. Nosema-disease. Bees. NOSEMA-DISBASE. a slender tube traversing the entire thorax. In the anterior part of the abdomen the oesophagus expands into a large thin-walled sac which is known as the honey stomach (HS); next is the short neck- lilce portion, the proventriculus (Pvent); then comes the large U- shaped portion, the stomach or ventriculus (Vent), an organ with thick waJls and many annular constrictions. FoUowing the stomach is the short, narrow and coiled, small in- testine (Slnt) having a circle of about one hundred long, greatly coiled, blind, thread- like tubes opening into its ante
. Nosema-disease. Bees. NOSEMA-DISBASE. a slender tube traversing the entire thorax. In the anterior part of the abdomen the oesophagus expands into a large thin-walled sac which is known as the honey stomach (HS); next is the short neck- lilce portion, the proventriculus (Pvent); then comes the large U- shaped portion, the stomach or ventriculus (Vent), an organ with thick waJls and many annular constrictions. FoUowing the stomach is the short, narrow and coiled, small in- testine (Slnt) having a circle of about one hundred long, greatly coiled, blind, thread- like tubes opening into its anterior end. These tubes are the Malpighian tubules (MaT). Following the small intestine is the large intestine or rec- tum (Reef). When bees have been con- fined for some time this latter portion of the canal is found dis- tended with material to be voided. Since the stomach is always invaded by the parasite in Nosema- disease, and the Mal- pighian tubules occa- sionally are, a further description of the structure of these or- gans seems warranted. The stomach (fig. 1 Vent) is a relatively ^<^- l.âAlimentary canal ot worker bee: Pharynx (PAy), oesophagus <-Vi â t- "" 11 rl (CB), honey st6niaoii (.HS), proventriculus (_Pvent), stomach or tniCK-Wailea organ veutriculus (Vent), small intestine (S/ni), and large intestine or lying U-shaped within rectum (.Itect), rectal glands (.RGl), Malpighian tubules (Mai) the abdomen. When removed and straight- ened it is seen to be in general cylindrical but somewhat spindle-shaped in form. (PI. I.) Circular constrictions present give to it a segmented appearance. The number and distinctness of these transverse mark- ings vary somewhat. The size of the organ and its color vary also. The color varies within wide limits, being usually some shadei of Vfent. Salivary glands of head (UGl) and thorax (SGI), and pharyngeal glands(iG!)arealsoshown. (Snodgrass.). Please note that these images are extracted from scanned page images that
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwa, booksubjectbees
