Archostemata

Classification

Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Coleoptera
Suborder: Archostemata

Pronunciation

How to pronounce Archostemata: /ˌɑːrkoʊˈstɛmətə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Tenomerga cinerea 91589530 by Annika Lindqvist. Used under a CC BY 4.0 license.

Micromalthus debilis by David R. Maddison. Used under a CC BY-SA 3.0 license.

Micromalthus debilis larva by Daniel K. Young. Used under a CC BY 4.0 license.

Tenomerga cinerea (45956029454) by Christina Butler from Georgia, United States. Used under a CC BY 2.0 license.

Tenomerga cinerea P1450733a by
xpda. Used under a CC BY-SA 4.0 license.

Tenomerga cinerea 89970821 by Sam Kieschnick. Used under a CC BY 4.0 license.

Summary

The Archostemata comprise a small group of beetles with ancient lineage and primitive characteristics, including five families and ongoing debates in their classification and evolution.

Physical Characteristics

Smallest suborder of beetles, with primitive characteristics. Antennae may be thread-shaped (filiform) or moniliform (string of beads).

Identification Tips

Look for primitive features and small size; only beetles where both sexes are paedogenic include Micromalthus debilis.

Distribution

Globally, with a focus on areas where the five extant families are present.

Reproduction

Both sexes of Micromalthus debilis are paedogenic, indicating unusual reproductive traits within the suborder.

Evolution

Modern archostematans are considered a monophyletic group and were more diverse during the Mesozoic era. Their evolutionary success is limited compared to other Coleoptera due to physiological traits and competition.

Similar Taxa

Myxophaga
Protocoleopterans

Misconceptions

Some authors use the term "Archostemata" to include both modern archostematans and stem-group beetles, leading to confusion.