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Thomisus onustus is a crab spider species in the genus Thomisus belonging to the family Thomisidae.
Thomisus is a genus of crab spiders with almost 150 species described. The genus includes species that vary widely in their ecology, but the best known crab spiders are those species that people call the flower crab spiders, because they are ambush predators that feed on insects visiting flowers. The flower crab spiders are the species for which the popular name was coined, because of their crab-like motion and their way of holding their front legs in an attitude reminiscent of a crab spreading its claws as a threat.
The Thomisidae are a family of spiders, including about 175 genera and over 2,100 species. The common name crab spider is often linked to species in this family, but is also applied loosely to many other families of spiders. Many members of this family are also known as flower spiders or flower crab spiders.
This species shows sexual dimorphism both in size and coloration. The adult males reach a body length of only 2–4 millimetres (0.079–0.157 in), while females are 6–7 millimetres (0.24–0.28 in) long. In males, the basic colour of the prosoma varies from yellow brown to dark brown, the opisthosoma may be yellow and green or brown. Females are very variable in colour, their basic colour can be white, yellow pale brown or pink, sometimes with additional shades of red. This species is characterized by the prominent rear corners of the opisthosoma.
The opisthosoma is the posterior part of the body in some arthropods, behind the prosoma (cephalothorax). It is a distinctive feature of the subphylum Chelicerata. Although it is similar in most respects to an abdomen, the opisthosoma is differentiated by its inclusion of the respiratory organs and the heart.
Like other species of the family Thomisidae these crab spiders do not make a web, but wait in ambush for their prey on flowers. The spiders are disguised by assuming the same colour as the flower, fooling both insect and bird predators. The prey consists of flower-visiting insects of all species, such as hover flies, bees, wasps, butterflies or beetles, which are often several times larger than the spider. They take their prey with two powerful and highly enlarged front leg pairs and usually kill them by biting on the back of their neck. Emerging spiderlings of Thomisus onustus may feed on pollen or nectar when insect prey is lacking.
Mating takes place mainly in June. The male climbs onto the back of the female to copulate. Finally, the male leaves the female. The female during the entire mating is completely passive and does not show any aggressive behaviour.
It has a Palearctic distribution, being found from Great Britain and Portugal in the west to Japan in the east. [ citation needed ] Its north–south distribution extends from Sweden to South Africa and from Siberia to Central Java, including temperate and tropical ecozones.[ citation needed ] These spiders prefer warm temperatures, forest-free areas, dry and sandy habitats with high solar radiation and dry grasslands.[ citation needed ]It is present in most countries of Europe, but is absent in Iceland, Ireland, Norway, Denmark and Finland, and it has also been seen in Iraq.
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, Asia to the east, and the Mediterranean Sea to the south. It comprises the westernmost part of Eurasia.
The giant house spider, now with the scientific name Eratigena atrica, is one of the biggest spiders of Central and Northern Europe. It was previously placed in the genus Tegenaria, where in addition to Tegenaria atrica, it was also documented as Tegenaria duellica, Tegenaria gigantea and Tegenaria saeva, among others, all thought to be different species. It is now a member of the newly described genus Eratigena. The bite of this species does not pose a threat to humans or pets, and the spider is generally reluctant to bite, preferring instead to hide or escape.
Nephila is a genus of araneomorph spiders noted for the impressive webs they weave. Nephila consists of numerous species found in warmer regions around the world. They are commonly called golden silk orb-weavers, golden orb-weavers, giant wood spiders, or banana spiders.
Xysticus is a genus of ground crab spiders described by C. L. Koch in 1835, belonging to the order Araneae, family Thomisidae. The genus name is derived from the Ancient Greek root xyst, meaning "scraped, scraper".
Misumena vatia is a species of crab spider with holarctic distribution. In North America, where it is the largest and best-known flower spider, it is called the goldenrod crab spider or flower (crab) spider, because it is commonly found hunting in goldenrod sprays in the autumn. Young males in the early summer may be quite small and easily overlooked, but females can grow up to 10 mm (0.39 in) ; males reach 5 mm (0.20 in) at most.
Araniella cucurbitina, sometimes called the "cucumber green spider", is a spider of the family Araneidae.
Nephilengys malabarensis is a araneid spider.
Gasteracantha cancriformis is a species of orb-weaver spider. It is widely distributed in the New World.
Platythomisus is a genus of flattened crab spiders from Africa and Southern Asia.
The Asian hornet, also known as the yellow-legged hornet, is a species of hornet indigenous to Southeast Asia. It is of concern as an invasive species in some other countries.
Sidymella rubrosignata is a species of crab spiders found in Australia. It is a common spider, often seen on Dianella plants.
Misumenoides formosipes is a species of crab spiders found in the US and Canada. The species' unofficial common name is white banded crab spider, which refers to a white line that runs through the plane of their eyes.
Arkys lancearius, the triangular spider, is a common Australian spider belonging to the family Arkyidae. It is an ambush hunter, commonly found resting on leaves and ferns or hanging from just a few threads of silk. The front two pairs of legs are large, suited for grabbing small insects, while the rear pairs of legs are much smaller.
Gibbaranea bituberculata is a species of 'orbweavers' belonging to the family Araneidae, subfamily Araneinae.
Synema globosum is a species of spiders belonging to the family Thomisidae. It is sometimes called the Napoleon spider, because of a supposed resemblance of the markings on the abdomen to a silhouette of Napoleon.
Ozyptila trux, the yellow leaflitter crab spider, is a crab spider species with Palearctic distribution.
The yellow crab spider,, is a species of spider of the genus Thomisus. It is found in Sri Lanka, Singapore, Sumatra, Nias Island, and Java. They often hide in flowers and are able to change colors just to blend in to capture preys.
Xysticus cristatus, the common crab spider, is a European spider from the family Thomisidae.
Ebrechtella tricuspidata is a species of crab spiders belonging to the family Thomisidae.
In computing, a digital object identifier (DOI) is a persistent identifier or handle used to identify objects uniquely, standardized by the International Organization for Standardization (ISO). An implementation of the Handle System, DOIs are in wide use mainly to identify academic, professional, and government information, such as journal articles, research reports and data sets, and official publications though they also have been used to identify other types of information resources, such as commercial videos.
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