3 Questions
Based on the text, what is the meaning of the scientific name 'Blatta'?
An insect that shuns the light
What is the relationship between termites and 'true' cockroaches according to recent genetic evidence?
Termites evolved directly from 'true' cockroaches
What distinguishes fossil roachoids from modern cockroaches?
They had long external ovipositors
Study Notes
Cockroach Overview
- Belong to the order Blattodea (Blattaria)
- There are approximately 4,600 cockroach species, with about 30 associated with human habitats
Evolution and History
- Ancestors of cockroaches, known as "roachoids", originated during the Carboniferous period, around 320 million years ago
- Early ancestors lacked internal ovipositors, a feature present in modern cockroaches
Characteristics
- Generalized insects with no special adaptations
- Have chewing mouthparts
- Probably among the most primitive of living Neopteran insects
- Can tolerate a wide range of climates, from Arctic cold to tropical heat
- Tropical cockroaches are often larger than temperate species
Classification and Relationships
- Not a monophyletic group, as termites are nested within the group
- Some cockroach groups are more closely related to termites than to other cockroaches
- Blattaria is paraphyletic
- Both cockroaches and termites are included in Blattodea
Social Structure
- Some species, like the German cockroach, have an elaborate social structure
- Features of this structure include common shelter, social dependence, information transfer, and kin recognition
Test your knowledge about the ancient and pervasive insects known as cockroaches. Learn about their history, behavior, and association with human habitats.
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