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PubMed2001

[The diversity and distribution of the cetaceans of Costa Rica (Cetacea: Delphinidae, Physeteridae, Ziphiidae y Balaenopteridae)].

The first complete checklist of Costa Rican cetaceans is presented with a total of 28 species (35% of the group's world diversity). Most of the species occur in the Pacific Ocean (89%) and most are considered oceanic (57%), common (54%) and resident (68%). The known distribution and status of each species are also provided.

Animals↗

PubMedDate not supplied

[Morphological adaptation of the peripheral region of the acoustic analyzer in echolocating Cetaceae during pre- and postnatal development].

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Adaptation, Biological↗

PubMed1987

Pakicetus inachus and the origin of whales and dolphins (Mammalia: Cetacea).

The present paper is concerned with the comparative morphology of the archeocete and odontocete skull. Among the archeocetes, the recently described lower Eocene Pakicetus inachus obviously represents an early stage of adaptation to aquatic life. The morphology of the incomplete cranial remains, however, gives no evidence that Pakicetus was an amphibious intermediate stage. The evolution of advanced archeocetes and odontocetes is characterized by the successive acquirement of new morphological devices related to the emission and perception of ultrasound under water. The formation of a sonar system in odontocetes obviously not only helped to compensate for the loss of the peripheral olfactory system but moreover was a substantial factor in the evolution of the exceptional dolphin brain.

Animals↗

PubMed1972