Caecidotea

Caecidotea species are distinguished from other asellid genera by combinations of pleopod characteristics: protopod shape and retinacula number on pleopod I, exopod setation patterns on pleopod III, and spine arrangements on pleopod IV margins. Subterranean species typically show reduced or absent eyes, depigmented bodies, and elongated appendages compared to surface-dwelling relatives. Species-level identification requires examination of male pleopod morphology.

Freshwater aquatic environments including ponds, streams, springs, caves, and groundwater aquifers. Some species are obligate subterranean inhabitants restricted to cave and karst systems; others are surface-dwelling in lentic and lotic habitats.

North America, with records from the United States (including Maryland, Kansas, Vermont) and Mexico (western Trans-Mexican Volcanic Belt, Jalisco).

Detritivore; feeds on decaying leaf material and associated microbial communities.

• Acanthocephalus dirus - intermediate hostAcanthocephalan parasite; infection modifies host antipredator behavior, refuge use, and mating behavior

Direct development without free-living larval stages; females carry eggs in brood pouch (marsupium). Some species exhibit continuous reproduction with gravid females present year-round.

Antipredator behavior varies among species: C. intermedius shows modified refuge use when infected by parasites, while C. communis exhibits cathemeral activity (distributed throughout 24-hour cycle) and insensitivity to predatory fish chemical cues. Subterranean species may track saturated zones below water table.

Intermediate host for acanthocephalan parasites; parasite-induced behavioral modifications may influence food web dynamics by altering predation susceptibility. Detritivore activity stimulates bacterial abundance and activity in sediment systems.

Subject of ecological research on parasite manipulation of host behavior, subterranean ecosystem function, and salinization impacts on freshwater communities. Indicators of groundwater quality and ecosystem integrity.

• LirceusCo-occurs in freshwater habitats; distinguished by pleopod morphology and habitat preferences
• AsellusEuropean genus in same family; Caecidotea is the primary North American asellid genus

• freshwater isopod
• detritivore
• parasite host
• subterranean
• acanthocephalan intermediate host
• behavioral manipulation
• North America

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The ecology of a subterranean isopod, Caecidotea tridentata
• Modification of Antipredator Behavior of Caecidotea Intermedius by Its Parasite Acanthocephalus Dirus
• Cathemerality and Insensitivity to Predatory Fish Cues in Pond Isopods (Caecidotea communis)
• Effects of Acanthocephalus dirus (Acanthocephala) on Morphometrics and Reproduction of Caecidotea intermedius (Crustacea: Isopoda)
• Parasite-related modification of mating behaviour and refuge use in the aquatic isopod Caecidotea intermedius: neurological correlates
• On the ecology of Caecidotea williamsi Escobar-Briones & Alcocer (Crustacea: Isopoda: Asellidae) from Alchichica saline lake, Central Mexico
• A synopsis of the subterranean asellids of Maryland, U.S.A., with description of Caecidotea alleghenyensis, new species (Crustacea: Isopoda: Asellota)
• PARASITE-RELATED PAIRING SUCCESS IN AN INTERMEDIATE HOST, CAECIDOTEA INTERMEDIUS (ISOPODA): EFFECTS OF MALE BEHAVIOR AND REPRODUCTIVE PHYSIOLOGY
• Investigating the effects of increased salinity on leaf litter decomposition and mortality of an aquatic invertebrate detritivore (Caecidotea sp.)
• A new species of Caecidotea (Crustacea: Isopoda: Asellidae) from a well in the western slope of Mexico, with occurrence records of C. alvarezi