Question

The marine annelid is
A. Nereis
B. Hirudinea
C. Lumbricus
D. None of the above

Answer 1

Hint: Annelids are small worm-like invertebrates also known as the ringed worms or segmented
worms. They are a large phylum of extant species including ragworms, earthworms, and leeches.

Complete answer:
Annelids are a phylum of invertebrate segmented worms with over 17,000 known species that inhabit several geographical locations. Well, known species of annelids are earthworms, ragworms, and leeches. Annelids are mostly found in moist wet environments and can be considered to be parasitic or mutualistic.
Nereis is a genus belonging to the Nereididae family of polychaete worms. There are 500 – mostly
marine species within the Nereididae family are grouped into 42 genera. These worms are commonly called ragworms or clam worms. Nereis or ragworms are predominantly marine dwelling organisms that may occasionally swim upstream to rivers or even climb to land. They are found in all water depths, hiding under rocks, foraging in seaweeds, or burrowing in the mud. They are mainly omnivorous and only breed once before dying. Ragworms are important food sources for several shorebirds.

Therefore, the correct option is A.

Additional information:
Annelids have one or more body segments, each having one or more rings which are called annuli. Annelids reproduce sexually by hermaphroditic cross-fertilization and can regenerate cut off pieces of their body. Unlike sponges, which can come back together if ripped apart. They have a hydrostatic skeleton, a one-way digestion system, and bilateral symmetry.

Note: Hirudinea is a subclass of the phylum Annelida which mostly comprises the segmented leeches, they are oligochaetes that have a soft muscular body and are found on land or freshwater lakes and ponds. Lumbricus is a genus of earthworms that are commonly seen in Europe. This genus comprises nearly 700 valid species. Earthworms are also oligochaetes which are soil-dwelling annelids.