Comparative Morphology of the Mammalian Mandible in Relation to Food Habit

Hoshi, Hiroshi

doi:10.2535/ofaj1936.48.5_333

Cited by 5 publications

(7 citation statements)

References 1 publication

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“…Oral mastication in vertebrates is well known in mammals but similar feeding mechanisms seemingly have arisen numerous times in vertebrate evolution as in hadrosaur dinosaurs (Erickson et al., 2012) and stingrays (Kolmann et al., 2016). The elongated and high coronoid process is also a character commonly associated with mastication in tetrapods, for example, in ungulates (Hoshi, 1971) and ceratopsian dinosaurs (Ostrom, 1966). Tooth arrangement on the vomers and prearticulars along with possible masticatory jaw movements gave rise to the interpretation of pycnodontiform jaws as a grinding mill (Kriwet, 2001a) where prey was processed with increased efficiency compared to ginglymodians and dapediiforms.…”

Section: Discussionmentioning

confidence: 99%

Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade

Cawley

Marramà

Carnevale

et al. 2021

Ecology and Evolution

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†Pycnodontiformes was a successful lineage of primarily marine fishes that broadly diversified during the Mesozoic. They possessed a wide variety of body shapes and were adapted to a broad range of food sources. Two other neopterygian clades possessing similar ecological adaptations in both body morphology (†Dapediiformes) and dentition (Ginglymodi) also occurred in Mesozoic seas. Although these groups occupied the same marine ecosystems, the role that competitive exclusion and niche partitioning played in their ability to survive alongside each other remains unknown. Using geometric morphometrics on both the lower jaw (as constraint for feeding adaptation) and body shape (as constraint for habitat adaptation), we show that while dapediiforms and ginglymodians occupy similar lower jaw morphospace, pycnodontiforms are completely separate. Separation also occurs between the clades in body shape so that competition reduction between pycnodontiforms and the other two clades would have resulted in niche partitioning. Competition within pycnodontiforms seemingly was reduced further by evolving different feeding strategies as shown by disparate jaw shapes that also indicate high levels of plasticity. Acanthomorpha was a teleostean clade that evolved later in the Mesozoic and which has been regarded as implicated in driving the pycnodontiforms to extinction. Although they share similar body shapes, no coeval acanthomorphs had similar jaw shapes or dentitions for dealing with hard prey like pycnodontiforms do and so their success being a factor in pycnodontiform extinction is unlikely. Sea surface temperature and eustatic variations also had no impact on pycnodontiform diversity patterns according to our results. Conversely, the occurrence and number of available reefs and hardgrounds as habitats through time seems to be the main factor in pycnodontiform success. Decline in such habitats during the Late Cretaceous and Palaeogene might have had deleterious consequences for pycnodontiform diversity. Acanthomorphs occupied the niches of pycnodontiforms during the terminal phase of their existence.

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Section: Discussionmentioning

confidence: 99%

Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade

Cawley

Marramà

Carnevale

et al. 2021

Ecology and Evolution

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“…Similar observations were made by Raghavan, (1964) in dog, Sebestiani and Fishbeck, (2005) in domestic cat and Tiwari et al, (2011) in tiger. In some species such as bear, it is divided into upper and lower parts by a low crest (Hoshi, 1971). Medially, the vertical ramus presented mandibular foramen (Fig.…”

Section: Resultsmentioning

confidence: 99%

Gross and Morphometrical Studies on Mandible of Civet Cat (Viverricula indica)

Suri¹,

Sasan²,

Sarma³

2018

Int.J.Curr.Microbiol.App.Sci

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“…In the cat, the arteries for the eye and accessory structures arise from this network as do also the rami retis, which pass through the fissura orbitalis to connect with the circulus arteriosus cerebri. At the same time, the maxillary artery itself, being traceable through this network as a stronger vessel, leads the a. infraorbitalis [28].…”

Section: Topographical Considerationsmentioning

confidence: 98%

“…It must be taken into account that the morphology of the mandible is conditioned by food habits [28]. As a carnivore, the cat has a mastication pattern consisting of an up and down or hinge movement of the mandible.…”

Section: Mandibular Teethmentioning

confidence: 99%

“…Their TMJ lies on or close to the same plane as that of the lower dentition, with molars designed for crushing and slicing [25]. In contrast, in the herbivore group, which includes the Ungulates, the main action consists of a grinding movement of the mandible [28], as their TMJ lies above the occlusal plane of the maxillary dentition. In carnivores, the combination of a tall coronoid process and extension of the skull posterior to the TMJ permits both a large gape and a powerful bite.…”

Section: Mandibular Teethmentioning

confidence: 99%

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The Cat Mandible (I): Anatomical Basis to Avoid Iatrogenic Damage in Veterinary Clinical Practice

Lombardero

Alonso-Peñarando

Yllera

2021

Animals

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Cats are one of our favourite pets in the home. They differ considerably from dogs but are usually treated clinically as small dogs, despite some anatomical and physiological dissimilarities. Their mandible is small and has some peculiarities relative to the dentition (only three incisors, a prominent canine, two premolars and one molar); a conical and horizontally oriented condyle, and a protudent angular process in its ventrocaudal part. Most of the body of the mandible is occupied by the mandibular dental roots and the mandibular canal that protects the neurovascular supply: the inferior alveolar artery and vein, and the inferior alveolar nerve that exits the mandible rostrally as the mental nerves. They irrigate and innervate all the teeth and associated structures such as the lips and gingiva. Tooth roots and the mandibular canal account for up to 70% of the volume of the mandibular body. Consequently, when fractured it is difficult to repair without invading the dental roots or vascular structures. Gaining a comprehensive anatomical knowledge and good clinical practice (such as image diagnosis before and post-surgery) will help in the awareness and avoidance of iatrogenic complications in day-to-day feline clinical practice.

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Comparative Morphology of the Mammalian Mandible in Relation to Food Habit

Cited by 5 publications

References 1 publication

Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade

Rise and fall of †Pycnodontiformes: Diversity, competition and extinction of a successful fish clade

Gross and Morphometrical Studies on Mandible of Civet Cat (Viverricula indica)

The Cat Mandible (I): Anatomical Basis to Avoid Iatrogenic Damage in Veterinary Clinical Practice

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