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Squalodon murdochi
Taxonomy
Squalodon murdochi was named by Godfrey and Lambert (2023). Its type specimen is CMM-V-2287, a partial skeleton (most of a broken/disarticulated skull (see details of preserved parts below), the symphyseal part of the mandible, and several detached teeth. An atlas, another), and it is a 3D body fossil. Its type locality is Plum Point, north, Zone 10, which is in a Langhian estuary/bay claystone in the Calvert Formation of Maryland.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2023 | Squalodon murdochi Godfrey and Lambert p. 56 figs. FIGURES 2.5, 2.6 |
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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.
†Squalodon murdochi Godfrey and Lambert 2023
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. J. Godfrey and O. Lambert 2023 | With a condylobasal length of about 1040 mm, S. murdochi is intermediate in size between S. calvertensis and S. whitmorei. It diers from all other squa- lodontids (or taxa at least tentatively attributed to the family) for which the proximal region of the rostrum is well preserved (Eosqualodon langewieschei, Phoberodon arctirostris, S. ant- werpiensis, S. barbarus, S. bariensis, S. bellunensis, S. calverten- sis, S. peregrinus, S. whitmorei, and Squalodon sp. nov. from Belgium) in that the alveoli of the posterior upper cheek teeth are markedly crowded and consequently they imbricate (distal alveolus for a given tooth overlapping anteromedially with the mesial alveolus of the next, posterior tooth). It further diers from E. langewieschei, P. arctirostris, S. bariensis, S. bellunensis, S. calvertensis, S. peregrinus, and S. whitmorei in the presence of a distinct longitudinal ridge (Figure 2.5A) and groove on the dorsal surface of the frontal lateral to the part covered by the maxilla in the supraorbital region. Focusing on the other Squa- lodon species from the Calvert Formation, it further diers from S. calvertensis and S. whitmorei in the dorsal part of the occipital shield being excavated by two deep fossae separated by a distinct external sagittal crest (Figure 2.5C) and in the posteroventral margin of the paroccipital process being both proportionately and absolutely thicker (Figure 2.6G). It further diers from S. calvertensis in each frontal being anteroposteriorly longer than wide on the vertex; the palate being much more ventromedially projected; the absence of a hemispherical swelling of the post- tympanic process; and the apex of the postglenoid process being mediolaterally wide and rounded in anterior view (vs. pointed in S. calvertensis), and from S. whitmorei in the upper tooth count being at least 18 for each side (16 in S. whitmorei) and the open- ing of the olfactory bulb lacking the development of a cylindrical tube. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| Reference: Uhen 2004 | |||||