Which order name was proposed 11 days after Microcoryphia in 1904?

• A. Ephemeroptera
• B. Odonata
• C. Archaeognatha
• D. Zygentoma

Answer: (C)

Insect taxonomy at the turn of the 20th century often split the most primitive wingless lineages based on jaw structure. After Microcoryphia was named in 1904, a second name was proposed soon after to distinguish the other primitive jumping bristletails by their distinct mouthparts. That name, Archaeognatha, literally means ancient jaws, highlighting their primitive monocondylic mandibles (a single articulation of the jaw) which set them apart from other related groups. This morphological feature is a defining trait that researchers use to classify them as a separate order, making Archaeognatha the natural follow-up name to Microcoryphia in that historical sequence. The other options refer to different insect groups or do not reflect the rapid two-term naming event that occurred in 1904.