What is a Perisarc?

: the outer usually chitinous integument of a hydroid.

What is a Hydranth?

: one of the feeding zooids of a hydroid colony.

What is perisarc zoology?

perisarc in American English (ˈperəˌsɑːrk) noun. Zoology. the horny or chitinous outer case or covering protecting the soft parts of hydrozoans.

What is Perisarc in Obelia?

The entire colony is covered by a tough, yellow chitin secreted by the ectoderm, this covering is known as perisarc. The perisarc constitutes the exoskeleton and it covers the hydrorhiza, hydrocauli and their branches, and at the base of each polyp, it forms a clear, wine glass-shaped hydro theca.

What do you mean by Zooids?

noun, plural: zooids. (1) A cell capable of spontaneous movement and can live independently or apart from the parent organism. (2) An animal or organism in inferior developmental stages; an organism in intermediate form.

What is the function of Hydranths?

It captures minute prey by using its tentacles which contain batteries of nematocysts. The coelenteron of the hydranth communicates with the cavity of the hydrocaulus and thus the absorbed food is distributed to the entire colony.

Why obelia is Trimorphic?

It is called trimorphic because it has 3 stages in its life and these are polyp medusa and blastostyle.

What is Coenosarc in cnidaria?

From Wikipedia, the free encyclopedia. In corals, the coenosarc is the living tissue overlying the stony skeletal material of the coral. It secretes the coenosteum, the layer of skeletal material lying between the corallites (the stony cups in which the polyps sit).

What is the function of the Perisarc?

The perisarc of hydroids is a sheath of chitin, proteins and inorganics that protect the main stalk and soft tissues.

What is the meaning of the word perisarc?

[per-uh-sahrk] noun Zoology. the horny or chitinous outer case or covering protecting the soft parts of hydrozoans.

How are the four lobes of a perisarc related?

It flattens itself out into a disc-like form, becomes divided into four lobes, and covered by a cuticle ( perisarc ). Over the whole exterior a delicate pellicle—the future perisarc —now becomes secreted. The stem may contain a single coenosarcal tube (“monosiphonic”) or several united in a common perisarc (“polysiphonic”).

Is the stem of a perisarc monosiphonic or polysiphonic?

Over the whole exterior a delicate pellicle—the future perisarc —now becomes secreted. The stem may contain a single coenosarcal tube (“monosiphonic”) or several united in a common perisarc (“polysiphonic”). The genera are based upon these differences in the perisarc.