Insect Taxonomy & Classification Flashcards

Which insect order contains all beetles, making it the largest order of insects by number of described species?

Answer: Coleoptera

Coleoptera (beetles) is the largest insect order with over 400,000 described species, representing roughly 40% of all known insect species.

What is the correct descending hierarchy of taxonomic classification used in entomology?

Answer: Phylum > Class > Order > Family > Genus > Species

The correct Linnaean hierarchy descends from Phylum > Class > Order > Family > Genus > Species, with Kingdom above Phylum.

Insects in the order Diptera are distinguished from other winged insects by which characteristic?

Answer: Two functional wings with hindwings modified into halteres

Diptera (true flies) have only two functional wings; their hindwings are reduced to small club-shaped balancing organs called halteres.

Which term describes insects that undergo complete metamorphosis with four life stages: egg, larva, pupa, and adult?

Answer: Holometabolous

Holometabolous insects undergo complete metamorphosis through four distinct stages — egg, larva, pupa, and adult — and include beetles, flies, wasps, and moths.

The order Blattodea (cockroaches and termites) belongs to which broader taxonomic class?

Answer: Insecta

Blattodea is an order within the class Insecta, which is characterized by six legs, three body segments, and (usually) wings.

Which characteristic is the primary defining feature of the order Hymenoptera?

Answer: Two pairs of membranous wings, often with a narrow waist

Hymenoptera (ants, bees, wasps, and sawflies) typically have two pairs of membranous wings, and many species in the suborder Apocrita have a distinctive narrow 'waist' (petiole).

In insect taxonomy, what does the suffix '-idae' indicate when applied to a taxon name?

Answer: The taxon is a family

The suffix '-idae' denotes a family in zoological nomenclature; for example, Formicidae is the family containing all ants.