What is the Difference Between Starfish and Brittle Star?

Starfish and brittle stars are both marine invertebrates belonging to the phylum Echinodermata, but they have distinct differences in appearance and bodily functions. Here are the main differences between the two:

Appearance:

• Starfish have thick, triangular-shaped arms that are widest where they connect to the central body.
• Brittle stars have thinner, more whip-like arms that connect to a distinct central disc.

Body Shape:

• Starfish characteristically have a central body with arms radiating from it.
• Brittle stars have a much smaller central disc and no anus, with wastes being eliminated through the mouth.

Mode of Movement:

• Starfish move using tube feet.
• Brittle stars move by flapping their arms in the form of walking.

Feeding:

• Both starfish and brittle stars are capable of regrowing their arms if they are broken or eaten.
• Brittle stars feed on plankton, detritus, coral-shed mucus, bottom detritus, mollusks, and worms.

In summary, starfish and brittle stars may look similar due to their star-shaped appearance, but they have distinct differences in their arms, body shape, mode of movement, and feeding habits.

Comparative Table: Starfish vs Brittle Star

Here is a table highlighting the differences between starfish and brittle stars:

Both starfish and brittle stars belong to the phylum Echinodermata and are marine invertebrates, but they have distinct characteristics that set them apart.