🪳 Order Dictyoptera and Mantidae

Dictyoptera includes two familiar but very different insect groups: cockroaches and praying mantids. They share broad order-level characters such as tegmina and ootheca formation, but they differ strongly in body form, feeding habit, and agricultural importance.

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Meaning and General Characters of Dictyoptera

Dictyoptera has also been referred to by older names such as Oothecaria and Blattiformia.

• Dictyon means network
• ptera means wings

Common representatives are cockroaches and praying mantids.

General characters of the order:

• head usually hypognathous
• antennae filiform
• mouthparts chewing type
• tarsi five-segmented
• forewings leathery and somewhat thickened, called tegmina
• hindwings broad, membranous, and folded fan-like below the forewings
• cerci short and many-segmented
• eggs enclosed in an ootheca

Tegmina, chewing mouthparts, filiform antennae, and ootheca formation are the most useful order-level identifiers of Dictyoptera.

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Major Division of the Order

Dictyoptera is divided into two important groups:

1. Blattaria - cockroaches
2. Mantodea - praying mantids

The two emphasized families here are:

• Blattidae
• Mantidae

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Blattidae and Mantidae Compared

Character	Blattidae	Mantidae
Head movement	Not freely mobile in all directions	Freely mobile in all directions
Head position	Hidden by pronotum	Pronotum does not cover head
Ocelli region	Two fenestrae occur in place of ocelli	Three ocelli present
Pronotum	Shield-like	Elongated
Legs	Cursorial and adapted for running	Forelegs raptorial; middle and hind legs mainly for walking
Gizzard	Strongly armed with chitinous teeth	Chitinous teeth absent
Mating behavior	Female does not devour male	Female may devour male
Ootheca	Chitinous egg case	Eggs enclosed in foamy ootheca that later solidifies
Nymphal habit	Not cannibalistic	Cannibalistic tendency present
Mimicry	Usually absent	Leaf and flower mimicry common
Feeding habit	Omnivorous	Carnivorous
Habitat	Houses, dead wood, litter, sheltered places	Mostly outdoor habitats
Economic importance	Harmful through contamination of food, clothes, and paper	Beneficial predators of moths, flies, grasshoppers, and caterpillars
Example species	Periplaneta americana	Mantis religiosa

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Summary Cheat Sheet

• Dictyoptera includes cockroaches and praying mantids.
• Important order characters are chewing mouthparts, filiform antennae, tegmina, membranous hindwings, short cerci, and ootheca formation.
• The two major groups covered here are Blattaria and Mantodea.
• Blattidae are typically running, omnivorous, household-associated insects and are usually harmful.
• Mantidae have raptorial forelegs, mobile heads, carnivorous habit, and are generally beneficial predators.
• Example species are Periplaneta americana in Blattidae and Mantis religiosa in Mantidae.

References

2 sources • [1] [2]

[1]

Fundamentals of Entomology

[2]

Insect Morphology and Systematics