Ecdysozoans quiz Flashcards

Myriapods are invertebrate organisms with segmented bodies and many legs, such as millipedes and centipedes.

Myriapods can have as few as 10 legs and up to 750 legs.

Crustaceans can live in both aquatic (freshwater and saltwater) and terrestrial environments.

A cephalothorax is a fused body segment that combines the head and thorax.

The carapace is a hard exoskeleton piece that acts like armor, covering the cephalothorax.

Crustaceans have 19 appendages and 2 pairs of antennae.

Crustaceans range from as small as 0.1 millimeters to as large as 3.8 meters, like the Japanese spider crab.

Hexapods are commonly known as insects.

There are over 1,000,000 species of insects.

Hexapods have three body segments: head, thorax, and abdomen.

Hexapods have compound eyes, which consist of many lenses for detecting movement.

Hexapods use spiracles and tracheal tubes for gas exchange instead of lungs.

Complete metamorphosis involves a larva stage that looks completely different from the adult, such as in butterflies.

Incomplete metamorphosis involves nymphs that look similar to adults but cannot reproduce, such as in grasshoppers.

C. elegans is a well-studied nematode in laboratory experiments, known for its fully mapped cell development.

Ecdysozoans are defined by their ability to grow incrementally by shedding their outer layer, known as the cuticle.

The cuticle is a tough external coating that can harden into an exoskeleton.

The main body segments of arthropods are called tagmata, which include the head, thorax, and abdomen.

The exoskeletons of arthropods are primarily made of chitin.

Hox genes control the development of various body segments, allowing for a wide variety of forms and functions in arthropods.

The main body cavity of arthropods is called the hemocoel, and it contains hemolymph.

Chelicerata are arthropods with claw-like feeding appendages, lack antennae, and have simple eyes.

The two tagmata of arachnids are the cephalothorax and the abdomen.

Myriapods are invertebrates like millipedes and centipedes, characterized by their segmented bodies and numerous legs.

Crustaceans can be found in both aquatic (freshwater and saltwater) and terrestrial environments.

Hexapods, commonly known as insects, are characterized by having three pairs of walking legs on their thorax.

In complete metamorphosis, the larva looks completely different from the adult, while in incomplete metamorphosis, the nymph resembles the adult but cannot reproduce.

Spiracles are openings in the cuticle that pull in air for gas exchange through tracheal tubes.