What are the characteristics of Physalia?
Physalia physalis has a single, highly distinguishable, gas filled float (the pheumatophore), unlike many other siphonophores which rely on a group of swimming bells for floatation. Physalia physalis has contractile tentacles that can reach 10-20 m in length when extended.
What is Physalia in zoology?
Physalia is a genus of the order Siphonophorae, colonies of four specialized polyps and medusoids that drift on the surface of the Atlantic, Indian and Pacific oceans.
What is the common name of Physalia?
Portuguese man o’ war
|Portuguese man o’ war|
|Physalia physalis (Linnaeus, 1758)|
What is the class of Physalia?
HydrozoansPhysalia / ClassHydrozoa are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the colony. Wikipedia
Is Physalia a polyp or medusa?
They are mainly found in bell-shaped medusa form. Physalia and Obelia have both polyp and medusa forms and they alternate between both forms during their life cycle. The correct option is (B). Polyp phase is absent in Aurelia.
What type of symmetry will you find in Physalia?
a form of body symmetry in which the parts of an animal are arranged concentrically around a central oral/aboral axis and more than one imaginary plane through this axis results in halves that are mirror-images of each other. Examples are cnidarians (Phylum Cnidaria, jellyfish, anemones, and corals).
Where is Physalia located?
Geographic Range. This species has been found in the Atlantic Ocean, the Pacific Ocean, the Indian Ocean, the Caribbean, and the Sargasso Sea.
Is Physalia a medusa or polyp?
What is correct difference between polyp and medusa?
Polyps have a tubular shape and are fastened at their base, with the mouth facing the water at the other end of the tube. Medusa has a bell-shaped body with hanging tentacles. Polyp does not have a manubrium. The Hydrozoa class’s Medusa has a manubrium, a tube that hangs from the bell.
Does Physalia show radial symmetry?
The correct answer is Physalia. Physalia is bilaterally symmetrical. Asterias, Cucumaria, Limulus has radial symmetry.
What are the function of polyp of obelia?
Obelia polyps (= zooids) are dimorphic, there being two types in the colony. Gastrozooids are responsible for feeding, which they accomplish by capturing and ingesting zooplankton. Gonozooids are reproductive and produce medusae by asexual budding.