Chthoniidae

Daday, 1888

chthoniid pseudoscorpions

Genus Guides

2

Chthoniidae is a of pseudoscorpions within the superfamily Chthonioidea, containing over 600 in approximately 30 . The family has undergone taxonomic revision, with former families Tridenchthoniidae and Lechytiidae now treated as (Tridenchthoniinae and Lechytiinae). Fossil species are known from Baltic, Dominican, and Burmese amber. Members exhibit diverse preferences, with many species adapted to subterranean environments while others occupy surface habitats including leaf litter and soil.

Chthonius tetrachelatus by (c) davidfdz_b82, some rights reserved (CC BY), uploaded by davidfdz_b82. Used under a CC-BY license.Chthonius tetrachelatus by (c) Evrytte Carlson, some rights reserved (CC BY), uploaded by Evrytte Carlson. Used under a CC-BY license.Chthonius tetrachelatus by (c) Evrytte Carlson, some rights reserved (CC BY), uploaded by Evrytte Carlson. Used under a CC-BY license.

Pronunciation

How to pronounce Chthoniidae: /ˈkθɒni.aɪ.iːdiː/

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

Identification

Distinguished from other pseudoscorpion by a combination of chelal trichobothrial patterns and genital atrium structure. The family encompasses three with differing morphological characteristics: Chthoniinae (including the Chthonius), Tridenchthoniinae, and Lechytiinae. Specific identification requires examination of chelal , trichobothrial positions, and male genital structures.

Images

Habitat

Highly variable across and . Epigean occur under topsoil, in leaf litter layers, under rocks and stones. Hypogean (cave-dwelling) species are common, particularly in karst regions; some are troglobites lacking and pigmentation. The genus Lagynochthonius is documented from both surface and cave . Tyrannochthonius species show global association with caves, including records from Brazil, China, and Australasia.

Distribution

with strong representation in temperate and tropical regions. Chthonius ranges from Europe to Iran, North Africa, and North America with one cosmopolitan . Tyrannochthonius occurs from Brazil to the southern USA, with extensions to Australasia, Africa, and Hawaii. Lagynochthonius is distributed across Australasia and Africa. Mundochthonius spans Eurasia, North America, and the Dominican Republic. New Zealand, Australia, and Chile including Maorichthtonius, Sathrochthonius, and Chiliochthonius.

Behavior

Males of at least Chthonius ischnocheles produce in the absence of females, depositing them on the substrate for indirect sperm transfer. The spermatophore consists of a stalk with lateral collars and a sperm-containing capsule; a secretion from lateral glands may function as a to attract females.

Ecological Role

Predatory arthropods in soil and litter ; cave-dwelling contribute to specialized subterranean . Specific ecological functions remain poorly documented for most species.

Human Relevance

Some cave-dwelling are threatened by mining projects and destruction, particularly in karst regions of Brazil and China. The contributes to biodiversity assessments in cave conservation prioritization.

Sources and further reading