Question

Match the name of the animal with one characteristic and the phylum or class to which it belongs.
(a)Petromyzon- ectoparasite- cyclostomata
(b)Ichthyophis- terrestrial- reptilia
(c)Limulus- body covered by chitinous exoskeleton- Pisces
(d)Adamsia- radially symmetrical- Porifera

Answer 1

Hint: The lamprey is a parasitic lamprey native to the Northern Hemisphere. It's often referred to as "vampire trout”. Sea lampreys are anadromous; they migrate rivers from their lake or sea environments to breed. Females deposit a large number of eggs in nests made by males in a medium-strong stream substrate.

Complete answer:
Petromyzon or sea lamprey is an ectoparasite, and they are the most primitive vertebrates alive today, called cyclostomes, which means round mouths.
The name derives from the seven outer gill slits that, along with one nostril and one eye, line each side of the lamp head segment.
Lamprey of the sea, Petromyzon marinus, breeds in freshwater. During the spawning period, the lampreys avoid feeding, conserving all their reproductive resources. After the spawning, adults die when their intestines deteriorate and the infection attacks their bodies. The larvae don't have teeth and are blind.

Additional Information: -Ichthyophis is a category of limbless amphibians.
-Limulus is a genus of horseshoe crab belonging to the Arthropoda phylum.
-Adamsia is a genus of sea anemones belonging to the Cnidaria phylum.
So, the correct answer is ‘Petromyzon- ectoparasite- Cyclostomata’.

Note: The etymology of the genus Petromyzon is petro-"stone "and myzon" sucking; "it is Latin for" sea.
Lampreys are distinguished by their anguilla-shaped body, the appearance of seven pairs of gill holes, an unusual nostril, and the lack of even fins, jaws, and scales.