Chalcosyrphus libo

(Walker, 1849)

Long-haired Leafwalker

Chalcosyrphus libo is an uncommon of known by the Long-haired Leafwalker. It is characterized by an all-black body without the steel highlights seen in related species or the red abdominal markings present in . The species exhibits notably enlarged and ventrally spinose metafemora with correspondingly curved , features whose function remains unclear but may relate to substrate interaction on woody surfaces. are associated with dead and decaying wood, where females oviposit and develop as . The species has been observed in north-central North America.

Chalcosyrphus libo by (c) christine123, some rights reserved (CC BY), uploaded by christine123. Used under a CC-BY license.

Chalcosyrphus libo by Natthager. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Chalcosyrphus libo: /ˌkælkoʊˈsɜrfəs ˈlaɪboʊ/

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Identification

Chalcosyrphus libo can be distinguished from by its uniformly black coloration lacking steel highlights (present in C. chalybeus) and absence of red abdominal markings (present in C. piger). The possesses distinctly enlarged metafemora with and curved , features visible in view. Males exhibit (contiguous) . The overall body form is relatively large and compared to many , with a hulking appearance suggestive of dead wood association.

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Habitat

Associated with dead and decaying wood, particularly recently fallen or wind-thrown hardwood trees. have been observed repeatedly returning to and landing on dead tree trunks. The requires woody substrates for larval development.

Distribution

North-central North America, including Canada and the United States. Specific records include Vermont. The is described as uncommon throughout its range.

Diet

feed on pollen. are , developing in decaying wood and possibly feeding on fermenting sap.

Life Cycle

Females oviposit on or near dead wood. develop within decaying wood as rather than . likely occurs within the wood substrate. emerge and are active during warmer months.

Behavior

exhibit strong fidelity to dead wood substrates, repeatedly returning to dead tree trunks when disturbed. The enlarged hind legs may facilitate movement on bark or woody surfaces, though this function remains unconfirmed. Males possess contiguous . The does not typically visit flowers for nectar, instead obtaining pollen from leaf surfaces.

Ecological Role

contribute to wood decomposition as in dead and decaying hardwood. may serve as through pollen consumption, though their flower-visiting appears limited compared to other .

Similar Taxa

Chalcosyrphus chalybeusSimilar all-black coloration but distinguished by steel highlights not present in C. libo
Chalcosyrphus pigerSimilar body form and black coloration but possesses red abdominal markings absent in C. libo
Xylota spp.Related with similar dead wood association and ; distinguished by subtle differences in body proportions and leg