Question

Which of the following is true regarding Hirudinaria?
A. It has cephalic sucker
B. Mouth is triradiate
C. Segments are superficially subdivided
D. All of the above

Answer 1

Hirudinaria is an organism belonging to phylum Annelida in kingdom Animalia. Hirudinaria is the name of a genus of common Indian blood-sucking leeches.

Step by step answer: Body of Hirudinaria is characterized by the presence of multiple suckers. The cephalic suckers are also called oral or anterior suckers. The suckers help this organism to have a firm grip and thus facilitate its attachment to the substratum. These suckers also help in locomotion.
-The presence of a tri-radiated mouth is another character of Hirudinaria. Tri- radiated means having three parts. The mouth has three jaws situated right in the middle of the anterior sucker. As Leech is a blood-sucking organism, it uses this tri-radiated mouth and leaves a ‘Y’ mark at the site of sucking.
-It belongs to the phylum Annelida and it has a segmented body. The animals belonging to the phylum are characterized by a segmented body. This segmentation is also called metamerism. The body is internally and externally segmented into a number of parts called a segment or metamere.
-In Hirudinaria , ventral nerve cords from the central nervous system of vertebrate animals. It is homologous to the spinal cord present in vertebrates.
-This animal has a closed type of circulation, where blood flows through a system consisting of various blood vessels and is never exposed to the body cavity of the exterior. It has a true or well-developed coelom and hence is called coelomate.
Hence option D is correct.
Additional information: Not all Leeches suck blood. Every continent except Antarctica has leech present in them. Leeches are also used in medical fields where they act as mini vacuum cleaners and suck out impure or affected blood from patients.

Note: As the organism Hirudinaria belongs to phylum Annelida it has got all the characteristics and features like every organism belonging to this phylum.