Monday, 2 December 2013

Llanocetus denticrenatus

Llanocetus was an early member of the baleen whale group (Mysticeti) but had teeth instead of baleen. It is known from a fragmentary mandible found on Seymour Island during an Argentine-American expedition in 1974-1975. It lived alongside advanced members of the archaeoceti whales (Dorudontidae) as well as primitive penguins during the Late Eocene period. With an estimated skull length of 2 m, it was a pretty large whale. A more complete fossil has also been excavated but its description has apparently not been published yet.

Llanocetus denticrenatus
Mitchell, 1989
Meaning of generic name
in honor of Dr. George A. Llano and cetus (L.) whale
Meaning of specific name
"crenated teeth"
Skull length: 2 m, Length: [not given]
Holotype (USNM 183022): a fragmentary mandible with two cheek teeth.

Referred specimens: a complete skull endocast and other bone fragments.
Age and Distribution
Horizon: Upper part (Unit III) of the La Meseta Formation. Late Eocene (Priabonian).

Locality: Seymour Island, Antarctica.
Mammalia Cetacea Mysticeti Llanocetidae
Further Reading
E. D. Mitchell. 1989. A new cetacean from the late Eocene La Meseta Formation, Seymour Island, Antarctic Peninsula. Canadian Journal of Fisheries and Aquatic Sciences 46(12):2219-2235.

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