Eodiscina

Eodiscina
	Marocconus notabilis (GEYER, 1988)
Temporal occurrence
	Cambrian
Locations
	Worldwide;
Systematics
	Primordial mouths (protostomia)
	Molting animals (Ecdysozoa)
	Arthropod (arthropoda)
	Trilobites (Trilobita)
	Agnostida
	Eodiscina
Scientific name
	Eodiscina
	Kobayashi , 1939

The Eodiscina are a group of the trilobites , a class of extinct marine arthropods , and are counted among the Agnostida .

features

Eodiscines are small trilobites, which were limited to the Cambrian (2nd and 3rd series). The most distinctive features of this group of animals are the two or three pleural segments of the thorax and the less differentiated spindle rings of the pygidium .

Occurrence

A planktonic way of life is assumed, which can also explain the large geographical distribution of some species. This, as well as the short-lived nature of individual Eodiscine species, predestines them as key fossils . A popular example is the trilobite Marocconus notabilis from the Middle Cambrian of Morocco, which is the key fossil of the notabilis zone. Even so, Eodiscins are generally relatively rare. An exception is, for example, the Lower Cambrian Eodiscid schist from Görlitz (Saxony) where the species Serrodiscus (Eodiscus) silesius occurs more frequently in layers.

Serrodiscus (Eodiscus) silesius R. & E. RICHTER, 1941 from the Lower Cambrian of Görlitz

literature

J. Bergström: Organization, life, and systematics of trilobites. (= Fossils and Strata. Volume 2). Oslo 1973, ISBN 82-00-09330-1 .
H. Brause: The hidden Old Palaeozoic of Lausitz and its regional position. (= Treatises of the German Academy of Sciences Berlin, class for mining, metallurgy and mining geology . Volume 1968.1). Berlin 1969, DNB 456180508 .

A. Christian: A guide through our exhibitions. 6th edition. State Museum for Natural History Görlitz, Görlitz 1990.

Gil Cid, María Dolores: Los Trilobites Agnöstidos del Cámbrico Inferior y Medio de España. In: Boletín Geológico y Minero. Volume 92, No. II, 1981, pp. 111-126.

O. Elicki: Lower Cambrian carbonates from eastern Germany: palaeontology, stratigraphy and palaeo-geography. In: New Yearbook of Geology and Paleontology, Treatises. Volume 191, No. 1, 1994, pp. 69-93.

G. Freyer: Contribution to the knowledge of the Lower Cambrian in the area of the Görlitz Slate Mountains. In: Reports of the Geological Society in the German Democratic Republic for the entire field of geological sciences. Volume 3, No. 1, 1958, pp. 18-29.

G. Freyer: The Lower Cambrian of Görlitz, its geological exploration and fossil guidance - an overview. In: Treatises and reports from the Natural History Museum in Görlitz. Volume 51, No. 7, 1977, pp. 1-15.

G. Geyer: Agnostida from the higher Lower Cambrian and the Middle Cambrian of Morocco. Part 2: Eodiscina. In: New Yearbook of Geology and Paleontology, Treatises. Volume 177, No. 1, 1988, pp. 93-133.

AH Müller: Textbook of Paleozoology. Volume II: Invertebrates. Part 2: Mollusca 2 - Arthropoda 1st 2nd edition. Gustav Fischer, Jena 1965, DNB 457645164 .

F. Rasetti: Revision of the North American trilobites of the family Eodiscidae. In: Journal of Paleontology. Volume 26, No. 3, 1952, pp. 434-451.

Rudolf Richter among others: The fauna of the lower Cambrian of Cala in Andalusia. (= Treatises of the Senckenbergische Naturforschenden Gesellschaft. Volume 455). 1941, DNB 365049778 .

R. Richter, E. Richter: A Cambrian fauna in the Lower Silesian Slate Mountains. In: Centralblatt für Mineralogie, Geologie und Paläontologie. Beilagen-Band 1923, 1924, No. 23, pp. 730-735.

U. Scheibe: The Cambrian of Niederludwigsdorf / Oberlausitz. In: fossils. Volume 1992, No. 5, 1992, pp. 298-303.

K. Sdzuy: The Cambrian of Germany. In: Reports of the XXI International Geological Congress, XXI Session. Norden 19608. 1960, pp. 102-112.

E. Zimmermann: The Paleozoic near Görlitz and the discovery of Devonian trilobites there. In: Journal of the German Geological Society. Volume 60, 1908, pp. 168-171.

H. Özdikmen: Nomenclatural changes for twenty trilobites genera. In: Munis Entomology & Zoology. Volume 4, No. 1, 2009, pp. 155-171.

Web links

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