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Fig. 12 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 12. Occlusal views of maxillary (left) and mandibular (right) molar rows in the paratype of Leptomys arfakensis (BMNH 29.5.27.22); adapted from Misonne (1969).

Fig. 20 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 20. Morphometric contrast (discriminant-function analysis performed on cranial and dental variables) between Leptomys ernstmayri and L. paulus showing projection of specimen scores on the first and second canonical variates extracted. See table 10. Symbol key: L. ernstmayri: from the Adelbert Range, hollow circles; Central Cordillera, solid circles; and the Huon Peninsula, half-solid circles; L. paulus, triangles. Arrow identifies score for single L. ernstmayri from the Foja Mountains, which was entered as an unknown in the analysis.

Fig. 16 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 16. Principal component analysis (performed on cranial and dental variables) showing dispersion along the first two principal components of specimen scores representing Leptomys of small body size. Species key: L. paulus, n. sp., from the Maneau Range, triangles; and L. ernstmayri from the Huon Peninsula, half-solid circles; Adelbert Range, hollow circles; Central Cordillera, solid circles; and Foja Mountains, solid circle signaled by arrow. The first axis is a measure of overall size (increasing from right to left), the second reflects shape. See table 8. Arrow pointing to a triangle indicates score representing the sole intact skull of L. paulus from the Astrolabe Range.

Fig. 10 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 10. Dorsal, ventral, and lateral views of cranium and dentary of BMNH 29.5.27.23 (holotype), an adult female Leptomys arfakensis, from the Arfak Mountains, 1000 m. Approximately X2.

Fig. 8 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 8. Lateral views of crania and left dentaries of same specimens illustrated in figure 7. Top: L. elegans. Middle: L. ernstmayri. Bottom: L. paulus (holotype). Approximately X2.

Fig. 11 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 11. Occlusal views of right maxillary (left pair) and mandibular (right pair) molar rows (X 20) drawn from juvenile examples of Leptomys. Left row in each pair is L. paulus (AMNH 158200), right row in each pair is L. ernstmayri (AMNH 194934). Maxillary rows: cusps are numbered according to Miller's (1912) scheme and referred to in the text with the prefix t; alc, anterolabial cingulum on second molar; pc, posterior cingulum. Mandibular rows: alab, anterolabial cusp; aling, anterolingual cusp; hd, hypoconid; md, metaconid; ed, entoconid; pc, posterior cingulum; pd, protoconid; plc, posterior labial cusplet. The basic pattern of cusps and cusplets seen here is common to all species of Leptomys. Two structures, however, reveal significant variation in their occurrence. Cusp t7 is absent from the second upper molar in our samples of L. paulus and L. arfakensis but generally present in samples of the other species (table 6). A conspicuous anterolabial cingulum (alc) on the second upper molar characterizes specimens of L. ernstmayri from the Huon Peninsula (and variably in samples of that species from elsewhere), but is generally lacking in the other species (table 6).

Fig. 21 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 21. Ratio diagram illustrating some proportional relationships in cranial and dental dimensions between samples of adult Leptomys. The standard is the AMNH sample of L. ernstmayri from the Huon Peninsula (N 5 11) contrasted with the AMNH sample of L. paulus from Mount Dayman (N 53). How the diagram was constructed and how to read it is explained in Materials and Procedures.

Fig. 6 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 6. Holotype of Leptomys arfakensis (BMNH 29.5.27.23), an adult female, from the Arfak Mountains, 1000 m. External measurements: LHB 5 151 mm, LTV 5 146 mm, LHF 5 36 mm, LE 5 21 mm. See table 1 for cranial and dental measurements.

Fig. 7 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 7. Dorsal (top) and ventral (bottom) views of adult crania contrasting three species of Leptomys. Left: L. elegans (Mount Dayman, 700 m, Maneau Range; AMNH 158204). Middle: L. ernstmayri (Mount. Rawlinson, 1370 m, Huon Peninsula; AMNH 194935). Right: L. paulus (Mount Dayman, 1370 m, Maneau Range; AMNH 158202, holotype). Approximately X2.

Fig. 9 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 9. Dorsal, ventral, and lateral views of cranium and dentary of AMNH 105793, an adult Leptomys signatus in the type series from the Fly River. Approximately X2.

Fig. 5 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 5. Left: Leptomys ernstmayri (AMNH 194931), an adult female from Gang Creek, 1340 m, east flank of Mount Rawlinson, Huon Peninsula. External measurements: LHB 5146 mm, LTV 5 166 mm, LHF 539 mm. Right: Holotype of Leptomys paulus (AMN 158202), an adult female from north slopes of Mount Dayman, 1370 m, in the Maneau Range. External measurements: LHB 5 127 mm, LTV 5 163 mm, LHF 5 36 mm, LE 5 21 mm. See table 1 for cranial and dental measurements.

Fig. 1 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 1. Diagram of the cranium of an adult Bunomys chrysocomus (from Sulawesi) showing limits of cranial and dental measurements. Abbreviations are explained in the text.

Fig. 3 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 3. Collection localities for specimens representing the Leptomys with smaller body size: L. ernstmayri (localities 11–21) and L. paulus (localities 22–24). Numerals refer to numbered localities in the gazetteer where locality information is provided and specimens are identified by museum acronyms and catalog numbers.

Fig. 4 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 4. Left: Leptomys elegans (AMNH 158204), an adult male from north slopes of Mount Dayman, 700 m, in the Maneau Range. External measurements: LHB 5 160 mm, LTV 5 164 mm, LHF 5 43 mm, LE 5 22 mm. Right: Holotype of Leptomys signatus (AMNH 105792), an adult female from north bank of the Fly River opposite Sturt Island. External measurements: LHB 5 144 mm, LTV 5 151 mm, LHF 538 mm, LE 5 19 mm. See table 1 for cranial and dental measurements.

Fig. 2 in Systematic Review of New Guinea Leptomys (Muridae, Murinae) with Descriptions of Two New Species

Fig. 2. Collection localities for specimens representing the Leptomys with larger body size: L. arfakensis (locality 1), L. signatus (localities 2–4), and L. elegans (localities 5–10). Numerals refer to numbered localities in the gazetteer where locality information is provided and specimens are identified by museum acronyms and catalog numbers.

Fig. 14 in Description of a New Genus and Species of Rodent (Murinae, Muridae, Rodentia) from the Tower Karst Region of Northeastern Vietnam

Fig. 14. Occlusal views of maxillary (left) and mandibular (right) molar rows from right side of the holotype of Tonkinomys daovantieni (CLM1-3 5 8.3 mm, CLm1-3 5 8.3 mm). See figure 13 for terminology of cusps and cusplets.

Fig. 10 in Description of a New Genus and Species of Rodent (Murinae, Muridae, Rodentia) from the Tower Karst Region of Northeastern Vietnam

Fig. 10. Holotype of Tonkinomys daovantieni. Dorsal (left) and ventral (right) views of cranium. Measurements are listed in table 1.

Fig. 13 in Description of a New Genus and Species of Rodent (Murinae, Muridae, Rodentia) from the Tower Karst Region of Northeastern Vietnam

Fig. 13. Diagram of maxillary (left) and mandibular (right) molar rows from right side of Bunomys chrysocomus illustrating structural terms. Maxillary molars: cusps are numbered according to Miller's (1912) scheme and referred to in the text with the prefix ''t''. Mandibular molars: a-lab, anterolabial cusp; a-ling, anterolingual cusp; alc, anterior labial cusplet; ed, entoconid; hd, hypoconid; md, metaconid; pc, posterior cingulum; pd, protoconid; plc, posterior labial cusplet.

Fig. 9 in Description of a New Genus and Species of Rodent (Murinae, Muridae, Rodentia) from the Tower Karst Region of Northeastern Vietnam

Fig. 9. Plantar views of left hind feet of adults of Indomalayan murines in the Dacnomys division. A, Chiromyscus chiropus (AMNH 268333, southern Vietnam). B, Niviventer langbianis (AMNH 272251, northern Vietnam). C, N. fulvescens (AMNH 272376, northern Vietnam). D, Saxatilomys paulinae (BMNH 2000.292, Lao PDR). The feet of the arboreal C. chiropus and N. langbianis are short and adorned with large and bulbous plantar pads compared with the longer foot and relatively smaller pads in the terrestrial/ scansorial N. fulvescens. The four interdigital pads (at the bases of the digits), thenar (t), and hypothenar (h) of S. paulinae are set appreciably closer than in any of the other species, are more swollen, and larger, not only absolutely but relative to plantar surface, an overall plantar adornment resembling that exhibited by Tonkinomys daovantieni (fig. 8).

Fig. 7 in Description of a New Genus and Species of Rodent (Murinae, Muridae, Rodentia) from the Tower Karst Region of Northeastern Vietnam

Fig. 7. Holotype of Tonkinomys daovantieni. Top: Lateral view of left hind foot. Bottom: Lateral view of left front foot. The bulbous palmar and planter pads are clearly evident.