Endo's pipistrelle

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Endo's pipistrelle
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Chiroptera
Family: Vespertilionidae
Genus: Pipistrellus
P. endoi
Binomial name
Pipistrellus endoi
Imaizumi, 1959
Pipistrellus endoi distribution.png
Distribution of Endo's pipistrelle

Endo's pipistrelle (Pipistrellus endoi) is a species of vesper bat that is endemic to Japan. It is found in temperate forests.[1]


This species was described by Japanese zoologist Yoshinori Imaizumi in 1959.[2] He named it endoi after Kimio Endo, saying that Endo was deserving of the honor because he had "recently collected several important specimens of bats in Iwate Prefecture, including the type specimen of this species."[3]


It is similar in appearance to the Japanese house bat.[4] The baculum, however, is different. Its baculum is short and relatively straight, measuring 9–10 mm (0.35–0.39 in).[2] They weigh 5.6–8.7 g (0.20–0.31 oz). Their forearms are 30.8–34.2 mm (1.21–1.35 in) long.[4]


This species has a sperm storage mechanism, in which the females retains sperm in the isthmus of uterine tube after mating. All sperm not stored in the isthmus is rapidly metabolized by the enzymatic secretions of uterine epithelial cells. This species mates in autumn.[5] Females give birth in the summer. The average litter size is unknown, but twins have been observed. Hibernating individuals have been encountered hibernating November through March. Rock crevices appear to be important habitat for hibernation.[4]

Range and habitat

Of the bats that have been captured, most have been in the forest, creating the impression that it was totally dependent on forest for necessary habitat.[4][6] However, in 2006, an individual was found in a secondary forest in suburban Tokyo.[7] They have been found 100–1,500 m (330–4,920 ft) above sea level.[1]


It is listed as endangered by the IUCN. This designation is based on it meeting the following criteria: area of occupancy less than 500 km2 (190 sq mi), severely fragmented range, and ongoing decline in the extent and quality of its habitat.[1]


  1. ^ a b c d Maeda, K. 2008. Pipistrellus endoi. The IUCN Red List of Threatened Species 2008: e.T17340A7005575. https://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T17340A7005575.en. Downloaded on 30 August 2017.
  2. ^ a b Imaizumi, Y., 1959: A new bat of the Pipistrellus javanicus group from Japan. Bulletin of the National Science Museum Tokyo, no. 45: 363-371
  3. ^ Beolens, B., Watkins, M., & Grayson, M. (2009). The eponym dictionary of mammals. JHU Press.
  4. ^ a b c d KAWAI, K., ECHENIQUE-DÍAZ, L. M., TAKAHASHI, O., & SAITO, C. (2015). Insights into the Natural History of Pipistrellus endoi Imaizumi, 1959 from Survey Records in Miyagi Prefecture. 宮城教育大学環境教育研究紀要, 17, 53-57.
  5. ^ Son, S. W., MORI, T., YOON, M. H., & UCHIDA, T. A. (1988). Reproduction of two rare Pipistrellus species, with special attention to the fate of spermatozoa in their female genital tracts. Journal of the Mammalogical Society of Japan, 13(2), 77-91.
  6. ^ Kawai, K. 2009. Pipistrellus endoi Imaizumi, 1959. In: The Wild Mammals of Japan. Ohdachi, S.D., Ishibashi, Y., Iwasa, M.A. and Saitoh,T.(eds.). Shoukadoh, Kyoto, pp. 81-82
  7. ^ Kasahi, T., Urano, M., Ando, K. and Takamizu, Y. 2006. Spring roosts of the Endo's pipistrelle, Pipistrellus endoi, in Okutama region, central Japan. Animate, 6, 12-26.(in Japanese)

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