Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Schultze, Hans‐Peter

doi:10.1016/j.crpv.2015.04.001

Cited by 68 publications

(80 citation statements)

References 55 publications

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“…Elasmoid scales of cycloid type are the most common. These are restricted to most Teleostei from Leptolepis corhyphaenoides and all more derived ones (Schultze, 1966(Schultze, , 2015Meunier and Brito, 2004;Arratia and Schultze, 2007;Arratia, 2015). Ganoid scales of lepisosteoide type are present among most basal forms, for example, in members of the family Aspidorhynchidae (Schultze, 1966;Brito, 1997;Brito and Meunier, 2000), in the teleost family Pholidophoridae (Nybelin, 1966;Arratia, 2013Arratia, , 2015, in Catervariolus hornemani (Taverne, 2011), in species of Siemensichthys (Arratia, 2000), and in Dorsetichthys bechei (Nybelin, 1966;Arratia, 2013).…”

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

“…The presence of ganoid scales with peg-and-socket articulation is also a common feature of holostean neopterygians, such as semionotiforms, lepisosteiforms, and macrosemiiforms (Schultze, 1966(Schultze, , 1996(Schultze, , 2015. Ganoid scales of Teleosteomorpha n. sp.…”

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

“…Ganoid scales of lepisosteoide type are present among most basal forms, for example, in members of the family Aspidorhynchidae (Schultze, 1966;Brito, 1997;Brito and Meunier, 2000), in the teleost family Pholidophoridae (Nybelin, 1966;Arratia, 2013Arratia, , 2015, in Catervariolus hornemani (Taverne, 2011), in species of Siemensichthys (Arratia, 2000), and in Dorsetichthys bechei (Nybelin, 1966;Arratia, 2013). Amioid-type scales are also present among teleosts, but only in species of Eurycormus (Schultze, 1966(Schultze, , 2015Arratia and Schultze, 2007;Schultze and Arratia, 2015).…”

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

“…1 from the La Cantera Formation are of the lepisosteoid type with multiple ganoine layers, canaliculi of Williamson (Schultze, 1966(Schultze, , 2015Sire et al, 2009) in the basal bony layer, and no dentine. The surface of the flank scales is smooth, and microscopically it is bare of tubercles or denticles.…”

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

“…Scales of fishes can provide valid taxonomic and phylogenetic information for different taxa (e.g., Schultze, 1966Schultze, , 1996Schultze, , 2015Sire and Meunier, 1994;Richter and Smith,tia and Schultze, 2012). Detailed descriptions (micro-and macromorphology) of these structures could be a tool for helping to clarify taxonomic assignments and possible relationships of fishes from the La Cantera Formation.…”

Section: Introductionmentioning

confidence: 99%

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Scale morphology and specialized dorsal scales of a new teleosteomorph fish from the Aptian of West Gondwana

2016

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Abstract. Scales of a new species of Teleosteomorpha from the continental Aptian of the south of South America are studied. These neopterygians are from the La Cantera Formation in central Argentina, and were previously identified as Pholidophoriformes. They present ganoid scales; most of them are rhombic with well-developed peg-and-socket articulations and possessing a smooth surface. They have a straight posterior margin, but occasionally, some scales of the flank have a sinuous posterior margin with one or two serrations. The shape of the scales varies along the body from large, rectangular and deeper than long scales behind the head to the preanal region to smaller and rhomboidal scales in the caudal region. There are a few horizontal rows along the flank and about 32 lateral line scales. Thick, round ganoid scales are present in the prepelvic region close to the ventral margin. The round and rhombic scales present growth lines, which form concentric ridges on the external side. A characteristic row of deep scales forms the dorsal margin on each side of the body; a row of median ridge scales is not present. This is a unique feature of the studied fishes. Scutes covered with unornamented ganoine precede the pelvic, dorsal, and anal fins, as well as the dorsal and ventral margins of the caudal fin. The posterior margin of the dorsal lobe of the caudal fin is formed by a single line of scales, which continues and covers the base of the first principal caudal ray. Histological studies reveal a lepisosteoid-scale type with multiple ganoine layers, lack of dentine, and the presence of canaliculi of Williamson. The macro-and micromorphology of the scales shows features that are found in other teleosteomorphs, but also in other neopterygians.

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Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

Section: Comparison With Scales Of Other Teleosteomorpha and Other Nementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scale morphology and specialized dorsal scales of a new teleosteomorph fish from the Aptian of West Gondwana

2016

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Comparative ultrastructure and ornamentation characteristics of scales in gobiid species (Teleostei: Gobiidae) using the scanning electron microscope

Sadeghi

Esmaeili

Teimori

et al. 2020

Microscopy Res & Technique

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To study scale based phylogenetic affinity, the ultrastructure and ornamentation characteristics of body key scales were studied for 12 gobiid species from the Iranian coast of the Persian Gulf including Qeshm and Hormuz Islands and the Makran coast of the Oman Sea using scanning electron microscopy (SEM) technique. The scales were removed from below the first dorsal fin, cleaned in potassium hydroxide solution 1%, and were prepared for the SEM imaging. The presence of both ctenoid and cycloid scales in the studied gobiids was revealed. The focus of ctenoid scales was positioned posteriorly, while the focus of cycloid scales was positioned in the postero-central part of the scale. In all the studied species, radii were located only on the anterior part of the scale, and the primary radii were dominant. Also, there were no granules in the inter circular space, but bifurcation was observed in some circuli.In most species, the teeth-like structures called lepidonts were present on the crest of circuli, which functionally help to firmly attach the scales to the epithelium. The dendrogram of the between-groups-linkage method sorted the gobiid species into the two main groups of five distinct clusters: (a) Cryptocentroides arabicus and Cryptocentrus cyanotaenia (the Cryptocentrus-lineage); (b) Bathygobius meggitti and Bathygobius cocosensis (the Glossogobius-lineage); (c) Coryogalops adamsoni and Coryogalops tessellatus (the Gobius-lineage); (d) Acentrogobius dayi, Istigobius ornatus,Favonigobius reichei, Aulopareia ocellata, and Silhouettea ghazalae (the Gobiopsis-lineage). It seems that the dendrogram topology obtained based on the macro-and microscopic structures of scales, reveals phylogenetic lineages of gobies that have already been proposed for these taxa. Hence, the results of this study are largely consistent with the previous molecular studies on the gobiid fishes and implied that besides other data, the analysis of scale shape and scale-surface microstructures could be served to study the diversification of gobiid species.

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Morphological and microstructural characteristics of scales in longnose goby Awaous jayakari (Teleostei: Gobiidae): Light and scanning electron microscopy approaches

Jufaili

Masoumi

Esmaeili

et al. 2021

Microscopy Res & Technique

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The scale morphology of a native goby, Awaous jayakari (Gobiidae) was studied using scanning electron microscopy and light microscopy. The morphological descriptions were based on the scale's type, shape, and features of the anterior, posterior, and lateral fields. Further characteristics of the focus, circuli, radii, lepidonts, and cteni, were investigated. Morphometric indices were calculated for some scales. Shape variability of scales was high in different regions. However, the majority of scales displayed a polygonal shape (hexagonal and pentagonal). Both ctenoid and cycloid scales were observed in the studied fishes. The ctenoid scale of A. jayakari was peripheral and characterized by the presence of one row of marginally located spines in two completed and uncompleted subtypes. The focus was positioned posteriorly or postero-centrally. The microscopic examinations revealed the presence of lepidonts of different sizes being very tiny, small, or prominent performing flat, blunt, pointed, short, or truncated shapes. The rostral margin of the scales was convex to moderately flattened and represented striate, scalloped, or waved types. Lateral fields were often flattened in all regions, while convex in the lateral fields of the scales of some individuals. The posterior field showed variations in different regions, for example, tapered and flattened ends. The anterior-posterior axis presented a laterally expanded or an elongated extension. The considerable morphological variation in the scales of various body regions makes it difficult to nominate a typical scale to be used in taxonomic studies. However, the key scales can be used for the comparison of different Awaous species.

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Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans

Cited by 68 publications

References 55 publications

Scale morphology and specialized dorsal scales of a new teleosteomorph fish from the Aptian of West Gondwana

Scale morphology and specialized dorsal scales of a new teleosteomorph fish from the Aptian of West Gondwana

Comparative ultrastructure and ornamentation characteristics of scales in gobiid species (Teleostei: Gobiidae) using the scanning electron microscope

Morphological and microstructural characteristics of scales in longnose goby Awaous jayakari (Teleostei: Gobiidae): Light and scanning electron microscopy approaches

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