Morandini, André C. Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.
- Links to Primary Literature
- Additional Readings
One of the three orders of the cnidarian class Scyphozoa; often referred to as crown jellyfishes. The Coronatae are mainly known as free-swimming marine jellyfishes (medusae) with conspicuous bell shapes and colored abyssal (deep-water) forms, but several species of polyps (attached sessile forms) and shallow-water medusae are now also known. The main distinguishing morphological feature in the medusoid stage is the exumbrella (the outer convex surface of the umbrella of jellyfishes), which is divided into two parts by a circular or coronal furrow: an upper central disk and a lower marginal coronal part (see illustration). The central disk is usually flat or domelike; however, in medusae of the genus Periphylla, it narrows toward the top, forming a helmetlike bell. The pedalia are marginal gelatinous thickenings, situated on the radii running from the center of the umbrella to the tentacles and the sensory organs. The pedalia are separated from one another by clefts (or radial grooves), running down the radii, that are halfway between each tentacle and rhopalium (a sensory organ). The mouth has four simple lips. The central stomach is lined by four groups of gastric filaments.
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. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews 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 17,000 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