The age of the Calvert Formation (14 million years) makes Eobalaenoptera the oldest-known member of Balaenopteroidea by three to five million years. It also considerably narrowed the gap between the earliest-known fossil record and estimated time of divergence of this clade from other baleen whales. Molecular clocks have put this divergence for balaenopteroids from other crown mysticetes by 15–20 million years.[1][2]
In their review of extant and fossil rorquals, Demere et al. (2005) questioned the balaenopteroid placement of Eobalaenoptera, noting that the holotype lack substantial cranial material that could reinforce its original classification, preferring to treat the genus as Chaeomysticeti incertae sedis.[3]
The genus name Eobalaenoptera reflects the similarities between this skeleton and species in the genus Balaenoptera such as the minke whale; eo- is a prefix meaning dawn. The species is named after Carter Harrison, a volunteer worker at the museum.
^Cassens, I., S. Vicario, V. G. Waddell, H. Balchowsky, D. Van Belle, W. Ding, C. Fan, R. S. Lal Mohan, P. C. Simões-Lopes, R. Bastida, A. Meyer, M. J. Stanhope and M. C. Milinkovitch. 2000. Independent adaptation to riverine habitats allowed survival of ancient cetacean lineages. Proceedings of the Academy of Natural Sciences 97:11343–11347.
^Nikaido, M., F. Matsuno, H. Hamilton, R. L. Brownell, Jr., Y. Cao, W. Ding, Z. Zuoyan, A. M. Shedlock, R. E. Fordyce, M. Hasegawa and N. Okada. 2001. Retroposon analysis of major cetacean lineages: the monophyly of toothed whales and the paraphyly of river dolphins. Proceedings of the Academy of Natural Sciences 98: 7384–7389.
^T. A. Demere, A. Berta and M. R. McGowen. 2005. The taxonomic and evolutionary history of modern balaenopteroid mysticetes. Journal of Mammalian Evolution 12(1/2):99-143.
