2.3.1 Gut morphology
It was decided that the hindgut paunch as well as the colon (P4 region) within the intestinal tract of M. viator would be sampled (labelled below in Fig. 2.3), based on previous evidence from the literature that suggested that these sites would be most likely to contain actinomycete populations. An initial review of the papers describing the gut morphology in lower termites suggested that the hindgut consisted of a single dilated hindgut region – the paunch. However, a much more detailed comparison of lower termite guts (Noirot, 1995) showed that the situation is more complex. This in-depth description of the histology and morphology found in these termites indicated that the paunch region (especially in the Hodotermitidae family) is divided into two distinct parts – the anterior paunch region (commonly designated P3a), which is thin-walled; and the posterior paunch region (P3b) which is thick-walled due to a stronger muscle sheath. The two regions, especially in representatives of H. mossambicus and M. viator are separated by a distinct narrowing of the gut. In the initial dissections, what was initially discarded as being an inflated midgut was actually the P3a region, and in fact only the posterior region (P3b) of the paunch was investigated during this project. In order to allow for accurate scientific comparisons, all subsequent investigations only involved this particular section of the paunch. As a result, all further references to the paunch region are in fact referring to the posterior paunch or P3b. The whole gut examinations shown here were made using a Wild M7A (Heerbrugg, Switzerland) dissecting microscope.
Figure
2.3.1 ไส้สัณฐานวิทยาIt was decided that the hindgut paunch as well as the colon (P4 region) within the intestinal tract of M. viator would be sampled (labelled below in Fig. 2.3), based on previous evidence from the literature that suggested that these sites would be most likely to contain actinomycete populations. An initial review of the papers describing the gut morphology in lower termites suggested that the hindgut consisted of a single dilated hindgut region – the paunch. However, a much more detailed comparison of lower termite guts (Noirot, 1995) showed that the situation is more complex. This in-depth description of the histology and morphology found in these termites indicated that the paunch region (especially in the Hodotermitidae family) is divided into two distinct parts – the anterior paunch region (commonly designated P3a), which is thin-walled; and the posterior paunch region (P3b) which is thick-walled due to a stronger muscle sheath. The two regions, especially in representatives of H. mossambicus and M. viator are separated by a distinct narrowing of the gut. In the initial dissections, what was initially discarded as being an inflated midgut was actually the P3a region, and in fact only the posterior region (P3b) of the paunch was investigated during this project. In order to allow for accurate scientific comparisons, all subsequent investigations only involved this particular section of the paunch. As a result, all further references to the paunch region are in fact referring to the posterior paunch or P3b. The whole gut examinations shown here were made using a Wild M7A (Heerbrugg, Switzerland) dissecting microscope.Figure
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