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Contribution a la Connaissance Anatomique des Plécoptères : la Région Céphalique de la Larve de Nemoura Cinerea [Nemouridae]

Contribution a la Connaissance Anatomique des Plécoptères : la Région Céphalique de la Larve de... Summary 1. Head capsule. The sutures are described; the cranial areas are defined and interpreted thanks to the muscular attachments they bear. In particular, it is shown that: — the « macules frontales » of Plecoptera represent the external trace of the attachment of the muscles suspending the dorsal arm of the tentorium; — the « M-shaped line » of Perlidae and Perlodidae corresponds to the contiguous frontal origins, right and left, of the retractors of the mouth angle, extrinsic muscles of the labrum and precerebral dorsal pharyngeal dilatators. A narrowing of the foremost frontal area is accompanied with an inner median frontal ridge. The prognathous condition results from a stretching of the hypostomium, but there is no « prepharynx », nor is the head capsule closed ventrally. 2. Tentorium. Its anterior and posterior arms are connected with inner ridges that accompany the head sutures. The corpotentorium is suspended by a supposed etrogressred muscle, known in Apterygota. 3. Antenna. Four extrinsic muscles move the scape in an approximatively horizontal plane, and four intrinsic muscles the pedicel and flagellum in a vertical plane. 4. Mandibule. It has been noticed to bear two tentorial adductors. 5. Maxilla. It belongs to the orthopteroid type; the author has shown the presence: — of groups of tentorio-cardinal, tentorio-stipital, and stipido-lacinial muscles, that usually correspond to a single muscle in Pterygota; — of a stipito-stipital muscle known only in Apterygota, so far. 6. Labium. It has been anatomically interpreted, and this interpretation may be used for all Plecoptera. It is stressed on the presence of a mentum. Two postmental muscles may exist in Pterygota, one going to the mentum, the other to the prementum; in the interpreting of tripartite labiums, one must have in mind that either of these muscles may disappear. In the nymph of Nemoura cinerea, both are noticed. It is the only case among Insects that has rigorously been demonstrated. 7. Cibarium and pharynx. They are described with their musculature. The morphological mouth is defined by the insertions of the frontal retractor of the mouth angle, of the clypeal dorsal, and tentorial lateral dilatators of the mouth, and by the position of the first semi-annular ventral muscle. The pharyngeal muscles are grouped in three paired series. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Contribution a la Connaissance Anatomique des Plécoptères : la Région Céphalique de la Larve de Nemoura Cinerea [Nemouridae]

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Publisher
Taylor & Francis
Copyright
© 1968 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1968.12278055
Publisher site
See Article on Publisher Site

Abstract

Summary 1. Head capsule. The sutures are described; the cranial areas are defined and interpreted thanks to the muscular attachments they bear. In particular, it is shown that: — the « macules frontales » of Plecoptera represent the external trace of the attachment of the muscles suspending the dorsal arm of the tentorium; — the « M-shaped line » of Perlidae and Perlodidae corresponds to the contiguous frontal origins, right and left, of the retractors of the mouth angle, extrinsic muscles of the labrum and precerebral dorsal pharyngeal dilatators. A narrowing of the foremost frontal area is accompanied with an inner median frontal ridge. The prognathous condition results from a stretching of the hypostomium, but there is no « prepharynx », nor is the head capsule closed ventrally. 2. Tentorium. Its anterior and posterior arms are connected with inner ridges that accompany the head sutures. The corpotentorium is suspended by a supposed etrogressred muscle, known in Apterygota. 3. Antenna. Four extrinsic muscles move the scape in an approximatively horizontal plane, and four intrinsic muscles the pedicel and flagellum in a vertical plane. 4. Mandibule. It has been noticed to bear two tentorial adductors. 5. Maxilla. It belongs to the orthopteroid type; the author has shown the presence: — of groups of tentorio-cardinal, tentorio-stipital, and stipido-lacinial muscles, that usually correspond to a single muscle in Pterygota; — of a stipito-stipital muscle known only in Apterygota, so far. 6. Labium. It has been anatomically interpreted, and this interpretation may be used for all Plecoptera. It is stressed on the presence of a mentum. Two postmental muscles may exist in Pterygota, one going to the mentum, the other to the prementum; in the interpreting of tripartite labiums, one must have in mind that either of these muscles may disappear. In the nymph of Nemoura cinerea, both are noticed. It is the only case among Insects that has rigorously been demonstrated. 7. Cibarium and pharynx. They are described with their musculature. The morphological mouth is defined by the insertions of the frontal retractor of the mouth angle, of the clypeal dorsal, and tentorial lateral dilatators of the mouth, and by the position of the first semi-annular ventral muscle. The pharyngeal muscles are grouped in three paired series.

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Jan 31, 1968

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