Ischyropsalididae

Simon, 1879

Ischyropsalidid Harvestmen

Ischyropsalididae is a of () comprising 35 described across three : Acuclavella (thorn harvestmen of North America), Ceratolasma, and Ischyropsalis (predominantly European). The family exhibits a disjunct distribution spanning Europe and western North America. Several species are troglophilic, inhabiting cave systems with documented to subterranean environments including seasonal activity patterns and microhabitat specialization.

Acuclavella shoshone by (c) Jeremiah Degenhardt, some rights reserved (CC BY), uploaded by Jeremiah Degenhardt. Used under a CC-BY license.

Acuclavella by (c) Casey H. Richart, some rights reserved (CC BY), uploaded by Casey H. Richart. Used under a CC-BY license.

Pronunciation

How to pronounce Ischyropsalididae: /ˌɪskiroʊpˌsælɪˈdɪdi/

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Identification

-level identification relies on morphological characters of the , , and . Males are distinguished by genital characters and the shape of cheliceral and pedipalpal . Females are distinguished by cheliceral spination patterns. -level discrimination within Ischyropsalis requires examination of these structures; for example, Ischyropsalis dentipalpis and I. lithoclasica are species separable by these features. Acuclavella species (thorn ) are restricted to North America and can be distinguished from the primarily European Ischyropsalis by geographic distribution.

Images

Habitat

Subterranean environments including ice caves and scree-covered cave sections. Documented from rocky debris substrates with high humidity and cold temperatures. Some are troglophilic, maintaining in caves while exhibiting seasonal surface activity.

Distribution

Europe and North America. European records include the Italian Prealps (Eastern Italian Prealps, Aosta Valley, Bergamo Province), Spain, and Switzerland. North records include western North America (Acuclavella ).

Seasonality

Surface activity limited to warm seasons in troglophilic . Seasonal abundance patterns documented in cave-dwelling .

Behavior

Troglophilic exhibit uneven spatial distribution within caves, with highest abundance in scree-covered sections. involves secretion presentation (documented in Ischyropsalis, cited from Martens 1969b). Coexistence of congeneric troglophilic species documented: Ischyropsalis ravasinii and I. strandi observed in the same cave system.

Ecological Role

Coexists with multiple in cave systems; at least seven additional harvestman species recorded co-occurring with Ischyropsalis ravasinii in Buso del Valon ice cave.