Post-ovipositional development of the monocled cobra, Naja kaouthia (Serpentes: Elapidae)

Jackson, Kate

doi:10.1078/0944-2006-00077

Cited by 42 publications

(70 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The timing for the establishment of amniote hatchling functional dentitions is well established. In crocodilians (extant sister taxon to Dinosauria) it typically occurs between 42% and 52% of the total incubation period (3) and at >51% in squamates (64,65,(67)(68)(69). In chicken (Gallus gallus domesticus), living dinosaurs, teeth primordia-none of which become functional-appear at 66% through incubation (98).…”

Section: Methodsmentioning

confidence: 99%

Dinosaur incubation periods directly determined from growth-line counts in embryonic teeth show reptilian-grade development

Erickson

Zelenitsky

Kay

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Birds stand out from other egg-laying amniotes by producing relatively small numbers of large eggs with very short incubation periods (average 11-85 d). This aspect promotes high survivorship by limiting exposure to predation and environmental perturbation, allows for larger more fit young, and facilitates rapid attainment of adult size. Birds are living dinosaurs; their rapid development has been considered to reflect the primitive dinosaurian condition. Here, nonavian dinosaurian incubation periods in both small and large ornithischian taxa are empirically determined through growthline counts in embryonic teeth. Our results show unexpectedly slow incubation (2.8 and 5.8 mo) like those of outgroup reptiles. Developmental and physiological constraints would have rendered tooth formation and incubation inherently slow in other dinosaur lineages and basal birds. The capacity to determine incubation periods in extinct egg-laying amniotes has implications for dinosaurian embryology, life history strategies, and survivorship across the Cretaceous-Paleogene mass extinction event.Dinosauria | teeth | embryology | Neornithes | extinction

show abstract

Section: Methodsmentioning

confidence: 99%

Dinosaur incubation periods directly determined from growth-line counts in embryonic teeth show reptilian-grade development

Erickson

Zelenitsky

Kay

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…Investigations of craniofacial development in a complete series of embryos from oviposition up to hatching are still relatively rare (e.g. Jackson, ; Boughner et al. ; Boback et al.…”

Section: Introductionmentioning

confidence: 99%

The development of the osteocranium in the snake Psammophis sibilans (Serpentes: Lamprophiidae)

2019

View full text Add to dashboard Cite

Non‐avian reptiles are good models to investigate structural and developmental differences between amniotes. Investigations of craniofacial development in a complete series of embryos from oviposition up to hatching are still relatively rare. Consideration of a complete series can reveal developmental events that were previously missed, and thus correct or confirm theories about developmental events. The Egyptian Sand snake, Psammophis sibilans, has been a key species in descriptions of the snake skull development. However, published work was based on a limited sample of specimens collected from the wild. Here, we supplement previous descriptions with an illustrated account of skull development in P. sibilans based on a staged series of embryos and histological sections. Our findings largely agree with those of previous authors, although we record differences in developmental timing, confirming the presence of an egg tooth in this species. We add further observations on the enigmatic fenestra X, showing that it closes rather than merging with the prootic notch. Our observations revealed the likely contribution of the tectum posterius to the occipital roof, the presence of an internal carotid foramen (possibly transitory or variable), and the formation of the initial laterosphenoid pillar.

show abstract

“…In common with other reptiles (e.g., avian Gallus gallus [Jollie, 1957;Murray, 1963;Hamilton, 1965]; squamates Elaphe obsoleta [Haluska and Alberch, 1983], Lacerta vivipara [Rieppel, 1992], and Naja kaouthia [Jackson, 2002]; and turtles Chelydra serpentine and Apalone spinifera [Rieppel, 1993c;Sheil, 2003;Sheil and Greenbaum, 2005]), the dermatocranium initiates ossification prior to the endoskeletal system, in most cases beginning with the pterygoid, dentary, angular, maxilla, and premaxilla. For Alligator mississippiensis, there is a convenient relationship between the early development of tooth-bearing elements (at FS 17-18) and the previously established dentition (at FS 14;Ferguson, 1986, 1990).…”

Section: Pattern Of Dermal Skeletogenesismentioning

confidence: 99%

Development of the dermal skeleton in Alligator mississippiensis (Archosauria, Crocodylia) with comments on the homology of osteoderms

Vickaryous

Hall

2008

Journal of Morphology

179

248

View full text Add to dashboard Cite

The dermal skeleton (5 exoskeleton) has long been recognized as a major determinant of vertebrate morphology. Until recently however, details of tissue development and diversity, particularly among amniotes, have been lacking. This investigation explores the development of the dermatocranium, gastralia, and osteoderms in the American alligator, Alligator mississippiensis. With the exception of osteoderms, elements of the dermal skeleton develop early during skeletogenesis, with most initiating ossification prior to mineralization of the endoskeleton. Characteristically, circumoral elements of the dermatocranium, including the pterygoid and dentigerous elements, are among the first to form. Unlike other axially arranged bones, gastralia develop in a caudolateral to craniomedial sequence. Osteoderms demonstrate a delayed onset of development compared with the rest of the skeleton, not appearing until well after hatching. Osteoderm development is asynchronous across the body, first forming dorsally adjacent to the cervical vertebrae; the majority of successive elements appear in caudal and lateral positions. Exclusive of osteoderms, the dermal skeleton initiates osteogenesis via intramembranous ossification. Following the establishment of skeletal condensations, some preossified spicules become engorged with many closely packed clusters of chondrocyte-like cells in a bone-like matrix. This combination of features is characteristic of chondroid bone, a tissue otherwise unreported among nonavian reptiles. No secondary cartilage was identified in any of the specimens examined. With continued growth, dermal bone (including chondroid bone) and osteoid are resorbed by multinucleated osteoclasts. However, there is no evidence that these cells contribute to the rugose pattern of bony ornamentation characteristic of the crocodylian dermatocranium. Instead, ornamentation develops as a result of localized concentrations of bone deposited by osteoblasts. Osteoderms develop in the absence of osteoblastic cells, osteoid, and periosteum; bone develops via the direct transformation of the preexisting dense irregular connective tissue. This mode of bone formation is identified as metaplasia. Importantly, it is also demonstrated that osteoderms are not histologically uniform but involve a range of tissues including calcified and uncalcified dense irregular connective tissue. Between taxa, not all osteoderms develop by homologous processes. However, it is concluded that all osteoderms may share a deep homology, connected by the structural and skeletogenic properties of the dermis.

show abstract

Post-ovipositional development of the monocled cobra, Naja kaouthia (Serpentes: Elapidae)

Cited by 42 publications

References 17 publications

Dinosaur incubation periods directly determined from growth-line counts in embryonic teeth show reptilian-grade development

Dinosaur incubation periods directly determined from growth-line counts in embryonic teeth show reptilian-grade development

The development of the osteocranium in the snake Psammophis sibilans (Serpentes: Lamprophiidae)

Development of the dermal skeleton in Alligator mississippiensis (Archosauria, Crocodylia) with comments on the homology of osteoderms

Contact Info

Product

Resources

About