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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 ...
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 Tenebrionoidea show a range of different morphologies. However, one characteristic of most adults is having 5 tarsomeres on the fore- and midlegs, and 4 tarsomeres on the hindleg (tarsal formula 5-5-4). Occasionally, males have tarsal formula reduced to 4-4-4, 3-3-3 or 3-4-4. [2]
Adult Trictenotomidae can be mistaken for Cerambycidae (Prioninae) or Lucanidae but their 5-5-4 tarsal formula makes them distinctive. They have a long 11-segmented antenna. They have a long 11-segmented antenna.
The tarsal formula is 5-5-5. They have unique elongated processes at the anterior margin of the labrum. They are found in decaying trees and fungus-infested logs. [4]
Adult Coccinelloidea have a reduced tarsal formula (each tarsus with 4 or 3 segments), hind coxae separated by more than 1/3 their width, the intercoxal process of abdominal ventrite 1 usually broadly rounded or truncate, hindwings with reduced anal veins and lacking a closed radial cell, the adeagus resting on its side when retracted and the phallobase usually reduced.
The tarsal formula is 4-4-4 (appearing as 3-3-3). They are found in leaf litter, near lake shores and marshy areas, in mammal and bird nests, probably as saprophages ...
Adults of Lagriinae are mostly medium-sized (5-12 mm) and have the typical Tenebrionidae features of a 5-5-4 tarsal formula and the antennal bases being hidden by canthi. . The eyes are usually deeply emarginate and in many species partly surround the antennal bas