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FIGURE 19. Pyura vannamei. A in Ascidians collected during the Madibenthos expedition in Martinique 3. Stolidobranchia, Pyuridae and Molgulidae

FIGURE 19. Pyura vannamei. A dissection (stained); B, one specimen in formalin; C, prepharyngeal area (stained). Scale bars A and C = 1cm.

FIGURE 10. Pyura discrepans. A in Ascidians collected during the Madibenthos expedition in Martinique 3. Stolidobranchia, Pyuridae and Molgulidae

FIGURE 10. Pyura discrepans. A, specimen with tunic; B, specimen without tunic; C, detail of the dorsal lamina (stained). Scale bars A,B = 1cm.

FIGURE 9. Microcosmus helleri. A in Ascidians collected during the Madibenthos expedition in Martinique 3. Stolidobranchia, Pyuridae and Molgulidae

FIGURE 9. Microcosmus helleri. A, right part of the branchial sac (stained), scale bar = 1cm; B, oral siphon; C, dorsal tubercle (stained).

FIGURE 8. Microcosmus helleri. A in Ascidians collected during the Madibenthos expedition in Martinique 3. Stolidobranchia, Pyuridae and Molgulidae

FIGURE 8. Microcosmus helleri. A, agglomerated specimens, scale bar = 1cm; B, isolated specimen; C, dissection, scale bar = 1cm.

FIGURE 2. Halocynthia microspinosa. A in Ascidians collected during the Madibenthos expedition in Martinique 3. Stolidobranchia, Pyuridae and Molgulidae

FIGURE 2. Halocynthia microspinosa. A, one specimen, scale bar = 1cm; B, siphon spines; C, gut loop.

FIGURE 1. Bathypera goreaui. A in Ascidians collected during the Madibenthos expedition in Martinique 3. Stolidobranchia, Pyuridae and Molgulidae

FIGURE 1. Bathypera goreaui. A, one specimen, scale bar = 2mm; B,C, dorsal and ventral sides of a specimen without tunic; D, dissection (stained).

FIGURE 3 in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 3. Aplidium marplatensis Maggioni & Tatián (sp. nov. present work). A: colony; B: zooid; C: larva.

FIGURE 11 in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 11. Cnemidocarpa drygalskii (Hartmeyer, 1911). A: individual; B: oral tentacles, dorsal tubercle, pre-pharyngeal band and branchial sac (part); C: detail of musculature (right side).

FIGURE 10. Ascidia meridionalis Herdman, 1880. A in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 10. Ascidia meridionalis Herdman, 1880. A: individual without tunic; B: oral tentacles, dorsal tubercle and prepharyngeal band; C: detail of branchial sac: stigmata and papillae.

FIGURE 15 in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 15. Asajirus indicus (Oka, 1913). A: individual with tunic; B: dorsal side with details of circular musculature, nervous system, atrial aperture and gonads (test removed); C: ventral side with detail of longitudinal muscles, stomach and gonads (test removed); D: ventral side of pharynx showing circular perforations.

FIGURE 14 in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 14. Molgula setigera Ärnbäck-Christie-Linde, 1938. A: right gonad with two vas deferens (arrows); B: left gonad with tree vas deferens (arrows); C: right gonad with four vas deferens (arrows); D: left gonad with one vas deferens (arrow) and oviduct bent ventrally (*).

FIGURE 8 in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 8. Polysyncraton trivolutum (Millar, 1960). A: colony; B: detail of oral apertures packed with spicules; C: surface of colony showing zooids (pink colored) and oval eggs. (orange colored); D: zooid with detail of coiled vas deferens at its base.

FIGURE 4 in Deep-sea ascidians (Chordata, Tunicata) from the SW Atlantic: species richness with descriptions of two new species

FIGURE 4. Aplidium solitarium Maggioni & Tatián (sp. nov. present work). A: colony; B: zooid; C: larva.

Fig. 1 in Cytoplasmic UV-R Absorption in an Integumentary Matrix (tunic) of Photosymbiotic Ascidian Colonies

Fig. 1. Transmittance (%) of 250-800 nm light for the bandpass filters U340 (thick line) and CT330/20 (thin line) measured with a spectrophotometer Genesis 10S UV-Vis.

Fig. 5 in Cytoplasmic UV-R Absorption in an Integumentary Matrix (tunic) of Photosymbiotic Ascidian Colonies

Fig. 5. Tunic cells in the surface tunic of Diplosoma virens. A, Bladder tunic cells. B, Tunic net cells (= myocyte sensu Mackie and Singla, 1987). C-E, Other types of tunic cells with vacuoles containing electron-dense materials or clear vesicles. Scale bars: 5 µm in A, 2 µm in B-E.

Fig. 4. A in Cytoplasmic UV-R Absorption in an Integumentary Matrix (tunic) of Photosymbiotic Ascidian Colonies

Fig. 4. A, Histological cross-section of the Diplosoma virens colony showing surface tunic (su) and middle layer (md). B and C, UV images of the surface tunic of D. virens (band-pass filter: U340). D and E, a pair of UV images of the surface tunic of D. simile (band-pass filter: U340 for D, U340 + CT330/20 for E). Arrows indicate some cell-like objects absorbing UV-R. Arrowhead in C indicates Prochloron cells. bl, tunic bladder cell; bs, branchial sac; cc, cloacal cavity; st, stomach. Scale bars: 100 µm in A, 50 µm in B-E.

Fig. 3 in Cytoplasmic UV-R Absorption in an Integumentary Matrix (tunic) of Photosymbiotic Ascidian Colonies

Fig. 3. Pair images of cross-sections of Diplosoma virens (A, B) and D. simile (C, D) observed with an oblique epi-illumination of white- LED (A, C) and a transmission light filtered with U340 (B, D). The colonies have a three-layer structure: surface tunic (su), middle layer (md), and basal tunic (ba). Rectangles in A and B indicate an aggregate of pigmentary tunic cells. Green areas are cloacal cavities filled with Prochloron cells. em, embryo; fe, feces in rectum; os, oral siphon; st, stomach. Scale bars = 0.5 mm.

Fig. 2 in Cytoplasmic UV-R Absorption in an Integumentary Matrix (tunic) of Photosymbiotic Ascidian Colonies

Fig. 2. Absorption spectra of the surface tunic of Diplosoma virens (A) and D. simile (B). Spectra from four specimens are shown for each species. A prominent absorption peak is present at approximately 325 nm in each spectrum.

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The Dutch Ascidians Homepage

<p>This website shows photographs of ascidian species from all over the world. The goal of each species page is to show several photographs of that species, preferably at different localities, to get an idea of the intra-specific variation present.</p> <p>http://www.ascidians.com/</p>