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Twin-lobed deerfly

Twin-lobed deerfly

Chrysops relictus

A species of Deer flies, Also known as Horse fly

The twin-lobed deerfly (Chrysops relictus) is distinctly based on the twin lobs on its body, creating a repeating V-shaped pattern that runs along the entirety of its abdomen. It is also a fly that is much more likely found to attack humans, as they feed on blood.

Bite Humans
Bite Humans
Cause Disease in Humans
Pathogenic
Does Twin-lobed deerfly consume human blood?
Hematophagy
Does the Twin-lobed deerfly cause allergies?
Allergenic
General Info About Twin-lobed deerfly
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Attributes of Twin-lobed deerfly
Colors
Brown
Black
Green
Habitat
moist area (meadow; wet ground); woodland
Adult Food Sources
Blood (females only), nectar, plant sap, honeydew, sugary secretions
Larva Food Source
Small insects, organic debris, small invertebrates, amphibian larvae, worms
Biting/stinging
The Twin-lobed deerfly may bite humans actively. Please stay away from it.
Allergy-causing
The Twin-lobed deerfly has special defensive behaviors that can trigger an allergic reaction. If there are serious reactions, seek IMMEDIATE medical attention.
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The Twin-lobed deerfly is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
Not reported
Predatory
Not reported
Biting animal or pet
Yes
Mouthparts Type
Cutting-sponging mouthparts
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Species Status of Twin-lobed deerfly
It is distributed in Europe.
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Distribution Area of Twin-lobed deerfly
European
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Appearance of Twin-lobed deerfly
The adult twin-lobed deerfly, Chrysops relictus, is a largish European fly of about 8 - 10 mm in length.
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How to Identify Twin-lobed deerfly?

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Life Cycle of Twin-lobed deerfly
Egg Eggs of the twin-lobed deerfly are typically laid in groups and possess a distinct shape with coloring that enables them to blend into their surroundings. These eggs are small and ovular, preparing to hatch into the larval stage.
Larva Upon hatching, the twin-lobed deerfly larvae exhibit worm-like bodies with a segmented appearance and a voracious appetite for growth. They lack wings and have a simple mouthpart for feeding, usually very different in color and shape from adults.
Pupal After extensive feeding, the larva transforms into a non-feeding pupa that may use a cocoon or a hardened exoskeleton for protection. During this stage, the twin-lobed deerfly undergoes significant internal changes as it transitions to an adult.
Adult Emerging from the pupa, the adult twin-lobed deerfly's development is marked by the presence of wings and functional reproductive organs. The body is fully formed and hardened, the adult is mobile, focusing on reproduction.
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Adult Size of Twin-lobed deerfly
8 - 10 mm
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Predators of Twin-lobed deerfly Larvae
Frogs, toads, beetles, spiders, bird chicks, ant larvae
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Predators of Adult Twin-lobed deerfly
Birds, dragonflies, robber flies, spiders, frogs, bats
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Interesting Facts About Twin-lobed deerfly
Twin-lobed deerfly possess a unique visual system that allows them to see ultraviolet light, aiding them in navigation and finding food sources.
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Scientific Classification of Twin-lobed deerfly
Class
Bugs
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Order
Flies
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Tips for Finding Twin-lobed deerfly
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Youth Habitat of Twin-lobed deerfly
Forests and Woodlands, Grasslands and Prairies, Freshwater Habitats
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Adult Habitat of Twin-lobed deerfly
Forests and Woodlands, Grasslands and Prairies
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Habitat Preferences of Twin-lobed deerfly Through Different Life Stages
The eggs of twin-lobed deerfly are typically found on vegetation near water sources like ponds or marshes. Larvae dwell in wet soil or mud, often at the water's edge, where they feed on organic matter and small invertebrates. Pupation occurs in drier locations, still close to the larval habitat but potentially in slightly elevated areas to avoid flooding. Adults are generally found in areas with ample vegetation, as they feed on nectar and can also be seen near hosts for blood meals. If searching for these stages, focus on riparian zones for eggs and larvae, examine nearby soil for pupae, and look in meadows or forest edges for adult twin-lobed deerfly.
Are Twin-lobed deerfly harmful?
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Harmful Effects of Twin-lobed deerfly
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Explore the dangers of insects related to toxicity, lethality, human biting, human stinging, pathogenicity, hematophagy, allergenicity, parasitism, etc.
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Icon toxic for
Bite Humans
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Pathogenic
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Hematophagy
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Bite Humans

Twin-lobed deerfly target humans primarily for blood meals, essential for their reproductive cycle. They use piercing mouthparts to penetrate the skin, resulting in painful bites that can lead to mild allergic reactions. Their biting behavior is more prevalent during daylight hours and warm seasons.

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Cause Disease in Humans

Twin-lobed deerfly, a biting fly, can transmit the Loa loa worm, causing loiasis in humans, with symptoms like skin swelling, itchy welts, and eye damage, potentially leading to severe kidney and heart complications. Risk varies by geographic exposure, particularly in central and West Africa.

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Does Twin-lobed deerfly consume human blood?

Twin-lobed deerfly, commonly known as deer flies, exhibit hematophagy by lacerating host skin and ingesting blood, often from mammals including humans. This can transmit diseases and cause allergic reactions. Females primarily engage in blood feeding for egg development, while males feed on nectar.

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