Optioservus immunis
(Fall, 1925)
Optioservus immunis is a of in the , first described by Fall in 1925. It is one of thirteen Nearctic species in the , distinguished from primarily by male and elytral pattern. The species was previously known under the synonym Optioservus cryophilus.
Pronunciation
How to pronounce Optioservus immunis: /ˌɒptiˈoʊsɜrvəs ɪˈmjunɪs/
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Identification
Identification relies on examination of male , elytral patterns, and body shape. The was historically confused with due to highly variable external characters. Specific diagnostic features for O. immunis versus other Optioservus species require reference to the taxonomic revision by (1978).
Habitat
in the are obligate inhabitants of running water. O. immunis is found in lotic freshwater , though specific microhabitat preferences for this are not documented.
Distribution
North America.
Ecological Role
As a member of , contributes to decomposition of matter in freshwater and serves as for aquatic .
Similar Taxa
- Optioservus canus in the same Nearctic revision, distinguished by male and elytral pattern
- Optioservus castanipennis with overlapping distribution, requires genital examination for separation
- Optioservus cryophilusJunior synonym of O. immunis, now synonymized based on (1978)