How does Obelia reproduce?
At this stage, the Obelia medusa swim freely and reproduce sexually by releasing either eggs or sperm into the water. Upon fertilization, the resultant zygote develops into a free-swimming larva (plural: larvae) covered in cilia, or tiny hairs. This larva uses the cilia to swim while developing.
What is the function of Obelia?
The umbrella shaped creatures have tentacles covered in nematocysts and suctorial pads that assist in capturing prey. Reproduction of Obelia medusae occurs sexually, eggs and sperm uniting to become small larvae surrounded by cilia.
In what form does Obelia exist?
Through its life cycle, Obelia take two forms: polyp and medusa. They are diploblastic, with two true tissue layers—an epidermis (ectodermis) and a gastrodermis (endodermis)—with a jelly-like mesoglea filling the area between the two true tissue layers.
What is Hydrotheca in Obelia?
The bell or goblet shaped hydrotheca lacks an operculum, but contains a diaphragm at the base and changes to a brown color over time. The rim of the hydrotheca is smooth or softly toothed and can be used to distinguish O. dichotoma from other Obelia species.
How does obelia produced medusa?
The polyp asexually produces medusae, or jellyfish. Obelia medusae release sperm or eggs into the surrounding water, and the resulting ciliated larva eventually metamorphoses to produce a branching colony of polyps.
How can we identify obelia?
[Obelia-medusa] Umbrella flat, with velum minute or lacking (authorities differ). Stomach short, with quadrangular base, without peduncle; mouth with four short simple lips. Radial canals four, straight; they and ring canal narrow, the latter hard to discern.
How do you identify Obelia?
How does Obelia produced Medusa?
How does Obelia produced medusa?
Why obelia is called Trimorphic?
It is called trimorphic because it has 3 stages in its life and these are polyp medusa and blastostyle.
How do you identify obelia medusa?
Description: The Obelia dichotoma medusa is a small hydromedusa with the bell diameter greater than its height. It has no ocelli. The manubrium is short. More than 16 unbranched tentacles, all about the same size, are distributed evenly along the margin of the bell.
How do you identify obelia?