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Eomonachus belegaerensis
Taxonomy
Eomonachus belegaerensis was named by Rule et al. (2020). Its type specimen is NMNZ S.047422, a partial skull (partial dorsoventrally distorted skull missing the anterior portion of the premaxilla, the jugals and the teeth), and it is a 3D body fossil. Its type locality is Waihi Beach, which is in a Waipipian coastal mudstone in the Tangahoe Formation of New Zealand. It is the type species of Eomonachus.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Eomonachus belegaerensis Rule et al. p. 2 figs. Fig. 1-2 |
| 2024 | Eomonachus belegaerensis Rule and Park p. 10 figs. Table 2 |
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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.
†Eomonachus belegaerensis Rule et al. 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. P. Rule et al. 2020 | Medium-sized monachine characterized by the carotid foramen being visible in ventral view, the mastoid being obscured in dorsal view, subparallel major axes of the glenoid fossa and the presence of four incisors. Differs from all other monachines in having a shortened ectotympanic tubercle (less than half the width of the postglenoid process) that is reflected dorsally to frame the external auditory meatus, a small fovea on the anteroventrolateral surface of the mastoid, a carotid foramen that is medially framed by the basioccipital (also present in Mirounga), and circular postcanines (in occlu- sal view) with a broad semicircular shelf making up half the crown with a small cusplet distolabial to the main cusp. Further differs from all monachines except Monachini in having a petrosal lobe extending between the mastoid and the tympanic bulla, and postcanines with a dominant main cusp, a broad lingual shelf, and no prominent accessory cusps; from Lobodontini and Miroungini in lacking a pos- terior extension of the tympanic posteromedial to the carotid foramen, and in having the M1 alveoli aligned with the infraorbital foramen; from Lobodontini in lacking a mastoid lip; from crown Miroungini in lacking a vaulted basi- cranium, and in having double-rooted P2–M1, separate auricular and external cochlear foramina, and a posteroven- trally oriented mastoid; from crown Monachini in having the posterolateral mastoid obscured by the supramastoid ridge in dorsal view, and M1 alveoli that are almost as large as those for P2–P4; from Monachus in lacking a dorso- ventrally thickened petrosal lobe; from Neomonachus in lacking an anteroposteriorly thick ectotympanic tubercle, and in having an inflated entotympanic that does not taper medially; and from N. tropicalis in lacking an opening on the posterodorsal surface of the bulla immediately lateral to the carotid foramen. |
Measurements
No measurements are available
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| Source: f = family, c = class, uc = unranked clade | |||||
| References: Carreño and Cronin 1993, Hendy et al. 2009, Gingerich 2003, Nowak 1991 | |||||