Hydrophorus chrysologus
(Walker, 1849)
Hydrophorus chrysologus is a of long-legged fly in the Dolichopodidae, Hydrophorinae. It belongs to a specialized for life on water surfaces, where skate across puddles, intermittent streams, and lake margins using surface tension. Like other dolichopodids, it is predatory on small insects and other arthropods. The species was described by Walker in 1849.
Pronunciation
How to pronounce Hydrophorus chrysologus: /haɪˈdrɒfərəs krɪˈsɒloʊɡəs/
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Identification
Hydrophorus are distinguished from other Dolichopodidae by their association with water surfaces and relatively long legs adapted for skating . Within Hydrophorus, species identification typically requires examination of male genitalia. Males possess forward-protruding claspers and related structures at the abdominal tip, visible as curled appendages beneath the . The lacks the bright metallic green, , or bronze coloration common in many other dolichopodid genera such as Condylostylus.
Habitat
Aquatic and semi-aquatic environments including puddles, intermittent streams, lake shores, and margins. are found on the water surface film rather than in vegetation.
Diet
are predatory on small insects and other arthropods. They have been observed preying on mosquito larvae when the larvae ascend to the water surface for air. The (modified lower lip) is equipped with opposable lobes used to crush or tear prey.
Life Cycle
Larval stage is aquatic or semi-aquatic. Specific larval for this is not documented, though dolichopodid larvae are generally predatory.
Behavior
skate across water surfaces using surface tension, behaving similarly to water striders (Gerridae). They are highly active and rarely stationary, making observation and photography difficult. Males possess ornamented front with specialized used in to females.
Ecological Role
of small aquatic and semi-aquatic , including mosquito larvae. Contributes to regulation of prey in freshwater edge .
Human Relevance
Potential agent for mosquitoes through on larvae. No documented negative impacts.
Similar Taxa
- DolichopusAlso in Dolichopodidae and some occur on water surfaces, but Dolichopus species generally have shorter legs and are more commonly found in terrestrial on foliage.
- Gerridae (water striders)Convergent surface-skating on water, but true bugs with different body plan, front legs, and rather than the crushing of dolichopodids.
More Details
Taxonomic note
Hydrophorus chrysologus is one of approximately 1,300 of Dolichopodidae in North America north of Mexico, across nearly 60 . Species-level identification in this is notoriously difficult and typically requires dissection and examination of male genitalia.