Insecta Class Overview

Animals found in Hexapoda include various insects such as honeybees and butterflies.

The subphylum contains insects who have a body with three tagmata (a head, thorax, and abdomen), one pair of antennae, and three pairs of walking legs.

Class Insecta is the largest and most diverse class. Animals in this class inhabit all terrestrial and freshwater habitats.

<p>There are about 800,000 species of insects that have been described across the world.</p> Signup and view all the answers

<p>Insects make up 10% of all described species on the planet.</p> Signup and view all the answers

<p>Insects make up 80% of all described animal species on the planet.</p> Signup and view all the answers

<p>Hymenoptera (bees, wasps, etc.), Diptera (flies), and Coleoptera (beetles).</p> Signup and view all the answers

<p>Odonata (dragonflies), Orthoptera (grasshoppers), Isoptera (termites), Coleoptera (beetles), Mantodea (mantids), Lepidoptera (butterflies), Hymenoptera (bees), Thysanura (silverfish), Blattodea (cockroaches), and Diptera (flies).</p> Signup and view all the answers

<p>Entomology</p> Signup and view all the answers

<p>Insects first invaded land during the Devonian Period; the first land arthropods were found among primitive plant fossils.</p> Signup and view all the answers

<p>When an existing trait in an individual adapts to a new role with little change in structure.</p> Signup and view all the answers

<p>Tracheal gill theory: the tracheal gills used for gas exchange in water eventually changed into wings.</p> Signup and view all the answers

<p>General external anatomy of an insect includes 1 pair of antennae, a head, a thorax, and an abdomen.</p> Signup and view all the answers

<p>Flight allowed insects to access a new niche, ensuring their survival in the Devonian Period and decreasing predation.</p> Signup and view all the answers

<p>When flight muscles move inside the insect, the body temperature increases.</p> Signup and view all the answers

<p>Direct flight involves muscles attached directly to the wings, while indirect flight uses longitudinal muscles that change the shape of the exoskeleton.</p> Signup and view all the answers

<p>Insects move by jumping, crawling, and walking on water.</p> Signup and view all the answers

<p>Mouthparts consist of a labrum, a pair of mandibles, maxillae, a labium, and a hypopharynx.</p> Signup and view all the answers

<p>Aphid mouthparts suck juices from plant leaves, while wasps have mouthparts adapted for carnivory.</p> Signup and view all the answers

<p>The digestive system includes a foregut, midgut, and hindgut. The gastric ceca increases the surface area for nutrient absorption.</p> Signup and view all the answers

<p>Malpighian tubules allow for the excretion of nitrogenous products and secrete fluids reabsorbed into hemolymph.</p> Signup and view all the answers

<p>Uric acid is the waste product of nitrogen metabolism and is important for conserving water.</p> Signup and view all the answers

<p>Gas exchange occurs via spiracles opening into tracheal tubes that lead to smaller tracheoles distributing gas throughout the body.</p> Signup and view all the answers

<p>Insects have an open circulatory system that transports hemolymph but not oxygen.</p> Signup and view all the answers

<p>Insects have ganglia connected to a ventral nerve cord, often said to be 'hard-wired'.</p> Signup and view all the answers

<p>Compound eyes consist of numerous ommatidia, each with a separate lens interpreting signals into a single image.</p> Signup and view all the answers

<p>Ocelli are simple eyespots that detect light.</p> Signup and view all the answers

<p>These hairs pick up chemical and tactile signals used within the sensory system.</p> Signup and view all the answers

<p>Tympanal organs detect sound frequency and are located on the lateral sides.</p> Signup and view all the answers

<p>Insects reproduce sexually; asexual reproduction is less common and insects are dioecious.</p> Signup and view all the answers

<p>No metamorphosis involves young that are similar to adults (e.g., silverfish); incomplete metamorphosis has nymphs and external wing growth (e.g., grasshoppers); complete metamorphosis has larva, pupa, and adult stages (e.g., butterflies).</p> Signup and view all the answers

<p>Grasshoppers undergo incomplete metamorphosis with three stages: egg, nymph, and adult.</p> Signup and view all the answers

<p>Beetles undergo complete metamorphosis with four stages: egg, larva, pupa, and adult.</p> Signup and view all the answers

<p>Both undergo metamorphosis, but beetles go through complete metamorphosis while grasshoppers undergo incomplete metamorphosis.</p> Signup and view all the answers

<p>Metamorphosis helps eliminate competition between young and old insects, allowing them to occupy different niches.</p> Signup and view all the answers

<p>Some insects live in colonies with caste differentiation; honeybees have a queen, drones, and workers.</p> Signup and view all the answers

<p>Members have numerous appendages, one pair of antennae, a pair of mandibles, two pairs of maxillae, and tagmata includes head, thorax, and abdomen.</p> Signup and view all the answers

<p>Orders include Thysanura, Ephemeroptera, Odonata, Blattodea, Mantodea, Orthoptera, Dermaptera, Isoptera, Hemiptera, Coleoptera, Lepidoptera, Diptera, Siphonaptera, and Hymenoptera.</p> Signup and view all the answers