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Haborodelphis
Taxonomy
Haborodelphis was named by Ichishima et al. (2019). Its type is Haborodelphis japonicus.
It was assigned to Monodontidae by Ichishima et al. (2019).
It was assigned to Monodontidae by Ichishima et al. (2019).
Species
H. japonicus (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2019 | Haborodelphis Ichishima et al. |
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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. †Haborodelphis Ichishima et al. 2019
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†Haborodelphis japonicus Ichishima et al. 2019
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Ichishima et al. 2019 | SMAC1390 can be confidently identified as a member of the family Monodontidae based on the fol- lowing characters: exposure of the maxilla along the med- ial wall of the osseous nasal opening (Muizon 1988); opening of the posterior accessory foramen at the pos- teriorendofthepremaxilla(sensuVelez-Juarbe&Pyen- son 2012); large zygomatic process relative to the skull (Barnes 1990); existence of the groove margined with sharp ridges on the ventral surface of the frontal, which is a lateral continuation from the frontal groove of the orbitosphenoid; transversely wide and weakly ventrally protruded posterior portion of the palate consisting of the palatine, the pterygoid, and the posterior part of the maxilla; the palatine widely separating the right and left pterygoid hamuli; the orbit situated well anterior to the osseous nasal opening; and the orbitotemporal crest extending gently posterodorsally from the posterior end of the postorbital process of the frontal, with no abrupt change of direction of the ascending process of the max- illa and the underlying frontal at the level of the postor- bital process of the frontal in the facial portion, resulting in the anteroposteriorly elongated temporal fossa.
Haborodelphis japonicus is a moderate-sized odontocete cetacean, differing from Delphinapterus leucas in having a combination of following characters: anterior dorsal infraorbital foramina lying posterior to the level of antorbital notch; the premaxillary foramen at the level of antorbital notch; the osseous nasal opening longer than wide; the gently dorsally convex premaxillary sac fossa demarcated by the posterolateral and postero- medial sulci, both of which are clearly associated with premaxillary foramen; the palatine separating the ptery- goid hamuli posteriorly and wedged into the maxillae anteriorly on the midline; the base of the postorbital process anteroposteriorly long relative to the skull, being nearly equal to that of adult D. leucas; the ros- trum occupies roughly 40% of the whole skull length, being about the same as in neonate D. leucas; the dorsoventrally thicker pars cochlearis; and the abso- lutely small size of the periotic. Haborodelphis japonicus is different from Monodon mono- ceros in the following character states: anterior dorsal infraor- bital foramina and the premaxillary foramen much more anteriorly situated with reference to the level of the antor- bital notch; the involucrum of the tympanic bulla corre- sponding to the cochlear portion of the periotic less concave transversely; more developed anterior process of the periotic. Haborodelphis japonicus differs from Bohaskaia mon- odontoides in having a constriction of the lateral edge of the premaxilla just posterior to the level of the antorbital notch; the premaxilla simply attenuating toward the tip of the rostrum in contrast to the notable expansion immediately posterior to the tip of the rostrum in Bohas- kaia, making the anterior tip of the premaxilla rounded and blunt; the distinct posteromedial sulcus associated with the premaxillary foramen; and the palatine separat- ing the pterygoid hamuli posteriorly and wedged into the maxillae anteriorly on the midline. Haborodelphis japonicus differs from Denebola brachy- cephala in having the skull similar in size in spite of being at an earlier ontogenetic stage than the latter judging by the degree of development of crests and processes (for more detail, see below); the rostrum more triangular in dorsal view; the dorsally recurved lateral margin of the rostral part of the maxilla. |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Nowak 1991, Uhen 2004 | |||||