Three new species of Philippine forest mice (Apomys, Muridae, Mammalia), members of a clade endemic to Mindoro Island Author Heaney, Lawrence R. Field Museum of Natural History, 1400 S DuSable Lake Shore Drive, Chicago, IL 60605, USA Author Balete, Danilo S. Field Museum of Natural History, 1400 S DuSable Lake Shore Drive, Chicago, IL 60605, USA Author Duya, Mariano Roy M. Institute of Biology, University of the Philippines, Diliman, Quezon City 1101, PH Author Duya, Melizar V. Institute of Biology, University of the Philippines, Diliman, Quezon City 1101, PH Author Kyriazis, Christopher C. Field Museum of Natural History, 1400 S DuSable Lake Shore Drive, Chicago, IL 60605, USA & Department of Ecology & Evolutionary Biology, University of California, Los Angeles, CA 90095, USA Author Rickart, Eric A. Natural History Museum of Utah, 301 Wakara Way, Salt Lake City, UT 84108, USA Author Steppan, Scott J. Department of Biological Sciences, Florida State University, Tallahassee, FL 32306, USA Author Rowsey, Dakota M. Field Museum of Natural History, 1400 S DuSable Lake Shore Drive, Chicago, IL 60605, USA & Field Museum of Natural History, 1400 S DuSable Lake Shore Drive, Chicago, IL 60605, USA & Biology Department, Science Museum of Minnesota, St. Paul, MN 55102 USA text Zootaxa 2025 2025-06-12 5647 1 1 26 https://doi.org/10.11646/zootaxa.5647.1.1 journal article 311391 10.11646/zootaxa.5647.1.1 446bd330-e19b-453a-bad6-2b383f1e9e88 1175-5326 15819472 A4A82828-E075-4E2A-B17F-54EB7480F89B
TABLE 4. Mean ± 1 standard deviation of cranio-dental measurements of members of the Apomys gracilirostris species group. For A. veluzi sp. nov., A. crinitus sp. nov., and A. minor sp. nov., the first measurement (in parentheses) is that of the holotype. When n is less than the full sample, the reduced number is given in parentheses following the range. Measurements are defined in Methods.
Apomys gracilirostris n = 11Apomys veluzi n = 12Apomys crinitus n = 6Apomys minor n = 4
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Basi-occipital length (BOL)34.78 ± 0.65 33.83 – 36.11 (10)(31.86) 31.79 ± 0.46 31.28 – 33.01(30.98) 31.56 ± 0.54 30.98 – 32.38 (5)(30.44) 30.79 ± 0.54 30.44 – 31.59
Inter-orbital breadth (IB)6.03 ± 0.15 5.78 – 6.30(5.76) 5.56 ± 0.16 5.22 – 5.76(5.21) 5.43 ± 0.30 5.15 – 5.88(5.33) 5.42 ± 0.31 5.15 – 5.87
Zygomatic breadth (ZB)17.23 ± 0.45 16.43 – 17.80(16.43) 16.23 ± 0.37 15.48 – 16.76(16.01) 16.31 ± 0.84 15.60 – 17.87(15.44) 15.62 ± 0.18 15.44 – 15.79 (3)
Mastoid breadth (MB)14.86 ± 0.36 14.19 – 15.34(12.93) 12.54 ± 0.28 12.03 – 13.01(12.85) 12.83 ± 0.15 12.58 – 12.95 (5)(12.63) 12.58 ± 0.27 12.25 – 12.90
Nasal length (NL)14.33 ± 0.35 13.81 – 14.88(13.13) 13.09 ± 0.32 12.43 – 13.60(13.01) 13.1 ± 0.31 12.69 – 13.53 (5)(12.85) 12.86 ± 0.55 12.09 – 13.33
Length of incisive foramen (LIF)5.10 ± 0.26 4.69 – 5.50(4.60) 4.77 ± 0.30 4.33 – 5.14(5.56) 5.36 ± 0.23 4.94 – 5.57(5.36) 5.12 ± 0.23 4.85 – 5.36
Rostral depth (RD)6.92 ± 0.23 6.62 – 7.28(6.50) 6.62 ± 0.11 6.37 – 6.79(6.51) 6.66 ± 0.18 6.48 – 6.97(6.52) 6.49 ± 0.20 6.31 – 6.75
Rostral length (RL)15.84 ± 0.21 15.47 – 16.16(14.10) 14.41 ± 0.30 14.06 – 15.05(14.56) 14.41 ± 0.50 13.99 – 15.21 (5)(13.84) 13.98 ± 0.19 13.79 – 14.16
Oribio-temporal length (OL)10.96 ± 0.37 10.38 – 11.74 (10)(11.03) 10.52 ± 0.31 10.26 – 11.15(10.48) 10.63 ± 0.27 10.23 – 11.04(10.45) 10.69 ± 0.33 10.45 – 11.15
Uppper molar toothrow length (M1-M3)6.44 ± 0.16 6.27 – 6.79(6.37) 6.24 ± 0.21 5.94 – 6.58(6.13) 6.31 ± 0.15 6.13 – 6.50(6.12) 6.33 ± 0.15 6.12 – 6.47
Palatal breadth at M1 (PBM1)7.50 ± 0.26 7.16 – 7.87(6.91) 6.86 ± 0.18 6.59 – 7.19(6.87) 6.72 ± 0.13 6.56 – 6.87(6.73) 6.88 ± 0.16 6.73 – 7.40
Diastema length (DL)9.50 ± 0.22 9.27 – 9.92(8.82) 8.81 ± 0.23 8.44 – 9.19(8.87) 8.79 ± 0.34 8.40 – 9.31(8.29) 8.45 ± 0.19 8.29 – 8.70
Post-palatal length (PPL)11.85 ± 0.30 11.27 – 12.42 (10)(10.86) 10.95 ± 0.27 10.54 – 11.40(10.90) 11.01 ± 0.12 10.89 – 11.16 (5)(10.56) 10.65 ± 0.30 10.34 – 11.05
Labial breadth at M3 (LBM3)5.24 ± 0.22 4.93 – 5.65(5.17) 5.09 ± 0.19 4.80 – 5.45(4.52) 4.88 ± 0.23 4.52 – 5.22(5.01) 4.96 ± 0.23 4.62 – 5.12
Braincase height (BH)10.92 ± 0.23 10.45 – 11.24 (10)(9.65) 9.79 ± 0.19 9.48 – 10.05(10.34) 10.16 ± 0.26 9.70 – 10.34 (5)(10.13) 9.98 ± 0.19 9.79 – 10.16
Breadth of M1 (BM1)1.81 ± 0.07 1.71 – 1.94(1.63) 1.76 ± 0.11 1.61 – 1.96(1.69) 1.70 ± 0.07 1.60 – 1.80(1.66) 1.72 ± 0.08 1.66 – 1.84
Zygomatic plate (ZP)3.22 ± 0.10 3.06 – 3.37(2.74) 2.58 ± 0.13 2.43 – 2.81(2.70) 2.79 ± 0.19 2.56 – 3.01(2.62) 2.65 ± 0.04 2.62 – 2.69