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Antwerpibalaena liberatlas
Taxonomy
Antwerpibalaena liberatlas was named by Duboys de Lavigerie et al. (2020). Its type specimen is IRSNB M2325, a partial skeleton (comprising a fragmentary basicranium, both tympanoperiotics, the right auditory ossicles, both mandibles, parts of the hyoid apparatus, the right forelimb, all ), and it is a 3D body fossil. Its type locality is Kieldrecht Lock, which is in a Piacenzian marine sandstone in the Lillo Formation of the Netherlands. It is the type species of Antwerpibalaena.
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Antwerpibalaena liberatlas Duboys de Lavigerie et al. figs. Figs 2–14 |
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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.
†Antwerpibalaena liberatlas Duboys de Lavigerie et al. 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Duboys de Lavigerie et al. 2020 | Medium-sized right whale differing from all other chaeomysticetes except balaenids in having a notably twisted mandibular symphysis, a strongly hyper- trophied lateral tuberosity and body of the periotic, a blade-like flange on the lateral tuberosity, and a small anterior process of the periotic with a rounded outline in medial view. Differs from all described balaenids in having an anteroposteriorly compressed external acoustic meatus delineated by a low, distally fading posterior meatal crest; further differs from Balaenula, Balaenella, Balaenotus, Morenocetus and Peripolocetus in its larger size; from Morenocetus and Peripolocetus in having a pointed, rather than bulbous, lateral tuberosity of the periotic bearing a blade-like flange; from Peripolocetus in having a transversely concave anteromedial portion of the tympanic bulla (in ventral view); from Idiocetus guiccicardinii in having a constricted, rather than massive, base of the compound posterior process of the tympanoperiotic; from Balaenella, Balaenotus, Balaena mysticetus, Balaena ricei and Eubalaena in having a larger hiatus Fallopii; from Balaenula in having a more acute Eustachian outlet and a flattened compound posterior process; from Balaenella in having a thicker main ridge of the tympanic bulla; from Balaenotus in having a less trans- versely concave anteromedial portion of the tympanic bulla (in ventral view); from Balaena mysticetus, Balaena ricei and Eubalaena in being smaller and in showing less hypertrophy of the periotic; and from Balaena mysticetus, Balaena ricei and extant Eubalaena spp. in having an unfused atlas. |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Uhen 2004, Nowak 1991 | |||||
Age range: Piacenzian or 3.60000 to 2.58000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Piacenzian | Netherlands | Antwerpibalaena liberatlas (type locality: 209757) |