Yonenaga's Atlantic Spiny Rat

Trinomys yonenagae és una espècie de rosegador de la família de les rates espinoses. És endèmica de l'estat de Bahia (Brasil). El seu hàbitat natural són les dunes i inclou gran part del camp de dunes del marge esquerre del curs mitjà del riu São Francisco. Està amenaçada per l'extracció de sorra del seu entorn.^[1]

Aquest tàxon fou anomenat en honor de la biòloga brasilera Yatiyo Yonenaga-Yassuda.^[2]

Referències

Yonenaga's Atlantic spiny-rat (Trinomys yonenagae) or torch-tail spiny rat is a spiny rat species endemic to Brazil.^[1][3][4] Locally, it is known as rabo de facho.^[5] Named for Yatiyo Yonenaga-Yassuda, a cytogenetics researcher,^[2] it is considered an endangered species due to its highly restricted distribution and ongoing habitat loss.^[1] Genetic evidence shows that it diverged from its closest living relative, the hairy Atlantic spiny rat, around 8.5 million years ago, during the Late Miocene.^[6]

Description

This is a comparatively small spiny rat, with an average head and body length of 16 centimetres (6.3 in) and a tail that averages 19 centimetres (7.5 in) long. It has large hind feet which, together with the long tail, are likely related to the fact that it mainly moves by hopping. The ears are also unusually large, as are the bony structures surrounding the inner ear. The fur is near-white on the underparts, but is otherwise grey in infants, changing to a richer brown colour as the animal reaches adulthood. Despite the name, the fur is mostly soft, although there are longer, flexible, dark-coloured bristles scattered across the body that correspond to the spines on most other spiny rats.^[7] An enlarged and modified sebaceous gland is present near the anus, and produces a secretion described as having a "tutti-frutti-like" odour.^[5]

Distribution and habitat

Yonenaga's Atlantic spiny rat is known only from an approximately 130 kilometres (81 mi) stretch of the west bank of the São Francisco River in Bahia state, Brazil.^[8] This region is covered by sandy dunes on the border between the cerrado and caatinga habitats of eastern Brazil.^[4] It is considered a semi-arid habitat,^[9] with the sparse local plant life dominated by cactuses and bromeliads.^[10]

Behaviour

Despite living in a hot, dry, and sandy environment, Yonenaga's Atlantic spiny rat has few of the anatomic and physiologic adaptations expected of a desert-dwelling animal^[11] and instead relies on its behaviour to avoid the worst of the local conditions. It is nocturnal,^[12] and unlike other, closely related, spiny rats, digs burrows in which it spends the day.^[2] The burrows are shared communally, typically located in valleys between sand dunes where plants can provide local shade, and may extend 15 metres (49 ft) below the surface.^[4] They are omnivorous, eating some insects, but primarily feeding on the local vegetation, including araçá-boi fruit, from which they obtain much of their water.^[7]

Each burrow system is shared by up to eight adults, plus a variable number of young. The species does not appear to be territorial, and multiple females living in the same burrow raise young simultaneously.^[4] While aggression between neighbours is occasionally seen, most social behaviours are affiliative, including grooming, nose-to-nose or nose-to-ear rubbing and huddling. Even when intruders of the same species enter the burrow system, aggression is limited, and the individuals are more likely to huddle together than to fight.^[13][7] As vision is limited in their environment, in addition to vocal communication^[14] and drumming with their feet as warning signals,^[7] they rely on scents from anal glands to provide cues to identify and discern intentions of other rodents in the colony.^[5]

Reproduction

Yonenaga's Atlantic spiny rat breeds throughout the year, although young born during the dry season are much less likely to survive. Courtship involves foot-stamping, calls, and neck-biting by the males. The species is thought to be monogamous, but individuals of both sexes have been recorded helping to care for young that are not their biological offspring within the communal burrows. Pregnancy lasts for three months, and typically results in the birth of two young. The young are born with fine grey fur, with their eyes open and already able to move around. Sexual maturity occurs between three and four months of age, and the young may remain in the burrow of their birth well into adulthood, rather than dispersing to establish a new colony. In captivity they have been reported to live for up to 13 years, unusually long for a rodent of their size.^[7]

References

Trinomys yonenagae es una especie de roedor de la familia Echimyidae.

Distribución geográfica

Se encuentra en Brasil.

Referencias

• Infonatura

• Woods, C. A. and C. W. Kilpatrick. 2005. Hystricognathi. Pp 1538-1600 in Mammal Species of the World. A Taxonomic and Geographic Reference. Tercera edición. D. E. Wilson and D. M. Reeder eds. Smithsonian Institution Press, Washington D.C.

Trinomys yonenagae Trinomys generoko animalia da. Karraskarien barruko Eumysopinae azpifamilia eta Echimyidae familian sailkatuta dago.

Erreferentziak

• Trinomys yonenagaeri buruzko informazioa Mammals of The World datubasean

Ikus, gainera

• Trinomys
• Echimyidae

Trinomys yonenagae est une espèce de mammifères rongeurs de la famille des Echimyidae qui regroupe des rats épineux originaires d'Amérique latine. C'est une espèce en danger (EN).

Trinomys yonenagae is een zoogdier uit de familie van de stekelratten (Echimyidae). De wetenschappelijke naam van de soort werd voor het eerst geldig gepubliceerd door Rocha in 1995.

Voorkomen

Leefgebied

De soort komt voor in Brazilië.

O rabo-de-facho^[1] (Trinomys yonenagae) é uma espécie de roedor da família Echimyidae.

É endêmica do Brasil, onde pode ser encontrada somente no estado da Bahia.

Referências

Referências

• WOODS, C. A.; KILPATRICK, C. W. Infraorder Hystricognathi. In: WILSON, D. E.; REEDER, D. M. (Eds.). Mammal Species of the World: A Taxonomic and Geographic Reference. 3. ed. Baltimore: Johns Hopkins University Press, 2005. v. 2, p. 1538-1600.
• CATZEFLIS, F.; PATTON, J.; PERCEQUILLO, A.; BONVICINO, C.; WEKSLER, M. 2008. Trinomys yonenagae. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. . Acessado em 17 de novembro de 2008.

Trinomys yonenagae är en gnagare i familjen lansråttor som förekommer i Brasilien.^[2]

Arten blir 141 till 195 mm lång (huvud och bål), har en 169 till 225 mm lång svans, har 41 till 51 mm långa bakfötter och 20 till 27 mm stora öron. Pälsen är allmänt mjukare än hos andra släktmedlemmar. De stora täckhåren som är inblandade i ryggens päls är 16 till 19 mm långa samt 0,6 mm breda och inte styv som hos övriga arter i släktet Trinomys. Den ljusa kanelbruna pälsen på ovansidan blir på kroppssidorna ännu ljusare och på undersidan finns vit päls. Även svansen är uppdelad i en brun ovansida och en ljus undersida.^[3]

Denna lansråtta lever vid floden São Francisco i delstaten Bahia i östra Brasilien. Den vistas på sandbankar och sanddyner intill floden.^[1]

Trinomys yonenagae gräver underjordiska tunnelsystem. De används av flera individer från olika kön men gemensamma sovplatser förekommer bara i vissa fall.^[1]

Arten hotas av habitatförstöring. Beståndet minskar och dessutom är utbredningsområdet begränsat. IUCN listar Trinomys yonenagae därför som starkt hotad (EN).^[1]

Referenser

1. ^ [a b c d] Roach, N. & Naylor, L. 2016 Trinomys yonenagae Från: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2 <www.iucnredlist.org>. Läst 2018-02-22.
2. ^ [a b] Wilson, Don E., and DeeAnn M. Reeder, eds. (2005) , Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., Trinomys yonenagae
3. ^ Patton, Pardiñas & D’Elía, red (2015). ”Trinomys yonenagae” (på engelska). Mammals of South America, Volume 2. University of Chicago Press. sid. 1017. ISBN 0-226-28240-6

• 1 Етимологія
• 2 Морфологія
• 3 Загрози та охорона
• 4 Джерела

1. ↑ ^{а б} Веб-сайт МСОП
2. ↑ Bo Beolens, Michael Watkins, Michael Grayson The eponym dictionary of mammals - JHU Press, 2009, p. 456
3. ↑ John Frederick Eisenberg, Kent Hubbard Redford Mammals of the Neotropics: The central neotropics: Ecuador, Peru, Bolivia, Brazil - University of Chicago Press, 1999, p. 498

Trinomys yonenagae là một loài động vật có vú trong họ Echimyidae, bộ Gặm nhấm. Loài này được Rocha miêu tả năm 1995.^[2]

Hình ảnh

Chú thích

Tham khảo

• Dữ liệu liên quan tới Trinomys yonenagae tại Wikispecies
• Phương tiện liên quan tới Trinomys yonenagae tại Wikimedia Commons

Bài viết về một loài thuộc bộ Gặm nhấm này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn.

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요네나가대서양가시쥐(Trinomys yonenagae)는 가시쥐과에 속하는 남아메리카 설치류이다.^[2] 요네나가대서양가시쥐는 굴을 파는 설치류로 무리를 지어 생활한다. 시력이 제한된 환경에서 살기 때문에, 무리 속에서 다른 설치류를 구별하고 의사를 표시하는 신호로써 항문샘의 냄새에 의존한다.^[3]

각주