Elaphrus viridis

G.Horn, 1878

Delta Green Ground Beetle

Elaphrus viridis is a small, metallic-green to a restricted region in Solano County, California. It is closely associated with vernal pool , where its is tied to seasonal flooding and drying patterns. The is federally listed as threatened and IUCN Critically Endangered due to its extremely limited range and habitat loss. are active during the wet season, emerging in January and becoming by May when pools dry.

Elaphrus viridis by (c) Pacific Southwest Region U.S. Fish and Wildlife Service，保留部分权利（CC BY）. Used under a CC-BY license.

Elaphrus viridis01 by Kipling Will. Used under a CC BY 3.0 license.

Elaphrus viridis by USFWS Endangered Species. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Elaphrus viridis: /ɛˈlæf.rəs ˈvɪr.ɪ.dɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other Elaphrus by the lack or reduction of circular pits on the . The metallic green coloration with bronze spots separates it from most other in its range. Its small size and vernal pool association provide additional diagnostic context. Similar superficial appearance to (Cicindelinae), but Elaphrus lacks the characteristic large and elongated legs of that .

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Habitat

Vernal pool grasslands and adjacent upland areas. Specifically associated with the edges of vernal pools, nearby trails, roads, and ditches. Occupies open with low vegetation where it can utilize against spring grass. Surrounding grasslands may also support , though is difficult due to the 's cryptic .

Distribution

to Solano County, California, USA. Restricted to the Jepson Prairie region south of Dixon. Historically may have occurred more broadly throughout the Central Valley, but current confirmed range is extremely limited. Protected at Jepson Prairie Preserve; other known localities occur on public land.

Seasonality

emerge in January following winter rains that fill vernal pools. Active through the wet season until entering dormancy in approximately May, coinciding with pool desiccation. This seasonal pattern represents an to Mediterranean climate conditions and vernal pool hydrology.

Diet

Actively hunts soft-bodied . Based on congeneric feeding habits, likely preys primarily on (), though this specific dietary preference has not been directly confirmed for E. viridis.

Life Cycle

with one per year. Females produce offspring during the active season from January through September. Developmental stages correspond to the availability of vernal pool , with dormancy during the dry summer months.

Behavior

Cryptic including hiding beneath low vegetation. Difficult to detect due to small size, coloration matching spring grass, and tendency to remain concealed. Active forager during wet season months.

Human Relevance

Subject to federal protection as a threatened since 1980. for vernal pool preservation in California. loss from agricultural development, urbanization, and grazing represents primary threat. Garden lippia ( nodiflora) poses additional risk by forming dense mats that impede foraging.

Similar Taxa

Elaphrus californicus and other congenersDistinguished by reduced circular pits on ; other Elaphrus typically possess more prominent elytral punctation
Cicindelinae (tiger beetles)Superficially similar in appearance and preference, but have larger , longer legs, and more active predatory ; Elaphrus has reduced eyes and shorter legs adapted for ground-dwelling in dense vegetation

More Details

Conservation Status

IUCN Critically Endangered; federally listed as threatened in the United States since 1980. The ' survival is directly tied to preservation of vernal pool , which have experienced significant losses in California due to agricultural conversion and urban development.

Etymology

Specific epithet 'viridis' derives from Latin for green, referencing the characteristic metallic green coloration of .