Samiksha Jaiswal

Mammalodon

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Kingdom  Animalia
Infraorder  Cetacea
Scientific name  Mammalodon colliveri
Rank  Genus
Class  Mammalia
Family  †Mammalodontidae
Phylum  Chordata
Order  Even-toed ungulate
Mammalodon i53photobucketcomalbumsg62TigerQuolldinosaur
Similar  Janjucetus, Aetiocetus, Aetiocetidae, Janjucetus hunderi, Llanocetus

Mammalodon is an extinct genus of archaic baleen whale belonging to the family Mammalodontidae.

Contents

Discovery

The type species, M. colliveri, was discovered in 1932 in the Jan Juc Formation on the small Bird Rock island south of the Point Lillias peninsula in Torquay, Victoria in Australia (38.3°S 144.3°E / -38.3; 144.3, paleocoordinates 52.9°S 142.2°E / -52.9; 142.2). The second species, M. hakataramea, was discovered in the Kokoamu Greensand of New Zealand.

Description

Mammalodon, with a length of 3 m (9.8 ft), was smaller and more basal than modern baleen whales.

Mammalodon Mammalodon

Mammalodon is a mix of archaeocete plesiomorphies (retained primitive traits) and mysticete synapomorphies (traits shared with more derived taxa), such as a short rostrum, reduced premaxillae, and orbits directed anterodorsally — defining features of mysticete.

Mammalodon mammalodon DeviantArt

It had a short face and a delicate premaxilla with only one or two incisors, and the lateral rim of the internal auditory meatus was lengthened towards the brain case which formed a longitudinal ridge.

Palaeobiology

As with the closely related genus Janjucetus, Mammalodon lacked baleen, instead possessing well-developed teeth. As such, it was not able to filter-feed in the same manner as extant baleen whales, making its diet and ecological niche a mystery. As the teeth are widely spaced, they may have developed a method of filter-feeding unlike that of other whales. It may have been a bottom filter feeder, its blunt snout helping to suck up organisms from the sea floor.


Mammalodon

References

Mammalodon Wikipedia


Similar Topics
Janjucetus
Llanocetus
Mammalodontidae
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