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Ovipositor of long-horned grasshopper (the two cerci are also visible) The ovipositor is a tube-like organ used by some animals, especially insects, for the laying of eggs. In insects, an ovipositor consists of a maximum of three pairs of appendages.
The terminalia of adult female insects include internal structures for receiving the male copulatory organ and his spermatozoa, and external structures used for oviposition (egg-laying). Most female insects have an egg-laying tube, or ovipositor; it is absent in termites, parasitic lice, many Plecoptera, and most Ephemeroptera.
The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. [1] Oviparity occurs in all birds, most reptiles, some fishes, and most arthropods. Among mammals, monotremes (four species of echidna, and the platypus) are uniquely oviparous.
Sawfly laying eggs in a plant, using the serrated saw-like ovipositor for which the group is named. The suborder name "Symphyta" derives from the Greek word symphyton, meaning 'grown together', referring to the group's distinctive lack of a wasp waist between prostomium and peristomium. [4]
Some species preferentially lay female eggs in larger hosts and male eggs in smaller hosts, as the reproductive capabilities of males are limited less severely by smaller adult body size. [9] Hornworm with parasitic wasp cocoons. Some parasitoid wasps mark the host with chemical signals to show that an egg has been laid there.
Other functions include lubricating the valves of the ovipositor during egg-laying, serving as a component of material used to build the nest, serving as a food for the developing larvae and being mixed with pollen and nectar to provision the brood cell before egg-laying.
As with all Obrimini, the eggs, which are 4.5 to 4.6 millimetres (0.18 to 0.18 in) mm long, 2.2 to 2.3 millimetres (0.087 to 0.091 in) mm wide and 2.5 to 2.6 millimetres (0.098 to 0.102 in) high, are laid in the ground using the laying spine at the end of the abdomen (ovipositor) deposited at a depth of only 1 to 2 centimetres (0.39 to 0.79 in).
Prionus laticollis with ovipositor extended laying eggs. The species is distinct among the eastern American species of Prionus for its rugose-punctate elytral texture and antennae with 12 antennomeres. Other species have 12 antennomeres, but have simple punctate elytra (such as P. pocularis) or have more than 12 antennomeres (such as P ...