Isoptera

Definition

A former insect order comprising termites, now taxonomically redundant. Molecular phylogenetic studies (Inward, Beccaloni & Eggleton, 2007) demonstrated that termites are highly derived, eusocial cockroaches nested within Blattodea rather than a separate order. The group is now treated as the epifamily Termitoidae or family Termitidae within Blattodea. The name derives from Greek roots meaning 'equal wings,' referring to the similar size and shape of fore- and hindwings in alate reproductives—a diagnostic feature distinguishing termites from Hymenoptera, where wing pairs differ markedly.

Etymology

From Greek ἴσος (ísos, 'equal') + πτερά (pterá, 'wings'), referring to the similarly sized fore- and hindwings of alate termites.

Example

Specimen labels and older literature frequently list termites under Isoptera, requiring taxonomic updating to Blattodea: Termitoidae or Termitidae in modern databases and publications.

Synonyms

• Termitoidae

Related Terms

• Blattodea
• Termitidae
• eusocial
• Alate
• Caste
• Incomplete metamorphosis
• Hymenoptera

Usage Notes

Isoptera persists in legacy literature, museum collections, and some regional faunas. Current practice treats termites as Blattodea: Termitoidae (epifamily rank) or places all termites in family Termitidae within Blattodea. The term remains useful for historical context and literature searches but should not be used for new taxonomic descriptions. Contrast with Hymenoptera: termites share social organization and winged reproductives with ants, bees, and wasps, but differ in wing venation, beaded (moniliform) antennae, and soft-bodied worker caste.