Eye, nose, hair, and throat: external anatomy of the head of a neonate gray whale (Cetacea, Mysticeti, Eschrichtiidae)

The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology
Annalisa BertaMeghan Smallcomb

Abstract

Information is scarce on gray whale (Eschrichtius robustus) anatomy and that of mysticetes in general. Dissection of the head of a neonatal gray whale revealed novel anatomical details of the eye, blowhole, incisive papilla with associated nasopalatine ducts, sensory hairs, and throat grooves. Compared to a similar sized right whale calf, the gray whale eyeball is nearly twice as long. The nasal cartilages of the gray whale, located between the blowholes, differ from the bowhead in having accessory cartilages. A small, fleshy incisive papilla bordered by two blind nasopalatine pits near the palate's rostral tip, previously undescribed in gray whales, may be associated with the vomeronasal organ, although histological evidence is needed for definitive identification. Less well known among mysticetes are the numerous elongated, stiff sensory hairs (vibrissae) observed on the gray whale rostrum from the ventral tip to the blowhole and on the mandible. These hairs are concentrated on the chin, and those on the lower jaw are arranged in a V-shaped pattern. We confirm the presence of two primary, anteriorly converging throat grooves, confined to the throat region similar to those of ziphiid and physeteroid odontocetes. A third, short...Continue Reading

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Citations

Apr 15, 2015·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Summer E DrakeJ G M Thewissen
Dec 6, 2018·Molecular Biology and Evolution·Florian EhrlichLeopold Eckhart
Feb 27, 2019·PloS One·Bertrand BouchardAurélie Célérier
Apr 5, 2019·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Jeffrey T Laitman, Kurt H Albertine
May 21, 2020·Royal Society Open Science·Julia C Quindlen-HotekVictor H Barocas
Oct 4, 2017·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Kurt H AlbertineKenneth Bo Foreman
Jun 3, 2021·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Alyx O MilneRobyn A Grant
Jul 22, 2021·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Colleen ReichmuthAri Friedlaender
Jul 22, 2021·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Natasha MynettRobyn A Grant

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