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9 results for “Ptygura”
FIGURE 7. Ptygura thalenoiensis n in Diversity of sessile rotifers (Gnesiotrocha, Monogononta, Rotifera) in Thale Noi Lake, Thailand
FIGURE 7. Ptygura thalenoiensis n. sp. 7a, 7b: tube structure in different specimens, 7c: Trophi SEM photograph, frontal view. Scale bars: 7a, 7b = 100 µm, 7c = 5 µm.
FIGURE 6. Ptygura thalenoiensis n in Diversity of sessile rotifers (Gnesiotrocha, Monogononta, Rotifera) in Thale Noi Lake, Thailand
FIGURE 6. Ptygura thalenoiensis n. sp. 6a: adult female; 6b: apical region, showing the mouth and ciliated cylindrical process; 6c: contracted specimen, apical region, showing the dorsal hooks. Scale bars: 6a = 100 µm; 6b, 6c = 50 µm.
FIGURE 3 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 3. SEM images of the dorsal plate. A: antero-ventral region of a dried specimen of Beauchampia crucigere showing the body integument (b) and the dorsal plate (dp) with its stiffened tubular process (t) containing the dorsal antenna (da) with the terminal sensory filaments coming out the end. B: dorsal plate of a dried specimen of Limnias melicerta showing the dorsal plate (dp) with its species-specific seven protrusions (p). C: antero-dorsal region of a specimen of Ptygura ctenoida fixed with hot glutaraldehyde showing the body integument (b) and the dorsal plate (dp) with its aligned short hooks (sh). D: dorsal plate (dp) and long branched hooks (bh) of a dried specimen of Ptygura furcillata. E: dried specimen of Ptygura innominata showing the body integument (b) and the dorsal plate (dp) with its long-branched, antler-like hooks (ah). F: closeup of figure E, showing pores (arrowhead) and difference of surface ultrastructure between the dorsal plate (dp) and the body integuments (b). Arrows mark continuity between dorsal plate and the rest of the integument. Bars: 20 µm for A to E; 5 µm for F.
FIGURE 2 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 2. Presence and absence of birefringent bodies in late-stage embryos that have not been previously reported in some sessile rotifers. Birefringent body absent: A) Ptygura ctenoida, late-stage embryo (fixed with hot glutaraldehyde) and freeswimming larva in lateral and dorsal view. B) Ptygura innominata, late-stage embryo, and free-swimming larva in lateral and dorsal view. C) Limnias ceratophylli, late-stage embryo, and free-swimming larva in dorsal view (foot contracted). Birefringent body present: D) Ptygura longicornis, free swimming larva in dorsal view. E) Ptygura stygis, free swimming larva in dorsal view. F) Ptygura tridorsicornis, free-swimming larva in dorsal view. Arrows mark birefringent bodies. Bar: 50 µm, same scale for all images.
FIGURE 6 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 6. Transmission Electron Microscope images of the dorsal plate. Inset: Light photomicrograph of a sub-sagittal section of a specimen of Limnias ceratophylli in its tube stained with blue toluidine. A: TEM image of the inset white line square area showing the inwards fold of the dorsal plate and the transition from the dorsal plate integument to the body one. The dark grey perimetral band is the intracellular lamina (ICL) of the integument. In this image the transition zone has been obliquely sectioned (circles in the ICL of this zone are pores), so the ICL thickness appeared enlarged here with the two types of glycocalyx overlapping. B: Transition from the dorsal plate to the body integument in transversal section. The transition is not progressive, but abrupt. See text for details. Symbols: b, body integument; v, vesicules at the base of pores; c, cisterns; cc, corona ciliature; dp, dorsal plate; if, inwards fold of the dorsal plate; p, pores; ph, pharynx; t, tube; tr, trophi; sy, syncytial integument. Bars: 2 µm for A, B, and 50 µm for inset.
FIGURE 1 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 1. Light microscopy images of dorsal plates in selected sessile taxa. A: in vivo with corona open; lateral view. B: in vivo with corona retracted. C: dorsal plate revealed with bleach treatment. D: species lacking dorsal plate with bleach treatment. A and B: arrows mark the dorsal plates. Bc, Beauchampia crucigere; Lc, Limnias ceratophylli; Lm, Limnias melicerta; Pb, Ptygura beauchampi; Pc, Ptygura ctenoida; Pf, Ptygura furcillata; Pi, Ptygura innominata; Pl, Ptygura longicornis; Pm, Ptygura mucicola; Ps, Ptygura stygis; Pt, Ptygura tridorsicornis. Bars: 50 µm for A and B, 20 µm for C and D.
FIGURE 7 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 7. Relationship between dorsal plate and corona arrangement. Photographs from top to bottom: A: Ptygura longicornis (no dorsal plate). Next, representative species with dorsal plate: B: P. mucicola, C: P. furcillata, D: Limnias melicerta, and E: Beauchampia crucigere. Diagrams show the different layout models of the cephalic region: A: no dorsal plate, no dorsal gap ciliature, neck dorsal flexion, corona plane transversal to the body axis, opened dorsally; B: dorsal plate with short hooks, small dorsal gap ciliature, no dorsal flexion, corona plane transversal, opened frontally; C: dorsal plate with long hooks, wide dorsal gap ciliature, no dorsal flexion, corona in the frontal plane, opened dorsally; D: dorsal plate with protrusions, wide dorsal gap ciliature, no dorsal flexion, corona plane from transversal to frontal, opened dorsally; E: dorsal plate with long tube protecting the dorsal antenna, medium size dorsal gap ciliature, slightly ventral flexion, corona plane transversal, opened frontal to ventrally. Diagram columns from left to right: ventral view, lateral view, dorsal view. Symbols: thin black line, trunk, pharynx, and corona basal field; thick black line, corona ciliature; thick light grey line, dorsal gap; dark grey, dorsal plate and processes; dotted lines, body planes frontal (F), transverse (T) and medial (M). Bars: 50 µm, same scale for all images.
FIGURE 5 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 5. Scanning Electron Microscope images of trophi of two Ptygura species. Trophi of Ptygura innominata in frontal (A) and caudal view (B), and trophi of Ptygura ctenoida in frontal (C) and caudal view (D). Bar: 5 µm, same scale for all images.
FIGURE 4 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)
FIGURE 4. Comparison of dorsal plate bearing species with species lacking a dorsal plate. A: Lateral view of the anterior half of Ptygura ctenoida showing the corona ciliature (cc), the mouth (m), the dorsal plate (DP), the short hooks (h), and the trunk (t). B: Dorsal view of the anterior half of Ptygura sp. showing the corona ciliature (cc), the apical field of the corona (af), the dorsal gap in the corona ciliature (dg), a lateral antenna (la), the trunk (t), the cloaca opening (cl), and part of the foot (f). C: trunk (t) and head of a specimen of Ptygura thalenoiensis showing the dorsal antenna opening (da) located in the middle of a pair of dorsal hooks (dh), the lateral antennae (la), the opening of corona and mouth (mco), and the papillate ring on the trunk (pr). D: closeup of the paired dorsal hooks (dh) and dorsal antenna opening (da) of another specimen of Ptygura thalenoiensis; note the grooves and ridges of the integument. Bars: 20 µm for A, B, and C; 5 µm for D.
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