Predaceous Diving Beetles belong in the order Coleoptera sheath-wingsa reference to the firm, front pair of wings—the elytra —that cover and protect the membranous second pair of [flying] wings. More than a quarter of all species of living things that have been described are beetles they have been around for million years, plus or minusand they outnumber vertebrates 18 to 1. There are 24, beetle species in North America alone.
They occur in virtually any freshwater habitat around the world, but a few species live among leaf litter. The European Dytiscus latissimus and Brazilian Megadytes ducalis are the largest, reaching up to 4. The larvae are commonly known as water tigers due to their voracious appetite.
Some species of Sternopriscus tolerate acidic water and other species tolerate slightly saline water. Instream habitat: At family level, dytiscid beetles live in a variety of lentic and some lotic freshwater habitats. They are most abundant in the littoral zone at the edge of ponds and lakes and are also found in water filled ditches, dams, billabongs, pools in intermittent streams and inland saline lakes.
Dytiscidae predaceous water beetles is one of the largest and most commonly encountered groups of aquatic beetles. Both adults and larvae are predaceous, and will attack a wide variety of small aquatic organisms. Although most species are small to medium sized, some adults can attain a length of 35 mm.
Watson and M. Beetles oval to elongate-oval; dorsally somewhat convex to dorsally strongly convex of similar convexity above and below ; not necked; somewhat waisted. Upper surfaces of body glabrous or subglabrous, or non-glabrous; not bristly; with neither scales nor scale-like setae.
New facts, new pictures. Beetles belong in the Order Coleoptera sheath-wingsa reference to the firm, front pair of wings — the elytra — that cover and protect the membranous second pair of flying wings. Beetles have been around for million years, plus or minus, and more than a quarter of all species of living things that have been described are beetles.
The larvae of both families are similar. They are worm-like, with hard heads and a pair of long, sharp pincers for jaws. Their jaws are specially designed to capture and eat aquatic animals.
New facts, new pictures. Beetles have been around for million years, plus or minus, and more than a quarter of all species of living things that have been described are beetles. They outnumber vertebrate species 18 to 1.
Great Diving Beetles Dytiscus spp. Adult Great Diving Beetle at the pond surface. Photographed from beneath the animal is reflected in the surface.
Please refer also to the following link for details on this group:. Larvae and adults are predaceous; all species are aquatic and excellent swimmers. Most species live on the immature stages of other aquatic insects, mainly Ephemerida, Hemiptera and Odonata. Larvae and adults have generally the same food source, though the latter, being more agile, receive a greater choice.