A NEW CHONDRICHTHYAN FROM THE WENLOCK, LOWER SILURIAN, OF BAILLIE-HAMILTON ISLAND, THE CANADIAN ARCTIC
@inproceedings{Mrss2001ANC, title={A NEW CHONDRICHTHYAN FROM THE WENLOCK, LOWER SILURIAN, OF BAILLIE-HAMILTON ISLAND, THE CANADIAN ARCTIC}, author={Tiiu M{\"a}rss and Pierre-Yves Gagnier}, year={2001} }
Abstract Kannathalepis milleri, gen. et sp. nov. is described from the Upper Sheinwoodian to Lower Homerian interval (Wenlock) of the Baillie-Hamilton Island section, Canadian Arctic. Based on several distinct features, such as the occurrence of several canals in the neck region, much smaller length of the wide and short base compared to the crown, presence of compound scales, character of dentine canals and tubules, and specific ultrasculpture of the crown, the new taxon Kannathalepis milleri…
18 Citations
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- Geography, Environmental Science
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- Environmental Science
- 2006
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References
SHOWING 1-10 OF 23 REFERENCES
A microvertebrate fauna from the Llandovery of South China
- Environmental ScienceTransactions of the Royal Society of Edinburgh: Earth Sciences
- 1999
Abstract The late Llandovery (early Silurian) of South China has yielded a locally abundant and diverse microvertebrate fauna. This includes scales of the little-known mongolepids, sinacanthid spines…
Agnathan vertebrates in the Lower Silurian of Gotland, Sweden
- Environmental Science
- 1990
Abstract The vertebrate scale collections from the Telychian? (upper Llandovery) Lower Visby Beds to the Gorstian? (lower Ludlow) upper Klinteberg Beds mostly represent low diversity thelodont…
The microstructure of the dentition and dermal ornament of three dipnoans from the devonian of Western Australia: a contribution towards dipnoan interrelations, and morphogenesis, growth and adaptation of the skeletal tissues.
- BiologyPhilosophical transactions of the Royal Society of London. Series B, Biological sciences
- 1977
The phyletic trend towards macromerism, as shown in chondricthyans and primitive teleostomes, is illustrated in the three species of dipnoan, and the loss of cosmine and replacement by tubercles in Griphognathus whitei and Holodipterus gogoensis is explained as retention of an ontogenetic potential which is comparable with Orvig's theory ofcosmine regression in the porolepids.
Ausgangsform und Entwicklung der rhombischen Schuppen der Osteichthyes (Pisces)
- Art
- 1977
Ganoid and cosmoid scales, the two types of rhombic scales within the osteichthyans, can be traced back to a primitive scale similar to the scales ofLophosteus. The primitive rhombic scale did not…
Determination Methods for the Exoskeletal Remains of Early Vertebrates
- Biology
- 1998
For determination of discrete exoskeletal elements, their morphology, internal structure, defined tissue types of crown and basal plate, types of their growth, system of vascular canals should be studied in addition changes occuring during ontogenetic development of both the dermal skeletal elements and the squamation should be taken in consideration.
Types of morphogenesis of the dermal skeleton in fossil sharks
- Biology
- 1978
The adaptive significance, both of different type of morphogenesis of the dermal skeleton as well as different types of scale shapes, is discussed.
Evolution of Dermal Skeleton and Dentition in Vertebrates
- Biology
- 1982
The starting point of comparative evolutionary studies of the dermal skeleton of vertebrates is Hertwig’s series of papers (1874, 1876/1879/1882), which directly stimulated many dozens of papers,…
The fossil record 2
- Biology
- 1993
This chapter discusses the main groups of the phylum Protozoa, which consists of Invertebrates, Amphibian-grade Tetrapoda, and Plants, and their relationships to each other.
DISTRIBUTION OF SILURIAN AND LOWER DEVONIAN VERTEBRATE MICROREMAINS AND CONODONTS IN THE BAILLIE-HAMILTON AND CORNWALLIS ISLAND SECTIONS, CANADIAN ARCTIC
- GeologyProceedings of the Estonian Academy of Sciences. Geology
- 1998
Evolution of the dermal skeleton in vertebrates: The Odontode Regulation Theory
- Environmental Science
- 1982