Siphlonurus typicus

(Eaton, 1885)

primitive minnow mayfly

Siphlonurus typicus is a of primitive minnow mayfly in the Siphlonuridae. It inhabits temporary ponds in eastern North America, where nymphs develop from March through June and emerge from late May to mid-June. Development is strongly temperature-dependent, with degree days serving as an excellent predictor of maturity.

Pronunciation

How to pronounce Siphlonurus typicus: /ˌsɪfloʊˈnjuːrəs ˈtɪpɪkəs/

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Identification

Distinguished from other Siphlonurus by specific morphological characters of the primitive minnow mayfly group; exact diagnostic features not detailed in available sources.

Habitat

Temporary ponds in forested and meadow settings. Documented occur in eastern Connecticut, specifically at the University of Connecticut Forest pond and Merrow Meadows pond.

Distribution

North America; specifically documented in eastern Connecticut with confirmed at two temporary pond sites. GBIF records indicate presence in the Nearctic region.

Seasonality

Nymphs active from March to June; and mating occur from 27 May to 21 June.

Life Cycle

Nymphal development spans March to June, tracked through 11 maturity classes based on capsule width measurements. Earlier-hatched nymphs achieve larger head capsule widths than later-hatched individuals. and mating occur from late May to mid-June. Oviposition occurs directly on pond surfaces, inlets, and outlets.

Behavior

Oviposition at multiple locations (ponds, inlets, outlets) indicates result from both local migrants and permanent residents. Development rate varies by location; the University of Connecticut Forest population matured faster but produced smaller individuals than the Merrow Meadows population.

Human Relevance

May be of interest to fly fishermen as a representative of primitive minnow mayflies, though specific angling significance not documented in available sources.

Similar Taxa

Other Siphlonurus speciesShare characteristics as primitive minnow mayflies; specific distinguishing characters not detailed in available sources

More Details

Development methodology

Researchers developed a new application using 11 maturity classes and capsule width measurements to track nymphal development and growth, with degree days serving as an excellent predictor of maturity (r²=0.963).

Population variation

Study documented intraspecific variation between two Connecticut : UCF pond population matured faster but was smaller than MER pond population. Sex ratio was female-biased at UCF pond (1.35:1) but not significantly different at MER pond.