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Icaphoca choristodon
Taxonomy
Icaphoca choristodon was named by Dewaele and de Muizon (2025) [urn:lsid:zoobank.org:act:D62656C2-2C7D-4C7C-87F9-2F892F941620]. Its type specimen is MNHN.F.PPI270, a partial skeleton (subcomplete skull with associated left and right mandibles, atlas, axis, third, fourth, and fifth cervical vertebrae), and it is a 3D body fossil. Its type locality is Cerro la Bruja, which is in a Miocene offshore shelf siltstone in the Pisco Formation of Peru. It is the type species of Icaphoca.
Entered
by M. Uhen on 2026-05-14; modified by M. Uhen on 2026-05-14
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Icaphoca choristodon Dewaele and de Muizon p. 468 fig. 468 |
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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.
†Icaphoca choristodon Dewaele and de Muizon 2025
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. Dewaele and C. de Muizon 2025 | Small to medium-sized lobodontin monachine, having an elongated rostrum, similar to, but not to the same extent as Acrophoca longirostris. Icaphoca choristodon n. gen., n. sp. is a lobodontin, based on the following unambiguous synapomorphies, as detailed by the phylogenetic analysis, below: a parasagittal orientation of the medial margins of the tympanic bullae; the presence of a lip in the anteromedial region of the mastoid, abutting the posteromedial edge of the tympanic bulla; and the transverse foramen of the atlas is at least partially visible in dorsal view. Icaphoca choristodon n. gen., n. sp. differs from all other monachine except Acrophoca longirostris in the presence of well-developed diastemata between all post-canine teeth, the diastema between P4 and M1 being distinctly larger. Icaphoca also shares with Acrophoca the anterior end of the maxillary process of the jugal reaching above or dorsomedially to the infraorbital foramen. It differs from Acrophoca in having six upper incisors as in Magophoca brevirostris, and Noriphoca gaudini (a condition, absent in all other monachines), in having a moderately inflated ectotympanic, and an atlas in which the transverse foramen is
visible in posterior view only. |
Measurements
No measurements are available
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| Source: f = family, c = class, uc = unranked clade | |||||
| References: Nowak 1991, Gingerich 2003, Carreño and Cronin 1993, Hendy et al. 2009 | |||||
Age range: Late/Upper Miocene or 11.63000 to 5.33300 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Miocene | Peru (Ica) | Icaphoca choristodon (type locality: 45487) |