An Integrative View of Lepidosaur Cranial Anatomy, Development, and Diversification

Díaz, Raúl E.; Trainor, Paul A.

doi:10.1007/978-3-319-93560-7_9

Cited by 7 publications

(13 citation statements)

References 68 publications

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“…By 157dpo (Figure F), in addition to the expansion of skeletal elements present in Figure E, we see formation of the premaxilla (PMX), maxilla (MX) and the egg tooth (ET). In the lower jaw, we see the appearance of the angular (ANG) and the surangular (SA) investing Meckel's cartilage along its dorsal and ventrolateral margin posterior to the dentary, consistent with more detailed descriptions of the developing veiled chameleon chondro‐ and osteocranium …”

Section: Resultssupporting

confidence: 77%

“…Proximal to this tract of nerves, midway between the ophthalmic and the mandibular series of neurons, a maxillary branch of neurons extends anterodorsally but ventral to the orbit (Figure C,D). This differs from the large ganglion with three branches generally observed in mammals such as mouse and humans by having a distinct ophthalmic branch and a ventral branch which gives rise to a maxillary and mandibular component as seen in reptiles such as chicken, alligator and the African house snake . CNVII/VIII extend toward Ph2.…”

Section: Resultsmentioning

confidence: 75%

“…F, We see further cranioskeletal development with the appearance of an ossified premaxilla (PMX), maxilla (MX), egg teeth (ET) in the face and an enlarged dentary (D), surangular (SA), and angular (ANG) in the lower jaw. For a more detailed examination of the developing cranium see Diaz and Trainor (2019)…”

Section: Resultsmentioning

confidence: 99%

“…This differs from the large ganglion with three branches generally observed in mammals such as mouse and humans [44][45][46] by having a distinct ophthalmic branch and a ventral branch which gives rise to a maxillary and mandibular component as seen in reptiles such as chicken, alligator and the African house snake. [47][48][49] CNVII/VIII extend toward Ph2. Ph3 is innervated by CNIX, while Ph4 is innervated by CNX.…”

Section: Neuronal Differentiationmentioning

confidence: 99%

“…54 F, We see further cranioskeletal development with the appearance of an ossified premaxilla (PMX), maxilla (MX), egg teeth (ET) in the face and an enlarged dentary (D), surangular (SA), and angular (ANG) in the lower jaw. For a more detailed examination of the developing cranium see Diaz and Trainor (2019) 49 observed in mammals. 50,51 Of interest, the pineal organ (PO) is also TuJ1 positive, having begun to develop adjacent to the dorsal surface of the diencephalon (EP; Figure 6D).…”

Section: Neuronal Differentiationmentioning

confidence: 99%

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Filling in the phylogenetic gaps: Induction, migration, and differentiation of neural crest cells in a squamate reptile, the veiled chameleon (Chamaeleo calyptratus)

Díaz

Shylo

Roellig

et al. 2019

Developmental Dynamics

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Neural crest cells comprise a migratory progenitor cell population that differentiate into cell types such as neurons and glia of the peripheral nervous system, pigment cells, hormone secreting cells in glands, and skeletal and connective tissue in the head, thus making important contributions to most tissues and organs throughout the vertebrate body. The evolutionary appearance of neural crest cells is considered synonymous with the origin of vertebrates and their subsequent diversification and radiation. While the comparative biology of neural crest cells has been studied for a century and a half beginning with their discovery by Wilhelm His in 1868, most of our understanding of their development and function has come from a small number of species. Thus, critical gaps exist in our understanding of how neural crest cells mediate evolution and development. This is particularly true with respect to squamate reptiles (lizards, snakes, amphisbaenians), which account for approximately one‐third of all living tetrapods. Here, we present veiled chameleons (Chamaeleo calyptratus) as a model system for studying neural crest cell development in squamates. Chameleons exhibit various morphological specializations associated with an arboreal lifestyle that may have been facilitated through neural crest cells acting as a conduit for evolutionary change.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Neuronal Differentiationmentioning

confidence: 99%

Section: Neuronal Differentiationmentioning

confidence: 99%

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Filling in the phylogenetic gaps: Induction, migration, and differentiation of neural crest cells in a squamate reptile, the veiled chameleon (Chamaeleo calyptratus)

Díaz

Shylo

Roellig

et al. 2019

Developmental Dynamics

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Comparative development of limb musculature in phylogenetically and ecologically divergent lizards

Díaz

Taylor-Diaz

Trainor

et al. 2021

Developmental Dynamics

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Background Squamate reptiles (lizards, snakes, and amphisbaenians) exhibit incredible diversity in their locomotion, behavior, morphology, and ecological breadth. Although they often are used as models of locomotor diversity, surprisingly little attention has been given to muscle development in squamate reptiles. In fact, the most detailed examination was conducted almost 80 years ago and solely focused on the proximal limb regions. Herein, we present forelimb and hindlimb muscle morphogenesis data for three lizard species with different locomotion and feeding strategies: the desert grassland whiptail lizard, the central bearded dragon, and the veiled chameleon. This study fills critical gaps in our understanding of muscle morphogenesis in squamate reptiles and presents a comparative and temporospatial analysis of muscle development. Results Our results reveal a conserved pattern of early muscle development among lizards with different adult morphologies and ecologies. The variations that exist are concentrated in distal regions, particularly the specialized autopodia of chameleons, where differentiation of muscles associated with the digits is delayed. Conclusions The chameleon autopod provides an example of major evolutionary modifications to the skeleton with only minor disruption of the conserved order and pattern of limb muscle development. This robustness of muscle patterning facilitates the evolution of extreme yet functional phenotypes.

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A Look in to the Neurocranium of Living and Extinct Lepidosauria

Paulina‐Carabajal

Jiménez-Huidobro²,

Triviño³

et al. 2022

Paleoneurology of Amniotes

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An Integrative View of Lepidosaur Cranial Anatomy, Development, and Diversification

Cited by 7 publications

References 68 publications

Filling in the phylogenetic gaps: Induction, migration, and differentiation of neural crest cells in a squamate reptile, the veiled chameleon (Chamaeleo calyptratus)

Filling in the phylogenetic gaps: Induction, migration, and differentiation of neural crest cells in a squamate reptile, the veiled chameleon (Chamaeleo calyptratus)

Comparative development of limb musculature in phylogenetically and ecologically divergent lizards

A Look in to the Neurocranium of Living and Extinct Lepidosauria

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