Caeculus
Dufour, 1832
rake-legged mites
Caeculus is a of large prostigmatic mites in the Caeculidae, commonly known as rake-legged mites. The genus contains approximately 20 described , predominantly distributed in North America. Members are characterized by spiniform setae on their first pair of legs, which function in prey capture. These mites are ambush of small arthropods in arid environments.
Pronunciation
How to pronounce Caeculus: /ˈkaɪkjʊləs/
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Identification
Distinguished from other caeculid by morphological characters detailed in -level keys. The spiniform rake setae on legs I are a -level trait; genus identification requires examination of additional morphological features documented in systematic analyses.
Images
Appearance
Large prostigmatic mites measuring 750–3000 µm. Legs I bear distinctive spiniform setae forming a 'rake' structure used in prey capture. Body form adapted for life on exposed soil surfaces.
Habitat
Arid and semi-arid environments with rocky or sandy substrates. Found on open exposed soil surfaces with thin hardened crusts, including brown chernozem soils in cold semi-arid steppe climates. Specific collection sites include arid southwest-facing coulee slopes and adjacent plains.
Distribution
Predominantly North American. Documented from Alberta, Canada (Medicine Hat, Writing-on-Stone Provincial Park, Waterton Lakes National Park) and southern inland British Columbia. Broader distribution includes regions where caeculids occur worldwide.
Seasonality
activity observed during hottest part of day (13:45–15:30) at temperatures ≥32°C.
Diet
Ambush of small arthropods including collembolans.
Behavior
Ambush using spiniform rake setae on legs I to capture prey. Camouflaged against substrate surfaces. activity pattern with peak activity during midday heat.
Ecological Role
of small arthropods in arid and semi-arid soil .
Similar Taxa
- ProcaeculusBoth extant in Caeculidae; Procaeculus distinguished by morphological characters and includes oldest fossil records from Cretaceous Burmese amber
- Other Caeculidae generaApproximately 9 in ; separation requires detailed morphological examination per systematic keys
More Details
Systematic history
First phylogenetic review of the conducted in 2020 using morphological character state matrix covering all 20 . No comprehensive phylogenetic treatment existed prior to this analysis.
Etymology
name derived from Latin 'caeculus' meaning 'little blind one', though this mythological reference predates the taxonomic usage for these mites.