Nilssonia

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis: Sarcopterygii
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Cladus: Archelosauria
Division: Pan-Testudines
Division: Testudinata
Ordo: Testudines
Subordo: Cryptodira
Superfamilia: Trionychoidea

Familia: Trionychidae
Subfamilia: Trionychinae
Genus: Nilssonia
Species: N. formosa – N. gangetica – N. hurum – N. leithii – N. nigricans
Name

Nilssonia Gray 1872:332

Type Species:

Synonymy

Nilssonia Gray 1872:332
Isola Gray 1873:51
Aspideretes Hay 1904:274

References

Gemel, R., Praschag, P. 2003. On the nomenclature and vernacular names of recent Aspideretes species (Reptilia, Testudines, Trionychidae). Zoologische Abhandlungen - Staatliches Museum fur Tierkunde in Dresden 53(1):93-105.
Gray, J.E., 1872. Notes on the mud-tortoises of India (Trionyx, Geoffroy). Ann. Mag. Nat. Hist. (4)10:326-340.
Turtle Taxonomy Working Group (van Dijk, P.P., Iverson, J.B., Rhodin, A.G.J., Shaffer, H.B. & Bour, R.) 2014. Turtles of the world, 7th edition: annotated checklist of taxonomy, synonymy, distribution with maps, and conservation status. Chelonian Research Monographs 5(7):000.329–479 Reference page.

Vernacular names
English: Burmese Soft-shelled Turtle

Nilssonia is a genus of softshell turtles (family Trionychidae) from rivers, streams, ponds, and lakes in South Asia and Burma. In many treatments, it is monotypic, with the single species Burmese peacock softshell (N. formosa). However, the supposed other genus of peacock softshells, Aspideretes, is more closely related to N. formosa than had been believed. They differ only in the neural plates between the first pleural scale pair of the bony carapace, which are fused into one in N. formosa and unfused in the others.[5]

Thus, it has been proposed to unite the two genera under the older name, Nilssonia. As it seems, the closest living relatives of the Burmese peacock softshell are the Indian softshell turtle (A./N. gangeticus) and the Leith's softshell turtle (A./N. leithii), making the merging of the genera well warranted.[5][2]
Etymology

The generic name, Nilssonia, is in honor of Swedish zoologist Sven Nilsson.[6]
Species

If the genera are united, the five species are:

Nilssonia formosa (Gray, 1869) – Burmese peacock softshell, Burmese softshell turtle
Nilssonia gangetica (Cuvier, 1825) – Indian softshell turtle, Ganges softshell turtle
Nilssonia hurum (Gray, 1831) – Indian peacock softshell turtle
Nilssonia leithii (Gray, 1872) – Leith's softshell turtle, Nagpur softshell turtle
Nilssonia nigricans (Anderson, 1875) – black softshell turtle, Bostami turtle

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Nilssonia.
References

Gray, John Edward (1872). "Notes on the mud-tortoises of India (Trionyx, Geoffroy)". Annals and Magazine of Natural History, Fourth Series 10: 326–340.
Turtle Taxonomy Working Group [van Dijk PP, Iverson JB, Rhodin AGJ, Shaffer HB, Bour R] (2014). "Turtles of the world, 7th edition: annotated checklist of taxonomy, synonymy, distribution with maps, and conservation status". In: Rhodin AGJ, Pritchard PCH, van Dijk PP, Saumure RA, Buhlmann KA, Iverson JB, Mittermeier RA (editors) (2014). "Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group". Chelonian Research Monographs 5 (7): 000.329–479, doi:10.3854/ crm.5.000.checklist.v7.2014.
Gray, John Edward (1873). "Notes on mud-tortoises (Trionyx, Geoffroy), and on the skulls of the different kinds". Proceedings of the Zoological Society of London 1873: 38–72.
Hay, Oliver P. (1904). "On the existing genera of the Trionychidae". Proceedings of the American Philosophical Society 42: 268–274.
Praschag P, Hundsdörfer AK, Reza AHMA, Fritz U (2007). "Genetic evidence for wild-living Aspideretes nigricans and a molecular phylogeny of South Asian softshell turtles (Reptilia: Trionychidae: Aspideretes, Nilssonia)". Zool. Scripta 36 (4): 301–310. doi:10.1111/j.1463-6409.2007.00282.x (HTML abstract)
Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. xiii + 296 pp. ISBN 978-1-4214-0135-5. ("Nilsson", p. 191).