Musseromys anacuao, Heaney & Balete & Rickart & Veluz & Jansa, 2014

Heaney, Lawrence R., Balete, Danilo S., Rickart, Eric A., Veluz, Maria Josefa & Jansa, Sharon A., 2014, Three New Species of Musseromys (Muridae, Rodentia), the Endemic Philippine Tree Mouse from Luzon Island, American Museum Novitates 2014 (3802), pp. 1-1 : 1-

Musseromys anacuao , new species

Figures 2 , 3 , 4D, 5D, 6D, 10; tables 2, 3

HOLOTYPE: FMNH 209522 , adult female collected on 1 May 2010, field number D. S. Balete 7267. Fresh tissues were removed from the thigh and placed in DMSO buffer solution. The rest of the specimen was initially fixed in formalin, now preserved in ethyl alcohol with skull (fig. 6D) removed and cleaned. The dorsoposterior portion of the braincase was damaged by the trap; the specimen is otherwise in good condition. The holotype is currently housed at FMNH but will be transferred to PNM.

TYPE LOCALITY: Philippines: Luzon Island: Aurora Province: Dinalungan Municipality , 0.2 km E Mt. Anacuao peak, 1725 m elevation, 16.25527° N, 121.88896° E (fig. 1) .

MEASUREMENTS: Tables 2 and 3.

SPECIMENS EXAMINED (n = 3). Aurora Province: Dinalungan Municipality , 0.2 km E Mt. Anacuao peak, 1725 m elevation ( FMNH 209522 [holotype], 209523, 209524) .

ETYMOLOGY: From the name of the mountain where the specimens were obtained, used as a noun in the genitive case.

DIAGNOSIS: A member of the genus Musseromys (see Emended Diagnosis and Description, above), of smaller than average size (fig. 10; HBL 74−83 mm) with a moderately long tail (82−86 mm, 99−116% of HBL), hind foot of average length (18 mm) relative to body size (19%−23% of HBL), and moderately short ears (15−16 mm; table 3). The hind foot is broad with proportionately large plantar pads (fig. 4D). The skull (fig. 6D) is small (20.0− 20.7 mm), with broad lingual breadth of palate at M3 but narrow labial palatal breadth at M1, narrow zygomatic plates, short molar rows and narrow M1, and short nasals and rostrum. The incisive foramina are long, relatively wide, and terminate posteriorly slightly anterior to the anterior

Figures

FIG. 2. Projection of specimen scores onto the first two axes (A) and the second and third axes (B) of a principal components analysis (table 1) of 18 craniodental variables (log-10 transformed) from seven specimens representing four putative species of Musseromys.

FIG. 3. The tree resulting from a maximum-likelihood analysis of the cytochrome b gene from Phloeomys Division species under the best-fitting model (GTR+I+Γ4). Numbers at nodes indicate maximum-likelihood (above the line) bootstrap support. Terminal taxa are identified by species name and a unique alphanumeric identifier (either FMNH catalog number or Genbank accession number). Trees are rooted with Rattus norvegicus (Genbank number X14848) and with three species of gerbil: Meriones unguiculatus (AF119264), Gerbillus nigeriae (AJ430555), and Gerbilliscus guineae (AJ430562) as outgroups (not shown). Black and gray branches indicate elevational range reconstructed using parsimony optimization (see Molecular Genetic Methods), where black and grey indicate lowland and montane distributions, respectively.