Buccopharyngo-branchial denticles of<i>Phlebolepis elegans</i>Pander (Thelodonti, Agnatha)

Märss, Tiiu; Wilson, Mark V. H.

doi:10.1671/0272-4634(2008)28[601:bdopep]2.0.co;2

Cited by 6 publications

(9 citation statements)

References 17 publications

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“…In Oniscolepis, as seen in the smaller fragment, the posterior unit is deltoid in cross section, as is the posterior part of the branchial plate of Tolypelepis. Similarity with the thelodont P. elegans is expressed in both species having a finely sculptured visceral surface (Märss & Wilson 2008) and possibly a branchial cover consisting of short units, but lacking any long plate. The lateral line system in O. dentata was built of short vertical canals in which single neuromasts were located.…”

Section: Comparisonmentioning

confidence: 78%

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Late Silurian–Early Devonian tessellated heterostracanOniscolepisPander, 1856 from the East Baltic and North Timan

Märss¹,

Karatajute-Talimaa²

2009

Estonian J. Earth Sci.

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Pander (1856, Monographie der fossilen Fische der silurischen Systems der Russisch-Baltischen Gouvernements. Obersilurische Fische. Buchdruckerei Kaiserlichen Akademie des Wissenschaften, St. Petersburg, 91 pp.) first established four Oniscolepis and three Strosipherus species, which later, except O. magna, were referred to Oniscolepis dentata, the name fixed by Rohon (1893, Mémoires de l´Académie Impériale des Sciences de St.-Petersbourg, 41, 1-124) as the senior synonym.Using modern techniques, we redescribe and illustrate morphological and histological varieties of its platelets, tesserae, and scales. No articulated specimen of O. dentata has ever been found. Fragments of head platelets, two branchial plates, an orbital plate (or tessera), and body ridge elements are described for the first time. The microstructure of scales of O. dentata specimens from the East Baltic and North Timan differs only slightly from that of scales from the type locality, Saaremaa Island, Ohesaare Cliff, which has fewer and finer dentine tubules and Sharpey's fibre tubules than the specimens from North Timan. Oniscolepis Pander and Kallostrakon Lankester are united into a new family Oniscolepididae fam. nov. with the type genus Oniscolepis Pander.

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Section: Comparisonmentioning

confidence: 78%

“…obs. ), and the thelodont Phlebolepis elegans Pander (Märss & Wilson 2008). The maximum width of the larger fragment of the branchial plate of Oniscolepis is 3.55 mm, in Tolypelepis about 4 mm.…”

Section: Comparisonmentioning

confidence: 97%

Late Silurian–Early Devonian tessellated heterostracanOniscolepisPander, 1856 from the East Baltic and North Timan

Märss¹,

Karatajute-Talimaa²

2009

Estonian J. Earth Sci.

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“…Märss & Wilson (2008) described internal structures of Phlebolepis for the first time. The denticles and denticulate platelets discovered, along with rostral, cephalo-pectoral and lateral scales, give evidence that they come from the anterior part of the body, from the lining of the bucco-pharyngeal and branchial regions (i.e., the mouth and throat, and the branchial ducts and chambers).…”

Section: Phlebolepis Elegansmentioning

confidence: 99%

“…Scale morphology varies on the body; different scale types have been defined and described several times (Märss 1986a(Märss , 1986bMärss et al 2007;Märss & Wilson 2008) and will not be repeated here. Sculpture (elements of ornament larger than 50 µm) on the crown of typical body scales consists of posteriorly converging ridges that meet in a central raised crest (Märss et al 2007, fig.…”

Section: Squamationmentioning

confidence: 99%

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Anatomy of the Silurian thelodontPhlebolepis elegansPander

Wilson¹,

Märss²

2012

Estonian J. Earth Sci.

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The Silurian thelodont Phlebolepis elegans Pander from Saaremaa, Estonia, is one of the most-often illustrated early vertebrates, yet its external morphology has remained poorly known and experts seldom agree about its probable body form. We examined hundreds of articulated specimens from the type locality (Himmiste Quarry) to reconstruct its morphological features. We found that a reconstruction published more than four decades ago by A. Ritchie was the best available till now. We disagreed mostly in that the mouth is not terminal, but subterminal, and there is a slight development of a rostrum dorsal to the mouth. The pectoral fin originates close behind the orbits, but is otherwise similar to Ritchie's reconstruction. We also found the caudal fin to be much larger, more flexible and more symmetrical (though not perfectly symmetrical) than earlier reconstructions, with a large dorsal lobe and an even larger ventral lobe, and a fin web supported by slender 'ray-like' scale-covered lobes. The shape, number and location of the branchial openings are notably still not certainly known. Our preferred morphological features are represented by an artist's restoration. With this revised understanding, future representations of Phlebolepis elegans can be based on more reliable information and its morphology can be compared more accurately with that of other early vertebrates.

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Facts and fancies about early fossil chordates and vertebrates

Janvier

2015

Nature

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The interrelationships between major living vertebrate, and even chordate, groups are now reasonably well resolved thanks to a large amount of generally congruent data derived from molecular sequences, anatomy and physiology. But fossils provide unexpected combinations of characters that help us to understand how the anatomy of modern groups was progressively shaped over millions of years. The dawn of vertebrates is documented by fossils that are preserved as either soft-tissue imprints, or minute skeletal fragments, and it is sometimes difficult for palaeontologists to tell which of them are reliable vertebrate remains and which merely reflect our idea of an ancestral vertebrate.

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Buccopharyngo-branchial denticles ofPhlebolepis elegansPander (Thelodonti, Agnatha)

Cited by 6 publications

References 17 publications

Late Silurian–Early Devonian tessellated heterostracanOniscolepisPander, 1856 from the East Baltic and North Timan

Late Silurian–Early Devonian tessellated heterostracanOniscolepisPander, 1856 from the East Baltic and North Timan

Anatomy of the Silurian thelodontPhlebolepis elegansPander

Facts and fancies about early fossil chordates and vertebrates

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