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Archaeobalaena
Taxonomy
Archaeobalaena was named by Tanaka et al. (2020). Its type is Archaeobalaena dosanko.
It was assigned to Balaenidae by Tanaka et al. (2020).
It was assigned to Balaenidae by Tanaka et al. (2020).
Species
A. dosanko (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Archaeobalaena Tanaka et al. p. 2 figs. Fig. 2-15 |
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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. †Archaeobalaena Tanaka et al. 2020
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†Archaeobalaena dosanko Tanaka et al. 2020
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y. Tanaka et al. 2020 | Among the Balaenidae, A. dosanko uniquely has a deep promontorial groove of the pars cochlearis of the periotic (character 151). Archaeobalaena dosanko can be differentiated from other balaenids, except Morenocetus parvus by having a slender zygomatic process, and posteriorly oriented postorbital process in dorsal view (character 38). Archaeobalaena dosanko can be differentiated from M. parvus by having a slender and laterally tilted down of the supraorbital process. Archaeobalaena dosanko can be differentiated from all balaenids, except the Balaena and Eubalaena by having a weakly and laterally projected lateral margin of the nuchal crest.
Comparison with more basal balaenids (M. parvus and Peripolocetus vexillifer), A. dosanko can be differentiated by having a more or less same length of the anterior process and pars cochlearis of the periotic (character 139), hypertrophied and blade-like lateral tuberosity (character 144), posterior process of the periotic orienting a right angle to the axis of the anterior process in ventral view (character 170), laterally reduced involucral ridge in dorsal view (character 181), the dorsolateral surface of involucrum forming a continuous rim (character 190), and a flat anteromedial portion of the ventral surface of tympanic bulla (character 195). Comparison with more late diverging balaenids (B. astensis, Balaenella brachyrhynus and so on), A. dosanko can be differentiated by having the medial lobe of the tympanic bulla (character 187). Comparison with crown balaenids (Balaena spp. and Eubalaena spp.), A. dosanko can be differentiated by having a thickened and flat lateral surface of the orbital rim of the supraorbital process (character 40), pyramidal process (character 141), laterally exposed and distinct compound posterior process from the lateral skull wall (character 172), no crest on the parieto- squamosal suture (character 93), no hypertrophied suprameatal fossa (character 162), and no transverse creases on the dorsal surface of the involucrum (character 191). |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Nowak 1991, Uhen 2004 | |||||