. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Vol. 106, No. 1 February, 1954. THE BIOLOGICAL BULLETIN PUBLISHED BY THE MARINE BIOLOGICAL LABORATORY THE INTERCEREBRALIS-CARDIACUM-ALLATUM SYSTEM OF SOME PLECOPTERA ] L. ARVY AND M. GABE Laborattiirc d'Anatomic ct Histoloyic contparccs, Sorhoinic, Paris, hrancc In spite of the interesting taxonomic position of the Plecoptera and the biological peculiarities of these insects their endocrine glands have been studied only by a small number of investigators. The existence of corpora allata in Pcrla Scop, was first r
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Vol. 106, No. 1 February, 1954. THE BIOLOGICAL BULLETIN PUBLISHED BY THE MARINE BIOLOGICAL LABORATORY THE INTERCEREBRALIS-CARDIACUM-ALLATUM SYSTEM OF SOME PLECOPTERA ] L. ARVY AND M. GABE Laborattiirc d'Anatomic ct Histoloyic contparccs, Sorhoinic, Paris, hrancc In spite of the interesting taxonomic position of the Plecoptera and the biological peculiarities of these insects their endocrine glands have been studied only by a small number of investigators. The existence of corpora allata in Pcrla Scop, was first reported by Nabert (1913). In Xcinnm rallicitlaria. \Yu (1923) described "lateral ganglia" which perhaps correspond to the corpora cardiaca. Hanstrom (1940) gave the first exact description of the endocrine glands in four species of Plecoptera (Nemura varieyata Oliv., Chloroperla 1'ircns bunncistcri Pictet, and Pcrla ccphalotcs Curt.). He showed that the anatomy of the endocrine glands of Nemura differs greatly from that of the three other species. In Nemura the medially located corpora cardiaca are fused with an unpaired lateral corpus allatum. while the three other species possess symmetrical paired corpora allata which are connected with the corpora cardiaca by anatomically defined nervi corporis allati. Histologically, according to Hanstrom, the corpora carcliac-i of the Plecoptera contain cells whose general appearance is that of neurons but whose glandular function seems probable on account of the presence of fuchsinophilic secretory granules. Likewise, the glandular function of the corpora allata is in- dicated by the occurrence of acidophilic secretory granules. Regarding the in- nervation of these endocrine glands, Hanstrom found, in the four species of Plecoptera studied, the two pairs of protocerebral nerves whose existence he had demonstrated in other Pterygota, and indicated that their cells of origin have the same location as in other in
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