Top 20 Most Common Insects in Phnom Penh

Upperside of male and female is black. Forewings and hindwings with a discal broad transverse area from below vein 4 in forewing to vein 2 on hindwing, a moderately large spot in interspace 5, a minute preapical dot beyond in interspace 6 on forewing, and a subterminal row of spots with two or three spots beyond them on the tornal angle of the hindwing, pale yellow, sometimes with an ochraceous, sometimes with a greenish tinge. The discal area on the forewing nearly as broad in interspace 3 as on the dorsum, on the hindwing narrowing to an acute point on vein 2 at two-thirds of its length from base of wing. Tails touched with bluish grey. Underside with the discal transverse area and spot in interspace 5 as on the upperside; base and costal margin of the forewing to apex, and base and dorsal margin of the hindwing broadly lilacine brown, on forewing with two small black spots near base. Bordering the transverse discal area on the inner side, where it is margined with black lines, and above, is a broad chocolate carved band, continued more narrowly along the outer side of the discal area; beyond this on the forewing is a concave series of dusky black lunules, on the hindwing the band itself is traversed by a line of obscure pale lunules; finally on the hindwing there is a subterminal series of internally white-bordered black spots followed by an obscure ochraceous terminal line, and above the tornal angle a slender transverse black line from vein 1 to the dorsal margin. Wingspan 6 - 9 cm. Caterpillar is elongated, slug-shaped, dark green; head large, wide and surmounted by four divergent curved fleshy spinous processes; anal segment with two short naked terminal points; the segments with an oblique yellowish-white lateral stripe, most prominent on the 7th, 9th and 11th segments, and beneath these a lower series of small white spots. Pupa is thick, cylindrically oval; green streaked with white; dorsum and thorax convex; head broad, truncated, obtusely pointed in front.

Oxyopes macilentus, sometimes known as the lean lynx spider, is a species of lynx spiders from East Asia, South Asia, Southeast Asia, and northern Australia. They are active predators, hunting invertebrates (including other spiders) among vegetation. They are especially common in grassy areas and rice fields. Their bodies are characteristically long and thin, about four times as long as it is wide. Their body color ranges from pale white to yellow, orange, or green; with a pattern of black, orange, and white longitudinal lines. Females have a maximum body length of 10 mm (0.39 in), while males grow to 9 mm (0.35 in). The species was first described in 1878 by the German arachnologist Ludwig Carl Christian Koch. The specific name is from Latin macilentus ("lean" or "thin"), in reference to the spider's body. It is classified under the genus Oxyopes.

The giant Crab Spider is a large spider native to the tropics; the largest reported individual had a leg span of 30 cm. This cosmopolitan spider is highly valued in some areas, as it's able to catch cockroaches and other indoor pests. Reportedly, it hunts even scorpions and bats. This spider is venomous and sometimes bites humans, but it's considered harmless.

Jamides alecto is a butterfly from the Lycaenidae family. The scientific name of the species was first validly published in 1860 by Felder.

It is a big dragonfly with blue eyes, pale green thorax and dark brown abdomen with bright blue-green markings on the sides. It can reach a wingspan of about 11 cm and a body length of about 8 cm . Forewings are clear, the inner-half of the hindwings is brown, while the outer-half is clear. Segment 1 and sides of segment 2 of the abdomen are pale green. The dorsum of segment 2 is blue. Segment 3 is pale green on the sides with a triangular blue spot on the dorsum. Segments 4 to 7 are with a pair of baso-lateral, postjugal, and apical spots, all in bright orange. The number of spots are lesser in segment 8 to 10. Anal appendages are dark brown; the middle of the inner margins of the superiors have a projection like a straight edged shelf. Females is similar to the male; but the brown patch on the hind-wing may pale or absent. The blue on the dorsum of segment 2 will be broken up into four by a narrow brown mid-dorsal carina and a transverse line lying midway to form a cross like mark. Anal appendages are very broad and shaped like lance head.

Cosmodela duponti is a species of tiger beetle with wide distribution range in South and Southeast Asia. They are found mainly in forested habitats. The species is distinct in its large size with iridescent blue and purple body with four white spots. There are hairs below the head (genal region) and the lateral pronotal margins are smooth and unhaired. There is considerable geographic variation and the nominate subspecies is from Southeast Asia. Specimens from India may be assigned to C. duponti barmanica but there may be more than one subspecies in India. They are found mainly along forests and near water. There are several subspecies that are recognized. The species was named after Henry Dupont, a trader in specimens from whom the French entomologist Pierre François Marie Auguste Dejean had obtained a specimen noted as being collected from "Cochinchina" (Vietnam) in 1826.

Catochrysops panormus, the silver forget-me-not, is a small butterfly found from India to the Philippines and south to Australia that belongs to the lycaenids or blues family. The species was first described by Cajetan Felder in 1860.

Like all cleaner species, pacific cleaner shrimp (Lysmata amboinensis) derives at least some of its food intake by consuming parasites and dead particles on the skin of friendly fish. Due to its appealing variety of colors, it is one of the most common crustaceans in the pet trade.

Opadometa fastigata, the pear-shaped leucauge, is a species of spiders in the family Tetragnathidae (long-jawed orb weavers). It is found in India to Philippines and Sulawesi. Members of the species have silvery or golden spots on the abdomen. They are elongated spiders with long legs and chelicerae. They are orb web weavers, weaving small orb webs with an open hub and few, wide-set radii and spirals. The webs have no signal line and no retreat. The web is a large horizontally-placed orb structure with a diameter of more than a metre. The entire web is often suspended by several long strands of silk attached to branches and leaves nearby. This species is separated from other Leucauge spiders by its pear-shaped abdomen and its unique fourth leg. In addition to the two rows of curved hairs (characteristic of Leucauge), this leg also has a thick brush of spines which are not present in most other species of Leucauge.