Published December 31, 2023
| Version v1
Journal article
Open
Middle Eocene cartilaginous fishes (Vertebrata: Chondrichthyes) of the Dnieper-Donets Basin, northern Ukraine
Description
Kovalchuk, Oleksandr, Kriwet, Jürgen, Shimada, Kenshu, Ryabokon, Tamara, Barkaszi, Zoltán, Dubikovska, Anastasiia, Anfimova, Galina, Davydenko, Svitozar (2023): Middle Eocene cartilaginous fishes (Vertebrata: Chondrichthyes) of the Dnieper-Donets Basin, northern Ukraine. Palaeontologia Electronica (a32) 26 (2): 1-37, DOI: 10.26879/1283, URL: http://dx.doi.org/10.26879/1283
Files
source.pdf
Files
(1.6 MB)
| Name | Size | Download all |
|---|---|---|
|
md5:5d6b2b3b66241493059eb6696baaa8a4
|
1.6 MB | Preview Download |
Linked records
Oops! Something went wrong while fetching results.
Additional details
Identifiers
- LSID
- urn:lsid:plazi.org:pub:5D6B2B3B6624FF93FF9EB669FFAAFFA4
- URL
- http://publication.plazi.org/id/5D6B2B3B6624FF93FF9EB669FFAAFFA4
References
- Remarks. The lateral teeth described are similar in morphology and size to those in Striatolamia macrota (Agassiz, 1843). This species was widely distributed in Europe and Asia during the Ypresian, Lutetian, and Bartonian (Cappetta, 2012). The presence of S. macrota in the fossil record of Ukraine was documented by Zhelezko and Kozlov (1999) and Udovichenko (2006). Eight species of the genus Striatolamia are now considered to be valid (Pollerspock and Straube, 2022), including two Paleocene taxa (Striatolamia ex gr. S. whitei (Arambourg, 1952), S. striata (Winkler, 1874)) and two Eocene species from the territory of Ukraine (Zhelezko and Kozlov, 1999). Striatolamia sibirica Zhelezko in Zhelezko and Kozlov (1999) was represented in the Dnieper-Donets Basin during the Bartonian. The specimens considered differ from those of S. sibirica in having larger roots, thicker crowns, and cusplets more isolated from the main cusp (Zhelezko and Kozlov, 1999). According to Ebersole et al. (2019), there are no appreciable differences between the teeth of S. macrota and S. striata, and these taxa therefore could be part of a species complex that cannot be differentiated morphologically. As compared to the specimens considered here, the teeth of the Bartonian/Ypresian species Striatolamia tchelkarnurensis are much larger and more robust, and have a less pronounced lingual ornamentation (Malyshkina, 2021).
- Rogovich (1861) described and figured a new species of the genus Oxyrhina-O. brevidens- from 'blue clay near Kyiv.' The specimen considered is part of the type series (syntype), while the other 'few teeth' mentioned in the original description were subsequently lost. Savtchenko (1912), when analysing shark remains from the Eocene of Mangyshlak, used the material from Rogovich's collection for comparison. He concluded that one specimen from his own collection was almost identical morphologically to that of Oxyrhina brevidens. This species is represented in the database by Pollerspock and Straube (2022) but placed in the genus Striatolamia, probably because of the presence of characteristic (albeit weak) striation on the lingual side of the crown. We suggest that the specimen initially described by Rogovich (1861) as O. brevidens in fact represents the upper left posterior tooth of S. macrota. It is very similar to the one figured by Cunningham (2000: pl. 10, fig. 2, upper row, second from the left).