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Taxonomy
Nanokogia was named by Velez-Juarbe et al. (2015). Its type is Nanokogia isthmia. It was considered monophyletic by Velez-Juarbe et al. (2015).
It was assigned to Kogiidae by Velez-Juarbe et al. (2015), Marx et al. (2016) and Berta (2017); and to Kogiinae by Collareta et al. (2017).
It was assigned to Kogiidae by Velez-Juarbe et al. (2015), Marx et al. (2016) and Berta (2017); and to Kogiinae by Collareta et al. (2017).
Species
N. isthmia (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Nanokogia Velez-Juarbe et al. p. 5 figs. Figs. 2-14 |
| 2016 | Nanokogia Marx et al. p. 123 |
| 2017 | Nanokogia Berta p. 161 |
| 2017 | Nanokogia Collareta et al. p. 269 figs. Figure 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.
G. †Nanokogia Velez-Juarbe et al. 2015
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†Nanokogia isthmia Velez-Juarbe et al. 2015
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Velez-Juarbe et al. 2015 | Small kogiids, with an estimated body length of ~1.95–2.16 m (based on equation for Physeteroidea from Pyenson and Sponberg [27]), similar in size to Kogia sima [28]. Recognized as kogiid based on: bizygomatic width of less than 40 cm (c. 8[0]); presence of a sagittal crest; c. 14[1]); external nares greatly asymmetric; c. 18[1]) and located at the level of the supraorbital processes; absence of nasals (c. 19[2]); and right maxilla reaching the sagittal plane of the skull on the posterior wall of the supracranial basin. Differs from all other kogiids by the following combination of characters: absence of upper teeth, shared with Scaphokogia cochlearis and Kogia spp., unknown in Praekogia cedrosensis and Thalassocetus antwerpiensis; antorbital notches form a narrow slit (c. 9[2]), shared with Scaphokogia, Praekogia, and Kogia; postorbital process overhanging the zygomatic process, shared with Thalassoce- tus antwerpiensis and Kogia; presphenoid not covered ventrally by the vomer, shared with Aprixokogia kelloggi, Scaphokogia, and Kogia; left premaxilla not reaching the sagittal facial crest, shared with Aprixokogia, Scaphokogia and Kogia. Shares with Praekogia and Kogia: antorbital notches within the supracranial basin (c. 10[1]); long postglenoid process of the squamosal (c. 28[0]); and, a wide notch on the squamosal for the enlarged posterior process of the tympanic (c. 29[1]). Shares with Aprixokogia an elongated temporal fossa (c. 26[0]) in con- trast to the anteroposteriorly-shortened fossa of Kogia, or the rounded fossa in Praekogia. Shares with Praekogia relatively mediolaterally-thin maxillary crests; and wide but relatively shallow supracranial basin, shared with Praekogia and Thalassocetus, unlike the deeper basin seen in Aprixokogia and Kogia, or the broad, rounded basin of Scaphokogia. Shares with Kogia the presence of a narrow, rounded notch between the hamular process and the medial lamina of the pterygoid (absent in Aprixokogia, unknown in Thalassocetus, Scaphokogia and Praekogia). Differs further from Kogia sima and K. breviceps in having a relatively longer rostrum, similar to K. pusilla. Diagnosed by the following autapomorphies: in lateral view the postero-dorsal corner of the lacrimal + jugal is not deeply wedged between the frontal and maxilla (c. 23[0]); the lateral edge of the frontal portion of the right premaxilla is convex, not forming a crest; and the nuchal crest and posterolateral edges of the supracranial basin overhang the occipital surface of the cranium in dorsal, lateral and posterior views, but not to the extreme seen in Scaphokogia. |