Remingtonocetidae

Remingtonocetidae is an extinct family of early whales known from Eocene fossils, especially in South Asia. Its members retained features of land mammals while showing adaptations for swimming and underwater hearing.

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Cetacea: The order of mammals comprising whales, dolphins, and porpoises. Remingtonocetids belong to this broader group of mammals.
Aquatic locomotion: Movement through water using body undulation, limbs, or other structures. Remingtonocetid body proportions reflect locomotion adapted to swimming.
Eocene: A geological epoch lasting from about 56 to 34 million years ago. Remingtonocetids lived during this interval of rapid early-whale evolution.
Remingtonocetus: An extinct genus of Eocene whale and the namesake genus of Remingtonocetidae. Its fossils anchor the family's name and help define its anatomy.
Archaeoceti: An informal grouping of extinct early whales that lived before modern whale lineages diversified. Remingtonocetids are among the early whales commonly grouped as archaeocetes.
Cetacean hearing: The specialized auditory systems that allow whales and dolphins to detect sound underwater. Their ear region preserves adaptations associated with underwater hearing.
India: A South Asian region whose Eocene deposits preserve important early whale fossils. Many known remingtonocetid fossils come from the Indian subcontinent.
Andrewsiphius: An extinct genus of Eocene remingtonocetid whale known from South Asia. Its distinctive skull and elongated snout illustrate variation within the family.
Pakicetidae: An extinct family of early whales, including some of the earliest known cetaceans, from the Eocene of South Asia. Pakicetids provide an earlier comparison for the aquatic transition seen in remingtonocetids.
Involucrum: A thickened medial wall of the cetacean auditory bulla, characteristic of whales. This diagnostic ear-bone feature helps identify early cetacean fossils.