52. The Anatomy and Histology of the Alimentary Canal in the Common Wasp (Vespa vulgaris).
Article first published online: 21 AUG 2009
Proceedings of the Zoological Society of London
Volume 101, Issue 3, pages 1041–1066, September 1931
How to Cite
Green, T. L. (1931), 52. The Anatomy and Histology of the Alimentary Canal in the Common Wasp (Vespa vulgaris). Proceedings of the Zoological Society of London, 101: 1041–1066. doi: 10.1111/j.1096-3642.1931.tb01053.x
- Issue published online: 30 OCT 2009
- Article first published online: 21 AUG 2009
- Received March 31, 1931: Eead June 9, 1931.
- 1The mouth-parts of the wasp are designed for biting, licking, and mastication; they are well developed in all castes; their musculature is fully described and compared with larva, and also with the bee and Dytiseus.
- 2The pharynx is a large sac with complicated muscles designed for pumping and swallowing. The elasticity of chitin is used to antagonize certain muscles; it co-operates with others, and these show reduced size.
- 3Certain direct homologies of larval and adult muscles are defined, and the significance of this possibility discussed.
- 4The esophagus and crop are typical.
- 5The proventriculus is well developed and acts as a pump in conjunction with the pharynx.
- 6The ventriculus is typical and is built upon a definite, geometric pattern which conditions the features seen in sections cut in known planes. The replacement cells are few and lie within the basement-membrane; any idea that they exist external to this is due to confusing them with a layer of fine longitudinal muscle-fibres whose presence confirms White's record of a third layer of ventricular muscles.
- 7The peritrophic membrane arises by “delamination,” probably as the result of condensation of cell-secretions, and not from the striated border nor the esophageal valve. It may represent a partially chitinous intima of the mid-gut.
- 8The small intestine has two well-marked histological areas and a local anterior muscle concentration acting as a sphincter or as a means of hastening peristalsis.
- 9The Malpighian tubules show well-marked secretion phases.
- 10The rectum has a general syncytium, with characteristic rectal pads. The interpretation of these structures awaits the further study of their development.
- 11The intrinsic muscles of the gut are attached to the basement-membrane lying below the digestive epithelium.