Beaked Whale Identification Guide

Lateral View of Basirostral Groove

The basirostral groove is a deep lateral longitudinal groove at the base of te rostrum that terminates posteriorly in a blind pit below the antorbital tubercle.
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A deep groove is present where the base of the rostrum meets the antorbital region. This groove extends anteriorly > 5 cm along the lateral edge of the rostrum.
There is no groove present where the base of the rostrum meets the antorbital region or only a shallow groove exists that does not extend more than 1 cm past the antorbital tubercle.
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