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FIGURE 7. Vulcanolepas scotiaensis Plate morphology. a in Vulcanolepas scotiaensis sp. nov., a new deep-sea scalpelliform barnacle (Eolepadidae: Neolepadinae) from hydrothermal vents in the Scotia Sea, Antarctica

FIGURE 7. Vulcanolepas scotiaensis Plate morphology. a: Capitulum (left side, exterior) showing plate arrangement (carina, rostrum and peduncle removed); b: Capitulum (interior) showing plate arrangement; c: Carina (exterior); d: Carina (interior); e: Rostrum (exterior); f: Rostrum (interior). From JC42-F-0396.

FIGURE 10b in Vulcanolepas scotiaensis sp. nov., a new deep-sea scalpelliform barnacle (Eolepadidae: Neolepadinae) from hydrothermal vents in the Scotia Sea, Antarctica

FIGURE 10b. Ratios of peduncle to capitulum length. Ratios of peduncle to capitulum lengths for the "robust" variety only. The extrapolation shown is a power regression, demonstrating that there is almost no correlation between growth and the ratio between peduncle and capitulum length. Data extracted from Figure 10a for the 14 specimens from JC42-F0122)

FIGURE 6 in Vulcanolepas scotiaensis sp. nov., a new deep-sea scalpelliform barnacle (Eolepadidae: Neolepadinae) from hydrothermal vents in the Scotia Sea, Antarctica

FIGURE 6. Vulcanolepas scotiaensis sp. nov., external morphology. a: Capitulum (left side, exterior), "gracile" form, peduncle truncated, from JC42-F-0396; b: Capitulum (left side, exterior), more heavily sculpted "robust" form (peduncle truncated), from JC42-F-0122; c: Complete animal (left side, exterior), more heavily sculpted "robust" form, showing a capitulum that is slightly longer than the peduncle, from JC42-F-0122; d: Complete animal (left side, exterior), "gracile" form, from JC42-F-0396; e: Complete animal (left side, exterior), "gracile" form (juvenile), from JC42-F-0396; f: Complete animal (right side, exterior), "gracile" form (adult) showing a peduncle that is at least ten times the length of the capitulum, from JC42-F-0396.

FIGURE 11 in Vulcanolepas scotiaensis sp. nov., a new deep-sea scalpelliform barnacle (Eolepadidae: Neolepadinae) from hydrothermal vents in the Scotia Sea, Antarctica

FIGURE 11. Benthic Ecology: The V. scotiaensis sp. nov. assemblage at the "Carwash" vent chimney in the E9 vent field (60°02.809S, 29°58904W), East Scotia Ridge Back-Arc Basin. a: Photograph DSCN9734, showing V. scotiaensis sp. nov. as the dominant organism living at this site. a specimen of the decapod Kiwa (arrowed) may be seen above and slightly to the right of the letter 'a'; a larger, pink anemone, Pacmanactis sp. (arrowed), is on the left margin. Image taken by the Scorpio stills camera on Isis, Dive 138. b: Photograph DSCN0191, showing detail of V. scotiaensis sp. nov. in feeding mode with extended, delicate, filamentous cirri. A specimen of the limpet Lepetodrilus sp. was grazing on the exterior of one of the larger peduncles (arrowed). Image taken by the Scorpio stills camera on Isis, Dive 140. Only the 'gracile variety' of V. scotiaensis sp. nov. is present in these two photographs, both taken at circa 2400 metres, where temperatures in the barnacle assemblage zone ranges between 5 and 19°C (Marsh et al., 2012). Scale: diameter of largest peduncle (arrowed) circa 6mm.

opennotspecifiedAug 2009View details →

FIGURE 2 in First records of the rare eelpout Lycenchelys xanthoptera Anderson, 1991 (Teleostei, Zoarcidae) in the Ross Sea, Antarctica

FIGURE 2. Capture sites of Lycenchelys xanthoptera. Weddel Sea (type locality) (♦); Ross Sea (●). Scale bar = 2000 km at 50o south.

opennotspecifiedAug 2009View details →

FIGURE 1 in First records of the rare eelpout Lycenchelys xanthoptera Anderson, 1991 (Teleostei, Zoarcidae) in the Ross Sea, Antarctica

FIGURE 1. Lycenchelys xanthoptera, Iselin Bank, Ross Sea, Antarctica. (a) Colour image of NMNZ P.038579, 268 mm SL, male: 4 years after preservation, C. Struthers NMNZ; (b) Line drawing of NMNZ P.038575, 269 mm SL, male, drawing, Michelle Freeborn NMNZ.

FIGURE 4. Radiolar tips. A in Notes on the species of Perkinsiana (Polychaeta: Sabellidae) from Antarctica with the description of P. brigittae sp. nov.

FIGURE 4. Radiolar tips. A) Perkinsiana antarctica from Bahía Laredo, B) P. milae from BF2/03, C) paratype of P. brigittae sp. nov. Scale bars: 0.15mm. Radiolar flanges as indicated with arrows in C.

FIGURE 3 in Notes on the species of Perkinsiana (Polychaeta: Sabellidae) from Antarctica with the description of P. brigittae sp. nov.

FIGURE 3. Scanning electron micrographs, Perkinsiana brigittae sp. nov. A) Thoracic chaetiger, B) paleate chaetae, C) thoracic uncini and companion chaetae, D) thoracic uncini, E) companion chaetae; F) abdominal uncini; G) chaetiger from anterior abdomen, H) chaetae from anterior abdomen; I) posterior abdominal chaetigers, J) chaetae from posterior abdomen. A–J) Paratype of P. brigittae sp. nov. Scale bars: A, H–J) 100 µm, B) 20 µm, C) 50 µm, D–F) 10 µm, G) 500 µm.

FIGURE 2 in Notes on the species of Perkinsiana (Polychaeta: Sabellidae) from Antarctica with the description of P. brigittae sp. nov.

FIGURE 2. Photographs, Perkinsiana brigittae sp. nov. A, E) Anterior thorax, dorsal view, B, F) same, ventral view, C, G) same, lateral view, D) dorsal and ventral lips, H) Sabellacheres antarcticus attached to a lateral radiole, I) pygidial eyes, dorsal view, J) pygidium, ventral view, K) radiolar tip, L) palmate membrane. A–C) Holotype, D–L) paratypes. Scales bars: A–G (1 mm); H–L (0.5 mm). Abbreviations: (apr) anterior peristomial ring, (dl) dorsal lip, (mr) mid-rib, (vl) ventral lip. Membrane as indicated with arrows in L.

FIGURE 1. Line drawings. A in Notes on the species of Perkinsiana (Polychaeta: Sabellidae) from Antarctica with the description of P. brigittae sp. nov.

FIGURE 1. Line drawings. A) Abdominal chaeta type A, B) abdominal chaeta type B, C) abdominal chaeta type C, D) collar and anterior thorax, dorsal view, E) same, ventral view, F) same, lateral view, G) posterior abdomen, H–I) dorsal and ventral lips, J) thoracic uncinus, K–L) abdominal uncini, M–O) companion chaetae, P) thoracic narrowly-hooded chaeta, Q) thoracic paleate chaeta, R) abdominal narrowly-hooded chaeta. A–C) redrawn from Fitzhugh (1989), D–R) Perkinsiana brigittae sp. nov. Holotype (D–G, J–R). Paratype (H–I). Scale bars: A–C (not scaled); D–I (1 mm); J–R (20 µm). Abbreviations: (apr) anterior peristomial ring, (dl) dorsal lip, (ll) lateral lamella, (mr) mid-rib, (vl) ventral lip.

opencc-by-nc-sa-2.0May 2019View details →

Data from: Effect of subshelf melt variability on sea level rise contribution from Thwaites Glacier, Antarctica

This archive includes output from the ice sheet model MALI used in the paper: Effect of subshelf melt variability on sea level rise contribution from Thwaites Glacier, Antarctica by Matthew Hoffman, et al. submitted to Journal of Geophysical Research-Earth Surface in May 2019. The contents of this archive are: * control_run: annual output file for the control run * main_ensembles: global statistics files for the 72 runs making up the main ensembles described in the paper and shown in Figures 4-6. * scaled_melt_ensemble: global statistics files for the scaled-melt ensemble shown in Figures 9 and 10. * linear_perturbation_runs: global statistics files for each of the linear perturbation runs used in Figure 11. The model code used to to generate the output and the scripts used to process the data are available here: https://github.com/matthewhoffman/MPAS-Model or https://github.com/MPAS-Dev/MPAS-Model in the commit 93359c339b6d06726f8e3fbbfadc19337c20c0c7 The processing scripts are in the directory: testing_and_setup/compass/landice/Thwaites_variability

FIGURES 9 –9 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 9 –9. Reproductions of the original drawings of Tropidoneis laevissima, Stauroneis charcotii and Amphora liouvillei. 91. Tropidoneis laevissima, as presented in West & West (1911: pl. XXVI, figs 115–119). Note that no scale bar was given originally. 92. Stauroneis charcotii and Amphora liouvillei, as presented in Peragallo (1921: pl. II). Fig. 17a, b refers to S. charcotii, and fig. 28 refers to A. liouvillei, as on pl. II in Peragallo (1921). Scale bar = 100 µm (Fig. 92).

FIGURES 57–59 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 57–59. SEM images of Craspedostauros laevissimus from the type material of Navicula skuae (sample collected by B.Fumanti on 25 December 1989, RO Herbarium Generale, Rome, Italy, for more details see Kochman-Kędziora et al. 2020). 57. External valve view. 58. Internal valve view. 59. Detail of the valve interior, showing the stauros on a wider hyaline area, the central raphe endings with double helictoglossa and the rounded areolar openings internally. Scale bars = 5 µm (Figs 57, 58); 1 µm (Fig. 59).

FIGURES 5 –56 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 5 –56. SEM images of Craspedostauros confusus sp. nov. from the type population (sample 14). 52. Internal valve view. 53. Close up of the central area internally, showing the narrow stauros on a wider hyaline area, the central raphe endings with double helictoglossa and the rounded to elliptic internal areolar openings. Arrow shows an areola with seven central pores, visible internally. 54. Close up of the apex with the pores of cribrate areolae internally (arrows). 55. Close up of the central area of another valve of the same population, showing once again the narrow stauros, the internal central raphe endings with double helictoglossa and rounded internal areolar openings. 56. Close up of the apex with rounded to elliptic and even somewhat irregular in shape internal areolar openings. Scale bars = 5 μm (Fig. 52); 1 μm (Figs 53–56).

FIGURES 86–90 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 86–90. SEM images of Craspedostauros confusus sp. nov. and C. laevissimus from several populations from Livingston Island. 86. External valve view of Craspedostauros laevissimus (sample LT10). 87. Close up of the striae of the same valve, showing the occasionally present enlarged areolae near the raphe, without central pores (arrow). Note the density of areolae in comparison to Fig. 88 below. 88–90. Close ups of the central area (Fig. 88) and apices (Figs 88–90) of Craspedostauros confusus sp. nov. (sample MO'), showing the typically enlarged cribrate areolae near the raphe, usually with several central pores. Scale bars = 5 μm (Fig. 86); 1 μm (Figs 87–90).

FIGURES 60–85 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 60–85. LM images of Craspedostauros confusus sp. nov. and C. laevissimus from several populations from Livingston Island. 60–67. Craspedostauros confusus sp. nov. (sample DNA5). 68–77. Craspedostauros confusus sp. nov. (sample LT6). 78–79. Craspedostauros confusus sp. nov. (sample MO'), Fig. 78 showing a frustule with numerous copulae in girdle view. 80–84. Craspedostauros laevissimus (sample LT10). 85. Craspedostauros laevissimus (sample 13). Scale bar = 10 µm.

FIGURES 5 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 5–. SEM images of Craspedostauros laevissimus (sample 11). 35. External valve view showing the distal raphe endings and the curved central raphe endings. Note the areolae, clearly having one, or no central pore (arrows). 36. External valve view of one apex with bent, and the second apex with almost hooked distal raphe ending. 37. Close up of the central area of the same valve, showing that no central pores are present in cribrate areolae. 38. Close up of the apex of the same valve with the distal raphe ending and areolae. 39. External valve view with bent distal raphe endings. 40. Close up of the central area. Arrows showing the presence of areolae with no central pore or with one central pore, and four or five peripheral pores. 41. Close up of the apex of the same valve showing a cribrate areola with two central pores (arrow). Note also the presence of areolae with four or five peripheral pores, but lacking a central pore, or having only one central pore (black arrows). Scale bars = 5 μm (Figs 35, 36, 39); 1 μm (Figs 37, 38, 41).

FIGURES 8–5 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 8–5. SEM images of Craspedostauros confusus sp. nov. from the type population (sample 14). 48. External valve view. 49. Close up of the central area with drop-like expanded central raphe endings and cribrate areolae. Note that areolae near the raphe are clearly larger than the others (arrow) and having one to three central pores. 50. Close up of the apex of the same valve with the hooked distal raphe ending and areolae around the apex. 51. External valve view, showing once again the hooked distal raphe endings and the enlarged areolae near the raphe. Scale bars = 5 μm (Figs 48, 51); 1 μm (Figs 49, 50).

FIGURES 9 in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES 9–. SEM images of Craspedostauros laevissimus (sample 11). 29. External valve view. 30. Close up of the central area of the same valve showing the expanded central raphe endings and cribrate areolae. 31. Close up of the apex of the same valve showing the bent and expanded distal raphe endings and a cribrate areola with two central pores (white arrow). Note the presence of areolae and pores around the raphe endings on the apex (black arrows). 32. External valve view. 33. Same valve, close up of the central area with the expanded and slightly curved central raphe endings. Arrow shows a cribrate areola with three central pores. 34. Same valve, close up of the apex with white arrows showing the presence of both areolae with and without central pores. Note also the presence of areolae and pores on the apex (black arrows). Scale bars = 5 μm (Figs 29, 32); 1 μm (Figs 30, 31, 33–34).

FIGURES – 7. SEM images of Craspedostauros laevissimus from different populations. 42. Close up of the central area externally, showing the weakly expanded central raphe endings and the cribrate areolae with usually four to five peripheral pores and up to one central pore (sample 13). 43. Close up of the central area internally, showing the narrow stauros located in a wider hyaline area, the central raphe endings with double helictoglossa, and the rounded to rectangular areolar openings internally (sample 13). 44. Close up of the apex, showing the bent distal raphe endings, cribrate areoale with up to six peripheral pores and up to two central pores (sample 13). 45. Close ups of both the valve exterior and interior (sample 11), showing the weakly expanded central raphe endings externally; the areolae near the raphe with usually four to five peripheral pores and one central pore; the central raphe endings with double helictoglossa and the rounded areolar openings internally. 46. Internal valve view, showing the narrow transverse rib of silica at the valve center (strauros) and the central raphe endings with double helictoglossa (sample 11). 47. Close up of the apex of the same valve internally, showing the rounded to square or rectangular areolar openings (sample 11). Scale bars = 5 μm (Fig. 46); 1 μm (Figs 42–45,47). in The genus Craspedostauros E.J.Cox (Bacillariophyta) on the coasts of Livingston Island, Maritime Antarctica

FIGURES – 7. SEM images of Craspedostauros laevissimus from different populations. 42. Close up of the central area externally, showing the weakly expanded central raphe endings and the cribrate areolae with usually four to five peripheral pores and up to one central pore (sample 13). 43. Close up of the central area internally, showing the narrow stauros located in a wider hyaline area, the central raphe endings with double helictoglossa, and the rounded to rectangular areolar openings internally (sample 13). 44. Close up of the apex, showing the bent distal raphe endings, cribrate areoale with up to six peripheral pores and up to two central pores (sample 13). 45. Close ups of both the valve exterior and interior (sample 11), showing the weakly expanded central raphe endings externally; the areolae near the raphe with usually four to five peripheral pores and one central pore; the central raphe endings with double helictoglossa and the rounded areolar openings internally. 46. Internal valve view, showing the narrow transverse rib of silica at the valve center (strauros) and the central raphe endings with double helictoglossa (sample 11). 47. Close up of the apex of the same valve internally, showing the rounded to square or rectangular areolar openings (sample 11). Scale bars = 5 μm (Fig. 46); 1 μm (Figs 42–45,47).