taxonID	type	description	language	source
FC0C7239C015FF93FF00FA5EBBDD9897.taxon	description	https: // zoobank. org / urn: lsid: zoobank. org: act: 5 C 584 DF 1 - CE 21 - 4 A 7 A- 9 DAD- 09 EC 5 D 69673 C (Table 1; Figure 4, 5, and 6)	en	Dwijayanti, Endah, Maryanto, Ibnu, Achmadi, Anang Setiawan, Wiantoro, Sigit, Dharmayanthi, Anik Budhi, Kurnianingsih, Maharadatunkamsi (2025): Description of a New Species of Rattus (Rodentia: Muridae) from East Borneo, Indonesia. Ecologica Montenegrina 88: 49-62, DOI: 10.37828/em.2025.88.5, URL: https://doi.org/10.37828/em.2025.88.5
FC0C7239C015FF93FF00FA5EBBDD9897.taxon	materials_examined	Holotype Museum Zoologicum Bogoriense MZB 29119 (Field No. MW 298), adult female, weight 68 grams, head body length 128.48 mm, tail length 148.40 mm, ear length 18.35 mm, hind foot length 30.43 mm; skull removed, carcass fixed in 10 percent formalin and preserved in 70 percent ethanol. Skin dried and stuffed after fixing in formalin. Collected by Maryanto and Achmadi on 22 May 2006. Type locality Intu Lingau village, Melak district, Kutai Barat regency, East Kalimantan, Borneo, Indonesia (00 ° 18 ' 07.04 " S, 115 ° 50 ' 04.08 " E). The habitat was a selective logged dipterocarp forest on waterlogged, periodically inundated sandy clay. Paratypes (Listed in Appendix 1) All paratypes are from Borneo with locality detailed as follows: MZB 29118, adult male, collected 22 May 2006 (00 o 18 ’ 13.02 ” S, 115 o 50 ’ 06.09 ” E); MZB 29123, adult female, collected 24 May 2006 (00 o 18 ’ 07.04 ” S, 115 o 50 ’ 04.08 ” E); MZB 29121, adult female, collected 23 May 2006; MZB 29124, adult male, collected 24 May 2006 (00 o 18 ’ 07.02 ” S, 115 o 50 ’ 03.08 ” E). All of these specimens were collected in selectively logged dipterocarp forests on waterlogged, periodically inundated sandy clay in Intu Lingau village, Melak district, regency of Kutai Barat, East Kalimantan; and MZB 29117, young adult male, collected 29 May 2006 from Dempar village, Melak district, regency of Kutai Barat, East Kalimantan at secondary regrowth forest in the border between medium brown clay forest and swamp forest (00 o 22 ’ 30.05 ” S, 115 o 30 ’ 42.08 ” E). All specimens were collected by Ibnu Maryanto and Anang S. Achmadi. All specimens were initially fixed in 10 % formalin. Skins were later removed and preserved dry, and skulls were cleaned by hand.	en	Dwijayanti, Endah, Maryanto, Ibnu, Achmadi, Anang Setiawan, Wiantoro, Sigit, Dharmayanthi, Anik Budhi, Kurnianingsih, Maharadatunkamsi (2025): Description of a New Species of Rattus (Rodentia: Muridae) from East Borneo, Indonesia. Ecologica Montenegrina 88: 49-62, DOI: 10.37828/em.2025.88.5, URL: https://doi.org/10.37828/em.2025.88.5
FC0C7239C015FF93FF00FA5EBBDD9897.taxon	biology_ecology	Habitat The holotype was collected from the western Mahakam River, East Kalimantan, Borneo, in the area of Empakuq and Dempar, from a selectively logged dipterocarp forest on brown clay and logged forest on waterlogged sandy clay, which was periodically inundated. Four paratypes of R. radityaniae sp. nov. were collected from Empakuq and one from a regrowth forest on medium brown clay at Dempar village. So far, there is no record of R. radityaniae sp. nov. from other places in Borneo, but it probably occurs more broadly. Other murinae species that occurred in the same area were R. tanezumi, Maxomys tajuddinii, M. whiteheadi (O. Thomas, 1894), Niviventer cremoriventer (G. S. Miller, 1900), and Sundamys muelleri (Jentink, 1880).	en	Dwijayanti, Endah, Maryanto, Ibnu, Achmadi, Anang Setiawan, Wiantoro, Sigit, Dharmayanthi, Anik Budhi, Kurnianingsih, Maharadatunkamsi (2025): Description of a New Species of Rattus (Rodentia: Muridae) from East Borneo, Indonesia. Ecologica Montenegrina 88: 49-62, DOI: 10.37828/em.2025.88.5, URL: https://doi.org/10.37828/em.2025.88.5
FC0C7239C015FF93FF00FA5EBBDD9897.taxon	diagnosis	Diagnosis Rattus radityaniae sp. nov. has a medium body size, with a head and body length ranging from 107.86 to 132.09 mm, a tail length of 133.00 to 148.40 mm, a hind foot length of 25.95 to 30.43 mm, an ear length of 16.58 to 18.35 mm, and a weight of 48 to 78 g (Table 1). Its hair is soft and dense, featuring sharp and long guard hairs typical of Rattus species, covering the upper parts. The dorsal hairs are grey at the base, transitioning to orange-brown in the middle, with black tips. The underparts of fresh specimens exhibit a creamy to yellowish pelage, with a sharp demarcation between the dorsal and ventral colors along the flank. In museum specimens, the belly fur tends to appear pale buff with grey bases. The tail is unicolored and dark, extending beyond the length of the head and body (TL / HBL ratio of 106.99 % to 137.00 %). The tail scales of Rattus radityaniae sp. nov. comprise 12 – 13 rings per cm at the mid-section. This new species has a mammae formula of four pairs (2 + 2 = 8), including two pectoral and two abdominal pairs of teats. An examination of the upper incisors in Rattus radityaniae sp. nov. revealed a distinct morphology characterized by large, long, and strongly curved opisthodont incisors.	en	Dwijayanti, Endah, Maryanto, Ibnu, Achmadi, Anang Setiawan, Wiantoro, Sigit, Dharmayanthi, Anik Budhi, Kurnianingsih, Maharadatunkamsi (2025): Description of a New Species of Rattus (Rodentia: Muridae) from East Borneo, Indonesia. Ecologica Montenegrina 88: 49-62, DOI: 10.37828/em.2025.88.5, URL: https://doi.org/10.37828/em.2025.88.5
FC0C7239C015FF93FF00FA5EBBDD9897.taxon	etymology	Etymology The new species is named after Fitri Afina Radityani, Ibnu Maryanto’s daughter, in recognition of her understanding when her father was frequently away from home doing expeditions.	en	Dwijayanti, Endah, Maryanto, Ibnu, Achmadi, Anang Setiawan, Wiantoro, Sigit, Dharmayanthi, Anik Budhi, Kurnianingsih, Maharadatunkamsi (2025): Description of a New Species of Rattus (Rodentia: Muridae) from East Borneo, Indonesia. Ecologica Montenegrina 88: 49-62, DOI: 10.37828/em.2025.88.5, URL: https://doi.org/10.37828/em.2025.88.5
