PDF | Anoura geoffroyi Gray, , is a phyllostomid bat commonly referred to as Geoffroy’s tailless bat. This bat is broadly distributed in the. PDF | In , Wilhelm Peters described Glossonycteris lasiopyga, based on a specimen provided by Henri de Saussure and collected in México. The type. AnAge entry for Anoura geoffroyi. Classification (HAGRID: ) Genus: Anoura; Species: Anoura geoffroyi; Common name: Geoffroy’s tailless bat.

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Anoura geoffroyi Gray,is a phyllostomid bat commonly referred to as Geoffroy’s tailless bat. This bat is broadly distributed in the Neotropics from both versants of Mexico into northern and western South America and the Amazon Basin.

It is not of special conservation concern because it is abundant throughout its geofvroyi.

Anoura geoffroyi Gray, Anoura Geoffroyi Gray, Ch [ oeronycteris ]. Not Glossophaga ecaudata Geoffroy, Glossonycteris lasiopyga Peters, Anoura geoffroyi antricola Anthony, C geoffroyo and C ontent. Order Chiroptera, suborder Microchiroptera, family Phyllostomidae, subfamily Glossophaginae, tribe Glossophagini.

Geoffroy’s tailless bat

The skull of A. Anoura geoffroyi covered with pollen, from Cuernavaca, Morelos. Used with permission of the photographer, J.

Greatest length of skull is Used with permission snoura the photographer, L. Anoura geoffroyi is a medium-sized neotropical bat without a geoffdoyi. The interfemoral membrane is small and hairy, and the heel bone is very short Gray The dorsal pelage is dark to gray-brown with the base of individual hairs more pale.

The pelage of the ventral torso is gray-brown, becoming silvery gray over the sides of the neck and shoulders Hall Wing and tail membranes are black or blackish brown Emmons and Feer Ears are short, rounded, and fused over the forehead.

The muzzle is elongated and the lower jaw extends well beyond the upper jaw Emmons and Feer Bases of forearms, legs, and toes are hairy; sides of feet are covered with very short hair Reid The braincase tapers anteriorly; the rostrum is thickened. The posterior margin of the palate is barely geoffriyi on the posterior palatal extension; pterygoids are inflated posteriorly, annoura the elongated mesopterygoid fossa Handley It also occurs on Trinidad and Grenada Eisenberg and Redford No fossils are known.

The aspect ratio of the wings of A. The cerebrum of A.

Geoffroy’s tailless bat – Wikipedia

Cerebral hemispheres are the largest in any member of the subfamily. The olfactory bulbs are large and pseudotemporal lobes are shallow. The interhemispheric sulcus that bulges to form a shallow cingulated sulcus terminates above the geoffroyk callosum. There is no callosal sulcus.

Substantia alba and cortical cells together form a thicker layer than the overlying cortex. Lateral thalamic nuclei are situated slightly above the habernular.

Amygdaloid nuclei are small and thalamic nuclei form a wide, shallow body. A dense layer of cell bodies occurs along the external margin of interhemispheric sulcus. The pons is wide and shallow and has a flat ventral surface. Inferior olivary nuclei are small; superior olivary nuclei are large McDaniel Other histological and morphological details of the brain are presented in McDaniel The dental formula for A.


The upper aonura are reduced and separated by a gap. The coronal portion of the dentin is characterized by distinct tubules that follow an S-shaped path from the pulpal chamber to the dentino-enamel junction. The pulp is simple and the cementoid layer is thin.

The tongue is narrow, elongate, and highly extensible, with a pointed apex, but without lateral grooves. The anterior one-third of the tongue has rows of vertical hairlike papillae that function to load nectar by capillary action.

In the tongue, muscle fibers form a system of longitudinal, vertical, and transverse bundles that reduce its depth and diameter Phillips ; Phillips et al. The genioglossus is highly developed into a leaflike form and contributes to extensibility of the tongue.

Anoura geoffroyi prefers sucrose over glucose, fructose, and a glucose—fructose mixture Herrera A highly effective pyloric sphincter in A. Villi in the intestine of A.

Villi are digitate or club-shaped and may be interspersed among transverse folds Forman et al. The acrosome is shorter and broader than the nucleus and contributes imperceptibly to the total length of the sperm head.

Apices and nuclei of spermatozoids are usually broadly rounded. The junction of the neck of the sperm with the head is slightly off-center. The midpiece of the sperm is wide at its anterior end, but tapers abruptly by the posterior end.

The sex ratio of neonates was 1: A discrete monestrous reproductive cycle may occur late in the rainy season Wilson Sexually segregated colonies of A. Histological examinations indicated that females become pregnant in July or August and give birth in late November, in Trinidad, West Indies Heideman et al.

Two females, each with 1 embryo, were captured in June in southern Bolivia Andersonand pregnant females were captured from May to August in eastern lowlands and Andean highlands of Peru Graham ; Tuttle Testes and epididymides were small from September to mid-April in bats collected in Trinidad, increased in mass in late May, and reached peak mass in July, which corresponded to histological evidence for impregnation of females in July.

Spermatogenesis occurred from May to August Heideman et al. Annual reproduction has been reported to be synchronized with daylight. Other studies have failed to demonstrate a circannual rhythm of reproduction of male A. Seasonal and endogenous reproductive cycles are not regulated by photoperiod because testis growth patterns in the laboratory are the same as those in a wild population Heideman and Bronson The birthing process in A. The time of year for parturition in 1 female that gave birth in a laboratory was similar to that of bats in the field Heideman et al.


Anoura geoffroyi roosts in a variety of refuges that include caves and tunnels Reid near streams and in orchards, croplands, evergreen pine forests, deciduous Quercus forests, and cloud forests Ceballos and Galindo ; Handley A roosting colony of both sexes was reported in a temperate cave of Mexico Galindo-Galindo et al.

Anoura geoffroyi roosts in mixed-species colonies with Artibeus amplus, A. It also shares roost caves with oil birds Steatornis caripensis — Goodwin and Greenhall Anoura geoffroyi is considered to be insectivorous and facultative nectarivorous throughout its range Gardneralthough a strictly nectar diet was reported for A. Stomach contents of A. The thrips and ants were presumably consumed incidentally to nectar feeding, but the beetles and moths were probably too large ca.

In edaphic Cerrado of northeastern Brazil, stomachs of A. This diet was similar to that of other members of an insectivorous feeding guild that included Phyllostomus discolor, P.

Streblid batflies found on A. Other ectoparasites reported for A. Nematodes such as Litomosoides brasiliensis also are reported for A. Under controlled laboratory conditions, Anoura geoffroyi can use visual cues to escape but uses echolocation in the absence of visual cues Chase While navigating through a laboratory obstacle course, A.

Hearing sensitivity has been measured by recording cochlear potentials at different sound frequencies. Hearing is most sensitive in the to kHz range, although 1 individual displayed maximal sensitivity at 95 kHz.

Nightly activity by A. In flight, the species is swift and can hover, but it also does a quick backflip when alighting Goodwin and Greenhall The Y chromosome is acrocentric, and the X chromosome is submetacentric Baker The karyotype contains a large pair of submetacentrics, 6 pairs of small near metacentrics, and 1 large pair and 6 medium to small pairs of subtelocentrics or near subtelocentrics Baker An analysis of allelic frequenicies and heterozygosity values for A.

In Mexico, it is very abundant with a wide distribution; thus, it is not considered a species of special concern Arita and Ceballos Anoura is informally grouped with Choeroniscus, Choeronycteris, Hylonycteris, Lichonycterisand several other genera as 1 of the 2 subgroups within the tribe Glossophagini Carstens et al.

This species was named after E. Geoffroy Saint-Hilaire, its 1st collector Gray Vargas for access to the mammal collection. Oxford University Press is a department of the University of Oxford.

Geoffroy’s Tailless Bat (Anoura geoffroyi) ·

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