Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Infraclassis: Placentalia
Cladus: Boreoeutheria
Superordo: Euarchontoglires
Ordo: Rodentia
Subordo: Myomorpha
Superfamilia: Muroidea
Familia: Muridae
Subfamilia: Murinae
Tribus: Hydromyini
Genus: Chrotomys
Species (5):C. gonzalesi - C. mindorensis - C. sibuyanensis - C. silaceus - C. whiteheadi
Name
Chrotomys Thomas, 1895: 161
Type species: Chrotomys whiteheadi Thomas, 1895, by monotypy.
Synonyms
Celaenomys Thomas, 1898: 390
Type species: Xeromys silaceus Thomas, 1895, by original designation and monotypy.
References
Primary references
Thomas, O. 1895. Preliminary diagnoses of new mammals from Northern Luzon, collected by Mr. John Whitehead. Annals and Magazine of Natural History. Series 6 16: 160–164. BHL
Thomas, O. 1898. On the mammals obtained by Mr. John Whitehead during his recent expedition to the Philippines. Transactions of The Zoological Society of London 14: 377–412. BHL
Additional references
Musser, G.G., Gordon, L.K. & Sommer, H. 1982. Species-Limits in the Philippine Murid, Chrotomys. Journal of Mammalogy 63(3): 515–521. DOI: 10.2307/1380457 Paywall Reference page.
Rickart, E.A. & Heaney, L.R. 1991. A new species of Chrotomys (Muridae) from Luzon Island, Philippines. Proceedings of the Biological Society of Washington 104(2): 387–398. BHL Reference page.
Musser, G.G. & Heaney, L.R. 1992. Philippine rodents: definitions of Tarsomys and Limnomys plus a preliminary assessment of phylogenetic patterns among native Philippine murines (Murinae, Muridae). Bulletin of the American Museum of Natural History 211: 1–138. hdl: 2246/906 Open access Reference page.
Rickart, E.A., Heaney, L.R., Goodman, S.M. & Jansa, S. 2005. Review of the Philippine Genera Chrotomys and Celaenomys (Murinae) and Description of a New Species. Journal of Mammalogy 86(2): 415–428. DOI: 10.1644/BEL-124.1 Open access Reference page.
Vernacular names
English: Philippine Shrew-rats
The genus Chrotomys contain a unique group of rodents found only in the Philippines, specifically the islands of Luzon, Mindoro, and Sibuyan. Instead of being predominantly herbivorous or omnivorous like other murines, these rats feed predominantly on invertebrates although they do eat some vegetable matter. This vermivory is probably the result of a rat-like animal moving into an ecological niche usually filled by shrews. Shrews and other insectivores are absent on these Philippine islands.
Taxonomy
Rickart et al. (2005) found that C. mindorensis, C. whiteheadi, and C. gonzalesi are closely related whereas C. silaceus and C. sibuyanensis represent earlier offshoots of the genus. Several authors place C. silaceus in the genus Celaenomys, but Rickart et al. (2005) suggest that neither genetic nor morphometric distance warrant it.
These rats are considered "old endemics" and are probably the result of one of the first colonisations of the Philippine islands. Other murines colonised the islands at a later time and are more closely related to mainland murines.
Species
Genus Chrotomys - Luzon striped rats
Luzon striped rat, Chrotomys whiteheadi
Mindoro striped rat, Chrotomys mindorensis
Isarog striped shrew-rat, Chrotomys gonzalesi
Blazed Luzon shrew-rat, Chrotomys silaceus
Sibuyan striped shrew-rat, Chrotomys sibuyanensis
Relationships as inferred by cytochrome b
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Relationships as inferred by morphology
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References
Nowak, R.M. 1999. Walker's Mammals of the World, Vol. 2. Johns Hopkins University Press, London.
Rickart, E. A., L. R. Heaney, S. M. Goodman, and S. Jansa. 2005. Review of the Philippine genera Chrotomys and Celaenomys (Murinae) and description of a new species. Journal of Mammalogy, 86:415-428.
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