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 mouthparts of early juvenile (Stage VI) and one-year old (Stage XII) American lobsters, Homarus americanus (Decapoda: Nephropidae), were examined by scanning electron microscopy. This study describes the general morphology of all six pairs of mouthparts, as well as the types and distribution of setae they bear. In addition, it extends our understanding of the developmental sequence by providing an overview of changes from hatchling larvae (Stage I) through the first year (Stage XII). The general trends in the development of the mouthparts include an increase in overall size, an increase in the number of setae borne upon all surfaces and edges, and an increase in the size and number of spines, teeth, and denticles projecting from segments of the third and second maxillipeds and from the incisor and molar processes of the mandible. Furthermore, the cutting edge of the mandible changes dramatically as the individual teeth increase in size and coalesce. A molar process appears on the inner surface of the mandible by Stage VI, although its function is not clear. The types of setae borne upon each mouthpart are catalogued and analyzed for changes throughout the developmental sequence, from the larval stages to Stage XII lobsters. The possibility that certain setae might be precursors for other types is considered. The functions of setal types are also discussed and include chemo- and mechanoreception, grooming, manipulation of food, filtering of particles, and creation of water currents. Finally, possible functions of the mouthparts are discussed in light of their structure.

Affiliations: 1: (KLL) Boston University Marine Program, Marine Biological Laboratory, Woods Hole, Massachusetts 02543 (Mailing address) Marine Science Center, Northeastern University, East Point, Nahant, Massachusetts 01908; 2: (JRF) Division of Natural Sciences, State University of New York at Purchase, Purchase, New York 10577, U.S.A.


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