Abstract
The skeleton and inferred neurosensory system of the ancestral amniote provide a point of departure to trace neurosensory evolution in extinct stem-mammals that culminated in the origin of crown Mammalia. Early stem-mammal evolution mostly involved enhanced integration of skeletal elements for feeding and locomotion as they became apex predators. With the origin of Cynodontia, modifications of the dentition, oropharynx, and braincase suggest that mastication and olfaction had become major influences in stem-mammal evolution, probably through ontogenetic cascades triggered by expression of an expanded olfactory genome. With the origin of Mammaliaformes, brain size nearly doubled in response to further elaboration of the olfactory system, dentition, the elaboration of hair, all in the context of miniaturization of adult body size. One of the keys to understanding major features in stem-mammal evolution and the origin of Mammalia is the emergence of an unsurpassed ability to perceive and process olfactory and dietary information, and to diversify and exploit the fast-changing chemical environments they faced throughout much of their history. Whether through connectional invasions and epigenetic population matching, or some other developmental mechanism, hypertrophy in peripheral sensory arrays produced cascading influences on central organization. These led to emergence of the unique mammalian neocortex and to the physiological and behavioral repertoires that are so distinctive of mammals today.
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Abbreviations
- Ali :
-
Alisphenoid
- Alv :
-
Alveoli for the dentition
- Ang :
-
Angular
- Art :
-
Articular
- Bs :
-
Basisphenoid
- c :
-
Lower canine
- C :
-
Upper canine
- Cb :
-
Cerebellum
- choa:
-
Choana
- cr :
-
cheek tooth crown
- cve :
-
Cavum epipterycum
- D cond :
-
Condylar process of dentary
- D cor :
-
Coronoid process of dentary
- D ctx :
-
Dorsal cortex (endocast)
- Den :
-
Dentary
- D ang :
-
Angular process of dentary
- D ram :
-
Dentary ramus
- Ec :
-
Ectopterygoid
- Eoc :
-
Exoccipital
- Et 1-5 :
-
Ethmoid turbinals 1-5
- F ann :
-
Annular fissure
- F mag :
-
Foramen magnum
- Fr :
-
Frontal
- Fv :
-
Fenestra vestibuli
- Hyp :
-
Hypophysis (endocast)
- i :
-
1-4 Lower incisors
- I 1-3 :
-
Upper incisors
- iam :
-
Internal auditory meatus (endocast)
- II :
-
Cranial nerve II (endocast)
- Ju :
-
Jugal
- Lac :
-
Lacrimal
- m 1-3 :
-
Lower molars
- M 1-3 :
-
Upper molars
- Max :
-
Maxilla
- Mt :
-
Maxilloturbinal
- Nas :
-
Nasal
- Ncx :
-
Neocortex
- Nt :
-
Nasoturbinal
- Ob :
-
Olfactory bulb
- Ocx :
-
Olfactory (piriform) cortex
- Opl :
-
Optic lobes (endocast)
- p 1-5 :
-
Lower premolars
- P 1-2 :
-
Upper premolars
- Pa :
-
Parietal
- Pal :
-
Palatine
- Pet :
-
Petrosal
- Pin :
-
Pineal body (endocast)
- Pfl :
-
Paraflocculus (endocast)
- Pmx :
-
Premaxilla
- Prom :
-
Promontorium of petrosal
- Pt :
-
Pterygoid
- Qu :
-
Quadrate
- Re lam :
-
Reflected lamina of angular (=ectotympanic)
- Rf :
-
Rhinal fissure
- rt :
-
tooth root
- Smx :
-
Septomaxilla
- Soc :
-
Supraoccipital
- Spc :
-
Spinal cord (endocast)
- Sq :
-
Squamosal
- sss :
-
Superior sagittal sinus (endocast)
- Sv :
-
Sinus venosus
- V :
-
Cranial nerve V (endocast)
- Vo :
-
Vomer
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Rowe, T.B. (2023). Evolution of the Mammalian Neurosensory System: Fossil Evidence and Major Events. In: Dozo, M.T., Paulina-Carabajal, A., Macrini, T.E., Walsh, S. (eds) Paleoneurology of Amniotes . Springer, Cham. https://doi.org/10.1007/978-3-031-13983-3_10
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