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Mesolenellus is an extinct genus of trilobites that lived during the lower Cambrian (Botomian), found in Greenland and Spitsbergen.
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The Calodiscidae Kobayashi, 1943 [nom. transl. Öpik, 1975 ex Calodiscinae Kobayashi, 1943] are a family of trilobites belonging to the order Agnostida that lived during the Lower Cambrian. They are small or very small, and have a thorax of two or three segments. The Calodiscidae includes five genera.
Cedaria is a small, rather flat trilobite with an oval outline, a headshield and tailshield of approximately the same size, 7 articulating segments in the middle part of the body and spines at the back edges of the headshield that reach halflength of the body. Cedaria lived during the early part of the Upper Cambrian (Dresbachian), and is especially abundant in the Weeks Formation.
The Paradoxidoidea Hawle & Corda 1847, are a superfamily of trilobites, a group of extinct marine arthropods. They occurred during the late Lower Cambrian (Toyonian) and disappeared at the end of the Middle Cambrian.
References
- ↑ S. M. GON III. "Order Agnostida" . Retrieved December 3, 2010.
- ↑ MIKKO HAARAMO (March 11, 2008). "†Yukoniidae". Mikko's Phylogeny Archive. Retrieved December 3, 2010.
- ↑ PALMER, A. R. 1968, Cambrian trilobites of east-central Alaska. Prof. Pap. U. S. Geol. Surv., 559-B pp. B1-B115, pls. 1-15.
- ↑ JELL, P.A. (1975). "Australian Middle Cambrian Eodiscoids with a review of the superfamily". Palaeontographica Abteilung A. 150: 1–97. cited in H.B. WHITTINGTON; et al., eds. (1997). Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida.
- ↑ WHITTINGTON, H.B.; et al. (1997). Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Part O.Revised, Volume 1 – Trilobita. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. 398–400. ISBN 0-8137-3108-9.
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