ACE Insect Taxonomy & Classification 1 — Questions and Answers
Question 1: Which insect order contains all beetles, making it the largest order of insects by number of described species?
- Diptera
- Coleoptera (Correct answer)
- Lepidoptera
- Hymenoptera
Correct answer: Coleoptera
Coleoptera (beetles) is the largest insect order with over 400,000 described species, representing roughly 40% of all known insect species.
Question 2: What is the correct descending hierarchy of taxonomic classification used in entomology?
- Phylum > Class > Family > Order > Genus > Species
- Phylum > Class > Order > Family > Genus > Species (Correct answer)
- Class > Phylum > Order > Family > Species > Genus
- Kingdom > Order > Class > Family > Genus > Species
Correct answer: Phylum > Class > Order > Family > Genus > Species
The correct Linnaean hierarchy descends from Phylum > Class > Order > Family > Genus > Species, with Kingdom above Phylum.
Question 3: Insects in the order Diptera are distinguished from other winged insects by which characteristic?
- Four wings covered in scales
- Two functional wings with hindwings modified into halteres (Correct answer)
- Wings with a network of fine veins
- Hardened front wings called elytra
Correct 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.
Question 4: Which term describes insects that undergo complete metamorphosis with four life stages: egg, larva, pupa, and adult?
- Hemimetabolous
- Ametabolous
- Holometabolous (Correct answer)
- Paurometabolous
Correct answer: Holometabolous
Holometabolous insects undergo complete metamorphosis through four distinct stages — egg, larva, pupa, and adult — and include beetles, flies, wasps, and moths.
Question 5: The order Blattodea (cockroaches and termites) belongs to which broader taxonomic class?
- Arachnida
- Insecta (Correct answer)
- Chilopoda
- Myriapoda
Correct answer: Insecta
Blattodea is an order within the class Insecta, which is characterized by six legs, three body segments, and (usually) wings.
Question 6: Which characteristic is the primary defining feature of the order Hymenoptera?
- A single pair of wings with a knobbed hindwing
- Two pairs of membranous wings, often with a narrow waist (Correct answer)
- Wings covered in microscopic scales
- Piercing-sucking mouthparts in all members
Correct 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).
Question 7: In insect taxonomy, what does the suffix '-idae' indicate when applied to a taxon name?
- The taxon is an order
- The taxon is a family (Correct answer)
- The taxon is a genus
- The taxon is a subfamily
Correct answer: The taxon is a family
The suffix '-idae' denotes a family in zoological nomenclature; for example, Formicidae is the family containing all ants.
ACE Insect Taxonomy & Classification 1
Which insect order contains all beetles, making it the largest order of insects by number of described species?