Diunatans Bosselaers & Post 2010, n. gen

Genus Diunatans n. gen. TYPE SPECIES. — Diunatans luctoretemergo n. sp. ETYMOLOGY. — Diunatans: “diu” = long time (and hence long distance-) and “natans” (> natare) = swimming (swimmer). DIAGNOSIS. — Diunatans n. gen. is a small sized rorqual, roughly of the size of extant B. acutorostrata Lacépède, 1804, characterised by: very short nasal; mediolaterally wide pterygoid fossa; large, robust and prominent occipital condyle; mediolaterally wide squamosal body lateral to the supraoccipital; dorsal bulge on squamosal; tympanic bulla very large compared to zygomatic width; wide, globose tympanic bulla (L/W ratio: 1.24) with sigmoid process perpendicular to long axis; rounded and bulbous pars cochlearis (L/W ratio: 1.23-1.26); very long, slender and curved stapes; massive and square basioccipital process; wide basioccipital.