Saldula opacula

(Zetterstedt, 1838)

shore bug

Saldula opacula is a of in the , first described by Zetterstedt in 1838. It belongs to the Saldula, which comprises small predatory commonly found in moist near water bodies. The species has a broad distribution spanning multiple continents, with confirmed records from Europe, Northern Asia, and North America. Like other members of the family Saldidae, it is adapted to shoreline environments where it hunts small .

Saldula opacula by (c) Konstantin Grebennikov, some rights reserved (CC BY), uploaded by Konstantin Grebennikov. Used under a CC-BY license.

Pronunciation

How to pronounce Saldula opacula: /sælˈduːlə oʊˈpækjʊlə/

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Identification

Saldula opacula can be distinguished from through examination of male genitalic structures, particularly the shape of the and parandria. Within the Saldula-Micracanthia complex, identification relies heavily on subtle differences in genitalic and somatic characters. In China, S. opacula is one of 19 recorded species and can be separated from similar using the diagnostic characters and provided by Vinokurov (2024). The species has been associated with the 'opacula species group' in comparative taxonomic studies.

Images

Appearance

Members of the Saldula are small, compact typically measuring 3-5 mm in length. They possess the characteristic of , with the portion thickened and leathery and the portion membranous. The body is generally oval to elongate-oval in shape, with relatively long legs adapted for running on moist substrates. Coloration tends toward dark to black, often with pale markings on the hemelytra or . The is broad with large, prominent . Specific diagnostic characters for S. opacula include features of the male and parandria, as documented in taxonomic treatments.

Habitat

in the , including Saldula , are characteristically found in moist associated with water bodies. Typical habitats include margins of ponds, lakes, streams, and rivers, as well as wet meadows, marshes, and other damp environments. The species has been photographed in typical saldid habitats as part of taxonomic documentation. Specific microhabitat preferences for S. opacula have not been separately documented from those of the generally.

Distribution

Saldula opacula has a broad distribution spanning the Holarctic region. It is recorded from Europe, Northern Asia (excluding China), and North America. Within China, it is one of 19 documented Saldula . GBIF distribution records confirm its presence in Europe & Northern Asia and North America.

Ecological Role

As a member of the , Saldula opacula functions as a small in shoreline . contribute to the regulation of of small in their and serve as for larger and other predators.

Similar Taxa

Saldula pallipesBoth are widespread Holarctic Saldula with overlapping distributions; separation requires examination of male genitalic structures
Saldula saltatoriaAnother widespread congeneric with similar preferences; distinguished by subtle differences in and body proportions
Micracanthia speciesRelated within the Saldula-Micracanthia complex; historically confused with Saldula and requiring careful examination of somatic characters and for proper separation

More Details

Taxonomic history

Originally described as Salda opacula by Zetterstedt in 1838, this was later transferred to the Saldula. The genus Saldula was established by Van Duzee in 1914 and currently contains numerous species distributed across the Northern Hemisphere.

Research context

Recent taxonomic work on Chinese Saldula (Vinokurov 2024) has provided updated diagnostic characters and photographic documentation for S. opacula, contributing to improved identification capabilities for this and related in the region.