The Mongolepidida: Scale structure and systematic position

Karatajūtē-Talimaa, Valentina

doi:10.1016/s0016-6995(95)80083-2

Cited by 19 publications

(26 citation statements)

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“…mongolepidids) and better characterized acanthodian‐type spines (e.g. sinocanthids) in the late Llandovery (Karatajute‐Talimaa, 1995; Janvier 1996; Sansom et al. 2005; Zhao and Zhu 2007; Žigaite et al.…”

Section: Early To Mid‐palaeozoic Eventsmentioning

confidence: 99%

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Friedman¹,

Sallan²

2012

Palaeontology

195

230

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: Fishes include more than half of all living animals with backbones, but large‐scale palaeobiological patterns in this assemblage have not received the same attention as those for terrestrial vertebrates. Previous surveys of the fish record have generally been anecdotal, or limited either in their stratigraphic or in their taxonomic scope. Here, we provide a broad overview of the Phanerozoic history of fish diversity, placing a special emphasis on intervals of turnover, evolutionary radiation, and extinction. In particular, we provide in‐depth reviews of changes during, and ecological and evolutionary recovery after, the end‐Devonian (Hangenberg) and Cretaceous–Palaeogene (K–Pg) extinctions.

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Section: Early To Mid‐palaeozoic Eventsmentioning

confidence: 99%

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Friedman¹,

Sallan²

2012

Palaeontology

195

230

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“…2009) and the early Darriwilian occurrence of Tantalepis is populated sporadically by a number of other disarticulated remains that have been referred to the chondrichthyans with a greater (for example Elegestolepis and Tuvalepis ; Karatajūtė‐Talimaa 1973; Novitskaya and Karatajūtė‐Talimaa 1986; Žigaitė and Karatajūtė‐Talimaa 2008) or lesser (for example: mongolepids and sinacanthids, Karatajūtė‐Talimaa et al. 1990; Karatajūtė‐Talimaa and Novitskaya 1992; Karatajūtė‐Talimaa 1995; Zhu 1998; Sansom et al. 2000, 2005) degrees of confidence, based largely upon the possession of neck canals by the former and their absence in the latter.…”

Section: The Suprageneric Assignment Of Tantalepismentioning

confidence: 99%

Chondrichthyan‐like scales from the Middle Ordovician of Australia

Sansom¹,

Davies

Coates³

et al. 2012

Palaeontology

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Microvertebrate sampling of the Stairway Sandstone (Darriwilian, Middle Ordovician, central Australia) has yielded scales that are chondrichthyan-like in their overall construction, and Tantalepis gatehousei gen. et sp. nov. is erected here to describe these specimens. Tantalepis gatehousei gen. et sp. nov. is the stratigraphically oldest microsquamous taxon described thus far, and the 'shark-like' appearance of the scales may extend the chondrichthyan lineage back into the Middle Ordovician. The presence of 'shark-like' scales in the fossil record some 50 myr prior to the first articulated chondrichthyan body fossils and 44 myr before the first clearly identifiable chondrichthyan teeth suggests there is a considerable scope for the recovery of articulated specimens with which to document the early history of crown gnathostomes. Traditional hypotheses of phylogenetic relationships among early jawed vertebrates were recently challenged by the proposal of a radically different tree topology. However, the development of a new data set specifically addressing scalebased characters is required before taxa such as Tantalepis, that are based upon disarticulated remains alone, can be firmly placed within the emerging, revised, evolutionary narrative.

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“…Such a scale grows larger and thicker during the life span of the fish and is not shed. Whereas modern chondrichthyans all have monoodontode scales, several kinds of polyodontode scales have been reported in early chondrichthyans [16]–[21]. Polyodontode scales have also been discovered in osteostracans and heterostracans, two groups of extinct jawless vertebrates that, like the thelodonts, are members of the jawed vertebrate stem group (Figure 1) [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Scales and Tooth Whorls of Ancient Fishes Challenge Distinction between External and Oral ‘Teeth’

Sanchez

Blom

et al. 2013

PLoS ONE

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The debate about the origin of the vertebrate dentition has been given fresh fuel by new fossil discoveries and developmental studies of extant animals. Odontodes (teeth or tooth-like structures) can be found in two distinct regions, the ‘internal’ oropharyngeal cavity and the ‘external’ skin. A recent hypothesis argues that regularly patterned odontodes is a specific oropharyngeal feature, whereas odontodes in the external skeleton lack this organization. However, this argument relies on the skeletal system of modern chondrichthyans (sharks and their relatives), which differ from other gnathostome (jawed vertebrate) groups in not having dermal bones associated with the odontodes. Their external skeleton is also composed of monoodontode 'placoid scales', whereas the scales of most early fossil gnathostomes are polyodontode, i.e. constructed from several odontodes on a shared bony base. Propagation phase contrast X-ray Synchrotron microtomography (PPC-SRµCT) is used to study the polyodontode scales of the early bony fish Andreolepis hedei. The odontodes constructing a single scale are reconstructed in 3D, and a linear and regular growth mechanism similar to that in a gnathostome dentition is confirmed, together with a second, gap-filling growth mechanism. Acanthodian tooth whorls are described, which show that ossification of the whorl base preceded and probably patterned the development of the dental lamina, in contrast to the condition in sharks where the dental lamina develops early and patterns the dentition.The new findings reveal, for the first time, how polyodontode scales grow in 3D in an extinct bony fish. They show that dentition-like odontode patterning occurs on scales and that the primary patterning unit of a tooth whorl may be the bony base rather than the odontodes it carries. These results contradict the hypothesis that oropharyngeal and external odontode skeletons are fundamentally separate and suggest that the importance of dermal bone interactions to odontode patterning has been underestimated.

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The Mongolepidida: Scale structure and systematic position

Cited by 19 publications

References 0 publications

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Chondrichthyan‐like scales from the Middle Ordovician of Australia

Scales and Tooth Whorls of Ancient Fishes Challenge Distinction between External and Oral ‘Teeth’

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