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Lesser diving-beetle

Lesser diving-beetle

Acilius sulcatus

A species of Acilius

Acilius sulcatus is a species of water beetle in family Dytiscidae.It is fairly large (14.4 – 18.2 mm), with color variation shown throughout its range. Typically it is yellow and black.

General Info About Lesser diving-beetle
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Attributes of Lesser diving-beetle
Habitat
Temporary and permanent water bodies. A.sulcatas shows a generalist response to habitat choice living in bogs, ponds, streams, etc. As A. sulcatus is able to fly it is not restricted to a single body of water. A. sulcatus is found in water bodies with high and low levels of vegetation showing no preference between the two. They dominate in water bodies without any fish predators and are used as a primary indicator of predator presence.
Adult Food Sources
Small fish, aquatic insects, tadpoles, snails, frogs
Larva Food Source
Tadpoles, aquatic insects, small fish, insect larvae, worms
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
Predatory
Not reported
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Species Status of Lesser diving-beetle
Widespread and fairly frequent
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Distribution Area of Lesser diving-beetle
North Western Europe
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Life Cycle of Lesser diving-beetle
Egg The initial form of lesser diving-beetle is the egg, which is typically laid in water or in a moist environment. During this stage, the embryo develops inside a protective casing. The egg's size is very small, and its color often blends with the surroundings for camouflage.
Larva Upon hatching, the larva of lesser diving-beetle is primarily a feeding stage, with a wormlike body, chewing mouthparts for consumption of prey or plant matter, and lacking wings. It grows rapidly, shedding its exoskeleton multiple times as it increases in size.
Pupal The transitional pupal stage of lesser diving-beetle occurs in a quiescent state where transformation happens. The pupa is immobile and can vary in coloration. During this phase, the insect's tissues and organs are reorganized into the adult form.
Adult As an adult, lesser diving-beetle emerges with fully developed wings and functional reproductive organs. The body structure is hardened, providing more effective protection. Adults exhibit significant mobility and are focused on reproduction and, in some cases, dispersal.
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Predators of Lesser diving-beetle Larvae
Larval amphibians, fish, water beetles, backswimmers, dragonsfly nymphs
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Scientific Classification of Lesser diving-beetle
Tips for Finding Lesser diving-beetle
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Youth Habitat of Lesser diving-beetle
Freshwater Habitats
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Adult Habitat of Lesser diving-beetle
Freshwater Habitats
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How Can You Attract Lesser diving-beetle
For lesser diving-beetle, a suitable trap can be baited with meat or fish as they are carnivorous and attracted to potential prey.
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Habitat Preferences of Lesser diving-beetle Through Different Life Stages
The eggs of lesser diving-beetle are typically laid on submerged vegetation in freshwater bodies such as ponds and slow-moving streams. As larvae, they are aquatic predators often found among dense aquatic vegetation or under debris. Pupation occurs out of the water in moist soil near the water's edge, sheltered under stones or wood. Adults are strong fliers and can be found near or on the water surface of various freshwater habitats, where they predate on other aquatic organisms or search for mates. To locate the different stages, one would investigate the respective aquatic and nearby terrestrial habitats that cater to each life stage's ecological needs.
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How and Where Can You Find Lesser diving-beetle at Different Life Stages
Larva Lesser diving-beetle larvae are aquatic and predatory, usually found in freshwater environments like ponds or slow-moving streams. To find them, look in shallow water, under rocks, or vegetation and use a net to gently scoop in the water.
Pupal Lesser diving-beetle usually pupate in the water or on aquatic plants. Spotting the pupae requires careful observation of the submerged parts of plants or the bottom of the pond where they may be attached.
Adult Adult lesser diving-beetle are strong swimmers and fliers. At night, set up a light trap near the water's edge to attract them, or search around ponds, lakes, and streams with a flashlight. During the day, they may be found hiding under logs, stones, or debris near the water.
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Beneficial Effects of Lesser diving-beetle
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Predators of Pests
Predators of Pests
Purpose
Feed Itself
Lesser diving-beetle effectively capitalizes on aquatic environments to hunt. Employing strong mandibles, both larvae and adults grip and incapacitate various prey. Adults display remarkable diving ability, using their hind legs as oars. Not for social endeavors, their hunting is purely sustenance-driven. One surprising skill is their ability to eject water to propel backward, aiding in both predation and evasion.
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