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Fig. 15. Upper, A in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 15. Upper, A fragmentary mandible showing replacement of lower premolars of Rhombomylus (IVPP V7588); Lower, crosssection of m1 and m2 of Rhombomylus showing the roots and pulp cavity.
Fig. 37 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 37. Stereoscopic view of the lateral aspect of the ear region of Rhombomylus (IVPP V5263). The bulla was broken.
Fig. 42 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 42. Cross (coronal) sections through the rostrum of Rhombomylus (IVPP V7488), showing internal structures of the nasal cavity. The sequence of sections is indicated in the figure at the lower right corner (the specimen is not the one that was cut). Among a total of 38 sections, only 25 are illustrated. The number between brackets indicates the original position in the cutting sequence. et, ethmoturbinals; fol, fossa for olfactory lobe; fpv, footplate of vomer; mns, median nasal septum; and tl, transverse lamina. See text for discussion.
Fig. 46 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 46. Cross sections of the braincase and basicranium of Rhombomylus (IVPP V5266). The cutting sequence of the sections is shown in the figure at the lower right corner. Twentyfour sections out of 33 slides are illustrated. at, atlas; boc, basioccipital; bs, basisphenoid; coc, cochlear canal; da, dens of axis; ms, mastoid of petrosal; occ, occipital condyle; pa, parietal; saf, subarcuate fossa; and sq, squamosal.
Fig. 8 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 8. Premolars of Rhombomylus. A–C, Occlusal, lingual, and labial views of the left upper P3 and P4 (IVPP V7534); D–F, occlusal, lingual, and labial views of the right lower p3 and p4 (IVPP V7587.1).
Fig. 36 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 36. Stereoscopic view of ventral basicranial and middle ear regions of Rhombomylus (IVPP V7586). The ectotympanic bulla was broken.
Fig. 7 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 7. Deciduous premolars of Rhombomylus (IVPP V7885). A–C, Occlusal, labial, and lingual views of the right dP3 and dP4; D–F, occlusal, lingual, and labial views of the right dp3 and dp4.
Fig. 6 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 6. Upper and lower incisors of Rhombomylus (IVPP V5288). A–C, Anterior, posterior, and lateral views of the right upper incisor (V5288); D, medial view of a fragmentary mandible showing the end of the lower incisor in the dentary; E–G, dorsal, lateral, and medial views of the left incisor (V5288). Scale bar for all except D.
Fig. 5 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 5. Measurements of jaw muscle moment arms and resistance arms of the incisor and molar in Rhombomylus and other mammals. dl, Dental (molar) length; ml, mandibular length; mma, moment arm of the anteriormost fiber of the anterior deep masseter; mmv, moment arm of the ventralmost fibers of the superficial masseter; mt, moment arm of the dorsalmost fibers of the temporalis rai, resistance arm of the incisor; and ram, resistance arm of the molar. Measurements were made between the landmarks using an UltraCal Mark III caliper. The results are provided in appendix 4.
Fig. 20 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 20. Enamel microstructures of left upper molars of Rhombomylus (IVPP V7490), corresponding to sections labeled in figure 19. See text for description and discussion.
Fig. 4 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 4. Skull measurements of Rhombomylus. dbm, Distance between molar rows (between M1s); iid, interinfraorbital distance; iod, interorbital distance; lld, length of the lower diastema; lud, length of the upper diastema; mh, mandibular height (at m1); sh, skull height; sl, skull length; wbs, width between squamosal edges; and wnr, width of the narrowest region of the skull roof.
Fig. 28 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 28. Lateral views of skulls of Rhombomylus. Skulls are in relative ages from the youngest to oldest (IVPP V7585, V5280, V5288, V5289, V5293, V5278).
Fig. 11 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 11. Comparison of M1 (squares)/m1 (triangles) sizes of Matutinia and Rhombomylus. Solid symbols represent M1/m1 of Rhombomylus; empty ones are those of Matutinia. Measurements of Matutinia are from Ting et al. (2002).
Fig. 3 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 3. Measured dimensions of the upper molar, upper premolar, lower molar, and lower premolar of Rhombomylus. ML, upper molar length; mL, lower molar length; PL, upper premolar length; pL, lower premolar length; PW, upper premolar width; pW, lower premolar width; TlW, upper molar talon width; tlW, lower molar talonid width; TrW, upper molar trigon width; and trW, lower molar trigonid width.
Fig. 2. A in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 2. A. Location and geological map of the Xichuan (Liquanqiao) Basin (1, Neogene; 2, Hetaoyuan Fm.; 3, Dacangfang Fm.; 4, Yuhuangding Fm.; 5, Hugang Fm.; 6, stratigraphical boundary; and 7, Dajian fossil localities). B. Section measured between Daao and Pangwan (K2h, Hugang Fm; E2y, Yuhuangding Fm.; E2d, Dacangfang Fm.). Modified from Xu et al. (1979) and D.E. Russell and Zhai (1987).
Fig. 10 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 10. Cheek teeth of Matutinia (IVPP V7442, V7443). A–B, Occlusal and lingual views of P3– M3; C–D, occlusal and lingual views of p3–m3. Images photographically reversed to facilitate comparison with those of Rhombomylus. Modified from Ting et al. (2002).
Fig. 30 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 30. Ventral views of the rostra of Rhombomylus (IVPP V5278, V5293, V5289, V5280, V7585), showing the conditions of the incisive foramen, premaxillamaxillar suture, and shape of the diastema in individuals of different ages.
Fig. 40 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 40. Peeled petrosal showing casts of the inner ear of Rhombomylus (IVPP V5265, V7494). aa, anterior ampulla; asc, anterior semicircular canal; cc, crus commune; fc, fenestra cochleae; fv, fenestra vestibuli; iam, internal acoustic meatus; la, lateral ampulla; lsc, lateral semicircular canal; pa, posterior ampulla; pm, promontorium; psc, posterior semicircular canal; and saf, subarcuate fossa.
Fig. 18 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 18. Enamel distribution and microstructure of a lower incisor from a juvenile individual of Rhombomylus (IVPP V5280), in which deciduous premolars are present and germs of M3/m3 are completely embedded in bones. A, Distribution of the enamel on the labial surface of the incisor; B–C, cross and longitudinal sections showing microstructure of the enamel. See text for description and discussion.
Fig. 1 in The Osteology Of Rhombomylus (Mammalia, Glires): Implications For Phylogeny And Evolution Of Glires
Fig. 1. Phylogenetic hypotheses of basal Glires and the phylogenetic position of Rhombomylus, based on Meng et al. (1994), Averianov (1994), Li et al. (1987), Dashzeveg et al. (1998), and Meng and Wyss (2001).
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