Data from: An early chondrichthyan and the evolutionary assembly of a shark body plan

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关键词：

computed tomography;Middle Devonian;gnathostome phylogeny;scales;Chondrichthyes;gill skeleton

DOI：

doi:10.5061/dryad.84mh3

摘要：

-chondrichthyans are severely under-sampled and strongly supports indications from isolated scales that the gnathostome crown group originated at the la

Data from: Histology and affinity of anaspids, and the early evolution of the vertebrate dermal skeleton

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关键词：

gnathostome;odontode;skeleton;anaspid;Gnathostomata;Histology;Anaspida;dermal

DOI：

doi:10.5061/dryad.k2qc4

摘要：

The assembly of the gnathostome bodyplan constitutes a formative episode in vertebrate evolutionary history, an interval in which the mineralized

Data from: microRNAs reveal the interrelationships of hagfish, lampreys, and gnathostomes and the nature of the ancestral vertebrate

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关键词：

organ;complexity;Vertebrata;homology;Evolution;cyclostomata

DOI：

doi:10.5061/dryad.pn7t4

摘要：

of microRNA expression patterns among lamprey, hagfish, and gnathostome organs, implying that the role of microRNAs within specific organs is coincident with thei

Data from: New findings in a 400 million-year-old Devonian placoderm shed light on jaw structure and function in basal gnathostomes

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jaw structure and function;basal gnathostome;High-resolutioin CT;Early Devonian;buchanosteid arthrodire;high-resolution 3D printing;Buchanosteid

DOI：

doi:10.5061/dryad.2qd07

摘要：

ween arthrodires and osteichthyans, and will help to clarify the sequence of character acquisition in the evolution of basal gnathostome groups. New details

Data from: Evolution of vertebrate postcranial complexity: axial skeleton regionalization and paired appendages in a Devonian jawless fish

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关键词：

Devonian;Axial skeleton regionalization;Early vertebrates;Evolution;Intromittent organs;Euphanerops longaevus;Petromyzon marinus

DOI：

doi:10.5061/dryad.1r634nj

摘要：

One of the major events in vertebrate evolution involves the transition from jawless (agnathan) to jawed (gnathostome) vertebrates, including

Data from: New information on Brindabellaspis stensioi Young, 1980, highlights morphological disparity in Early Devonian placoderms

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关键词：

Devonian;placoderms;Brindabellaspis stensioi;lateral line

DOI：

doi:10.5061/dryad.s353f

摘要：

y in unprecedented detail. Brindabellaspis has become a key taxon in discussions of early gnathostome phylogeny, and the question of placoderm monophyly versus

Data from: Resegmentation is an ancestral feature of the gnathostome vertebral skeleton

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关键词：

somites;vertebrae;Axial skeleton;Chondrichthyan;segmentation;Evolution

DOI：

doi:10.5061/dryad.b2rbnzs8s

摘要：

The vertebral skeleton is a defining feature of vertebrate animals. However, the mode of vertebral segmentation varies considerably between major lineages. In tetrapods, adjacent somite halves recombine to form a single vertebra through the process of ‘resegmentation’. In teleost fishes, there is considerable mixing between cells of the anterior and posterior somite halves, without clear resegmentation. To determine whether resegmentation is a tetrapod novelty, or an ancestral feature of jawed vertebrates, we tested the relationship between somites and vertebrae in a cartilaginous fish, the skate (Leucoraja erinacea). Using cell lineage tracing, we show that skate trunk vertebrae arise through tetrapod-like resegmentation, with anterior and posterior halves of each vertebra deriving from adjacent somites. We further show that tail vertebrae also arise through resegmentation, though with a duplication of the number of vertebrae per body segment. These findings resolve axial resegmentation as an ancestral feature of the jawed vertebrate body plan.