. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B RTF AT 2mm F6 iVTF. FIGURE 2. Sagittal view of left side of telson (t), segment 6 (s6), and medial edge of left uropod propodite (U) in A, Procambams and B, Pandalus to show the flexor tendon (ft) that in macrurans interconnects the axial muscles in the telson and s6. iVTF, insertion of VTF on F6 muscle; *, approximate location of the interconnection between the ft and the more lateral, perpendicularly oriented TU tendon (see Fig. 1 and text). muscle. The TU muscles are very small compared to the massive telson flexor musc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B RTF AT 2mm F6 iVTF. FIGURE 2. Sagittal view of left side of telson (t), segment 6 (s6), and medial edge of left uropod propodite (U) in A, Procambams and B, Pandalus to show the flexor tendon (ft) that in macrurans interconnects the axial muscles in the telson and s6. iVTF, insertion of VTF on F6 muscle; *, approximate location of the interconnection between the ft and the more lateral, perpendicularly oriented TU tendon (see Fig. 1 and text). muscle. The TU muscles are very small compared to the massive telson flexor muscles. Their actions would appear to be depression of the uropod (see also Larimer and Kennedy, 1969a). The TU tendon is mechanically linked by strong connective tissue to both the arthrodial membrane in the plane between sixth segment and telson and to the longitudinally oriented flexor tendon (Figs. 1, 2); this would appear to severely limit the TU muscle's independence from the axial musculature. Is the crayfish plan general for macrurans? Macrurans comprise two subgroups, the Reptantia or "crawlers," with abdomen flattened dorso-ventrally, and the Natantia or "swimmers," with abdomen flattened laterally. Upogebia, like crayfish, is a reptantian. Its telson muscles are virtually identical to those in crayfish with the exception that VTF is absent (Fig. IB). The telson of natantians, such as Pandalus, is narrower and the uropods more ventral than in Reptantia, but the four axial muscles in the telson are arranged as in crayfish (Figs. 1, 2). The TU muscles are also present and arise from a long, slim tendon that bifurcates to attach to the anterior-dorsal telson, lateral to the origin of AT, and to the posterior-dorsal margin of segment 6, and in mid-course to the arthrodial membrane and flexor tendon, as in Reptantia. The TU muscles are shorter, however, because. Please note that these images are extracted from scanned page images that may have been digital
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
