Vertebrata Palasiatica ›› 2024, Vol. 62 ›› Issue (1): 13-32.DOI: 10.19615/j.cnki.2096-9899.231013
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WANG Wei1, LEI Hong2, LI Chun1,*()
Received:
2023-08-10
Online:
2024-01-20
Published:
2024-01-17
Contact:
* lichun@ivpp.ac.cn通讯作者:
* lichun@ivpp.ac.cn基金资助:
CLC Number:
WANG Wei, LEI Hong, LI Chun. A small-sized dinocephalosaurid archosauromorph from the Middle Triassic of Yunnan, southwestern China. Vertebrata Palasiatica, 2024, 62(1): 13-32.
王维, 雷洪, 李淳. 2024, 62(1): 13-32, 云南中三叠世一恐头龙科小型主龙型类. 古脊椎动物学报.
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URL: https://www.vertpala.ac.cn/EN/10.19615/j.cnki.2096-9899.231013
Fig. 1 Holotype of Austronaga minuta (IVPP V18579) discovered from Luoping, Yunnan, China, with the skull, anterior cervical vertebrae, and most of the caudal vertebrae preserved on a block
Fig. 2 Skull and anterior cervical vertebrae (A) with interpretative line drawings (B, C) of the holotype of Austronaga minuta (IVPP V18579) from the Middle Triassic in Luoping, Yunnan, China Abbreviations: an. angular; ar. articular; atic. atlas intercentrum; atpl. atlas pleurocentrum; atn. atlas neural arch; ax. axis (pleurocentrum); axic. axis intercentrum; axn. axis neural spine; bo. basioccipital; cop. coronoid process; cr(3-5). (third to fifth) cervical rib; crat. cervical rib of atlas; crax. cervical rib of axis; cv(3-6). (third to sixth) cervical vertebrae (centra); cv(3-5)n. (third to fifth) cervical vertebral neural arches; d. dentary; ept. ectopterygoid; f. frontal; ipv. interpterygoid vacuity; j. jugal; la. lacrimal; m. maxilla; mte. maxillary teeth; n. nasal; p. parietal; pbs. parabasisphenoid; pfor. parietal foramen; pl. palatine; pm. premaxilla; po. postorbital; prf. prefrontal; pt. pterygoid; q. quadrate; rap. retroarticular process; so. supraoccipital; sq. squamosal; sran. surangular
Item | Length | Item | Length (centrum) | Height at midpoint | |
---|---|---|---|---|---|
Skull | 47.5 | Atlas | - | - | |
Snout | 24.1 | Axis | 3.1* | 6.4 | |
Orbit approximately length | 15.9 | Cervical V3 | 6.1 | 5.6 | |
Temporal region | 7.5 | Cervical V4 | 9.0 | 5.1 | |
Mandible | 46.6 | Cervical V5 | 10.4 | 5.0 |
Table 1 Measurements of the holotype of Austronaga minuta (IVPP V18579) from the Middle Triassic in Luoping, Yunnan, China (mm)
Item | Length | Item | Length (centrum) | Height at midpoint | |
---|---|---|---|---|---|
Skull | 47.5 | Atlas | - | - | |
Snout | 24.1 | Axis | 3.1* | 6.4 | |
Orbit approximately length | 15.9 | Cervical V3 | 6.1 | 5.6 | |
Temporal region | 7.5 | Cervical V4 | 9.0 | 5.1 | |
Mandible | 46.6 | Cervical V5 | 10.4 | 5.0 |
Fig. 3 Middle region of the tail (A) with interpretative line drawings (B) of representative caudal vertebrae in the holotype of Austronaga minuta (IVPP V18579) from the Middle Triassic in Luoping, Yunnan, China Abbreviations: cav. caudal vertebra (centrum); cavn. caudal vertebral neural arch; ch. chevron
Fig. 4 Phylogenetic results showing the position of Austronaga minuta in Dinocephalosauridae and other relationships within Archosauromorpha A. strict consensus tree; B. majority-rule reduced consensus trees(nodes with bootstrap proportion > 50% remained with values labeled above)
char. 1-50 | 11?30?1111 | ??[0/1]0000??? | ?0?0000-01 | 11002?0000 | ???0?00001 |
char. 51-100 | ???00????? | ??????0?1? | ?0?1??0??? | ?????????1 | 0?????-??1 |
char. 101-150 | -------?1? | ?????????? | ?????????? | ?????????? | ???000?1?0 |
char. 151-200 | ?01?10?11? | 01100001[0/4]0 | 00010?1220 | 21??210211 | 1?00????2[1/2] |
char. 201-250 | ?????????? | ?????????? | ?03??????? | ?????????? | ?????????? |
Appendix Scores of character states for the holotype of Austronaga minuta
char. 1-50 | 11?30?1111 | ??[0/1]0000??? | ?0?0000-01 | 11002?0000 | ???0?00001 |
char. 51-100 | ???00????? | ??????0?1? | ?0?1??0??? | ?????????1 | 0?????-??1 |
char. 101-150 | -------?1? | ?????????? | ?????????? | ?????????? | ???000?1?0 |
char. 151-200 | ?01?10?11? | 01100001[0/4]0 | 00010?1220 | 21??210211 | 1?00????2[1/2] |
char. 201-250 | ?????????? | ?????????? | ?03??????? | ?????????? | ?????????? |
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