Corydioidea

Saussure, 1864

Sand and Cave Cockroaches

Corydioidea is a superfamily of ( ) containing two extant : (sand cockroaches) and (cave cockroaches). Together these comprise approximately 50 and 250 . The superfamily also includes two extinct families: Liberiblattinidae and Manipulatoridae from the . Molecular dating places the origin of crown Corydioidea at the – boundary.

Damaeus by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.

Epidermoptidae by (c) Cricket Raspet, some rights reserved (CC BY), uploaded by Cricket Raspet. Used under a CC-BY license.

Psoroptidae by (c) Oleksii Vasyliuk, some rights reserved (CC BY), uploaded by Oleksii Vasyliuk. Used under a CC-BY license.

Pronunciation

How to pronounce Corydioidea: /kɔrɪdɪˈɔɪdiə/

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Habitat

Members occur primarily in hot, arid environments including sandy deserts and semi-arid regions. are strongly associated with cave (cavernicolous), found on stones, rotting matter, and animal in cave systems. Some occupy epigean environments alongside cave-dwelling .

Distribution

Worldwide distribution, with highest diversity in Asia. In China, major are concentrated in southwestern provinces (Yunnan, Sichuan, Tibet, Guangxi, Hainan) where mountainous terrain facilitates geographic isolation and . Collection records span from lowland caves (162 m elevation) to montane regions.

Life Cycle

with distinct nymphal stages. have been observed in field collections alongside in cave and terrestrial .

Behavior

Pronounced is common: males are typically winged and capable of , while females are often and flightless. Some Nocticola exhibit termitophilous associations. Specialized abdominal tergal glands in male are used for species grouping and potentially chemical communication.

Ecological Role

Cave-dwelling function as in subterranean , processing rotting matter and animal . Terrestrial species in arid contribute to in sandy and semi-arid soils.

Human Relevance

Some members of the Eupolyphaga ( ) have medicinal value in traditional Chinese medicine, particularly E. sinensis which is commercially farmed. The superfamily is generally less studied than other groups due to difficulty of collection in remote or subterranean .

Similar Taxa

BlaberoideaThe other major superfamily; distinguished by different patterns and generally more mesic preferences. Corydioidea often has reduced in females and specialized for arid or cave environments.
BlattoideaThe third superfamily; Corydioidea differs in phylogenetic placement, with molecular analyses recovering and as a distinct clade separate from Blattoidea lineages.

More Details

Phylogenetic Classification

Recent phylogenetic reconstruction using mitochondrial and nuclear gene fragments has revised the of Corydioidea. Two major clades are recognized: one consisting of (except Latindiinae), and another containing all remaining including , Latindiinae (revised status), and the newly established Ctenoneurinae. The Pseudoeupolyphaga was established in 2024 within Corydiinae.

Taxonomic Challenges

delimitation within Corydioidea is complicated by pronounced morphological convergence, particularly in like Pseudoeupolyphaga and Eupolyphaga. Male often provide limited diagnostic utility, contrary to traditional . Male coloration and patterning, along with , serve as primary diagnostic characters.

Extinct Lineages

The extinct Manipulatoridae from Myanmar amber was historically interpreted as predatory based on forelegs, though this interpretation has been revisited. Liberiblattinidae represents another extinct family within the superfamily.