TAILIEUCHUNG - Observations on the physiology of Lyssomanes viridis

I examined the structure of the cryofractured book lung of Phidippus audax with a scanning electron microscope. Each book lung is essentially a stack of flattened air-sacs, or lamellae, which project anteriorly into the lateral hemolymph space of the anterior opisthosoma. Each lamella is roughly triangular in shape. Hemolymph flows across each lamella from the medial to the lateral side (Fig. 1). Air enters the lamellae from the third, posterior side, after passing through a network of irregular cuticular struts (air filter) which lines the atrium of the book lung. The thin walls of each lamella are joined by. | Hill D. E. 2006 Observations on the physiology of Lyssomanes vlrldls RV1 GENERAL NOTE This republication is intended for free dissemination at no charge. Please attribute the source correctly. Please address all suggestions and corrections to the author. This version and republication copyrlght 2006 by David Edwin Hill. Some observations on the physiology of living Lyssomanes viridis which should apply to the Araneae in general Republication Version 1 September 18 2006 David E. Hill 213 Wild Horse Creek Drive Simpsonville South Carolina 29680 platycryptus@ Original pagination is retained for reference in this republication of the article originally published as Hill D. E. 1977 Some observations on the physiology of living Lyssomanes viridis which should apply to the Araneae in general. Peckhamia 1 3 41-44. Figure 2 has been replaced with an available color photograph of the same spider. A note has also been added at the end of this paper to illustrate several important features of book lung structure described in the text. 1. Original text with pagination 41 SOME OBSERVATIONS ON THE PHYSIOLOGY OF LIVING LYSSOMANES VIRIDIS WHICH SHOULD APPLY TO THE ARANEAE IN GENERAL. D. E. Hill Recently I examined the structure of the cryofractured book lung of Phidippus audax with a scanning electron microscope. Each book lung is essentially a stack of flattened air-sacs or lamellae which project anteriorly into the lateral hemolymph space of the anterior opisthosoma. Each lamella is roughly triangular in shape. Hemolymph flows across each lamella from the medial to the lateral side Fig. 1 . Air enters the lamellae from the third posterior side after passing through a network of irregular cuticular struts air filter which lines the atrium of the book lung. The thin walls of each lamella are joined by rigid struts near the medial side and the intra-lamellar air space cannot be expanded or compressed in this region. Toward the posterior and lateral sides however the two .

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