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8 results for “Potamethus”
FIGURE 4 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 4. Light microscopy of thoracic chaetae of paralectotypes of Potamethus filatovae (Levenstein, 1961) n. comb. A) Collar chaetiger, B) narrowly hooded chaetae from collar, C) paleate chaetae, D) chaetiger 3, E) paleate chaetae.
FIGURE 7 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 7. Light microscopy images of thoracic and abdominal chaetae of Potamethus malmgreni (Hansen, 1878) from the Norwegian Sea. A) Collar chaetiger, B) close up of collar chaetae, C–E) thoracic uncini and companion chaetae from chaetiger 4, F) thoracic chaetiger 5, G) superior thoracic elongate, narrowly hooded chaetae from chaetiger 5, H) inferior paleate chaetae from chaetiger 5, I) abdominal chaetiger 6, J, K) abdominal uncini from chaetiger 4, L) detail of inferior group of abdominal chaetae from chaetiger 6. Scale bars: A) 100 µm, rest not to scale.
FIGURE 1 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 1. Potamethus filatovae (Levenstein, 1961) n. comb., lectotype stained with methylene blue. A) Peristomial moldures and first three thoracic chaetigers, dorsal view, B) collar and base of radiolar crown, ventral view, C) base of radiolar crown, peristomium and first three thoracic chaetigers, lateral view, D) thorax, ventral view, E) mid-abdominal segments, ventral view, F) posterior end, dorsal view, G) distal ends of radioles. Abbreviations: apr—anterior peristomial ring, fg—faecal groove switch, pl—parallel lamella, pm)—peristomial moldure, vs—ventral sacs, vsc—ventral shield of collar. Numbers: 1, 2, 3 …—number of chaetigers. Scale bars: A–C, F) 500 um, D) 2 mm, E) 1 mm, G) 2.5 mm. White arrow and asterisk in B points to the incised mid-ventral margin of collar.
FIGURE 6 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 6. Potamethus malmgreni (Hansen, 1878) from the Norwegian Sea stained with methylene blue, light microscopy images. A) Collar and base of radiolar crown, ventral view, B) same, dorsal view, C) same, ventral view, D) ventral shields and transition of thorax and abdomen, E) ventral shields from posterior abdomen, F) thoracic uncini, arrow points to uncinal hump. Abbreviations: 1, 2) number of chaetigers, apr) anterior peristomial ring, pl) parallel lamella, vsa) ventral shields of abdominal segments, vsc) ventral shield of collar, vst) ventral shield of thoracic segments. Scale bars: A–C, E) 500 µm, D) 1 mm, F) not scaled.
FIGURE 2 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 2. Potamethus filatovae (Levenstein, 1961) n. comb., paralectotypes stained with methylene blue. A) Peristomium and first three thoracic chaetigers, latero-dorsal view, B) peristomium and first three thoracic chaetigers, dorsal view, C) base of radiolar crown, peristomium and first two thoracic chaetigers, dorsal view, D) base of radiolar crown and collar, lateral view, E) base of radiolar crown and collar, ventral view, F) internal wall of tube with oocytes, G) worm partially exposed from tube. Abbreviations: apr—anterior peristomial ring, pl—parallel lamella, pm—peristomial moldure, vs—ventral sacs, vsc—ventral shield of collar. Numbers: 1, 2, 3 …—number of chaetigers. Scale bars: A, B) 1.25 mm, C–E) 500 um, F–G) 2.5 mm. Black arrow in B points to the triangular, mid-dorsal margin of anterior peristomial ring. Black arrow and asterisk in E points to the incised mid-ventral margin of collar, other two black arrows points to the diagonal glandular shields at the base of ventral lappets.
FIGURE 3 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 3. Scanning electron and light microscopy of thoracic chaetae and uncini of paralectotypes of Potamethus filatovae (Levenstein, 1961) n. comb. A–B) Narrowly hooded chaetae from collar (chaetiger 1), C) chaetiger 2, D) superior group of elongate, narrowly hooded chaetae from chaetiger 2, E) chaetiger 3, F) inferior paleate chaetae from chaetiger 3, G) chaetiger 4, H) inferior group of paleate chaetae from chaetiger 8, I) companion chaeta of chaetiger 2, J) uncini from chaetiger 2, K) dentition of uncini of chaetiger 2, L) torus of chaetiger 3 (uncini and companion chaetae), M) details of companion chaetae of chaetiger 3. Light microscopy: A–B, I–J. SEM: C–H, K–M. Scale bars: A) 200 μm, B, I) 20 μm, C–E, G, J) 100 μm, F) 10 μm, H, K–M) 30 μm.
FIGURE 5 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 5. Scanning electron and light microscopy images of abdominal chaetae and uncini of paralectotypes of Potamethus filatovae (Levenstein, 1961) n. comb. A) Abdominal chaetiger 8 with inferior group of chaetae remarked with a rectangle, B–D) details of narrowly hooded chaetae of inferior group from abdominal chaetiger 8; E) abdominal chaetiger 3, F) details of narrowly hooded chaetae of inferior group from abdominal chaetiger 3, G) abdominal chaetiger 17, H) dentition of uncini from abdominal chaetiger 7, I) dentition of uncini from abdominal chaetiger 17, J) uncini from abdominal chaetiger 1, K) uncini from abdominal chaetiger 12, L) uncini from abdominal chaetiger 45, L). SEM: A–I. Light microscopy: J–L. Scale bars: A, E, G) 100 μm, B, C, F) 30 μm, D) 3 μm, H–L) 10 μm. Arrows in J and K point to uncinal humps.
FIGURE 8 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation
FIGURE 8. Line drawings of uncini of the species of the genus Potamethus with humps shown by arrows (redrawn from original descriptions). A–C) P. elongatus, D) P. malmgreni, E, F) P. murrayi, G–I) P. scotiae, J) P. spathiferus. Thoracic uncini: A, B, D, E, G–H, J. Abdominal uncini: C, F, I. Sources: A) Treadwell, 1906, B, C) Berkeley & Berkeley, 1951, D) Hansen, 1882, E, F) McIntosh, 1916, G–I) Pixell, 1913, J) Ehlers, 1887.
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