On the skeleton of the hyoid arch in Rays and Skates
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Developmental evidence for serial homology of the vertebrate jaw and gill arch skeleton
Gegenbaur's classical hypothesis of jaw-gill arch serial homology is widely cited, but remains unsupported by either palaeontological evidence (for example, a series of fossils reflecting the stepwise transformation of a gill arch into a jaw) or developmental genetic data (for example, shared molecular mechanisms underlying segment identity in the mandibular, hyoid and gill arch endoskeletons)....
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The pharyngeal skeleton is a key vertebrate anatomical system in debates on the origin of jaws and gnathostome (jawed vertebrate) feeding. Furthermore, it offers considerable potential as a source of phylogenetic data. Well-preserved examples of pharyngeal skeletons from stem-group gnathostomes remain poorly known. Here, we describe an articulated, nearly complete pharyngeal skeleton in an Earl...
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Batoidfishes are one of the most important groups of by-catch in the Persian Gulf. This survey was done for identification of skates and rays, inhabiting in the Persian Gulf and Omen Sea waters (Hormuzgan Province). The samples were collected by bottom trawl. The identified Skates were Rhinbatus granulatus, R. punctifer and Rhina ancylostoma (Rhinobatidae) and Rhynchobatus djiddensis (Rhynchoba...
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Little is known about the spatiotemporal requirement of Hox gene patterning activity in vertebrates. In Hoxa2 mouse mutants, the hyoid skeleton is replaced by a duplicated set of mandibular and middle ear structures. Here, we show that Hoxa2 is selectively required in cranial neural crest cells (NCCs). Moreover, we used a Cre-ERT2 recombinase system to induce a temporally controlled Hoxa2 delet...
متن کاملA shared role for sonic hedgehog signalling in patterning chondrichthyan gill arch appendages and tetrapod limbs.
Chondrichthyans (sharks, skates, rays and holocephalans) possess paired appendages that project laterally from their gill arches, known as branchial rays. This led Carl Gegenbaur to propose that paired fins (and hence tetrapod limbs) originally evolved via transformation of gill arches. Tetrapod limbs are patterned by asonic hedgehog(Shh)-expressing signalling centre known as the zone of polari...
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تاریخ انتشار 2006