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Siphlonurus lacustris

Siphlonurus lacustris

A species of Siphlonurus

Siphlonurus lacustris is a species of mayfly belonging to the family Siphlonuridae. This species is present in most of Europe. The adults of these aquatic insects reach 10–15 millimetres (0.39–0.59 in) of length and can mostly be encountered from early May through August, mainly in oxygenated waterways and in fresh water of lakes (hence the Latin name lacustris, meaning "lacustrine"). The basic coloration of the body is brown or gray-brown. On the head they have large compound eyes and three ocelli. The wings are held upright, they are triangular and translucent, with well drawn dark veins. The hindwings are much smaller than the forewings. The legs are long and thin. At the tip of the cylindrical abdomen they have two long cerci (about 20–25 millimetres (0.79–0.98 in) long). Adults do not feed at all, as the reproduction is their main function. Their lifespan is very short, in the females lasts about 45 days, while in males usually no more than one day. The female lay the eggs on the water surface and leave them sink to the bottom. Nymphs are approximately10–12 millimetres (0.39–0.47 in) long. They live for about two years under rocks or buried in the mud, eating small invertebrates or small vegetables particles.

General Info About Siphlonurus lacustris
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Attributes of Siphlonurus lacustris
Colors
Brown
Black
Yellow
Habitat
Oxygenated waterway; fresh water of lake
Adult Food Sources
None (Adults do not feed and rely on energy stored from the younger stage)
Larva Food Source
Algae, plant matter, diatoms, detritus, organic particles
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
Not reported
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
Not reported
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Species Status of Siphlonurus lacustris
Stable population
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Distribution Area of Siphlonurus lacustris
Europe
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Life Cycle of Siphlonurus lacustris
Egg After being laid in water, the eggs of siphlonurus lacustris hatch into nymphs. The eggs are typically laid in clusters and are surrounded by a gelatinous substance, which offers protection until they are ready to hatch.
Naiad The naiads of siphlonurus lacustris resemble the adults but lack fully developed wings. Adapted to aquatic life, they undergo a series of molts, growing larger and developing wing pads. Their color and shape change gradually.
Subimago The siphlonurus lacustris transitions to a subimago or 'dun,' a unique, winged, but sexually immature stage. They exhibit adult-like features, such as wings for fleeting flights, yet possess a duller coloration and weaker flight compared to adults.
Adult Emerging from the subimago, the adult siphlonurus lacustris has a short lifespan. Adults are characterized by their transparent wings and reproductive capability. They engage in a breeding flight, after which they die shortly.
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Interesting Facts About Siphlonurus lacustris
Siphlonurus lacustris engage in synchronized mass emergences where millions can hatch simultaneously, creating a phenomenal natural display.
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Scientific Classification of Siphlonurus lacustris
Tips for Finding Siphlonurus lacustris
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Youth Habitat of Siphlonurus lacustris
Freshwater Habitats
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Adult Habitat of Siphlonurus lacustris
Forests and Woodlands, Freshwater Habitats, Edges of Lakes and Streams
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When is the Best Time to Observe Siphlonurus lacustris
The best time to find adult siphlonurus lacustris is during the evening or at night when they are most active and visible, whereas naiads can be found throughout the day submerged in freshwater environments.
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What is the Best Weather to Observe Siphlonurus lacustris
Mild to warm weather with little to no wind is ideal for finding adult siphlonurus lacustris, as they are more likely to be actively flying and mating. For naiads, stable water conditions without strong currents or sediment disturbance are preferred.
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How and Where Can You Find Siphlonurus lacustris at Different Life Stages
Egg Eggs of siphlonurus lacustris are laid in water and can be found by gently collecting samples of aquatic plants and sediment from freshwater bodies, then examining them in a lab setting.
Naiad Naiad of siphlonurus lacustris are aquatic and found on the bottom of clean, well-oxygenated freshwater bodies. Look for them by carefully overturning rocks and debris in shallow streams or ponds.
Subimago Subimago, or 'dun,' stage of siphlonurus lacustris can be found along the banks or surfaces of water bodies, as they transition between aquatic to aerial environments. You might spot them resting on vegetation near the water's edge.
Adult Adult siphlonurus lacustris, or 'spinner,' stage is best found by looking around light sources near freshwater at dusk or at night, as they are attracted to light during mating flights.
Are Siphlonurus lacustris harmful?
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Beneficial Effects of Siphlonurus lacustris
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Bioindicators
Bioindicators
Stage
Naiads
As a sensitive species, the naiad stage of siphlonurus lacustris serves as a precise gauge for water quality in freshwater ecosystems. Detecting their presence allows for early identification of ecological changes, pinpointing pollution or imbalances. This makes siphlonurus lacustris a reliable tool for ecologists to assess and monitor aquatic health, with the advantage of rapid response to environmental shifts, but requires careful identification due to their varying sensitivity across life stages.
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