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Updated: Feb 16, 2026

Bottlenose Dolphin Tursiops truncatus Spermatozoa: Collection, Cryopreservation, and Heterologous In Vitro Fertilization
Published on: August 21, 2017
A new tropical Oligocene dolphin from Montañita/Olón, Santa Elena, Ecuador
Yoshihiro Tanaka1,2,3, Juan Abella4,5, Gabriel Aguirre-Fernández6
1Osaka Museum of Natural History, Osaka, Japan.
Abstract:
A new small probable Oligocene dolphin from Ecuador represents a new genus and species, Urkudelphis chawpipacha. The new taxon is known from a single juvenile skull and earbones; it differs from other archaic dolphins in features including widely exposed frontals at the vertex, a dorsally wide open vomer at the mesorostral groove, and a strongly projected and pointed lateral tuberosity of the periotic. Phylogenetic analysis places it toward the base of the largely-extinct clade Platanistoidea. The fossil is one of a few records of tropical fossil dolphins.
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