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A tarsal formula states the number of segments of an insect's tarsi as three numbers, a-b-c, starting with the fore leg (a), then the middle leg (b), then the hind leg (c). For example, a tarsal formula of "5-5-4" as found in the Trictenotomidae means there are five segments in the fore leg's tarsi, five segments in the middle leg's tarsi, and ...
Most modern insects have tarsi divided into subsegments (tarsomeres), usually about five. The actual number varies with the taxon, which may be useful for diagnostic purposes. For example, the Pterogeniidae characteristically have 5-segmented fore- and mid-tarsi, but 4-segmented hind tarsi, whereas the Cerylonidae have four tarsomeres on each ...
Their tarsal formula is 5–5–5, meaning that on each of the front, middle and hind legs there are 5 tarsomeres (individual subsegments of the feet/tarsi). [1] One or more of these subsegments on each leg is typically lobed, and the 4th tarsomere is normally difficult to distinguish.
Leaf beetles are partially recognizable by their tarsal formula, which appears to be 4-4-4, but is actually 5-5-5 as the fourth tarsal segment is very small and hidden by the third. [2] As with many taxa, no single character defines the Chrysomelidae; instead, the family is delineated by a set of characters. [3]
The sinus tarsi, also known as the talocalcaneal sulcus, [1] is a cylindrical canal in the hindfoot. It has a complex anatomy, with five ligamentous structures and a pad of adipose tissue (fat). [2] The tarsal canal opens up into the sinus tarsi, [3] however, the tarsal canal is a distinct structure.
The combination of their elongated tarsi and fused tibiofibulae makes them morphologically specialized for vertical clinging and leaping. [19] The head and body range from 10 to 15 cm in length, but the hind limbs are about twice this long (including the feet), and they also have a slender tail from 20 to 25 cm long.
The synovial membrane between the second and third cuneiforms behind, and the second and third metatarsal bones in front, is part of the great tarsal synovial membrane. Two prolongations are sent forward from it, one between the adjacent sides of the second and third, and another between those of the third and fourth metatarsal bones.
The antennal formula is used to describe the number of segments in each of the components of the antenna (scape; pedicel; anelli, funicle; clava). An antennal formula of 1:1:2:4:3 indicates an antenna with a scape, a pedicel, 2 anelli, 4 funicular segments, and 3 segments in the clava (or club).