Histological discovery onacanthodian scales from the Famennian of Belgium

Derycke, Claire; Chancogne-Weber, Christiane

doi:10.1016/s0016-6995(95)80082-4

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…A similar surface ornamentation like the small tubercles of actinopterygian ganoine occurs in few acanthodians (Derycke and Chancogne-Weber, 1995;Märss, 2006: Acanthodes-type). The surfaces of acanthodian scales show either different ornamentation or no structure (smooth), reaching from hexagonal arrangements in Cheiracanthus, more irregular structures to small tubercles (Märss, 2006: fig.…”

Section: Histologymentioning

confidence: 84%

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Schultze

2016

Comptes Rendus Palevol

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a b s t r a c tGanoine is a different enamel from "true" enamel. The crystallites end in the middle of the projection of epidermal cell onto the ganoine surface. In contrast, "true" enamel shows the borders of the hexagonal epidermal cells. Cosmine is a combination of tissues ("true" enamel and dentine) and a structure (the pore-canal system). The pore-canal system opens in regular arranged pores on the scale surface and has a network of horizontal canals (mesh canals). Cosmine is limited to sarcopterygians possibly above actinistians and onychodonts, ganoine to actinopterygians. -Actinopterygian scales possess a narrow peg, an anterodorsal extended corner and ganoine either as overlapping or as multilayered enamel, whereas sarcopterygian scales have a broad based peg, no extended anterodorsal corner with two exceptions, but sometimes an anteroventral extension and cosmine. -The genera Andreolepis, Dialipina, Naxilepis, Terenolepis, Ligulalepis and Orvikuina are actinopterygians based on their scale characters. Additionally, Guiyu, Meemannia, Achoania and Psarolepis possess actinopterygian features. According to its scale characters Lophosteus is a stem osteichthyan.

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Section: Histologymentioning

confidence: 84%

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Schultze

2016

Comptes Rendus Palevol

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“…Rounded regularly organised tubercles (Fig. 6.5) indicate the presence of ganoin (Gayet and Meunier, 1986;Derycke and Chancogne-Webber, 1995).…”

Section: Thrinacodus Tranquillusmentioning

confidence: 99%

Famennian chondrichthyan microremains from Morocco and Sardinia

et al. 2008

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New material from the Famennian of Morocco in the southern Maider comprises chondrichthyan teeth (Thrinacodus, Cobelodus,\ud Denaea, Stethacanthus), actinopterygian remains (scales, teeth and hemilepidotrichium) and one acanthodian scale. The absence of crushing\ud teeth suggests deeper water environments for the Maider Basin than the Tafilalt Basin. Vertebrate microremains from the Famennian of Sardinia,\ud including Siamodus and Jalodus teeth, are illustrated and described. Ichthyofaunal relationships of the North Gondwanan platform during the\ud Famennian are examined

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“…Superimposed layers of enamel, the classic histological definition of ganoine (Goodrich, 1907), have been reported in 'acanthodians' (Richter and Smith, 1995), although successive layers of enamel are separated by dentine in Acanthodes (Richter et al, 1999). Likewise, the microscopic tubercles visible on the external surface of actinopt enamel, and once thought unique to that group, are also found in 'acanthodians' (Derycke and Chancogne-Weber, 1995).…”

Section: Actinopterygian Synapomorphiesmentioning

confidence: 88%

A reappraisal of the origin and basal radiation of the Osteichthyes

Friedman

Brazeau

2010

Journal of Vertebrate Paleontology

173

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ABSTRACT-The earliest Actinoptergyii (ray-finned fishes) and Sarcopterygii (lobe-finned fishes) have been studied intensely, and a consistent picture of interrelationships has begun to emerge for the latter. In contrast, there has been minimal documentation of the pattern of character acquisition leading to the osteichthyan crown. We review the synapomorphies proposed for various levels within osteichthyan phylogeny (total group; Acanthodes + crown group; crown group; Sarcoptergyii; Actinopterygii), confirming some, rejecting others, and making new additions. This distribution of characters is used to interpret the placement of problematic Siluro-Devonian genera traditionally assigned to Actinopterygii, and suggests these taxa are stem osteichthyans. Earlier placements of these forms within the crown are symptomatic of taxonomies based on unpolarized similarities rather than synapomorphies."The purpose of this paper is, first, to consider certain character complexes possessed in common by the early actinopterygians, crossopterygians and dipnoans and, second, to attempt some understanding of the basic osteichthyan radiation." Schaeffer (1968:207)

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Histological discovery onacanthodian scales from the Famennian of Belgium

Cited by 7 publications

References 3 publications

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Famennian chondrichthyan microremains from Morocco and Sardinia

A reappraisal of the origin and basal radiation of the Osteichthyes

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