Odontopleurida

Odontopleurida
Temporal range: Middle Cambrian–Frasnian
Radiaspis sp.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Odontopleurida
Whittington, 1959
Families

Odontopleurida is an order of very spinose trilobites closely related to the trilobites of the order Lichida.[1] Some experts group the Odontopleurid families, Odontopleuridae and Damesellidae, within Lichida. Odontopleurids tend to have convex, bar-shaped cephalons, and lobed, knob-shaped glabella that extend to, or almost to the anterior margin. Many, if not almost all odontopleurids have long spines that are derived either from the margins of the exoskeleton, or from granular or tubercular ornamentation, or both. Many odontopleurids are so spinose so as to be described as having "spines on (their) spines." Odontopleurids have 8 to 13 thoracic segments, with Odontopleuridae odontopleurids having no more than 10, and Damesellidae odontopleurids having no more than 13. The pygidium tends to be very small, and invariably has long spines emanating from it in all known genera.

Genera of Damesellidae are restricted to Middle to Upper Cambrian marine strata, and may represent a transition between Cambrian-aged lichids, and odontopleurids of Odontopleuridae. The odontopleurids of Odontopleuridae first appear in the Upper Cambrian, and go extinct before the end of the Frasnian stage of the late Devonian.[2]

Taxonomy

Odontopleuridae

Damesellidae

References

  1. ^ S. M. Gon III (February 28, 2009). "Order Odontopleurida". Retrieved November 23, 2010.
  2. ^ Moinzadeh, Mehdi (2018-12-31), "YOUTOPIA/ABOUT:BLANK", In Zukunft!, transcript Verlag, pp. 287–302, ISBN 978-3-8394-3955-5, retrieved 2024-12-23
  3. ^ Hüseyin Özdikmen (2009). "Nomenclatural changes for twenty trilobites genera" (PDF). Munis Entomology and Zoology. 4 (1): 155–171.


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