Montana Field Guide

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- Kingdom - Animals - Animalia
  - Phylum - Spiders, Insects, and Crustaceans - Arthropoda
    - Class - Insects - Insecta
      - Order - Mayflies - Ephemeroptera
        
        Family - Baetid Mayflies - Baetidae
        
        Species - A Mayfly - Callibaetis fluctuans

A Mayfly - Callibaetis fluctuans

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Native Species

Global Rank: G5
State Rank: SNR

Agency Status
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General Description

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Diagnostic Characteristics

Callibaetis fluctuans and Callibaetis pictus can often co-occur. Larvae of C. fluctuans can be differentiated from those of C. pallidus, C. pictus, and C. ferrugineus by having the ventral lamellae of gills 3-6 narrowly joined to the dorsal lamella. Larvae of C. pictus are differentiated from those of C. ferrugineus and C. pallidus by the absence of robust setae on the tibiae and tarsi.

Observations in Montana Natural Heritage Program Database

Number of Observations: 36

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Relative Density

Recency

(Observations spanning multiple months or years are excluded from time charts)

Habitat

Callibaetis is common in lakes, permanent ponds, and slow-flowing portions of streams throughout North America.

Reproductive Characteristics

Adults were collected between May and September and it is likely that more
than one generation occurs per year.

References

Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Hendricks, P., S. Lenard, D.M. Stagliano, and B.A. Maxell. 2013. Baseline nongame wildlife surveys on the Fort Peck Indian Reservation. Report to the Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation. Montana Natural Heritage Program, Helena, MT. 83 p.
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Citation for data on this website:
A Mayfly — Callibaetis fluctuans. Montana Field Guide. Montana Natural Heritage Program. Retrieved on April 25, 2024, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=IIEPH62040