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Bohaskaia monodontoides
Taxonomy
Bohaskaia monodontoides was named by Velez-Juarbe and Pyenson (2012). Its type specimen is USNM 182963, a partial skull (partial skull including tympanoperiotics), and it is a 3D body fossil. Its type locality is Rice's Pit, which is in a Zanclean shallow subtidal siltstone in the Yorktown Formation of Virginia. It is the type species of Bohaskaia.
Synonymy list
| Year | Name and author |
|---|---|
| 2012 | Bohaskaia monodontoides Velez-Juarbe and Pyenson p. 477 figs. Figs. 2-5 |
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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.
†Bohaskaia monodontoides Velez-Juarbe and Pyenson 2012
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Velez-Juarbe and N. D. Pyenson 2012 | Monodontidae based on (1) the medial exposure of the maxillae surrounding the anterior and lateral margins of the external bony nares, forming a ‘keyhole window’ reflected in rectilinear exposure of the maxillae anterior of the nares and maxillary exposures rimming the anterolateral narial margins; (2) lack of fossae for the pterygoid sinus in the orbital region (also absent in Denebola); and (3) a lateral lamina of the palatine that passes anterior of the lateral edge of the frontal groove. Bohaskaia shares with Denebola: (1) a subcircular, blunt rostrum in dorsal view, which differs from the squared, dorsoventrally flattened rostral terminus of Delphinapterus and the broadly triangular rostral outline of Monodon (ignoring the enlarged maxillary alveolus for the tusk in males); (2) premaxillae that dominate the anterior end of the rostrum, relative to the max- illae, in dorsal view, differing from Delphinapterus, which has rectilineal premaxillae and maxillae in equivalent widths, and differing from Monodon, whose premaxillae taper with the max- illae; (3) having the posterior end of the premaxillae reaching to about mid-level of the external nares; and (4) palatines that are separated in the midline by the maxillae.
Bohaskaia shares with both Denebola and Delphinapterus: (1) pinching of the dorsal profile of premaxillae by anteromedial- most dorsal infraorbital foramina, which undercut the lateral margins of the premaxillae (this feature is absent in Monodon); (2) shallow and planar premaxillary sac fossae, whereas those of Monodon are convexly inflated; and (3) teeth oriented an- teroventrally. Bohaskaia exclusively shares with Delphinapterus: (1) a window-like exposure of the vomer on the posterior of the palate (unknown in Denebola); and (2) anteromedial sulci of the premaxillae that extend anterior of the level of the antorbital notches. It shares with Denebola and Monodon: (1) a narrow V-shaped outline of the anterior margin of the exposure of the maxilla medial to the premaxilla anterior to the external nares, differing from the U-shaped outline of Delphinapterus; and (2) apex of vertex composed of frontals. Bohaskaia shares with Delphinapterus and Monodon: (1) an absence of premaxillary teeth; (2) a raised rostral portion of premaxilla, giving the rostrum a dorsally convex outline when viewed laterally; and (3) long anterolaterally oriented frontal groove. Bohaskaia exclusively shares with Monodon a vertex that is constricted at the base, forming a knob dorsally, and rounded dorsal outline of the nasals. Lastly, Bohaskaia displays the following autapomorphies: (1) contact between the maxillae and vomer in the posterior palate; (2) open, or L-shaped, antorbital notches of the maxillae; (3) cardiform exposure of the premaxillae in the palate; and (4) pro- portionately wider external nares, relative to the breadth of the skull; (5) frontal groove more anteriorly oriented relative to the long axis of the skull (∼33◦); and (6) posterior accessory fora- men and sulcus, positioned much further anteriorly, relative to external bony nares, than in any other monodontid (although related to the posterior extent of the premaxillae, which Bo- haskaia shares with Denebola, this character is unclear in the latter). |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Uhen 2004, Nowak 1991 | |||||