. Heliosciurus rufobrachium. Funisciurus anerythrus and Paraxerus boehmi em;"i by Rahm (19~2). and. Ledger (1976) additionally records these lice from. Paraxerus ...


    African Journals Online (AJOL)

    DOBRORUKA, L J 1970. Behaviour in the bush squirrel, Paraxerus cepapi (A Smith, 1836). Revue Zoo I. Bot. afro 82: 131-141. GUNTER, G cl ELEUTERIUS, L 1971. Bark-eating by the common gray squirrel following a hurricane. Am. Midi. Nat. 85:23S. NIXON, C M 1970. Insects as food for juvenile gray squirrels. Am. Midi.

  6. Cytogenetic investigations in Sciurus anomalus from Turkish Thrace (Rodentia: Sciuridae)

    Czech Academy of Sciences Publication Activity Database

    Arslan, A.; Zima, Jan


    Roč. 64, č. 4 (2012), s. 421-426 ISSN 0324-0770 Institutional support: RVO:68081766 Keywords : karyotype * C-banding * Ag-NOR staining * Caucasian squirrel * Turkey Subject RIV: EG - Zoology Impact factor: 0.309, year: 2012

  7. Comportamentos e atividade diária de Sciurus ingrami (Thomas em cativeiro (Rodentia, Sciuridae Behaviour and diary activity of Sciurus ingrami (Thomas in captivity (Rodentia, Sciuridae

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    Marcelo Bordignon


    Full Text Available From October 1994 to November 1995 the behaviour, postures and diurnal activity of tive captive squirrels Sciurus ingrami were observed and registered. Four basics postures, five grooming behaviours, displacements and face wiping behaviour were identified. Based on behavioural observations, the diurnal activity was divided into four categories: resting, displacement, teeding and maintenance. The time spent in each category varied seasonally and the squirrels spent more time resting during winter and spring. However, more time was spent feeding during autum and summer and was reduced the displacement in autum. Two types of breeding behaviour were identified: sexual trailing and mating chase of females by males. However copulatori behaviour was not recorded during the studied period. We also verified that S. ingrami presents thermorregulation behaviour during winter, remaining resting in the nest to conserve energy in heath maintenance. During the hottest seasons, the squirrels remain resting out of the nest, placed on the branchs to decrease their body heat to normal temperature, The behaviours observed in this study were similar to those described in the literature, as well as the mating behaviour, which was very similar to S. carolinensis.

  8. ectoparasites of the bush cep.a.pi, in the transvaal (rodentia: sciuridae)

    African Journals Online (AJOL)

    plague in Mrica and in some places it is probably the main vector. An additional record of the flea,. Xenopsylla sp., was also recorded from Naboom- spruit (July). The cat flea, CtenocepluJlidesfelis, is widespread over Mrica on Canidae, Felidae, Viver- ridae, Hyaenidae and Leporidae as well as on domestic animals and ...

  9. Variación cariológica en diferentes fenotipos de Sciurus granatensis (Rodentia, Sciuridae

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    Marcos Nicolás Chacón Rojas


    de individuos con genomas diferentes en un población puede originar un proceso de depresión por exogamia o introgresión genética (pérdida de alelos adaptativos locales, procesos nocivos para la población receptora. Se estudiaron siete especímenes (cinco hembras y dos machos de S. granatensis procedentes del tráfico ilegal. Los cariotipos fueron obtenidos a partir de cultivos de linfocitos de sangre periférica. Las metafases con bandas G, R, C, Q y NOR, se analizaron al microscopio y se ordenaron en el programa Lucia Karyotyping®. Los individuos estudiados corresponden a los tres fenotipos reportados por Emmons LH, 1990, pero con una gran variación cariológica. Solo uno de los machos no corresponde a los fenotipos descritos, y además presenta varios rearreglos cromosómicos que lo diferencian notablemente de los demás, por lo cual posiblemente se trate de un híbrido estéril originado de dos poblaciones diferenciadas cariológicamente. El número de cromosomas fue constante (2n=42, con variación en el número fundamental (NF=80; 81, por lo cual se reportan tres cariomorfos para Sciurus granatensis, según NF y los rearreglos cromosómicos encontrados. Se observó variación en los pares 9, 16 y una translocación universal entre autosomas dentro de uno de los ejemplares. El cromosoma X es submetacéntrico mediano. El cromosoma Y es acrocéntrico, coincidente con lo descrito para Sciurus. No se registró una relación cariotipo-fenotipo. Por lo tanto se puede sugerir que Sciurus granatensis, es un complejo de especies con diferencias cariológicas y morfológicas que no ha sido estudiado a profundidad teniendo en cuenta su amplia distribución geográfica.

  10. Behaviour and diary activity of Sciurus ingrami (Thomas) in captivity (Rodentia, Sciuridae)


    Bordignon, Marcelo; Monteiro Filho, Emygdio L.A


    From October 1994 to November 1995 the behaviour, postures and diurnal activity of tive captive squirrels Sciurus ingrami were observed and registered. Four basics postures, five grooming behaviours, displacements and face wiping behaviour were identified. Based on behavioural observations, the diurnal activity was divided into four categories: resting, displacement, teeding and maintenance. The time spent in each category varied seasonally and the squirrels spent more time resting during win...

  11. Hemoglobin function and allosteric regulation in semi-fossorial rodents (family Sciuridae) with different altitudinal ranges (United States)

    Revsbech, Inge G.; Tufts, Danielle M.; Projecto-Garcia, Joana; Moriyama, Hideaki; Weber, Roy E.; Storz, Jay F.; Fago, Angela


    SUMMARY Semi-fossorial ground squirrels face challenges to respiratory gas transport associated with the chronic hypoxia and hypercapnia of underground burrows, and such challenges are compounded in species that are native to high altitude. During hibernation, such species must also contend with vicissitudes of blood gas concentrations and plasma pH caused by episodic breathing. Here, we report an analysis of hemoglobin (Hb) function in six species of marmotine ground squirrels with different altitudinal distributions. Regardless of their native altitude, all species have high Hb–O2 affinities, mainly due to suppressed sensitivities to allosteric effectors [2,3-diphosphoglycerate (DPG) and chloride ions]. This suppressed anion sensitivity is surprising given that all canonical anion-binding sites are conserved. Two sciurid species, the golden-mantled and thirteen-lined ground squirrel, have Hb–O2 affinities that are characterized by high pH sensitivity and low thermal sensitivity relative to the Hbs of humans and other mammals. The pronounced Bohr effect is surprising in light of highly unusual amino acid substitutions at the C-termini that are known to abolish the Bohr effect in human HbA. Taken together, the high O2 affinity of sciurid Hbs suggests an enhanced capacity for pulmonary O2 loading under hypoxic and hypercapnic conditions, while the large Bohr effect should help to ensure efficient O2 unloading in tissue capillaries. In spite of the relatively low thermal sensitivities of the sciurid Hbs, our results indicate that the effect of hypothermia on Hb oxygenation is the main factor contributing to the increased blood–O2 affinity in hibernating ground squirrels. PMID:24172889

  12. Note on breeding and parental care behaviours of albino Hoary-bellied Squirrel Callosciurus pygerythrus (Rodentia: Sciuridae in Sibsagar District of Assam, India

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    G. Kalita


    Full Text Available A few individuals of albino Horay-bellied Squirrels along with normal gray individuals of Callosciurus pygerythrus have been observed in Sibsagar district of Assam, India. One albino female was studied in captivity. This paper presents our observations on the breeding behaviour and the parental care exhibited by the albino squirrel in captivity. The squirrel bred twice in captivity with a normal male of the same species. In both the periods, a single male baby with normal coat colour developed. Oral dose of vitamin E has been found helpful in the breeding of the studied squirrel species. The mother squirrel exhibited parental care by carrying her baby using her mouth, to a safer place during danger. However, the observed phenomenon is unlike that of the cat species. Some of the habitat ecology and feeding habits of the albino squirrels have also been studied, both in natural and in captive conditions.

  13. On the status of the Long-tailed Marmot Marmota caudata (Mammalia: Rodentia: Sciuridae in Kargil, Ladakh (Indian Trans-Himalaya

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    Tanveer Ahmed


    Full Text Available Two species of marmots occur in India, the Himalayan Marmot Marmota himalayana and the Long-tailed Marmot or Golden Marmot Marmota caudata.  Marmots constitute part of the diet of some globally endangered carnivores in the Trans-Himalaya, yet studies on marmots in India are scanty.  Besides, the status of the Long-tailed Marmot is still unknown in India.  Considering this, a survey was carried out in Rangdum Valley, Kargil between May and July 2011 to collect baseline information on the Long-tailed Marmot.  Trails and roads were explored through walk and slow moving vehicle, respectively.  The Long-tailed Marmot was found to have a density of 14.31±2.10 per and an encounter rate of 2.86±0.42 per km.  Most of the observations of Long-tailed Marmot were in hilly areas (77.7%, lower slope (48.8% and herbaceous meadow (38.0%.  The current information is expected to bring concern towards this lesser known species in India.  

  14. New contribution to the palaeoichnology and taphonomy of the Ahníkov fossil site, Early Miocene, Most Basin (The Czech Republic)

    Czech Academy of Sciences Publication Activity Database

    Ekrt, B.; Mikuláš, Radek; Wagner, J.; Čermák, Stanislav; Procházková, K.; Kadlecová, E.; Fejfar, O.


    Roč. 72, 3/4 (2016), s. 202-214 ISSN 2533-4050 Institutional support: RVO:67985831 Keywords : biting traces * bone-mammal interaction * Czech Republic * Early Miocene * Most Basin * palaeoichnology * Sciuridae * taphonomy Subject RIV: DB - Geology ; Mineralogy

  15. Ecological scale and forest development: squirrels, dietary fungi, and vascular plants in managed and unmanaged forests. (United States)

    A.B. Carey; J. Kershner; B. Biswell; L.S. Dominguez de Toledo


    Understanding ecological processes and their spatial scales is key to managing ecosystems for biodiversity, especially for species associated with late-seral forest. We focused on 2 species of squirrel (Sciuridae: northern flying squirrel, Glaucomys sabrinus, and Townsend's chipmunk, Tamias townsendii) in a crosssectional survey of managed and natural stands in...

  16. Multilocus phylogeography of the European ground squirrel: cryptic interglacial refugia of continental climate in Europe

    Czech Academy of Sciences Publication Activity Database

    Říčanová, Štěpánka; Koshev, Y.; Říčan, O.; Ćosić, N.; Ćirović, D.; Sedláček, F.; Bryja, Josef


    Roč. 22, č. 16 (2013), s. 4256-4269 ISSN 0962-1083 R&D Projects: GA MŠk LC06073 Institutional support: RVO:68081766 Keywords : biogeography * microsatellites * mtDNA * Sciuridae * souslik Subject RIV: EG - Zoology Impact factor: 5.840, year: 2013

  17. Allometric disparity in rodent evolution


    Wilson LAB


    In this study, allometric trajectories for 51 rodent species, comprising equal representatives from each of the major clades (Ctenohystrica, Muroidea, Sciuridae), are compared in a multivariate morphospace (=allometric space) to quantify magnitudes of disparity in cranial growth. Variability in allometric trajectory patterns was compared to measures of adult disparity in each clade, and dietary habit among the examined species, which together encapsulated an ecomorphological breadth. Results ...

  18. An approximation to the fauna associated with oak forests of Guantiva- La Rusia - Iguaque corridor (Boyaca-Santander, Colombia)

    International Nuclear Information System (INIS)

    Saenz Jimenez, Fausto Alexis


    There were 380 species of vertebrates in the Guantiva - La Rusia - Iguaque corridor, distributed in 256 birds, 83 mammals, 31 amphibians and 10 reptiles. Twenty correspond to endangered species (10 amphibians, 8 birds and 2 mammals), 28 to endemic species (21 amphibians, 5 birds and 3 mammals) and 15 to migratory bird species. One hundred and three species were associated with oak forests of the corridor; comprising 62 birds, 18 mammals, 22 amphibians and 1 reptile species. Birds of the families Cracidae, Grallaridae, Phasianidae, Picidae, Psittacidae Trogonidae, mammals of the families Phyllostomidae, Sciuridae, Centrolenidae and amphibians of the family Strabomantidae had the highest number of species associated with oak. The amphibians were most frequently associated with these ecosystems, since 58% of the species of this group have a preference for habitats with oak presence.

  19. Endoparasites of rodents from the Chittagong Hill Tracts in Southeastern Bangladesh. (United States)

    Fuehrer, Hans-Peter; Baumann, Timo A; Riedl, Julia; Treiber, Moritz; Igel, Petra; Swoboda, Paul; Joachim, Anja; Noedl, Harald


    Rodents are a key mammalian group highly successful in adapting to a variety of environments throughout the world and play an important role in many zoonotic cycles. Within this project, the gastrointestinal and extraintestinal parasite fauna of 76 rodents (Muroidea and Sciuridae) was determined in the District of Bandarban (Chittagong Hill Tracts) in Southeastern Bangladesh. Gastrointestinal and extraintestinal parasites were examined with macro- and microscopical tools (e.g. Ziehl-Neelsen Staining) at a field site in Bandarban. A wide variety of parasites were found in rodent hosts, including protozoa-Giardia sp. (n = 8), Cryptosporidium sp. (n = 1), Entamoeba sp. (n = 8), Trichomonadida (n = 4), Isospora sp. (n = 1), trematodes (Echinostoma sp.; n = 3), cestodes-Hymenolepis nana (n = 1), Hymenolepis diminuta (n = 3), Hymenolepis sp. (n = 2), Taenia taeniaeformis-Larven (n = 4), Catenotaenia sp. (n = 1), Taenia sp. (n = 1), nematodes-Heterakis spumosa (n = 4), Heterakis sp. (n = 1), Aspiculuris tetraptera (n = 2), Capillaria hepatica (n = 2), Capillaria sp. (n = 3), Syphacia sp. (n = 2), Strongyloides sp. (n = 10), Trichostrongylus sp. (n = 2) and Trichuris sp. (n = 1)-and acanthocephalans (Moniliformis moniliformis; n = 2). Several of the examined parasites are of zoonotic importance via direct or indirect transmission (e.g. C. hepatica) and may affect humans.

  20. Rodent Species Distribution and Hantavirus Seroprevalence in Residential and Forested areas of Sarawak, Malaysia. (United States)

    Hamdan, Nur Elfieyra Syazana; Ng, Yee Ling; Lee, Wei Bin; Tan, Cheng Siang; Khan, Faisal Ali Anwarali; Chong, Yee Ling


    Rodents belong to the order Rodentia, which consists of three families in Borneo (i.e., Muridae, Sciuridae and Hystricidae). These include rats, mice, squirrels, and porcupines. They are widespread throughout the world and considered pests that harm humans and livestock. Some rodent species are natural reservoirs of hantaviruses (Family: Bunyaviridae) that can cause zoonotic diseases in humans. Although hantavirus seropositive human sera were reported in Peninsular Malaysia in the early 1980s, information on their infection in rodent species in Malaysia is still lacking. The rodent populations in residential and forested areas in Sarawak were sampled. A total of 108 individuals from 15 species of rodents were collected in residential ( n = 44) and forested ( n = 64) areas. The species diversity of rodents in forested areas was significantly higher (H = 2.2342) compared to rodents in residential areas (H = 0.64715) ( p Sarawak, East Malaysia. The results suggested that hantavirus was not circulating in the studied rodent populations in Sarawak, or it was otherwise at a low prevalence that is below the detection threshold. It is important to remain vigilant because of the zoonotic potential of this virus and its severe disease outcome. Further studies, such as molecular detection of viral genetic materials, are needed to fully assess the risk of hantavirus infection in rodents and humans in this region of Malaysia.

  1. Data from camera surveys identifying co-occurrence and occupancy linkages between fishers (Pekania pennanti, rodent prey, mesocarnivores, and larger predators in mixed-conifer forests

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    Rick A. Sweitzer


    Full Text Available These data provide additional information relevant to the frequency of fisher detections by camera traps, and single-season occupancy and local persistence of fishers in small patches of forest habitats detailed elsewhere, “Landscape Fuel Reduction, Forest Fire, and Biophysical Linkages to Local Habitat Use and Local Persistence of Fishers (Pekania pennanti in Sierra Nevada Mixed-conifer Forests” [10]. The data provides insight on camera trap detections of 3 fisher predators (bobcat [Lynx rufus]. Coyote [Canis latrans], mountain lion [Puma concolor], 5 mesocarnivores in the same foraging guild as fishers (gray fox [Urocyon cinereoargenteus] ringtail [Bassariscus astutus], marten [Martes americana], striped skunk [Mephitis mephitis] spotted skunk [Spilogale gracilis], and 5 Sciuridae rodents that fishers consume as prey (Douglas squirrel [Tamiasciurus douglasii], gray squirrel [Sciurus griseus], northern flying squirrel [Glaucomys sabrinus], long-eared chipmunk [Neotamias quadrimaculatus], California ground squirrel [Spermophilus beecheyi]. We used these data to identify basic patterns of co-occurrence with fishers, and to evaluate the relative importance of presence of competing mesocarnivores, rodent prey, and predators for fisher occupancy of small, 1 km2 grid cells of forest habitat. Keywords: Carnivores, Competition, Distribution, Foraging guild, Predation, Tree squirrels

  2. Physiologic Reference Ranges for Captive Black-Tailed Prairie Dogs (Cynomys ludovicianus) (United States)

    Keckler, M Shannon; Gallardo-Romero, Nadia F; Langham, Gregory L; Damon, Inger K; Karem, Kevin L; Carroll, Darin S


    The black-tailed prairie dog (Cynomys ludovicianus) is a member of the order Rodentia and the family Sciuridae. Ecologically, prairie dogs are a keystone species in prairie ecology. This species is used as an animal model for human gallbladder disease and diseases caused by infection with Clostridium difficile, Yersinia pestis, Francisella tularensis, and most recently, Orthopoxvirus. Despite increasing numbers of prairie dogs used in research and kept as pets, few data are available on their baseline physiology in animal facility housing conditions. To establish baseline physiologic reference ranges, we designed a study using 18 wild-caught black-tailed prairie dogs. Telemetry data were analyzed to establish circadian rhythms for activity and temperature. In addition, hematologic and serum chemistry analyses were performed. Baseline measurements were used to establish the mean for each animal, which then were compiled and analyzed to determine the reference ranges. Here we present physiologic data on serum chemistry and hematology profiles, as well as weight, core body temperature, and daily activity patterns for black-tailed prairie dogs. These results reflect the use of multiple measurements from species- and age-matched prairie dogs and likely will be useful to ecologists, scientists interested in using this animal model in research, and veterinarians caring for pet prairie dogs. PMID:20587156

  3. Checklist of mammals from Mato Grosso do Sul, Brazil

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    Walfrido Moraes Tomas

    Full Text Available Abstract We updated the checklist of mammals from Mato Grosso do Sul, Brazil based on primary records only. One hundred and sixty-six mammal species were listed as occurring in the state, 47 of them being medium to large, 47 small mammal and 73 bat species. The listed species are distributed in 31 families: Didelphidae (17 spp., Dasypodidae (7 spp., Myrmecophagidae (2 spp., Cebidae (1 sp., Callithrichidae (2 spp., Aotidae (1 sp., Pitheciidae (1 sp., Atelidae (1 sp., Leporidae (1 sp., Felidae (7 spp., Canidae (4 spp., Mustelidae (5 spp., Mephitidae (2 spp., Procyonidae (2 spp., Tapiridae (1 sp., Tayassuidae (2 spp., Cervidae (4 spp., Sciuridae (1 sp., Cricetidae (22 spp., Erethizontidae (1 sp., Caviidae (3 spp., Dasyproctidae (1 sp., Cuniculidae (1 sp., Echimyidae (4 spp., Phyllostomidae (41 spp., Emballonuridae (2 spp., Molossidae (16 spp., Vespertilionidae (9 spp., Mormoopidae (1 sp., Noctilionidae (2 spp., and Natalidade (1 sp.. These numbers represent an increase of fourteen species with primary records for the state in comparison with the previously published checklist. However, it is evident the scarcity of information at several regions of the state, and the need of implementation of regional zoological collections. The state of Mato Grosso do Sul represent only 4.19% of the Brazilian territory, but the number of mammal species reach 24.13% of the known species occurring in the country.

  4. The Enterobiinae subfam. Nov. (Nematoda, Oxyurida) pinworm parasites of primates and rodents. (United States)

    Hugot, J P; Gardner, S L; Morand, S


    Recent redescriptions of most members of the Oxyuridae Cobbold, 1864 parasitic in primates revealed that they share following derived characters: sexual dimorphism of lateral alae (single-crested in the males, double-crested in the females); in males a second pair of genital papillae always surrounded by strongly cuticularized rings; in females, uterine tube divided into 2 parts by a cellular wall forming a diaphragm. These characters are interpreted as synapomorphies, providing evidence that these taxa represent a monophyletic group, and we propose to classify them in a new subfamily of the Oxyuridae: the Enterobiinae subfam.nov. The Enterobiinae as recognized herein occurs in both Old World and New World Primates and rodents of the family Sciuridae (tribe Sciurini in the Holarctic region and tribe Xerini in the Ethiopian region). The new subfamily includes the following genera: Enterobius Leach, 1853; Colobenterobius Quentin, Betterton & Krishnasamy, 1979; Rodentoxyuris Quentin & Tenora 1974; Xeroxyuris Hugot, 1995; Lemuricola Chabaud & Petter, 1959; Protenterobius Inglis, 1961; Madoxyuris Chabaud, Brygoo & Petter, 1965; Trypanoxyuris Vevers, 1923; Hapaloxyuris Inglis & Cosgrove, 1965 and Paraoxyuronema Artigas, 1936. The genus Paraoxyuronema is revalidated as a subgenus of Trypanoxyuris due to its specialized buccal structures. This genus groups all pinworm nematodes specific for primates of the family Atelidae, including: P. brachytelesi Artigas, 1937 occurring in Brachyteles arachnoides; P. atelis (Cameron, 1929) occurring in Ateles spp., and P. duplicidens (Buckley, 1931) and P. lagothricis (Buckley, 1931), which are parasites of Lagothrix spp. Inglisoxyuris inglisi Chabaud, Petter & Golvan, 1961, included in the monospecific genus Inglisoxyuris and previously classified as a subgenus of the Lemuricola, does not share the characters of the new subfamily and, until its precise classification can be considered with more information, it is proposed to refer to