Lab invertebrates II

Dorsal

Backside

Ventral

Belly side

Anterior

Front head or end

Posterior

Rear end

How do filter feeding and deposit feeding differ?

Filter feeders capture particles suspended in water. Deposit feeders obtain organic material from sediment.

What are the three basic parts of a mollusc?

Muscular foot, visceral mass, and mantle.

Bivalvia (mollusc class)

Clams, mussels, oysters. Foot often used for burrowing or anchoring; filter feeding. Two hinged halves of the shell. (Gas exchange and filter feeding). Their gills produce gas exchange and filter feeding. Mucus and cilia capture food. LACK RADULA

Cephalopoda (mollusc class)

Octopuses, squids, Nautilus. Absent shell. Foot modified into arms, tentacles where present, and a funnel. Closed circulatory system

Polyplacophora (mollusc class)

Chitons. Eight overlapping plates shells. Broad foot attaches to surfaces; radula scrapes food.

Adductor muscles

2 shells halves together, closing the shell.

Labial palps

Flaps near the mouth that sort food and help direct suitable particles into the mouth.

Anthropods

Jointed appendages, segmented bodies, and an exoskeleton.

Chelicerata (anthropoda)

Feeding appendages called chelicerae; no antennae. Spiders, mites, ticks, horseshoe crabs

Myriapoda: Chilopoda (anthropoda)

One pair of legs per trunk segment. Centipedes

Myriapoda: Diplopoda (anthropoda)

Usually two pairs of legs per apparent trunk segment. Millipedes

Crustacea (anthropoda)

Two pairs of antennae; many aquatic forms use gills. Crayfish, crabs, shrimp, isopods.

Hexapoda (anthropoda)

Six legs; head, thorax, and abdomen. Insects.

Echinoderms

(pentaradial symmetry). Secondary radial symmetry.

Include sea stars (Asteroidea)  relatively broad arms that blend inside the central disk, brittle stars (ophiuroidea) slender flexible arms separated by a central disk, sea urchins (echinoidea) a skeleton forming a test, no arms and sea cucumbers (holothuroidea) an elongated body with a modified five-part arrangement. 

HAS An endoskeleton, meaning an internal skeleton. A water vascular system. Tube feet.

What are the crystalline style and gonad? 

The crystalline style is a rod in the stomach that helps digestion. A gonad is an organ producing eggs or sperm.