Invertebrados: características y grupos principales (Artrópodos, Moluscos, Anélidos, Nematodos, Platelmintos, Cnidarios y Poríferos)

Apuntes

• Subtopic: Arthropods Mir Yapods • A pair of antennae. HEAD: • A pair of simple eyes. • Mouth with chewing jaw. BODY: • Segmented. • One or two pairs of legs in each segment. • Scolopendra (Escolopendra) • Millipedes (Milpiés) Characteristics: • Terrestrial invertebrates. • Breathing by tracheas. • Males and females. • NO METAMORPHOSIS. --- • Subtopic: Crustaceans CRUSTACEANS CEPHALOTHORAX: • A pair of eyes. • Chewing jaws. • Two pairs of antennae. THORAX: • 5 pairs of legs. ABDOMEN: • Segmented. Characteristics: • Breathing: gills or surface of the body. • Carnivores, filter feeders, parasites. • Males and females. • Oviparous. • Egg-larva-adult development through METAMORPHOSIS. --- • Subtopic: Arachnids ARACHNIDS CEPHALOTHORAX: • Four pairs of legs. • No antennae. • Several simple eyes. • Chelicerae: pincers that can be used to inject venom into prey. • Pedipalps: sensory appendages. ABDOMEN: Characteristics: • Terrestrial arthropods. • Breathing: by tracheas. • Usually carnivores. • Males and females. • Oviparous. --- • Subtopic: Insects INSECTS • A pair of compound eyes. HEAD: • 2-3 ocelli (simple eyes). • A pair of antennae. • Mouth with different parts depending on their di...