Ectemnius continuus
(Fabricius, 1804)
Common Ectemnius
Ectemnius continuus is a small to -sized digger in the Crabronidae, widespread throughout the Holarctic region. It is black with markings on the , , and tergites, and has a covered with silver hairs. The is notable for having 12 antennal in both sexes, unlike most where males typically have 13 segments. Males possess unique small on the first and second of the mid .
Pronunciation
How to pronounce Ectemnius continuus: /ɛkˈtɛmniəs kənˈtɪnjuəs/
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Identification
Distinguished from similar Ectemnius by the 12 antennal in both sexes (most males have 13). Male specimens can be identified by the small on the first and second of the mid . The combination of -marked black coloration with silver-haired helps separate it from related such as Anacrabro, Lestica, and Crabro; unlike Anacrabro, Ectemnius has a convex rather than concave underside of the .
Images
Appearance
Black body with markings on the (antennal bases), (thoracic behind ), (lower leg segments), and tergites (abdominal segments). (lower part of ) covered with dense, silver hairs. Both sexes possess 12 antennal segments. Males have distinctive small on the first and second of the mid . Size is small to for the .
Habitat
Woodlands, gardens, and farmland. Nests are constructed in cavities in dead wood, particularly old burrows in tree stumps and standing dead wood.
Distribution
Widespread throughout the Holarctic region. Found in Africa, Europe and Northern Asia (excluding China), North America, and Southern Asia. In the United , common particularly across the south.
Seasonality
period from early May to late September. Likely (two per year) in the southern UK; (single generation) elsewhere.
Diet
visit flowers of umbellifers for nectar. Females hunt -sized () including (), ( and relatives), and (). () and () have also been recorded as .
Life Cycle
to depending on latitude. Nests contain up to 10 , with each cell provisioned with 6-8 . Nest structure varies from straight to branching. One develops per cell, feeding on the stored .
Behavior
Females hunt to provision nest . are strongly associated with umbellifer flowers including angelica, hogweed, wild carrot, wild parsnip, fennel, cow parsley, and water-dropwort, visiting for both nectar and to hunt . Nest entrances are in pre-existing cavities in dead wood rather than excavated in soil.
Ecological Role
of -sized ; contributes to regulation of . of umbellifer flowers through nectar feeding.
Human Relevance
Potential agent for pest . Non-aggressive; does not defend nests aggressively. Presence in gardens and farmland indicates healthy dead wood .
Similar Taxa
- Anacrabro ocellatusSimilar black-and- coloration and size, but Anacrabro has a very concave underside of the (Ectemnius has convex), nests in soil rather than wood, and hunts rather than .
- Other Ectemnius speciesMost similar have males with 13 antennal ; E. continuus males have only 12 segments and distinctive on mid 1-2.
- Lestica and CrabroRelated in tribe Crabronini with similar general appearance; distinguished by specific combinations of facial , clypeal hair patterns, and male .
More Details
Genome sequencing
The of Ectemnius continuus has been sequenced and published (Wellcome Open Research, 2024; PMCID: PMC10964002), providing genetic resources for studying this widespread digger .
Subspecies
Four recognized: E. c. continuus (Fabricius, 1804), E. c. punctatus (Lepeletier de Saint Fargeau & Brullé, 1835), E. c. rufitarsis (Dalla Torre, 1897), and E. c. sulphureipes (F. Smith, 1856).