Mitrellataxis, a New Multielement Genus of Late Devonian Conodont

Chauff, Karl M.; Price, Rex C.

doi:10.2307/1485437

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…However, this interpretation remains equivocal (Wang & Turner 1985;Wang 1993). Adding further confusion, Wang (in Wang & Klapper 1987) disputed the conodont a¤nity of Mitrellataxis (Chau¡ & Price 1980) on histological grounds, concluding a vertebrate a¤nity. Histology was also used by Klapper & Bergstro« m (1984) to assess the a¤nity of Archeognathus Cullison.…”

Section: A Historical Review Of Studies Of Conodont Hard Tissue Histomentioning

confidence: 99%

“…Clark et al (1981) even went so far as to include the histological complexity of conodont elements as a character in his diagnosis of the Conodonta. Chau¡ & Price (1980) used histological characters to justify the conodont a¤nity of their new Devonian genus Mitrellataxis, which they brie£y compared microstructurally with ¢sh scales from the same deposits. Wang (in Wang & Klapper 1987;Wang 1989) similarly used internal structure as a means of justifying the a¤nity of Fungulodus Gagiev.…”

Section: A Historical Review Of Studies Of Conodont Hard Tissue Histologymentioning

confidence: 99%

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Growth and patterning in the conodont skeleton

Donoghue

1998

Phil. Trans. R. Soc. Lond. B

108

151

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Recent advances in our understanding of conodont palaeobiology and functional morphology have rendered established hypotheses of element growth untenable. In order to address this problem, hard tissue histology is reviewed paying particular attention to the relationships during growth of the component hard tissues comprising conodont elements, and ignoring a priori assumptions of the homologies of these tissues. Conodont element growth is considered further in terms of the pattern of formation, of which four distinct types are described, all possibly derived from a primitive condition after heterochronic changes in the timing of various developmental stages. It is hoped that this may provide further means of unravelling conodont phylogeny. The manner in which the tissues grew is considered homologous with other vertebrate hard tissues, and the elements appear to have grown in a way similar to the growing scales and growing dentition of other vertebrates.

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Section: A Historical Review Of Studies Of Conodont Hard Tissue Histomentioning

confidence: 99%

Section: A Historical Review Of Studies Of Conodont Hard Tissue Histologymentioning

confidence: 99%

Growth and patterning in the conodont skeleton

Donoghue

1998

Phil. Trans. R. Soc. Lond. B

108

151

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“…The material on which this study has been based includes the collections of Mitrellataxis from Chauff & Price ( 1980); Coizchodontirs from sample 1-35-5 of Over (1992), Upper Devonian \. 'foodford Shale of Oklahoma (USA); and Fiingulodirs from Xiakou section, Yishan County, Guangxi Province of China.…”

Section: Methodsmentioning

confidence: 99%

“…Discussion structures interpreted as tubules by Wang are in fact channels produced by the effect of the etching agent on tissues of differing susceptibility to dissolution. Chauff & Price (1980) used HC1 as an etching agent, whereas we have used H,PO, in our study, which in low concentration (0.5%) etches much more slowly than HC1 and reveals finer detail. The orientation of the crystallites around the channels is also incompatible with an interpretation as dentine.…”

Section: Conchodontysmentioning

confidence: 99%

“…However, the fine-grained tissue overlying is unlike any in a lower vertebrate. Wang (in Wang & Klapper 1986) compared the columnar tissue in Mitrellataxis coronelln to dentine because, in his opinion, the sections figured by Chauff & Price (1980) bore tubules. \Yith the new data presented here, it is apparent that the of white matter is therefore a potential apomorphy of conodonts, although the lack of white matter in the earliest euconodonts indicates that it is not a synapomorphy (shared derived character) of the Conodonta (as currently perceived).…”

Section: Histologymentioning

confidence: 99%

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Conchodontus, Mitrellataxis and Fungulodus : Conodonts, fish or both?

Donoghue

Chauffe

1998

LET

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1998 12 15: Conchodontus, Mitrellataxis and frngulodirs: Conodonts, fish or both? Lethaia, Vol. 31, pp. 283-292. Oslo. ISSN 0024-1 164.Conchodontus, Mitrellataxis and Fungulodus are phosphatic microfossils from the Late Devonian of China and North America, alternatively interpreted as conodont elements or fish scales. The histology and microornament of these sclerites have been studied in an attempt to resolve their affinity, and to determine characters for distinguishing between conodont elements and the ichthyoliths of other lower vertebrates. The histology of all three genera is directly comparable to conodont elements, dispelling the notion that conodonts are histologically indistinguishable from the teeth and scales of other vertebrates. Microornament is found not to be useful in discriminating between high-level taxonomic groupings. White matter and thickness of prismless enamel are suggested as apomorphies of the Conodonta. OConodonts, ichthyoliths, histology, microornament, apomorphy, Agnatha. Philip C.I. Donoghue [pcjdZ@le.ac.uk], School of Earth Sciences, University of Birmingham, Edgbaston, Birmingham 815 ZTT, UK [current address: Department of Geology, University of Leicester, Leicester LEI 7RH, UK]; Karl M. Chauffe [chauff@eas.sln.edu],

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Conodonts, stratigraphy, and relative sea-level changes of the Tribes Hill Formation (Lower Ordovician, east-central New York)

1996

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Tremadocian onlap is recorded by the Tribes Hill Formation. The formation is a lower Lower Ordovician (upper conodont Fauna B Interval(?)-Rossodus manitouensis Zone) depositional sequence that unconformably overlies the Upper Cambrian Little Falls Formation.Depositional environments and stratigraphy indicate that the Tribes Hill was deposited on a wave-, not tide-, dominated shelf and that a uniform, “layer-cake” stratigraphy is present. The deepening-shoaling sequence of the Tribes Hill includes the: 1) Sprakers Member (new; peritidal carbonate and overlying tempestite limestone and shale); 2) Van Wie Member (new; subtidal shale and limestone); 3) Wolf Hollow Member (revised; massive carbonates with thrombolitic cap); and 4) Canyon Road Member (new; glauconitic limestone and overlying evaporitic dolostone). The shoaling half-cycle of the Tribes Hill is older than a shoaling event in western Newfoundland, and suggests epeirogenic factors in earliest Ordovician sea-level change in east Laurentia. Conodont and trilobite biofacies track lithofacies, and Rossodus manitouensis Zone conodonts and Bellefontia Biofacies trilobites appear in the distal, middle Tribes Hill Formation.Twenty-four conodont species are illustrated. Ansella? protoserrata new species, Iapetognathus sprakersi new species, Leukorhinion ambonodes new genus and species, and Laurentoscandodus new genus are described.

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Mitrellataxis, a New Multielement Genus of Late Devonian Conodont

Cited by 6 publications

References 5 publications

Growth and patterning in the conodont skeleton

Growth and patterning in the conodont skeleton

Conchodontus, Mitrellataxis and Fungulodus : Conodonts, fish or both?

Conodonts, stratigraphy, and relative sea-level changes of the Tribes Hill Formation (Lower Ordovician, east-central New York)

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