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Kutchicetus Kutchicetus Kutchicetus
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Kutchicetus (Kutchicetus minimus Bajpai & Thewissen, 2000)


Order: Cetacea

Suborder: Archaeoceti

Family: Remingtonocetidae

Temporal range: during the Early-Middle Eocene (Lutetian and Ypresian) in what is now the coastal border of Pakistan and India.

Dimensions: length - 2,5 m, weight - 150 kg

A typical representative: Kutchicetus minimus


Kutchicetus is an extinct genus of early whale of the family Remingtonocetidae that lived during Early-Middle Eocene (Lutetian and Ypresian) in what is now the coastal border of Pakistan and India (23.7°N 68.7°E, paleocoordinates 6.0°N 61.8°E). It is closely related to Andrewsiphius with which it was synonymized by Gingerich et al. 2001. Thewissen & Bajpai 2009 proposed a new clade, Andrewsiphiinae, for the two species. Later authors, however, still accept both as separate genera.

Kutchicetus is smaller than other remingtonocetids, and probably is the smallest Eocene cetacean. With its extremely narrow snout, it resembles Remingtonocetus and Dalanistes, but its strong tail distinguishes it from both Remingtonocetus and Andrewsiphius. Its limbs were short.

Kutchicetus' vertebral formula is 7, 15, 8, 4, 20–25. Its four fused sacral vertebrae were probably articulated to the hip bone and the numerous tail vertebrae were robust and elongated in contrast to its short and relatively gracile limb bones. This morphology suggests that the tail played an important role in its locomotion, yet the proportions of the caudal-most vertebrae indicates Kutchicetus did not have flukes.

Kutchicetus' vertebral proportions are unlike those of any other cetaceans but similar to those of some land-living or semi-aquatic mammals, such as Pachyaena and otters. Kutchicetus' limbs and sacrum were probably weight-bearing and it probably swam using undulatory movements like modern otters and most likely Ambulocetus. This mode of locomotion represents a transitional stage in whale evolution.







From Wikipedia, the free encyclopedia


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