Top Tweets for #cranialfeatures

1 day ago

Regarding an #extinct, newly described #species of toothed #whale from the late #Miocene in present-day Peru, which is distinguished by unique #cranialfeatures. Bilateral symmetry is the most significant #evolutionaryinnovation (#apomorphy) of the #Bilateria. It facilitated a substantial radiation of species within both the Protostomia and Deuterostomia. Such #radiation is invariably accompanied by the formation of #ecologicalniches, leading to the evolution of #specific #adaptations to particular environmental conditions. #Asymmetries have #evolved across a wide variety of organismal groups, enabling them to adopt unconventional lifestyles. Examples include flatfish (#Pleuronectiformes) and, the focus here, whales. In connection with their fully #aquatic existence and the necessity for social #communication and orientation within this environment, sound-producing organs have evolved in the forehead region of whales. In toothed whales, these are associated with cranial asymmetries, which are particularly pronounced in #spermwhales (#Physeteroidea). Their skulls exhibit a leftward shift of the right #facialbones, including the #premaxilla and #nasalbone, along with the development of a cavity in the supracranial region that houses the whale’s #foreheadorgans. A. Benites-Palomino et al. (2026) described a new, extinct species of dwarf sperm whale from the Upper Miocene #PiscoFormation in #Peru. In #Scaphokogia #huachafo, the cranial asymmetry is exceptionally well-developed. The authors do not interpret this as an evolutionary intermediate stage on the stem lineage leading to modern sperm whales, but rather as a very distinct unique specialization, one that points to a #benthic (bottom-dwelling) #lifestyle characterized by increased ventral #neckflexibility. This represents the most extreme morphological cranial adaptation known among cetaceans, and, researchers suspect, possibly even among all mammals. © #StefanFWirth, November 2026, Berlin Please support my science communication—it is much needed: https://t.co/4nN4eRHB6I Reference: A. Benites-Palomino et al. (2026): https://t.co/kfpYA0bBn3 #Figure: Original figure from the paper cited above: #Holotype #skull of Scaphokogia huachafo: MUSM 972 in dorsal (a–c), right lateral (d–f), and ventral (g–i) views, shown as the specimen (a, d, g), schematic drawings (b, e, h), and segmented 3D surface reconstructions (c, f, i). Dotted red lines indicate the main cranial axis. Creative Commons Attribution 4.0 International License, https://t.co/etQ1SDmkZS

wirthstef's tweet photo. Regarding an #extinct, newly described #species of toothed #whale from the late #Miocene in present-day Peru, which is distinguished by unique #cranialfeatures.

Bilateral symmetry is the most significant #evolutionaryinnovation (#apomorphy) of the #Bilateria. It facilitated a substantial radiation of species within both the Protostomia and Deuterostomia. Such #radiation is invariably accompanied by the formation of #ecologicalniches, leading to the evolution of #specific #adaptations to particular environmental conditions. #Asymmetries have #evolved across a wide variety of organismal groups, enabling them to adopt unconventional lifestyles. Examples include flatfish (#Pleuronectiformes) and, the focus here, whales. In connection with their fully #aquatic existence and the necessity for social #communication and orientation within this environment, sound-producing organs have evolved in the forehead region of whales. In toothed whales, these are associated with cranial asymmetries, which are particularly pronounced in #spermwhales (#Physeteroidea). Their skulls exhibit a leftward shift of the right #facialbones, including the #premaxilla and #nasalbone, along with the development of a cavity in the supracranial region that houses the whale’s #foreheadorgans.

A. Benites-Palomino et al. (2026) described a new, extinct species of dwarf sperm whale from the Upper Miocene #PiscoFormation in #Peru. In #Scaphokogia #huachafo, the cranial asymmetry is exceptionally well-developed. The authors do not interpret this as an evolutionary intermediate stage on the stem lineage leading to modern sperm whales, but rather as a very distinct unique specialization, one that points to a #benthic (bottom-dwelling) #lifestyle characterized by increased ventral #neckflexibility. This represents the most extreme morphological cranial adaptation known among cetaceans, and, researchers suspect, possibly even among all mammals.

© #StefanFWirth, November 2026, Berlin

Please support my science communication—it is much needed:
https://t.co/4nN4eRHB6I

Reference:
A. Benites-Palomino et al. (2026):
https://t.co/kfpYA0bBn3

#Figure:
Original figure from the paper cited above: #Holotype #skull of Scaphokogia huachafo:
MUSM 972 in dorsal (a–c), right lateral (d–f), and ventral (g–i) views, shown as the specimen (a, d, g), schematic drawings (b, e, h), and segmented 3D surface reconstructions (c, f, i). Dotted red lines indicate the main cranial axis.

Creative Commons Attribution 4.0 International License, https://t.co/etQ1SDmkZS

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