Heterelmis glabra

(Horn, 1870)

riffle beetle

Heterelmis glabra is a of riffle beetle in the Elmidae, found in Central America and North America. The largest known occur in springs associated with the upper Devils River in south-central Texas. As a spring-adapted organism, it has life-history patterns requiring surface components, making it vulnerable to changes in spring flow. The species has been studied using N-mixture models to assess abundance and distribution across spring sources.

Pronunciation

How to pronounce Heterelmis glabra: /ˌhɛtəˈrɛlmɪs ˈɡlæbrə/

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Habitat

Spring sources in the Devils River watershed of south-central Texas, specifically orifice, upwelling, group of springs, or seep type springs. Baseflows are entirely attributable to groundwater primarily sourced from the Edwards-Trinity and Edwards Aquifers.

Distribution

Central America and North America; largest in springs associated with the upper Devils River, within Dolan Falls Preserve and the Devils River State Natural Area, south-central Texas, USA.

Life Cycle

Both and larval stages occur in spring sources. As with other Elmidae, larvae are aquatic with gills, while adults possess a —an air bubble held by body hairs that allows underwater respiration by extracting oxygen from the water.

Ecological Role

Spring-associated serving as a potential indicator of aquifer and spring health. Baseline data important for measuring impacts to spring-associated species from natural or anthropogenic changes.

Human Relevance

Subject of conservation monitoring due to vulnerability of spring to groundwater extraction, drought, and pollution. studies using N-mixture models have been recommended for regular monitoring of 32 spring sites to track abundance changes.

Similar Taxa

  • Heterelmis comalensis in same , also endangered and spring-associated in Texas Edwards Aquifer system; distinguished by specific spring system location and subtle morphological differences requiring expert identification.
  • Heterelmis cf. glabraTaxonomically uncertain designation used in some studies when identification to level is provisional; may represent H. glabra or closely related requiring further taxonomic clarification.

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