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Exsertile organs and specialized integumental glands in larvae of batrisodes oculatus aube a morphohistological study coleoptera pselaphidae


, : Exsertile organs and specialized integumental glands in larvae of batrisodes oculatus aube a morphohistological study coleoptera pselaphidae. Entomologica (Bari) 20: 125-146

Data are presented on the following paired organs, the every larval instar of Batrisodes oculatus bears: Exsertile head organs-They appear to arise from the antennal articular membrane and are lined by simple, non-glandular, epithelium. Their apex shows a number of small branches, each of them ending with a spherical body. A system of retractor muscles arises from the head ventral part. Similar organs are present in other pselaphid larvae; possibly they collect secretion from the respective head gland, in order to facilitate catch of prey (Collembola). Exsertile abdominal organs (segments 5-8)-They are very small protuberances that replace the spiracles in their segments; thus they do not include tracheal branches. Their function is unknown: this may depend upon the mirmecophilous habit of B. oculatus. Head glands-They are single cells including a cuticular ductule, that opens at the base of the respective exsertile organ. Undoubtfully, their secretion reaches the apex of the latter and renders it sticky. Thoracic and abdominal glands (meso-, metathorax, abdominal segments 1-9)-They exhibit the same histological feature than those of head, but are very much larger. Undoubtfully, they are the source of the viscous secretion that the larvae use for both the catch of preys and building of their silky pupal cocoon. References are listed, which suggest what follows: 1) Within the Staphylinoidea, a further example of larval exsertile apparatus with associated glands is known in the staphylinid Oligota oviformis Casey. 2) Presence of integumental glands which recall those of B. oculatus occurs in a number of larval Staphylinoidea. 3)Presence of abdominal protuberances is common in mirmecophilous and termitophilous larvae of Lepidoptera, Coleoptera and Diptera.

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