Lesson 14 ·Class 9 · Five Kingdom Classification · Sort Lab
Mollusca and Echinodermata
Soft bodies and spiny skins.
Sort each feature into its phylum.
Sorted 0/9
All items sorted — check each bin.
VS
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
Two facts pin down echinoderms: the water-vascular system, and being entirely marine.
What this lesson covers
Challenges to clear
- Sort every feature.
- Fill the Echinodermata column — spiny skin and tube feet.
The task
Sort each feature into its phylum.
What this lesson covers
- Mollusca — Snail, octopus, mussel: Soft, unsegmented body (Mollis means soft — the name says it.); Usually protected by a calcareous shell (Secreted by a fold of skin called the mantle.); Moves on a muscular foot (In an octopus the foot is modified into arms.); Found in the sea, in fresh water and on land (Garden snails and land slugs are molluscs too.)
- Echinodermata — Starfish, sea urchin: Skin bearing calcareous spines or plates (Echinos = hedgehog, derma = skin.); Has a water-vascular system with tube feet (Unique in the whole animal kingdom — used for movement and feeding.); Adult shows five-rayed radial symmetry (Though the larva is bilaterally symmetrical — evidence of its ancestry.); Exclusively marine — no freshwater or land species (A rare thing among animal phyla, and worth remembering.); Can regenerate a lost arm (A starfish can regrow an arm, and sometimes a whole body from one.)
Hint
Two facts pin down echinoderms: the water-vascular system, and being entirely marine.