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Microbat

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Emballonuroidea
Rhinopomatoidea
Rhinolophoidea
Vespertilionoidea
Molossoidea
Nataloidea
Noctilionoidea

The microbats constitute the suborder Microchiroptera within the order Chiroptera bats Bats have been differentiated into Megachiroptera megabats and Microchiroptera, based on their size, but recent molecular evidence suggests a different subdivision Emma Teeling and Mark Springer include the horseshoe bats and four other microbat families in a new clade called Yinpterochiroptera together with the large fruit bats and others For most Microchiroptera species they created the Yangochiroptera clade

Contents

  • 1 Characteristics
    • 11 Differences from megabats
    • 12 Dentition
  • 2 Echolocation
    • 21 Production of ultrasonic waves
    • 22 Laryngeally echolocating microbats
    • 23 Other
  • 3 Classification
  • 4 References
  • 5 External links

Characteristics

Microbats are 4 to 16 cm 16–63 in long[1] Most microbats feed on insects, but some of the larger species hunt birds, lizards, frogs, smaller bats or even fish Only three species of microbat feed on the blood of large mammals or birds "vampire bats"; these bats live in South and Central America

The term "leaf-nose" does not indicate the diet preferred by particular species and is applied to a wide variety of microbats[2] Most leaf-nosed microbat species are fruit and nectar-eating However, three species follow the bloom of columnar cacti in northwest Mexico and the Southwest United States northward in the northern spring and then the blooming agaves southward in the northern fall autumn[3] Other leaf-nosed bats, such as Vampyrum spectrum of South America, hunt a variety of prey such as lizards and birds The horseshoe bats of Europe and California leaf-nosed bat have an incredibly intricate leaf-nose for echolocation and feed primarily on insects

Differences from megabats

  • Microbats use echolocation, whereas megabats do not typically The Egyptian fruit bat Rousettus egyptiacus is an exception, but does not use the larynx echolocation method of microbats, instead giving scientists the theory that it clicks using its nasal passages and back of its tongue
  • Microbats lack the claw at the second finger of the forelimb This finger appears thinner and almost bonded by tissue with the third finger for extra support during flight
  • Megabats always lack a tail, whereas this trait only occurs in certain species of microbats
  • The ears of microbats possess a tragus thought to be crucial in echolocation and are respectively larger than megabat ears, whereas megabat ears are comparatively small and lack a tragus
  • Megabat eyes are quite large, whereas microbat eyes are comparatively smaller

Dentition

Ventral view of a free-tailed microbat Genus Tadarida skull displaying a dilambdodont teeth pattern Specimen from the Pacific Lutheran University Natural History collection Frontal view of a free-tailed microbat Genus Tadarida skull displaying the canine teeth Specimen from the Pacific Lutheran University Natural History collection

The form and function of microbat teeth differ as a result of the various diets these bats can have Teeth are primarily designed to break down food; therefore, the shape of the teeth correlate to specific feeding behaviors[4] In comparison to megabats which feed only on fruit and nectar, microbats illustrate a range of diets and have been classified as insectivores, carnivores, sanguinivores, frugivores, and nectarivores[5] Differences seen between the size and function of the canines and molars among microbats in these groups vary as a result of this

The diverse diets of microbats reflect having dentition, or cheek teeth, that display a morphology derived from dilambdodont teeth, which are characterized by a W-shaped ectoloph, or stylar shelf[6] A W-shaped dilambdodont upper molar includes a metacone and paracone, which are located at the bottom of the “W”; while the rest of the “W” is formed by crests that run from the metacone and paracone to the cusps of the stylar self

Microbats display differences between the size and shape of their canines and molars, in addition to having distinctive variations among their skull features that contribute to their ability to feed effectively Frugivorous microbats have small stylar shelf areas, short molariform rows, and wide palates and faces In addition to having wide faces, frugivorous microbats have short skulls, which place the teeth closer to the fulcrum of the jaw lever, allowing an increase in jaw strength[7] Frugivorous microbats also possess a different pattern on their molars compared to carnivorous, insectivorous, nectarivorous, and sanguinivorous microbats[5] In contrast, insectivorous microbats are characterized by having larger, but fewer teeth, long canines, and shortened third upper molars; while carnivorous microbats have large upper molars Generally, microbats that are insectivores, carnivores, and frugivores have large teeth and small palates; however, the opposite is true for microbats that are nectarivores Though differences exist between the palate and teeth sizes of microbats, the proportion of the sizes of these two structures are maintained among microbats of various sizes[5]

Echolocation

Main article: Animal echolocation

Echolocation is the process where an animal produces a sound of certain wavelength, and then listens to and compares the reflected echoes to the original sound emitted Bats use echolocation to form images of their surrounding environment and the organisms that inhabit it by eliciting ultrasonic waves via their larynx[8][9] The difference between the ultrasonic waves produced by the bat and what the bat hears provides the bat with information about its environment Echolocation aids the bat in not only detecting prey, but also in orientation during flight[10]

Production of ultrasonic waves

Most microbats generate ultrasound with their larynx and emit the sound through their nose or mouth[11] Sound productions are generated from the vocal folds in mammals due to the elastic membranes that compose these folds Vocalization requires these elastic membranes because they act as a source to transform airflow into acoustic pressure waves Energy is supplied to the elastic membranes from the lungs, and results in the production of sound The larynx houses the vocal cords and forms the passageway for the expiratory air that will produce sound[12] Microbat  calls  range in frequency from 14,000 to over 100,000 hertz, well beyond the range of the human ear typical human hearing range is considered to be from 20 to 20,000 Hz The emitted vocalizations form a broad beam of sound used to probe the environment, as well as communicate with other bats

Laryngeally echolocating microbats

Ventral view of a Florida Freetail bat Tadarida cyanocephala skull, highlighting both the stylohyal and tympanic bones Specimen from the Pacific Lutheran University Natural History collection

Laryngeal echolocation is the dominant form of echolocation in microbats, however, it is not the only way in which microbats can produce ultrasonic waves Excluding non-echolocating and laryngeally echolocating microbats, other species of microbats and megabats have been shown to produce ultrasonic waves by clapping their wings, clicking their tongues, or using their nose[8] Laryngeally echolocating bats, in general, produce ultrasonic waves with their larynx that is specialized to produce sounds of short wavelength The larynx is located at the cranial end of the trachea and is surrounded by cricothyroid muscles and thyroid cartilage For reference, in humans, this is the area where the Adam's apple is located Phonation of ultrasonic waves is produced through the vibrations of the vocal membranes in the expiratory air The intensity that these vocal folds vibrate at varies with activity and between bat species[13] A characteristic of laryngeally echolocating microbats that distinguishes them from other echolocating microbats is the articulation of their stylohyal bone with their tympanic bone The stylohyal bones are part of the hyoid apparatus that help support the throat and larynx The tympanic bone forms the floor of the middle ear In addition to the connection between the stylohyal bone and the tympanic bone as being an indicator of laryngeally echolocating microbats, another definitive marker is the presence of a flattened and expanded stylohyal bone at the cranial end[9] Microbats that laryngeally echolocate must be able to distinguish between the differences of the pulse that they produce and the returning echo that follows by being able to process and understand the ultrasonic waves at a neuronal level, in order to accurately obtain information about their surrounding environment and orientation in it[8] The connection between the stylohyal bone and the tympanic bone enables the bat to neurally register the outgoing and incoming ultrasonic waves produced by the larynx[10] Furthermore, the stylohyal bones connect the larynx to the tympanic bones via a cartilaginous or fibrous connection depending on the species of bat Mechanically the importance of this connection is that it supports the larynx by anchoring it to the surrounding cricothryroid muscles, as well as draws it closer to the nasal cavity during phonation The stylohyal bones are often reduced in many other mammals, however, they are more prominent in laryngeally echolocating bats and are part of the mammalian hyoid apparatus The hyoid apparatus functions in breathing, swallowing, and phonation in microbats as well as other mammals An important feature of the bony connection in laryngeally echolocating microbats is the extended articulation of the ventral portion of the tympanic bones and the proximal end of the stylohyal bone that bends around it to make this connection[8]

Other

The human vocalization system has been extensively studied, and as a result, is the most well understood compared to any other mammal It has been instrumental in increasing our understanding of the vocalization systems of other mammals, including microbats In the past, the human vocalization system was believed to be unique when compared to any of the other mammal vocalization system's, because of their ability to produce complex language and song However, data has demonstrated that the human vocalization system is relatively similar to other mammal vocalization systems A common theme that has been identified in all tetrapods, including humans and microbats: 1 a respiratory system with lungs; 2 a vocal tract that filters emitted sound before it exits into the surrounding environment; and 3 every tetrapod has a larynx that quickly closes to function in protection of the lungs, as well as it often might function in phonation, as is the case in humans and microbats One feature of the mammal vocalization system that results in variation of sound production, especially for microbats and megabats, is the length of vocal folds The vocal folds determine the lowest frequency at which the folds can vibrate Compared to humans, the length of vocal folds in microbats are very small This allows them to generate their characteristic ultrasonic waves that are above the human hearing range In contrast, vocal folds of larger mammals, such as whales are greatly hypertrophied, which results in the production of infrasonic sounds far below the human hearing range[14]

Some moths have developed a protection against bats They are able to hear bats' ultrasounds and flee as soon as they notice these sounds, or stop beating their wings for some time to deprive the bats of the characteristic echo signature of moving wings on which they may home in To counteract this, the bats may cease producing the ultrasound bursts as they near prey, and thus avoid detection

Classification

The bats are from top to bottom and left to right: the greater mouse-eared bat, the lesser horseshoe bat, the brown long-eared bat, the common pipistrelle, the greater noctule bat, and the barbastelle, Romanian post miniature sheet, 2003

While bats have been traditionally divided into megabats and microbats, recent molecular evidence has shown the superfamily Rhinolophoidea to be more genetically related to megabats than to microbats, indicating the microbats are paraphyletic To resolve the paraphyly of microbats, the Chiroptera were redivided into suborders Yangochiroptera which includes Nycteridae, vespertilionoids, noctilionoids, and emballonuroids and Yinpterochiroptera, which includes megabats, rhinopomatids, Rhinolophidae, and Megadermatidae[15]

This is the classification according to Simmons and Geisler 1998:

Superfamily Emballonuroidea

  • Family Emballonuridae sac-winged bats or sheath-tailed bats

Superfamily Rhinopomatoidea

  • Family Rhinopomatidae mouse-tailed bats
  • Family Craseonycteridae bumblebee bat or Kitti's hog-nosed bat

Superfamily Rhinolophoidea

  • Family Rhinolophidae horseshoe bats
  • Family Nycteridae hollow-faced bats or slit-faced bats
  • Family Megadermatidae false vampires

Superfamily Vespertilionoidea

  • Family Vespertilionidae vesper bats or evening bats

Superfamily Molossoidea

  • Family Molossidae free-tailed bats
  • Family Antrozoidae pallid bats

Superfamily Nataloidea

  • Family Natalidae funnel-eared bats
  • Family Myzopodidae sucker-footed bats
  • Family Thyropteridae disk-winged bats
  • Family Furipteridae smoky bats

Superfamily Noctilionoidea

  • Family Noctilionidae bulldog bats or fisherman bats
  • Family Mystacinidae New Zealand short-tailed bats
  • Family Mormoopidae ghost-faced bats or moustached bats
  • Family Phyllostomidae leaf-nosed bats

References

  1. ^ Whitaker, JO Jr, Dannelly, HK & Prentice, DA 2004 Chitinase in insectivorous bats Journal of Mammalogy, 85, 15–18
  2. ^ Walker's Bats of the World, Ronald M Nowak 1994
  3. ^ A Natural History of the Sonoran Desert, Edited by Steven Phillips and Patricia Comus, University of California Press, Berkeley p 464
  4. ^ Evans, A R 2005 Connecting morphology, function and tooth wear in microchiropterans Biological Journal of the Linnean Society, 851, 81-96 doi:101111/j1095-8312200500474x
  5. ^ a b c Freeman, Patricia W, "Form, Function, and Evolution in Skulls and Teeth of Bats" 1998 Papers in Natural Resources 9
  6. ^ Myers, P, R Espinosa, C S Parr, T Jones, G S Hammond, and T A Dewey 2018 The Animal Diversity Web online Accessed at https://animaldiversityorg
  7. ^ Freeman, P W 1988 Frugivorous and animalivorous bats Microchiroptera: dental and cranial adaptations Biological Journal of the Linnean Society, 333, 249-272 Retrieved from https://academicoupcom/biolinnean/article/33/3/249/2646853 Jump up ^
  8. ^ a b c d Davies, Kalina TJ; Maryanto, Ibnu; Rossiter, Stephen J 2013-01-01 "Evolutionary origins of ultrasonic hearing and laryngeal echolocation in bats inferred from morphological analyses of the inner ear" Frontiers in Zoology 10: 2 doi:101186/1742-9994-10-2 ISSN 1742-9994 PMC 3598973  PMID 23360746 
  9. ^ a b Reichard, Jonathan D; Fellows, Spenser R; Frank, Alexander J; Kunz, Thomas H 2010-11-01 "Thermoregulation during Flight: Body Temperature and Sensible Heat Transfer in Free-Ranging Brazilian Free-Tailed Bats Tadarida brasiliensis" Physiological and Biochemical Zoology 83 6: 885–897 doi:101086/657253 ISSN 1522-2152 
  10. ^ a b Berke, Gerald S; Long, Jennifer L 2010-01-01 Brudzynski, Stefan M, ed Handbook of Behavioral Neuroscience Handbook of Mammalian VocalizationAn Integrative Neuroscience Approach 19 Elsevier pp 419–426 
  11. ^ Hedenström, Anders; Johansson, L Christoffer 2015-03-01 "Bat flight: aerodynamics, kinematics and flight morphology" Journal of Experimental Biology 218 5: 653–663 doi:101242/jeb031203 ISSN 0022-0949 PMID 25740899 
  12. ^ Holbrook, K A; Odland, G F 1978-05-01 "A collagen and elastic network in the wing of the bat" Journal of Anatomy 126 Pt 1: 21–36 ISSN 0021-8782 PMC 1235709  PMID 649500 
  13. ^ Simmons, Nancy B; Seymour, Kevin L; Habersetzer, Jörg; Gunnell, Gregg F 2010-08-19 "Inferring echolocation in ancient bats" Nature 466 7309: E8–E8 doi:101038/nature09219 ISSN 0028-0836 
  14. ^ Fitch, T 2006 "Production of Vocalizations in Mammals" doi:101016/B0-08-044854-2/00821-X 
  15. ^ Teeling, E C; Madsen, O; Van de Bussche, R A; de Jong, W W; Stanhope, M J; Springer, M S 2002 "Microbat paraphyly and the convergent evolution of a key innovation in Old World rhinolophoid microbats" Proceedings of the National Academy of Sciences of the United States of America 99 3: 1431–1436 doi:101073/Pnas022477199 PMC 122208  PMID 11805285 

External links

  • Bat World Sanctuary
  • Illustrated Identification key to the bats of Europe see "Recent publications"
  • Bat Conservation International
  • View the myoLuc2 genome assembly in the UCSC Genome Browser

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