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The lenght and number of these Flagellomeres determine the lenght and size of the antennae which can vary between, but also within, different species of insects. The number and form uf these units is an important factor in determing species and sub-species.
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Antennae can also locate other group members if the insect lives in a group, like the ant. The common ancestor of all arthropods likely had one pair of uniramous (unbranched) antenna-like structures, followed by one or more pairs of biramous (having two major branches) leg-like structures, as seen in some modern crustaceans and fossil ...
A comparison of the side view of T. sessile (below) and a diagram of the a typical ant body (below) shows how T. sessile’s gaster sits atop its petiole. This leads to a very small petiole and to the gaster being pointed downward. The anal pore then opens ventrally (toward the abdomen) instead of distally. [8] Their antennae have 12 segments. [6]
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Adult houseflies are usually 6 to 7 mm (1 ⁄ 4 to 9 ⁄ 32 in) long with a wingspan of 13 to 15 mm (1 ⁄ 2 to 19 ⁄ 32 in). The females tend to be larger winged than males, while males have relatively longer legs. Females tend to vary more in size [2] and there is geographic variation with larger individuals in higher latitudes. [3]
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The longhorn beetles (Cerambycidae), also known as long-horned or longicorns (whose larvae are often referred to as roundheaded borers), are a large family of beetles, with over 35,000 species described. [2] Most species are characterized by antennae as long as or longer than the beetle's body.