Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here


No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Journal of Crustacean Biology

ABSTRACT The shrimp Procaris ascensionis occurs in landlocked pools that are under tidal influence. Individuals occur in shaded areas in deep crevices and almost never occur in sunlit or open areas. Although this species has been considered to be rare, our field observations during March 1983 revealed densities of 18.2 ± 4.9 individuals m–3 in lava caves leading off surface pools. Size segregation is evident in pools and caves, with smaller individuals spending most of their time in crevices and among the coenocytic alga Valonia and branching green algae. Large individuals primarily spend a large portion of their time in the water column swimming upside down using pereiopodal exopods and pleopods. While on the cave bottom large individuals move through algae, extending the achelate pereiopods laterally, apparently searching for prey. When a prey item is encountered, Procaris extends all five pereiopods and pulls the prey ventrally, trapping it against the gnathothorax with the aid of the third maxillipeds. Procaris then swims upside down holding the prey within a cage formed by the spinous pereiopods. Detection of prey is probably accomplished by mechano- or chemoreceptors borne on the pereiopods and third maxillipeds. Sections through the reduced eye revealed no ommatidia, suggesting that this shrimp is blind. Procaris is a voracious predator on the gammarid amphipod Melita and the atyid shrimp Typhlatya rogersi, although detailed gut analyses produced equal amounts of animal parts and plants (filamentous algae and benthic diatoms). The reproductive biology of Procaris remains unknown.

Affiliations: 1: Department of Biological Science, Florida State University, Tallahassee, Florida 32306.


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
    Journal of Crustacean Biology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation