Revision of trilobites Calodiscus Howell, 1935 (Siberian platform)

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Abstract

A revision of trilobites of the genus Calodiscus Howell, 1935 from the Lower Cambrian of the Siberian platform was carried out. It is shown that of the four representatives of the genus described from the lower Botomian stage of the Lower Cambrian of the General Stratigraphic Scale of Russia, two species C. helena (Walcott, 1889) and C. granulosus Jegorova et Shabanov, 1972 have significant differences from typical representatives of the genus. The affiliation of these species to the new genus Paracalodiscus, belonging to the family Weymouthiidae Kobayashi, 1943, is substantiated. Two other species (Calodiscus resimus Repina, 1972, and C. schucherti (Matthew, 1896)), although they have some differences from the type representatives, were left in the Calodiscus Howell, 1935.

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About the authors

I. V. Korovnikov

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Science; Novosibirsk State University

Author for correspondence.
Email: KorovnikovIV@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

E. V. Bushuev

All-Russian Scientific Research Geological Petroleum Institute

Email: KorovnikovIV@ipgg.sbras.ru

Novosibirsk branch

Russian Federation, Novosibirsk

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Supplementary files

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2. Fig. 1. Locations of trilobites of the genera Calodiscus and Paracalodiscus on the Siberian Platform: 1 – Sukharikha River, 2 – Kulyumbe River, 3 – Chopko River, 4 – Olenek River (middle reaches), 5 – Malaya Kuonamka River, 6 – Nekekit River, 7 – Boroulakh River, 8 – Yudoma River. The dotted line indicates the boundary of the Siberian Platform.

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3. Fig. 2. Scheme of correlation of sections with finds of trilobites of the genera Calodiscus and Paracalodiscus gen. nov. Designations: 1 – light gray, variegated, clayey limestones; 2 – dark gray, black, clayey limestones; 3 – dark gray, black, massive, thick-slabby limestones; 4 – black shales; 5 – finds of trilobites and intervals of their distribution; 6 – upper boundary of layers with Calodiscus of the Botomian stage of the OSS.

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4. Fig. 3. Trilobites of the genera Calodiscus and Paracalodiscus gen. nov.: a, b, e, h – Calodiscus schucherti (Matthew, 1896): a – specimen 60/14a, cephalon, dorsal view; b – specimen 60/14a, pygidium, dorsal view; e – specimen 60/17, cephalon, dorsal view; h – specimen 60/14a, pygidium, lateral view; Siberian Platform, Sukharikha River; Shumninskaya Formation; c–d, g, i – C. resimus Repina, 1972: c – specimen 125/22d (1), cranidium, dorsal view; g – specimen 125/22g, pygidium, dorsal view; d – specimen 125/22д (2), cranidium, dorsal view; f – specimen 125/22д (2), cranidium, anterior view; i – specimen 125/22д (2), cranidium, lateral view; Siberian Platform, Sukharikha River; Shumninskaya Formation; k, l – Paracalodiscus granulosus (Egorova et Shabanov, 1972): k – specimen 13/II–3ж, cephalon, dorsal view (Savitsky et al., 1972, pl. 1, fig. 1); l – specimen 13/II–3ж, pygidium, dorsal view (Savitsky et al., 1972, pl. 1, fig. 3); Siberian Platform, Nekekit River, Kuonamskaya Formation; Lower Cambrian, Botomian Stage.

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5. Table VII

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6. Table VIII

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