Fig 1.
Photographs of the upper and lower ponds showing the high-altitude mountain pond and stream environments inhabited by Batrachuperus yenyuanensis at the type locality Shuangertang, near Yanyuan, Liangshan Yi Autonomous Prefecture, Sichuan Province, Southwest China.
A, upper pond; B, lower pond (both looking to the west; photograph by J Jia).
Fig 2.
Photographs of representative formaldehyde-preserved specimens of Batrachuperus yenyuanensis in dorsal view.
A, CIB 14308 from the type locality Shuangertang, Yanyuan County; B, CIB 14550 from Maoniudui, Dechang County; C, CIB 17005 from Shenguozhuang, Yuexi County; D, CIB 72599 from Tuowu, Mianning County.
Fig 3.
Micro-CT rendered reconstruction of the skull of Batrachuperus yenyuanensis in dorsal view.
A, CIB 72599 from Tuowu, Mianning County; B, FMNH 49371, paratype specimen from the type locality Shuangertang, Yanyuan County; C, CIB 17308 from Shuangertang, Yanyuan County.
Fig 4.
Micro-CT rendered reconstruction of the skull of Batrachuperus yenyuanensis in left lateral and occipital views.
A, D, CIB 72599 from Tuowu, Mianning County; B, E, FMNH 49371, paratype specimen from Shuangertang, Yanyuan County; C, F, CIB 17308 from Shuangertang, Yanyuan County.
Fig 5.
Micro-CT rendered reconstruction of the skull of Batrachuperus yenyuanensis in palatal view.
A, CIB 72599 from Tuowu, Mianning County; B, FMNH 49371, paratype specimen from Shuangertang, Yanyuan County; C, CIB 17308 from Shuangertang, Yanyuan County.
Fig 6.
Micro-CT rendered reconstruction of the mandible of Batrachuperus yenyuanensis.
A, right mandible in lateral view; B, right mandible in medial view; C, mandibular arch in dorsal view; D, mandibular arch in ventral view. FMNH 49371, paratype specimen, from Shuangertang, Yanyuan County.
Fig 7.
Hyobranchial apparatus of Batrachuperus yenyuanensis in dorsal view.
A, CIB 201707YY04 (juvenile); B, CIB 201707YY09 (subadult); C, CIB 201707YY08 (adult). All three specimens from Shuangertang, Yanyuan County.
Fig 8.
Micro-CT rendered reconstructions of the whole body skeleton of Batrachuperus yenyuanensis.
A, B, CIB 17308 in dorsal (A) and ventral (B) views; C, D, CIB 72599 in dorsal (C) and ventral (D) views. CIB 17308 from Shuangertang, Yanyuan County; CIB 72599 from Tuowu, Mianning County.
Fig 9.
Micro-CT rendered reconstructions of the pectoral girdle and upper arm of Batrachuperus yenyuanensis.
Left scapulocoracoid of CIB 94631 (A, E), CIB 16999 (B, F), CIB 17308 (C, G), CIB 72599 (D, H) in lateral (upper row) and ventrolateral (middle row) views; left humerus of CIB 94631 (I, J), CIB 17308 (M, N), CIB 72599 (O, P) and right humerus of CIB 16999 (K, L) in lateral (left) and medial (right) views. CIB 16999 from Shenguozhuang, Yuexi County; CIB 17308 from Shuangertang, Yanyuan County; CIB 72599 from Tuowu, Mianning County; CIB 94631 from Xieka, Jiulong County.
Fig 10.
Micro-CT rendered reconstructions of the forearm and manus of Batrachuperus yenyuanensis.
Left forearm and manus of CIB 94631(A), CIB 17313 (B), CIB 72596 (D) in lateral view; right forearm and manus of FMNH 49371 (C) and CIB 17308 (E) in dorsal and lateral views; right forearm and manus of CIB 17308 in ventral and medial views (F). FMNH 49371, CIB 17308 and CIB 17313 from Shuangertang, Yanyuan County; CIB 72596 from Tuowu, Mianning County; CIB 94631 from Xieka, Jiulong County.
Fig 11.
Micro-CT rendered reconstructions of the pelvic girdle of Batrachuperus yenyuanensis in dorsal (left column), ventral (middle column) and left lateral (right column) views.
CIB 14514 (A–C), CIB 16999 (D–F), CIB 17302 (G–I), CIB 17307 (J–L) and CIB 72592 (M–O). Note partly ossified pubis in CIB 14514 (A–C), CIB 17302 (G–I), and CIB 72592 (M–O). CIB 14514 from Maoniudui, Dechang County; CIB 16999 from Shenguozhuang, Yuexi County; CIB 17302 and CIB 17307 from Shuangertang, Yanyuan County; CIB 72592 from Tuowu, Mianning County.
Fig 12.
Micro-CT rendered reconstructions of the ypsiloid cartilage and femur of Batrachuperus yenyuanensis.
Ypsiloid cartilage in dorsal view in CIB 201707YY04 (A), CIB 201707YY08 (B), CIB 201707YY09 (C); right femur of CIB 14514 (D, E), CIB 16999 (F, G), CIB 17308 (H, I) and CIB 94632 (J, K) in dorsal (left) and ventral (right) views. CIB 14514 from Maoniudui, Dechang County; CIB 16999 from Shenguozhuang, Yuexi County; CIB 17308, 201707YY04, 201707YY08 and 201707YY09 from Shuangertang, Yanyuan County; CIB 94632 from Xieka, Jiulong County.
Fig 13.
Micro-CT rendered reconstructions of the lower hindlimb and pes of Batrachuperus yenyuanensis.
Left lower hindlimb of CIB 17309 (A), CIB 17313 (B), FMNH 49371 (C) and CIB 72597 (E); right lower hindlimb of CIB 14514 (D) and FMNH 49371 (F). Note the preaxial elements (tibiale and/or element y) are delayed in ossification in CIB 17309 and CIB17313; the two centralia are fused in CIB 14514 but remain separated from each other in all other specimens; the postminimus is ossified in FMNH 49371, CIB 14514 and CIB 72597. CIB 14514 from Maoniudui, Dechang County; CIB 17309, 17313, and FMNH 49371 from Shuangertang, Yanyuan County; CIB 72597 from Tuowu, Mianning County.
Fig 14.
Patterns of geographic distribution of Batrachuperus yenyuanensis in western Sichuan Province of China.
Note that localities (solid dots) are spread on both the west and east side of the Yalong River (see S1 Table for altitude information of the localities). Small circles denote county towns and large circles denote city towns in the study area.