| Hydrovatus lyratus | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Coleoptera |
| Family: | Dytiscidae |
| Genus: | Hydrovatus |
| Species: | H. lyratus |
| Binomial name | |
| Hydrovatus lyratus Sharp, 1882 | |
| Synonyms | |
| |
Hydrovatus lyratus, is a species of predaceous diving beetle widespread in South Asia, South East Asia and Australian region. [1] [2]
Four subspecies have been identified. [3]
Third instar has a fusiformate body with elongated frontoclypeus. Lateral notches are absent and gular sutures are fused. Siphon elongated, acute apically, with secondary spines. Head length is 1.03 to 1.29 mm. Cephalic capsule pear-shaped, and tapering posteriorly. Cephalic capsule is mainly creamy white to pale yellow i color dorsally, with a longitudinal brownish stripe laterally. Antenna with four-segments, and slightly shorter than head capsule. Mandibles are falciform, and narrow. Pronotum trapezoidal dorsally, and ovate laterally. Pronotum creamy white to pale yellow. Legs are with five segments and pale yellow to pale brown in color. Abdomen consists with eight segments. [6]
Adult beetle has longer smooth-edged metatibial spine. The second sternite of male has a sharp, backwardly projecting process. In female, disc of elytron has a distinct, longitudinal groove. [7] Protarsi and mesotarsi are similarly expanded. Ventrite 2 consists with a midline large spine. Elytron lacks a macula. [8]
The Dytiscidae – based on the Greek dytikos (δυτικός), "able to dive" – are the predaceous diving beetles, a family of water beetles. They occur in virtually any freshwater habitat around the world, but a few species live among leaf litter. The adults of most are between 1 and 2.5 cm (0.4–1.0 in) long, though much variation is seen between species. The European Dytiscus latissimus and Brazilian Megadytes ducalis are the largest, reaching up to 4.5 cm (1.8 in) and 4.75 cm (1.9 in) respectively. In contrast, the smallest is likely the Australian Limbodessus atypicali of subterranean waters, which only is about 0.9 mm (0.035 in) long. Most are dark brown, blackish, or dark olive in color with golden highlights in some subfamilies. The larvae are commonly known as water tigers due to their voracious appetite. They have short, but sharp mandibles and immediately upon biting, they deliver digestive enzymes into prey to suck their liquefied remains. The family includes more than 4,000 described species in numerous genera.
Hyphydrus is a genus of diving beetle native to the Palearctic, the Afro-tropical region, the Near East, North Africa. It contains the following species:
Agnoshydrus is a genus of beetles in the family Dytiscidae, containing the following eight species:
Copelatus taprobanicus is a species of diving beetle endemic to Sri Lanka. It is part of the genus Copelatus in the subfamily Copelatinae of the family Dytiscidae. It was described by Wewalka & Vazirani in 1985.
Neptosternus sinharajaicus is a species of beetle. Its holotype was found in Sri Lanka. The species is capable of flight, as all specimens were captured flying towards light in the evening.
Neptosternus ceylonicus is a species of beetle. Its holotype was found in Sri Lanka. The specimens were captured in running water or when flying towards light in the evening.
Neptosternus arnecornelii is a species of beetle, named after Arne Cornelius. Its holotype was found in West Kalimantan, Indonesia. The specimens were captured floating on tree roots in a rocky mountain stream near a forest. Neptosternus arnecornelii superficially resembles N. biltoni from the Togian Islands northeast of Sulawesi. It is a small, broadly ovate species; with its body strongly flattened laterally.
Bidessini is a tribe of predaceous diving beetles in the family Dytiscidae. There are at least 40 genera and at least 630 described species in Bidessini.
Hyphydrini is a tribe of predaceous diving beetles in the family Dytiscidae. There are about 16 genera and more than 390 described species in Hyphydrini.
Hydaticus vittatus, is a species of predaceous diving beetle found in India, Pakistan, Sri Lanka, Nepal, Bangladesh, Bhutan, Myanmar, China, Japan, Taiwan, Thailand, Cambodia, Laos, Vietnam, Malaysia and Indonesia.
Neptosternus starmuehlneri, is a species of predaceous diving beetle found in Sri Lanka.
Neptosternus taprobanicus, is a species of predaceous diving beetle found in Sri Lanka.
Herophydrus musicus, is a species of predaceous diving beetle found in Asia and Europe.
Laccophilus inefficiens, is a species of predaceous diving beetle found in India, Bangladesh, Bhutan, Myanmar, Nepal, Pakistan, Sri Lanka, China, Hong Kong, Japan, Taiwan, Vietnam, Laos, Thailand, Indonesia, Iran and Malaysia.
Hydaticus fabricii, is a species of predaceous diving beetle found in India, Afghanistan, Myanmar, Nepal, Pakistan, Sri Lanka, China, Indonesia, Iran, Japan, Philippines, Taiwan, Thailand, Vietnam and Australia.
Hydaticus pacificus, is a species of predaceous diving beetle found in South and South East Asia.
Hydrovatus picipennis, is a species of predaceous diving beetle found in India, Sri Lanka, Indonesia, Philippines, China and Thailand.
Laccophilus ellipticus, is a species of predaceous diving beetle widespread in India, Myanmar, Sri Lanka, China, Cambodia, Indonesia, Thailand, and Vietnam.
Microdytes maculatus, is a species of predaceous diving beetle found in India, Thailand, Southern Andaman Islands, Sri Lanka, China, Thailand, Laos and Myanmar.
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