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Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution

Luo, Z.-X.; Gatesy, S.M.; Jenkins, F.A. Jr.; Amaral, W.W.; Shubin, N.H.

Year2015
Source roleprimary-study
DOI / ID10.1073/pnas.1519387112

Fitness and scope

topology · morphology · range · methods · taxonomy · biogeography · ecology

The CT, dental-wear and phylogenetic study uses MCZ7/95A–B and MCZ10/G95; its character data are archived as MorphoBank Project 2292.

Claim ledger

topology · medium

CT anatomy and dental wear from MCZ7/95A–B and MCZ10/G95 informed a rescored matrix that placed Late Triassic haramiyids outside crown Mammalia, while the postdentary trough supports rather than directly preserves a mandibular middle ear.

claim:event:haramiyavia-ct-crown-boundary
taxonomy · medium

Named Haramiyavia jaws were rescored in a published morphology matrix that placed sampled Late Triassic haramiyids outside crown Mammalia; the result is matrix-bounded and not ancestry.

claim:taxon:haramiyavia:taxonomy
biogeography · medium

The profiled material comes from the Tait Bjerg Beds of East Greenland and does not establish the complete geographic distribution of Haramiyida.

claim:taxon:haramiyavia:biogeography
ecology · medium

Complex teeth and reconstructed wear facets support plant-processing and palinal-chewing inferences, while actual diet and behaviour were not observed.

claim:taxon:haramiyavia:ecology
morphology · medium

CT data from MCZ7/95A–B and MCZ10/G95 document the dentary condyle, postdentary trough, tooth rows and occlusal wear geometry.

claim:taxon:haramiyavia:morphology
fossil-range · medium

The 205.7–201.4 Ma envelope translates the Rhaetian formation context of the named jaws and is not a global haramiyidan FAD, LAD or crown-mammal age.

claim:taxon:haramiyavia:fossil-range
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