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Plotornis
Taxonomy
Plotornis was named by Milne-Edwards (1874). It is not extant. Its type is Plotornis delfortrii.
It was assigned to Diomedeidae by Cheneval (1984), Olson (1985), Carroll (1988); to Procellariidae by Lambrecht (1933), Mlikovsky (2002); and to Pandiomedeidae by Ksepka et al. (2023).
It was assigned to Diomedeidae by Cheneval (1984), Olson (1985), Carroll (1988); to Procellariidae by Lambrecht (1933), Mlikovsky (2002); and to Pandiomedeidae by Ksepka et al. (2023).
Species
Synonymy list
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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.
G. †Plotornis Milne-Edwards 1874
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†Plotornis archaeonautes Ksepka et al. 2023
†Plotornis avernensis Milne-Edwards 1867
†Plotornis delfortrii Milne-Edwards 1874
†Plotornis graculoides Portis 1884
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. T. Ksepka et al. 2023 | Plotornis is differentiated from all crown albatrosses by a more slender beak and conspicuously shorter processus supracondylaris dorsalis which tapers distally (distal margin squared in crown albatrosses). Differs from Tydea in having a longer processus supracondylaris dorsalis which is cranial-laterally directed (proximally deflected in Tydea). Differs from Diomedavus in more proximally located apex of crista del- topectoralis of the humerus, and in the absence of an ossified retinaculum extensorium of the tarsometatarsus. Differs from Aldiomedes in wider beak. Plotornis differs from poorly known taxa historically lumped in the genus Diomedea as follows: from ‘Diomedea’ thyr- idata and potentially also ‘Diomedea’ tanakai in having a more slender beak tip (the wide beak tip in the latter is based on a tentatively referred specimen); from ‘Diomedea’ tanakai in having a less medially flared rim of the cotyla medialis; from ‘Diomedea’ californica based on much smaller size (overall size approximately two-thirds that of D. californica based on proximal tarsometatarsus width); and from ‘Diomedea’ milleri in having a larger plantar opening of the lateral foramen vasculare proximale. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Bush and Bambach 2015, Marsh 1875, Benton 1983 | |||||
Age range: Aquitanian or 23.04000 to 20.45000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Aquitanian | France (Auvergne) | P. arvernensis (125333) | |
| Aquitanian | New Zealand (South Island) | P. archaeonautes (232409) | |
| Early/Lower Miocene | Italy (Piemonte) | Chenornis graculoides (155755) |