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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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Related references

de Marzo, L.; Vovlas, N., 1989: Strutture ed organi esoscheletrici in Batrisodes oculatus (Aube) (Coleoptera, Pselaphidae). Entomologica (Bari): 24: 113-125

de Marzo, L., 1986: Osservazioni etologiche sulle larve di Batrisodes oculatus Aube (Coleoptera, Pselaphidae). Frustula Entomologica. 1984-1985 ; 7-8: 501-506

de Marzo, L.; Vit, S., 1982: Note sulla presenza di Batrisodes oculatus Aube (Coleoptera, Pselaphidae) in una grotta di Puglia. Explorations of a large karstic cave in Apulia show an abundance of B. oculatus in the deeper parts of this cave. Many alive adults were collected and hundreds of dead specimens were observed, same of which scarcely sclerotized.

de Marzo, L., 1985: Organi erettili e ghiandole tegumentali specializzate nelle larve di Batrisodes oculatus Aube: studio morfo-isotologico (Coleoptera, Pselaphidae). 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...

Mendel H., 1991: Batrisodes adnexus hampe batrisodes buqueti auctt brit and batrisodes delaportei aube col pselaphidae in britain. Entomologist's Record & Journal of Variation 103(11-12): 293-296

D.M.rzo L.; Vit S., 1982: Notes on the presence of batrisodes oculatus coleoptera pselaphidae in a cave in apulia italy. Explorations of a large karstic cave in Apulia show an abundance of B. oculatus in the deeper parts of this cave. Many alive adults were collected and hundreds of dead specimens were observed, same of which scarcely sclerotized.

de Marzo, L.; Vit, S., 1983: Contributo alla conoscenza della Batrisinae paleartiche (Coleoptera, Pselaphidae). Le ghiandole antennali nei maschi di Batrisus Aube e Batrisodes Reitter: variazioni morfologiche, istologia e valore tassonomico. Structural modifications of the apical antennal segments of males are studied and described for 10 Palearctic Batrisinae Batrisodes delaportei, B. hubenthali, B. adnexus, B. venustus, B. ruprechti, B. oculatus, B. elysius, B. insularis, B. buqueti...

D.M.rzo L.; Vit S., 1983: Palearctic batrisinae coleoptera pselaphidae antennal male glands of batrisus and batrisodes morphology histology and taxonomic implications. Structural modifications of the apical antennal segments of males are studied and described for 10 Palearctic Batrisinae [Batrisodes delaportei, B. hubenthali, B. adnexus, B. venustus, B. ruprechti, B. oculatus, B. elysius, B. insularis, B. buquet...

Mendel, H., 1991: Batrisodes adnexus (Hampe) (B. buqueti Auctt. Brit.) and B. delaporti (Aube) (Col. Pselaphidae) in Britain. Entomologist's Record and Journal of Variation 103(11-12): 293-296

Besuchet, C., 1981: Contribution to the study of the Palearctic Batrisodes (Coleoptera: Pselaphidae). Revue suisse de zoologie8(1): 275-296