McLaughlin, Patsy A. Shannon Point Marine Center, Western Washington University, Anacortes, Washington.
- Related Primary Literature
- Additional Reading
A subclass of the Crustacea. The Tantulocarida was initially proposed as a class of the Crustacea to accommodate two species formerly assigned to the Copepoda or Cirripedia, but now, with four additional genera that have been described, it is ranked as a subclass. Tantulocarids are minute ectoparasites, less than 0.01 in. (0.3 mm) in length, that infest deep-sea copepods, isopods, tanaids, and ostracods (see illustration). As a result of their parasitic mode of life, adult females have lost all resemblance to crustaceans; males are free-living but nonfeeding. Infection of the host occurs at the tantulus larval stage, which is believed to occur immediately after the larva is released. The head, or cephalon, of the tantulus larva is covered by a dorsal shield that may protrude anteriorly to form a rostrum. No cephalic appendages are present, although some of the specialized structures found in tantulocarids may possibly be derived from them. The mechanism of attachment, the mouth tube, is located on the ventral surface with a distal mouth opening, and is surrounded by an oral disk. The walls of the mouth tube consist, at least in part, of a pair of chitinous bars, each with a basal swelling. A second tubular structure, the longitudinal organ, projects into the mouth tube, reaching almost to the oral opening. A structure distinguished by its striated appearance, and referred to as the striated organ, lies above, in proximity to the dorsal surface of the head. A prominent, elongate cephalic stylet is located behind the oral region.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information