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Diunatans luctoretemergo
Taxonomy
Diunatans luctoretemergo was named by Bosselaers and Post (2010). Its type specimen is NHG 22279, a partial skull (neurocranium with nasals, ascending fragments of maxilla and premaxilla, damaged frontals (the lateral part of the sop is missing), parietals, occipitals, squam), and it is a 3D body fossil. Its type locality is Westerschelde, Zanclean, which is in a Zanclean marine sandstone in the Kattendijk Formation of the Netherlands.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Diunatans luctoretemergo Bosselaers and Post p. 335 figs. Fig. 2-11 |
| 2015 | Diunatans luctoretemergo Marx and Fordyce p. 4 figs. Figure 2 |
| 2023 | Diunatans luctoretemergo Govender and Marx p. 5 |
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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.
†Diunatans luctoretemergo Bosselaers and Post 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Bosselaers and K. Post 2010 | Diunatans luctoretemergo n. gen., n. sp. is a member of the family Balaenopteridae because it shows: 1) abruptly depressed supraorbital process of the frontal; 2) lateral border of the supraoccipital overhanging the temporal fossa; 3) prominent squamosal crest; 4) parietals overlapping the posteromedial corner of the supraorbital process of the frontal; 5) ascending process of the premaxilla reaching the nasal; 6) maxilla, pre maxilla and nasal reaching frontal and/or supra occipital in a rectilinear or almost rectilinear line; 7) tympanic bulla with a weak, single and simple main ridge; and 8) anterior process of periotic triangular and ventromedial-dorsolaterally compressed. Diunatans luctoretemergo n. gen., n. sp. diff ers from: – all extant Balaenopterinae, extant Megaptera novaeanglia (Borowski, 1781) and the nominal fossil rorquals B. cortesii; B. cuvierii (Fisher, 1829); Megaptera hubachi Dathe, 1983 and Megaptera miocaena Kellogg, 1922, in the morphology of the squamosal, the large, robust and prominent occipital condyle, the size of the tympanic bulla (relatively the largest of the family) and the orientation of its sigmoid process, and in the prominent promontorial groove of the periotic; – Balaenoptera siberi, in the morphology of the squamosal, the large, robust and prominent occipital condyle, in the size of the tympanic bulla and the direction of its sigmoid process, and in the rounded pars cochlearis (pers. obs.). Th is species is poorly described. It shows basal features and does not belong in the genus Balaenoptera (Bisconti pers. comm.; pers. obs.); – fossil B. cortesii var. portisi Sacco, 1890; B. ryani (Hanna & McLellan, 1924); Cetotheriophanes capellinii; Parabalaenoptera baulinensis Zeigler, Chan & Barnes, 1997, by the short rectangular nasal; – fossil B. davidsonii (Cope, 1872) because this species is based on a few mandibular characters only and therefore – in fact – may not be considered a valid taxon. The fossil Megapteropsis robusta Van Beneden, 1872 (= Megaptera affi nis Van Beneden, 1880); B. borealina Van Beneden, 1880; B. defi nata (Owen, 1844); B. emarginata (Owen, 1844); B. gibbosa (Owen, 1844); B. rostratella Van Beneden, 1880; B. sibbaldina Van Beneden, 1880; Plesiocetus goropii Van Beneden, 1859 (= B. musculoides Van Beneden, 1882) are considered nomina dubia (see Appendix 1) and are therefore not compared to D. luctoretemergo n. gen., n. sp. Diunatans luctoretemergo n. gen., n. sp. is not compared to B. gastaldi (Strobel, 1875) because this is an eschrichtiid (Bisconti 2008); nor to Eobalaenoptera harrisoni Dooley, Fraser & Luo, 2004 because this a mysticete of uncertain taxonomic affi nity (Deméré et al. 2005). Additionaly the nominal fossil rorquals B. cortesii, B. cortesii var. portisi and B. cuvierii are probably not balaenopterids and are awaiting taxonomic revision (Deméré et al. 2005; Bisconti in litt.) |
Measurements
No measurements are available
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| Source: f = family, subo = suborder, o = order | |||||
| References: Nowak 1991, Uhen 2004 | |||||
Age range: Early/Lower Pliocene or 5.33300 to 3.60000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Pliocene | South Africa | Diunatans luctoretemergo (115221) | |
| Zanclean | Netherlands | Diunatans luctoretemergo (type locality: 195023) |