holaspis
See also: Holaspis
English edit
Etymology edit
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
Noun edit
holaspis (plural holaspides)
- (paleontology, zoology) A stage in the development of a trilobite at which the creature has gained its adult segmentation, but continues to molt and grow.
- 2001, Jonathan M. Adrain, Gregory D. Edgecombe, Bruce S. Lieberman, editors, Fossils, Phylogeny, and Form: An Analytical Approach, page 46:
- A similar situation may also characterize S. wenlockiana, a species with six segments in holaspis, the smallest holaspids of which have similar glabellar lengths to those of the sixth degree meraspis of A. konincki.
- 2008, Xuejian Zhu, Shanchi Peng, Jingxun Zuo, “Revision an Ventral Structure of Guangxiaspis guangxiensis Zhou, 1977 (Trilobita)”, in Isabel Rábano, Rodolfo Gozalo, Diego García-Bellido Capdevila, editors, Advances in Trilobite Research, page 444:
- The pygidial spines are stout and direct outward in the early holaspis (Fig. 2, A-B, F), but become slender and direct inward in the late holaspis (Fig. 2, D, E).
- 2009, Michael J. Benton, David A. T. Harper, Introduction to Paleobiology and the Fossil Record, page 366:
- The holaspis stage has a full complement of thoracic segments for the species but growth continues through further molts and maturity may not be reached until some time after the holaspis stage was reached.
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References edit
- 2007, S. M. Gon III, "Trilobite Reproduction and Development"