different between holaspis vs protaspis

English

Etymology

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

Noun

holaspis (plural holaspides)

1. (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), 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.

Related terms

• holaspid

See also

• meraspis
• protaspis

References

• 2007, S. M. Gon III, "Trilobite Reproduction and Development"

Anagrams

• haplosis

English

Etymology

prot- +? aspis (from Ancient Greek ????? (aspís, “shield”)).

Pronunciation

• (Received Pronunciation) IPA^(key): /p???tasp?s/
• (General American) IPA^(key): /p???tæsp?s/
• Hyphenation: prot?as?pis

Noun

protaspis (plural protaspides)

1. (paleontology) A stage in the development of a trilobite where the creature has not yet developed articulated segments.

Derived terms

See also

• holaspis
• meraspis

References

• S. M. Gon III (8 November 2007) , “Trilobite Reproduction and Development”, in Trilobites.info?^[1], archived from the original on 26 April 2016.