A microstructural study of the ganoine tissue of selected lower vertebrates

Richter, Martha

doi:10.1006/zjls.1995.0023

Cited by 42 publications

(64 citation statements)

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“…1A, B; see Richter and Smith, 1995 for an extensive review). There appears always a sharp boundary to the underlying dentine.…”

Section: Histologymentioning

confidence: 98%

“…enamel. They (Friedman and Brazeau, 2010, p. 45) deny the distinction between the two kinds of enamel, and accept the occurrence of enamel in acanthodians (Richter and Smith, 1995;Richter et al, 1999) and in conodonts (Donoghue et al, 2006;Janvier, 1996). Still they accept enamel as a synapomorphy for osteichthyans, even though enamel unites Ischnacanthiformes, Acanthodiformes and Osteichthyes (Brazeau and Friedman, 2014, character 48 A in fig.…”

Section: Introductionmentioning

confidence: 95%

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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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“…1A, B; see Richter and Smith, 1995 for an extensive review). There appears always a sharp boundary to the underlying dentine.…”

Section: Histologymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 95%

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Schultze

2016

Comptes Rendus Palevol

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“…Enamel has a non-porous structure, relatively large crystals and a low organic component (e.g., Wang and Cerling, 1994;Kohn et al, 1999 and references therein). Ganoine is a type of enamel, a superficial hypermineralised tissue in scales of some Actinopterygii (Richter and Smith, 1995;Sire, 1995;Bruet et al, 2008;Domingo et al, 2009b).…”

Section: Samplesmentioning

confidence: 94%

Preservation of successive diagenetic stages in Middle Triassic bonebeds: Evidence from in situ trace element and strontium isotope analysis of vertebrate fossils

et al. 2015

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“…Richter and Smith [30] noted the presence of ganoine-like tissue in acanthodians and basal sarcopterygians, suggesting that ganoine might be plesio- morphic for crown osteichthyans. Schultze [8] indicated the differences in surface structure between the typical ganoine in actinopterygians (with surface elevations or microtubercles) and the enamel of cosmine in sarcopterygians (with depressed hexagons marking the borders of adjacent cells); however, this distinction is not absolute since the ganoine without microtuberlces is present in some actinopterygians, such as Cheirolepis trailli [30]. Whether the ganoine surface of Guiyu oneiros or the enamel surface of the dermal skeleton in other stem sarcopterygians [11,13,19,23,31] bears the microtubercles or not needs further investigation.…”

Section: 1 General Features Of Skull Roofmentioning

confidence: 97%

“…It was once considered a characteristic feature of basal actinopterygians [14,24,[26][27][28][29]. Richter and Smith [30] noted the presence of ganoine-like tissue in acanthodians and basal sarcopterygians, suggesting that ganoine might be plesio- morphic for crown osteichthyans. Schultze [8] indicated the differences in surface structure between the typical ganoine in actinopterygians (with surface elevations or microtubercles) and the enamel of cosmine in sarcopterygians (with depressed hexagons marking the borders of adjacent cells); however, this distinction is not absolute since the ganoine without microtuberlces is present in some actinopterygians, such as Cheirolepis trailli [30].…”

Section: 1 General Features Of Skull Roofmentioning

confidence: 99%

Cranial morphology of the Silurian sarcopterygian Guiyu oneiros (Gnathostomata: Osteichthyes)

Qiao

Zhu

2010

Sci. China Earth Sci.

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Cranial morphological features of the stem-group sarcopterygian Guiyu oneiros Zhu et al., 2009 provided here include the dermal bone pattern and anatomical details of the ethmosphenoid. Based on those features, we restored, for the first time, the skull roof bone pattern in the Guiyu clade that comprises Psarolepis and Achoania. Comparisons with Onychodus, Achoania, coelacanths, and actinopterygians show that the posterior nostril enclosed by the preorbital or the preorbital process is shared by actinopterygians and sarcopterygians, and the lachrymals in sarcopterygians and actinopterygians are not homologous. The endocranium closely resembles that of Psarolepis, Achoania and Onychodus; however, the attachment area of the vomer possesses irregular ridges and grooves as in Youngolepis and Diabolepis. The orbito-nasal canal is positioned mesial to the nasal capsule as in Youngolepis and porolepiforms. The position of the hypophysial canal at the same level or slightly anterior to the ethmoid articulation represents a synapmorphy of the Guiyu clade. The large attachment area of the basicranial muscle indicates the presence of a well-developed intracranial joint in Guiyu. Sarcopterygii, Osteichthyes, Cranial morphology, homology, Silurian, China Citation:Qiao T, Zhu M. Cranial morphology of the Silurian sarcopterygian Guiyu oneiros (Gnathostomata: Osteichthyes).

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A microstructural study of the ganoine tissue of selected lower vertebrates

Cited by 42 publications

References 0 publications

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Preservation of successive diagenetic stages in Middle Triassic bonebeds: Evidence from in situ trace element and strontium isotope analysis of vertebrate fossils

Cranial morphology of the Silurian sarcopterygian Guiyu oneiros (Gnathostomata: Osteichthyes)

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