| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Jobancetus pacificus was named by Kimura et al. (2022) [ZooBank lsid: urn:lsid:zoobank.org:act:D6E21463- 0C7D-4B84-A491-B9F48A3B36E1]. Its type specimen is I-418267, a partial skeleton (nearly complete cranium (tym- panic bullae and periotics are in situ), both mandibles, and postcranial elements including cervical, thoracic, and lumbar vertebr), and it is a 3D body fossil. Its type locality is Iwaki Koyo High School, which is in a Burdigalian marine mudstone/sandstone in the Minamishirado Formation of Japan. It is the type species of Jobancetus.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Jobancetus pacificus Kimura et al. p. 87 figs. Figures 2–9 |
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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.
†Jobancetus pacificus Kimura et al. 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Kimura et al. 2022 | Jobancetus pacificus can be identified from all other Isanacetus-group by having unique combination of the following morphological characters: ascending processes of premaxillae and maxillae extend- ing posteriorly to the level of the middle of the orbit, nasals elongated and its lateral edges being almost par- alleled, frontals forming a triangular elevated plateau at the vertex, sharp and well-developed transverse crest on the supraorbital process of frontal, sagittal crest formed by frontals and parietals, large squamosal fossa, which is posteriorly extended well beyond the level of the poste- rior surface of the occipital condyle, slender and elongate zygomatic process of squamosal, which directs anteriorly and slightly laterally, large basioccipital crest, ventrally protruded angle of mandible, two longitudinal ridges on the ventral surface of the horizontal ramus, large foramen transversarium in axis vertebra.
Jobancetus can be distinguished from Atlanticetus, Diorocetus, Isanacetus, Parietobalaena, and Taikicetus by having sharp and well-developed transverse crest on the supraorbital process of frontal, sagittal crest formed by frontals and parietals, large squamosal fossa, which is posteriorly extended well beyond the level of the posterior surface of occipital condyle; further differs from Atlantice- tus and Diorocetus by having ascending processes of pre- maxillae and maxillae extending posteriorly to the level of the middle of the orbit; further differs from Atlanticetus by having lateral edges of nasals being almost parallel. Also, it differs from Cophocetus, Titanocetus, Pinoce- tus, and Uranocetus by having sharp and well-developed transverse crest on the supraorbital process of frontal; further differs from Titanocetus by having anteriorly pointed apex of the supraoccipital and ventrally protruded angle of mandible; further differs from Uranocetus by having lateral edges of nasals being almost parallel and by lack- ing circular outline of the mandibular condyle in the pos- terior view and transversally thickened apex of coronoid process of the mandible. By having frontals forming a tri- angular elevated plateau at the vertex, Jobancetus differs from Atlanticetus, Cophocetus, Diorocetus, Isanacetus, Parietobalanea, Pelocetus, Pinocetus, Taikicetus, and Titanocetus. Jobancetus differs from Aglaocetus by hav- ing anterior border of mandibular foramen located pos- terior to level of apex of coronoid process; differs from Mauicetus by having a posterior apex of nuchal crest posterior to the occipital condyle; differs from Imerocetus by having sharp and well-developed transverse crest on the supraorbital process of frontal. Unlike Atlanticetus, Halicetus, Isocetus, and Pelocetus, Jobancetus has trans- verse process of atlas dorsoventrally wide and located on the level of the center of the articular fovea. Isocetus also differs from Jobancetus by having mandibular condyle round and transversely wide. Jobancetus also differs from Piscocetus and Tiphyoce- tus by having large squamosal fossa, which is posteriorly extended well beyond the level of the posterior surface of occipital condyle; further differs from Tiphyocetus by lacking a convexly curved ventral surface of squamosal. Jobancetus has a slender and elongate zygomatic process of squamosal, which directs anteriorly and slightly laterally, differing from Cophocetus, Otradnocetus, Piscocetus, and, Taikicetus. Jobancetus further differs from Otradonocetus by having ascending processes of pre- maxillae and maxillae extending posterior to the level of the middle of orbit and by lacking the circular outline of the mandibular condyle in the posterior view. By having a large foramen transversarium of the axis, Jobancetus differs from Cophocetus, Diorocetuss, Halicetus, Isanac- etus, Pelocetus, and Thinocetus. Jobancetus also differs from Thinocetus by having posterolateral edge of the exoccipital located far posterior to the level of the posterior surface of the occipital condyle. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||
Age range: Burdigalian or 20.44000 to 15.97000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burdigalian | Japan (Fukushima) | Jobancetus pacificus (type locality: 227423) |