Surface Patterns on Selected Mississippian Conodonts

Pierce, Robert W.; Langenheim, Ralph L.

doi:10.1130/0016-7606(1970)81[3225:sposmc]2.0.co;2

Cited by 17 publications

(10 citation statements)

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“…34.5, 35.1); lower ('aboral') surfaces simply display ridges formed by lamellar terminations. Such a distribution has been reported for Polygnathus and Palmatolepis (Pierce & Lagenheim 1970) and for Siphonodella (Fig. IF-G), although it should be noted that some 'pitted' genera, for example Amorphognathus, are ornamented all over.…”

Section: Polygonal Pitting and Growth Of Siphonodellasupporting

confidence: 71%

“…In summary, polygonal pit networks on brachiopod shells and vertebrate enamel both result from a morphological replication of the secreting epithelium. Hass (1941) and Pierce & Lagenheim (1970) suggested a similar relationship in the conodonts with mineralogic reproduction of organic tissue surfaces. Each pit does not necessarily represent an individual secreting cell, but rather a cell process or group of cells.…”

Section: Polygonal Pitting and Growth Of Siphonodellamentioning

confidence: 92%

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Polygonal ornament in the conodont Siphonodella: an internal record

Burnett

1988

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Polygonal ‘pit’ ornamentation has been reported from a wide range of conodont genera, typically distributed semi‐continuously over the upper surface. Observations using the Scanning Electron Microscope (SEM) on the interior of Siphonodella have revealed polygonal pitting over the external surface of inner lamellae. The importance of this observation for the development of Siphonodella is discussed. ▭ Siphonodella, polygonal ornament, microstructure, growth.

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Section: Polygonal Pitting and Growth Of Siphonodellasupporting

confidence: 71%

Section: Polygonal Pitting and Growth Of Siphonodellamentioning

confidence: 92%

Polygonal ornament in the conodont Siphonodella: an internal record

Burnett

1988

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“…Novel studies generated by these findings include those utilizing polygonal surface microsculpture on conodont elements to measure the genome size (Conway Morris & Harper 1988) and others that used the distribution of the microsculpture to differentiate between functionally active and passive surfaces (Burnett 1988). These, and earlier (Haas 1941;Pierce & Langenheim 1970), studies regarded this microsculpture to be imprints of epithelial secreting cells, an unproven hypothesis. We demonstrate that the polygonal structures share important characteristics with (some) animal cells, that the hypothesis that they are the imprints of secreting epithelial cells is probably correct, and that these structures are important for interpreting conodont growth, function, histology and evolution.…”

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confidence: 87%

Fossil epithelial cell imprints as indicators of conodont biology

Bitter

Norby

1994

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von Bitter, P.H. & Norby, R.D. 1994 10 15: Fossil epithelial cell imprints as indicators of conodont biology. Size and growth characteristics of microsculpture polygons on the cup nodes of the bladelike Pa elements of the conodont Lochriea commutata support the hypothesis that they are epithelial cell imprints. They are ˜2–6 pn wide and ˜4–10 pn long and are the same size throughout growth of the element. The epithelial imprints increased in number with growth, either linearly or periodically; the latter possibility may be important for defining specific growth stages of conodont elements. The imprint location on the top of nodes suggests that the latter were tissue‐covered and that the scissor‐model of function applies to these bladelike Pa elements. The location of the imprints also reflects evolutionary history: a probable ancestor, L. cracoviensis (Belka), also lacks a platform and possesses well‐developed microsculpture polygons on broad cup nodes. Finally, correlation between internal white matter and external microsculpture suggests that internal osteocytes may have supplied the external secreting cells with calcium phosphate from the inner storage bank. Conodont biology, fossil epithelial imprints, polygonal microsculpture, Carbonferous, Lochriea commutata.

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“…287-288. Oslo, 1994 03 21 Polygonal ornament in conodonts ANDREJ V. ZHURAVLEV Polygonal micro-ornamentation in platform conodont elements has been described in detail by Pierce & Langenheim (1970), Burnett (1988) and Conway Morris & Harper (1988). The latter authors interpreted the ornament as epithelial cell imprints and regarded the polygon size as proportional to the quantity of DNA in the cell nucleus.…”

Section: Lethaia Seminarmentioning

confidence: 99%

Presence of the Earliest Vertebrate Hard Tissue in Conodonts

Sansom

Smith²,

Armstrong³

et al. 1992

Science

158

121

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From histological investigations into the microstructure of conodont elements, a number of tissue types characteristic of the phosphatic skeleton of vertebrates have been identified. These include cellular bone, two forms of hypermineralized enamel homologs, and globular calcified cartilage. The presence of cellular bone in conodont elements provides unequivocal evidence for their vertebrate affinities. Furthermore, the identification of vertebrate hard tissues in the oral elements of conodonts extends the earliest occurrence of vertebrate hard tissues back by around 40 million years, from the Middle Ordovician (475 million years ago) to the Late Cambrian (515 million years ago).

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Surface Patterns on Selected Mississippian Conodonts

Cited by 17 publications

References 0 publications

Polygonal ornament in the conodont Siphonodella: an internal record

Polygonal ornament in the conodont Siphonodella: an internal record

Fossil epithelial cell imprints as indicators of conodont biology

Presence of the Earliest Vertebrate Hard Tissue in Conodonts

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