Tiucetus

Tiucetus is an extinct genus of cetotheriid baleen whale known from the Late Miocene Pisco Formation of Peru.
Description.
"Tiucetus" is distinct from other cetotheriids in having a squamosal cleft; from eomysticetids in having comparatively short nasals, a more anteriorly projected supraoccipital and parietal, and a tympanic bulla that is rotated so that the inner posterior prominence faces dorsally.
Classification.
"Tiucetus" falls basally in Cetotheriidae, less derived than "Joumocetus" and "Cephalotropis".
Palaeogeography.
Other marine mammals found in the Pisco Formation include another cetotheriid, "Piscobalaena", the odd dolphin "Odobenocetops", the killer sperm whale "Acrophyseter", the long-necked seal "Acrophoca", and aquatic sloth "Thalassocnus".