Results 41 to 50 of about 1,258 (160)
The conundrum of pharyngeal teeth origin: the role of germ layers, pouches, and gill slits
Biological Reviews, Volume 97, Issue 1, Page 414-447, February 2022., 2022 ABSTRACT There are several competing hypotheses on tooth origins, with discussions eventually settling in favour of an ‘outside‐in’ scenario, in which internal odontodes (teeth) derived from external odontodes (skin denticles) in jawless vertebrates. The evolution of oral teeth from skin denticles can be intuitively understood from their location at ...
Ann Huysseune +2 more
wiley +1 more source
Using the swimbladder as a respiratory organ and/or a buoyancy structure—Benefits and consequences
Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, Volume 335, Issue 9-10, Page 831-842, November 1, 2021., 2021 Graphical abstract Abstract A swimbladder is a special organ present in several orders of Actinopterygians. As a gas‐filled cavity it contributes to a reduction in overall density, but on descend from the water surface its contribution as a buoyancy device is very limited because the swimbladder is compressed by increasing hydrostatic pressure.
Bernd Pelster
wiley +1 more source
Surface Topography and Ultrastructure of the Spectacular Cells in the Eyes of Land and Sea Snakes (Squamata, Reptilia): Functional Adaptations of Micro-Ornamentation. [PDF]
J MorpholABSTRACT Although the surface micro‐ornamentation of the scales within the skin of snakes has been the subject of many previous studies, there has been little work done on the spectacle, a protective (keratinised) goggle separated from the underlying cornea by a sub‐spectacular space. The surface ultrastructure of the “Oberhäutchen” of the spectacle is
Collin HB +6 more
europepmc +2 more sources
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, Volume 336, Issue 7, Page 554-561, November 2021., 2021 For the first time, the vtgI gene, absent in anurans, was characterized in caecilians and urodeles (Panel a). The different expression levels of vtg genes in female liver transcriptomes of Cynops orientalis suggested different functions (Panel b).
Federica Carducci +3 more
wiley +1 more source
Anatomy and histology of the spiral valve intestine in juvenile Australian lungfish, Neoceratodus forsteri [PDF]
, 2009 The Australian lungfish, Neoceratodus forsteri, is the only vertebrate that possesses a complete spiral valve intestine with pre-pyloric coiling. This study describes the anatomy and histology of the spiral valve intestine in juvenile N.
Joss, Jean +1 more
core +1 more source
Topological Analysis of the Brainstem of the Australian Lungfish Neoceratodus forsteri.
Brain, behavior and evolution, 2022 This paper presents a survey of the cell masses in the brainstem of the Australian lungfish Neoceratodus forsteri, based ontransversely cut Bodian-stained serial sections, supplemented by immunohistochemical data from the recent literature. This study is intended to serve a double purpose.
openaire +3 more sources
Studies on the Queensland Lungfish, Neoceratodus forsteri (Krefft). [PDF]
Australian Journal of Zoology, 1965 The lung of Neoceratodus forsteri consists of a single elongated sac dorsal to the gut and attached firmly along the dorsal mid-line in the region of the vertebral column. It communicates with the gut through the pneumatic duct which opens ventrolaterally via the glottis, on the right side of the pharynx.
openaire +1 more source
Frontiers in Neuroanatomy, 2018 Expression patterns of Nkx2.1 and Islet-1 (Isl1), which encode transcription factors that are key in the regionalization of the forebrain, were analyzed by combined immunohistochemical methods in young adult specimens of two lungfishes (Neoceratodus ...
Nerea Moreno +5 more
doaj +1 more source
Neoceratodus forsteri transcriptome
, 2017 Neoceratodus forsteri ...
Frédéric Delsuc (70930) +21 more
core +1 more source
, 2007 The permanent tooth plates of the Australian lungfish, Neoceratodus forsteri, are covered by enamel that develops initially in a similar manner to that of other vertebrates. As the enamel layer matures, it acquires several unusual characteristics. It has
Kemp, Anne, Barry, John C., Barry, John
core +1 more source