Tag: zoology

Pontobdella is segmented worm under the phylum Annelida. It is a marine leech which is ectoparasite on elasmobranchs and is commonly called as 'skate sucker'.
Therefore, the correct answer is option B.

Nephridia is an organ involved in the excretory system. It is the characteristic feature of leech. Their bodies are much more solid as the spaces in their coelom are dense with connective tissues. In leeches, the botryoidal tissue is composed of two different cell types. The granular botryoidal cells and flattened endothelial-like cells which contains a brown pigment and may serve an excretory function. Leeches use a combination of mucus and suction to stay attached and secrete an anticoagulant enzyme known as hirudin into the host's blood streams. 

Chaetopterus, commonly known as paddle worm from class Polychaeta. It is worldwide in distribution. It feeds on small organisms, true filter feeders. The body is divided into an anterior region, middle region and a posterior region. Parapodia have modified accordingly to their function. They are modified into pumping fans, sucking discs and food ball organs and asexual reproduction by transverse fission. So, the correct answer is option B.

Acanthobdella forms a connecting link between Oligochaeta and Hirudinea. It is mostly parasitic on fins of salmon fishes. Body comprises of thirty segments only. Its body cavity is spacious and completely divided by septa, vascular system is composed of dorsal and ventral vessel. Hence, option B is correct.

In leeches, the botryoidal tissue is composed of two different cell types-granular botryoidal cells and flattened endothelial-like cells containing a brown pigment and may serve an excretory function. Hence, option C is correct answer.

Hirudinaria is an Indian cattle leech. This is the fresh water species. It is cosmopolitan. It feeds on the blood of frog, animals and men.