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261 results for “Hexactinellida”
FIGURE 7 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 7. Palaeogeographic distributions of species of Teganium (all species in B originally assigned to Teganiella). A, Ordovician (Sandbian, 458 Ma). B, Carboniferous (Visean, 340 Ma). Map constructed using GPlates (Müller et al. 2018) using data from Torsvik & Cocks (2016). Does not include unconfirmed taxa listed by Ruedemann (1925b, 1934, 1942).
FIGURE 6 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 6. Teganium sp., from the Middle Ordovician Castle Bank Biota, Wales. A, NMW.2021.3G.76i and ii, overall view, with positions of detail images indicated by boxes (all rotated). B, apex of NMW.2021.3G.76i, apex of sponge showing extensive marginalia; C, detail of body wall showing characteristic texture (boxed area enlarged inset); D, apex of NMW.2021.3G.76ii, with oscular margin and trace of marginalia. Scale bars: A equals 10 mm; B–D equal 1 mm.
FIGURE 5 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 5. Cut-away reconstruction of Teganium avalonensis sp. nov., with detail of wall structure on the right; dermal/hypodermal skeleton in lower part, and choanosomal layer with exhalent canals in upper part.
FIGURE 3 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 3. Teganium avalonensis sp. nov. A, paratype NMW.2021.3G.74; apical part with marginalia, imaged with directed light (from right) to highlight texture of body wall; B, paratype NMW.2021.3G.98, with low-angle light to highlight diagnostic texture of body wall (boxed area enlarged inset); C–F, paratype NMW.2021.3G.82, partial specimen with the boxes in C indicating positions of D, E and F; D, lateral detail to show reticulate skeletal grid (plane-polarised light); E, detail showing scale of minute triaxon spicules within the same area; centres of several spicules arrowed; F, detail of central part of specimen in cross-polarised light (contrast enhanced) to highlight the small circular cavities within choanosomal (internal) layer of body wall. Scale bars: A, B, D, F equal 1 mm; C equals 5 mm; E equals 0.1 mm.
FIGURE 2 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 2. Teganium avalonensis sp. nov., from the Middle Ordovician Castle Bank Biota, Wales. A–B: paratype slab NMW.2021.3G.72, with pair of sponges in A, plane-polarised light, and B, cross-polarised; C, E, holotype NMW.2021.3G.71: C, overall view, with box indicating area enlarged in E; E, detail of basal region showing projecting basalia; D, paratype NMW.2021.3G.73, overall view. Scale bars: A–D equal 5 mm; E equals 1 mm.
FIGURE 4 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 4. Paratypes of Teganium avalonensis sp. nov. A, NMW.2021.3G.77; B, NMW.2021.3G.98 in cross-polarised light (boxed area enlarged in Figure 3B); C, NMW.2021.3G.78 with pair of specimens, the right-hand one with marginalia; D, NMW.2021.3G.79; E, NMW.2021.3G.81 with multiple specimens, in cross-polarised light; F, NMW.2021.3G.80. Scale bars equal 1 mm.
FIGURE 1 in Teganium (Porifera, Hexactinellida) from the Middle Ordovician Castle Bank fauna of Avalonia (Wales, UK)
FIGURE 1. Locality map (left) and local stratigraphy of the Castle Bank locality, showing occurrence of Teganium avalonensis sp. nov. within the Castle Bank sequence (mainly siltstone, with shading representing colour of sediment; v: volcanic ash layers). Exact locality information is deposited with the specimens.
FIGURE 5 in A new species of glass sponge (Hexactinellida: Sceptrulophora: Uncinateridae) from the Weijia Seamount in the northwestern Pacific Ocean
FIGURE 5. Tretopleura weijicus sp. nov., spicules. A. Dermal pentactins or subhexactins, whole and enlargements of tangential ray, proximal ray and distal rays with a clavate tip, a spherical or bullet-like swelling. B. Atrial pentactins or subhexactins, whole and enlargements of two tangential rays, proximal ray and cylindrical distal rays with two sizes in length. C. Dermal hexactins, whole and enlargements of tangential, proximal and distal rays. D. Atrial hexactins, whole and enlargements of tangential, proximal and distal rays. E. Uncinate, whole and enlargements of middle segment and two ends. F. Sceptrules, as discoscopules, whole and enlargements of two types of upper ends, tine tip, middle segment and lower end. G. Discohexasters of type I (G1) and type II (G2), whole and enlargement of terminal ray.
FIGURE 6 in A new species of glass sponge (Hexactinellida: Sceptrulophora: Uncinateridae) from the Weijia Seamount in the northwestern Pacific Ocean
FIGURE 6. Maximum-likelihood tree based on concatenated data of COI and 16S. Scep. inc. sed., Sceptrulophora incertae sedis; Hexa. inc. sed., Hexasterophora incertae sedis.
FIGURE 4 in A new species of glass sponge (Hexactinellida: Sceptrulophora: Uncinateridae) from the Weijia Seamount in the northwestern Pacific Ocean
FIGURE 4. Tretopleura weijicus sp. nov., SEM of horizontal wall sections. A. Dermal cortex with epirhyses in surface view located in the marginal lamellar area (A1), axially arched area (A3) and their transition area (A2). B. Four types of dermal spurs. C. Atrial cortex with aporhyses in surface view located in the marginal lamellar area (C1) and axially arched area (C2). D. Two types of atrial spurs. E. Framework of primary middle layer in dorsal view of dermal cortex, growth margin towards right. F. Two connecting elements of longitudinal strands. G. Attached microhexactins.
FIGURE 2 in A new species of glass sponge (Hexactinellida: Sceptrulophora: Uncinateridae) from the Weijia Seamount in the northwestern Pacific Ocean
FIGURE 2. Tretopleura weijicus sp. nov., surfaces of holotype. A. Dermal surface, consisting of middle axially area, marginal area and the transition area between them. B. Atrial surface, consisting of middle axially area and marginal areas. C. Dermal surfaces located in the marginal area (C1), axial area (C3), the transition area between marginal and axial areas (C2), and the close-up image of epirhyses (C4). D. Atrial surfaces located in the marginal area (D1), axial area (D2), and the close-up image of aporhyses (D3).
FIGURE 3 in A new species of glass sponge (Hexactinellida: Sceptrulophora: Uncinateridae) from the Weijia Seamount in the northwestern Pacific Ocean
FIGURE 3. Tretopleura weijicus sp. nov., vertical-longitudinal wall section. A. Vertical-longitudinal section, dermal side up, consisting of an unchannelized primary middle layer (p. m. l.), channelized dermal peripheral layer (d. p. l.), and atrial peripheral layer (a. p. l.) as indicated at right. B. SEM of dictyonal framework in the d. p. l. consisting of irregularly connected hexactins. C. SEM of dictyonal framework in the p. m. l. delimited by longitudinal stands composed of serially attached and aligned hexactins. D. SEM of dictyonal framework in the a. p. l.
FIGURE 1 in A new species of glass sponge (Hexactinellida: Sceptrulophora: Uncinateridae) from the Weijia Seamount in the northwestern Pacific Ocean
FIGURE 1. Tretopleura weijicus sp. nov., specimen of holotype. A. In situ images. B. Whole collected specimen (atrial surface). C. Transverse view of the peduncle. D. Basal part of peduncle.
FIGURE 5 in Redescription of two Hexactinosida (Porifera, Hexactinellida) from the southwestern Atlantic, collected by Programme REVIZEE
FIGURE 5: Free megascleres of Dactylocalyx pumiceus Stutchbury, 1841. A. pentactins. B. hexactins (Scale bars = 100μm).
FIGURE 4 in Redescription of two Hexactinosida (Porifera, Hexactinellida) from the southwestern Atlantic, collected by Programme REVIZEE
FIGURE 4: Dactylocalyx pumiceus Stutchbury, 1841. A. preserved specimen (MNRJ 3253). B–F, SEM. B. dermal surface. C. discohexaster. D. terminal disc of discohexaster. E. onychexaster. F. terminal disc of onychexaster (Scale bars: A= 20mm, B = 500μm, C, E = 10μm, D, F = 2μm).
FIGURE 3 in Redescription of two Hexactinosida (Porifera, Hexactinellida) from the southwestern Atlantic, collected by Programme REVIZEE
FIGURE 3: Spicules of Aphrocallistes beatrix Gray, 1858. A. dermal pinule. B. parenchymal hexactin. C. variety of scopules. D. uncinates. E. diactins. F. hemihexasters. G. discohexasters. H. oxyhexaster (Scale bars: A = 50μm, B, F = 20μm, CE = 100μm, GH = 10μm).
FIGURE 1 in Redescription of two Hexactinosida (Porifera, Hexactinellida) from the southwestern Atlantic, collected by Programme REVIZEE
FIGURE 1: Map of South America with the location of the collecting sites for Aphrocallistes beatrix Gray,
FIGURE 9 in Revision of the subgenus Neopsacas (Hexactinellida, Rossellidae, Crateromorpha) with the description of new species and subspecies
FIGURE 9. Crateromorpha (Neopsacas) obi, sp. nov., spicules: A–B, dermal or atrial pentactins. B, pentactin with rudimental ray directed inside the body. C, hypodermal or hypoatrial pentactin. D, hypodermal or hypoatrial hexactin. E–F, parts of choanosomal diactin. G, drepanocome. H, secondary ray of drepanocome.
FIGURE 7 in Revision of the subgenus Neopsacas (Hexactinellida, Rossellidae, Crateromorpha) with the description of new species and subspecies
FIGURE 7. Crateromorpha (Neopsacas) krinovi discoli ssp. nov., spicules: A–E, atrial diactin. F, atrial monactin. G, atrial tauactin. H, hypodermal pentactin. I, choanosomal diactin. J, discohexactin. K–L, discopentactins. M, discostauractin. N, discoparatetractin. O, discodiactin ("amphidisc").
FIGURE 6 in Revision of the subgenus Neopsacas (Hexactinellida, Rossellidae, Crateromorpha) with the description of new species and subspecies
FIGURE 6. Crateromorpha (Neopsacas)) krinovi discoli ssp. nov. USNM 1096678. A, side view. Scale 15 mm. B, hypodermal hexactin.
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