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Kermackodontidae
Taxonomy
Kermackodontidae was named by Butler and Hooker (2005). Its type is Kermackodon.
It was assigned to Multituberculata by Butler and Hooker (2005); and to Euharamiyida by Mao et al. (2022).
It was assigned to Multituberculata by Butler and Hooker (2005); and to Euharamiyida by Mao et al. (2022).
Subtaxa
Synonyms
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Synonymy list
Year | Name and author |
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1998 | Eleutherodontidae Kermack et al. p. 586 |
2000 | Eleutherodontidae Butler |
2004 | Eleutherodontidae Kielan-Jaworowska et al. pp. 253, 258 |
2005 | Kermackodontidae Butler and Hooker p. 186 |
2013 | Eleutherodontidae Zhou et al. |
2014 | Eleutherodontidae Bi et al. |
2017 | Eleutherodontidae Luo et al. p. 326 |
2018 | Eleutherodontidae Huttenlocker et al. |
2022 | Kermackodontidae Mao et al. p. 4 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Fm. †Kermackodontidae Butler and Hooker 2005
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G. †Kermackodon Butler and Hooker 2005
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†Kermackodon oxfordensis Kermack et al. 1998
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Invalid names: Kermackodon multicuspis Butler and Hooker 2005 [synonym], Kirtlingtonia catenata Butler and Hooker 2005 [synonym], Millsodon superstes Butler and Hooker 2005 [synonym]
Invalid names: Kirtlingtonia Butler and Hooker 2005 [synonym], Millsodon Butler and Hooker 2005 [synonym]
Invalid names: Eleutherodontidae Kermack et al. 1998 [synonym]
Diagnosis
Reference | Diagnosis | |
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K. A. Kermack et al. 1998 (Eleutherodontidae) | Suborder is monotypic, erected to include the family Eleutherodontidae nov. The diagnosis is the same as for the suborder. | |
P. M. Butler and J. J. Hooker 2005 | Second uppermolar wide mesially and narrowed distally. Cusps pointed when unworn, of unequal height; cusps of each row connected by a longitudinal crest. Lingual row markedly convex, the last cusp closing the central valley distally. Seven lingual cusps, the most mesial ones smallest. Five buccal cusps, of which the last two are large, and the first three are elevations on the mesial crest of the fourth. Anterobuccal ridge possibly represented by a rounded cingular shelf. Differs from “Plagiaulacida” (except possibly Albionbaataridae ofwhich M2 is unknown) in themore numerous, pointed cusps, joined by longitudinal crests (as opposed to blunt cusps separated by transverse grooves). Resembles most Paulchoffatiidae and differs from other “Plagiaulacida” in the pointed distal end of the tooth, curvature of the lingual row, and closure of the central valley by a distal cusp. Referred posterior lower premolar (p4) differs from other multituberculates in being triangular in side view, the blade rising to a central peak; and falling to cingulum level at the mesial and distal ends; there are four denticulations, three close together near the peak; buccal cusp row semicircular, confined to the distal end of the tooth and in continuity with the distal end of the blade. | |
F. Mao et al. 2022 | Differs from other Jurassic euharamiyidans in having heart-shaped P4 and upper molars with three longitudinal rows of cusps; a secondary cusp Ax and central cusp row (row Ax) present between cusp row A and row B; a secondary basin developed between row Ax and row A; the ultimate lower premolar (p4) bearing a few uneven serrations and a small basined dis- tal heel. Differs from Triassic “haramiyidans” in having well-developed cusps A1 and a1, small cusps between A1 and Ax, broad central basin, and development of more cusps on the basin margin. Differs from multituberculates in having molar teeth with basined crowns that bear transverse flutings with sharp edge, cusps with uneven size in which the distobuccal one is the largest on upper molars, P4 is heart-shaped, and p4 with a high crown that has a triangular profile in buccal or lingual view, a distal basined heel, a few unevenly spaced serrations, mesial end not truncated. |
Measurements
No measurements are available
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Source: c = class, subp = subphylum, uc = unranked clade | |||||
References: Hopson 1973, Hendy et al. 2009, Carroll 1988, Luo et al. 2003 |
Age range: base of the Late/Upper Bathonian to the top of the Early/Lower Callovian or 167.70000 to 161.20000 Ma
Collections (7 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Late/Upper Bathonian | United Kingdom (England) | Eleutherodon oxfordensis, Millsodon superstes, Kermackodon multicuspis (131073) Eleutherodontidae indet., Kermackodontidae indet., Butlerodon quadratus, Kermackodon sp. (224639) Kirtlingtonia catenata, Kermackodon multicuspis, Multituberculata indet. (39075) Multituberculata indet. (57124) | |
Early/Lower Callovian | China (Nei Mongol) | Megaconus mammaliaformis (27891) | |
Oxfordian | China (Liaoning) | Xianshou linglong, Xianshou songae, Maiopatagium furculiferum (91487) | |
Oxfordian | China (Hebei) | Vilevolodon diplomylos (167300) |