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Putative photosensitivity in internal light organs (organs of Pesta) of deep-sea sergestid shrimps
<p>Many marine species can regulate the intensity of bioluminescence from their ventral photophores in order to counterilluminate, a camouflage technique whereby animals closely match the intensity of the downwelling illumination blocked by their bodies, thereby hiding their silhouettes. Recent studies on autogenic cuticular photophores in deep-sea shrimps indicate that the photophores themselves are light-sensitive. Here, our results further suggest photosensitivity in a second type of autogenic photophore, the internal organs of Pesta, found in deep-sea sergestid shrimps. Experiments were conducted ship-board on live specimens, exposing the animals to bright light, which resulted in ultrastructural changes that matched those seen in crustacean eyes during the photoreceptor membrane turnover, a process that is crucial for the proper functioning of photosensitive components. In addition, RNA-seq studies demonstrated the expression of visual opsins and phototransduction genes in organs of Pesta tissue that are known to play a role in light detection, and electrophysiological measurements indicated that the light organs are responding to light received by the eyes. The long-sought-after mechanism of counterillumination remains unknown, but evidence of photosensitivity in photophores may indicate a dual functionality of light detection and emission.</p>
Figure 16 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 16. Proportion of the harpacticoids inhabiting different sediment layers along the depth gradient.
Figure 10 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 10. Proportion of the main Metazoa taxa inhabiting along depth gradient at the Bosporus outlet area of the Black Sea.
Figure 9 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 9. Proportion of soft-shelled foraminifera inhabiting different sediment layers along the depth gradient.
Figure 8 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 8. Proportion of hard-shelled foraminifera inhabiting different sediment layers along the depth gradient.
Figure 7 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 7. Distribution of the Foraminifera (hard-shelled and soft-shelled) abundance (N) along depth gradient at the Bosporus outlet area of the Black Sea.
Figure 6 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 6. Proportion of the Ciliophora inhabiting different sediment layers along the depth gradient at the Bosporus outlet area of the Black Sea.
Figure 1 in Deep - water hypoxic meiobenthic Protozoa and Metazoa taxa of the Istanbul Strait's (Bosporus) outlet area of the Black Sea
Figure 1. Oxygen concentrations in the sediment and the overlying water at Stations 4 –6 (by Sergeeva et al 2013).
Fig. 3 in Rediscovery of a Deep-sea Fish Parasite Lophoura cornuta (Copepoda: Sphyriidae) in the Western North Pacific off Hokkaido, Northern Japan
Fig. 3. Lophoura cornuta, adult female, NSMT-Cr 31508. A, Habitus, ventrolateral view, ethanol-preserved specimen; B, cephalothorax and part of neck including holdfast organ, ventral view; C, D, anterior part of cephalothorax, ventrolateral and dorsolateral views, respectively. The specimen was fixed in 70% ethanol on 24 March 1983 and photographed on 9 October 2023. Abbreviations: c, cephalothorax; cp, conical protuberance; ho, holdfast organ; n, neck. Scale bars: A, 10 mm; B, 3 mm; C, D, 0.5 mm.
Fig. 2 in Rediscovery of a Deep-sea Fish Parasite Lophoura cornuta (Copepoda: Sphyriidae) in the Western North Pacific off Hokkaido, Northern Japan
Fig. 2. Lophoura cornuta, adult female, NSMT-Cr 31509. A, Habitus, ventral view; B, C, cephalothorax and part of neck including holdfast organ, ventral and dorsal views, respectively; D, cephalothorax, anterior view. The trunks on the holdfast organ are individually numbered as 1, 2, 3, or 4 (B, C). Abbreviations: cp: conical protuberance; mo: mouth opening. Scale bars: A, 10 mm; B, C, 5 mm; D, 1 mm.
Fig. 1 in Rediscovery of a Deep-sea Fish Parasite Lophoura cornuta (Copepoda: Sphyriidae) in the Western North Pacific off Hokkaido, Northern Japan
Fig. 1. Collection localities of Lophoura cornuta in the western North Pacific off the south coast of Hokkaido, northern Japan, in the previous (open circle) and present (closed circles) studies. Localities 1, 2, and 3 are: off Cape Ochiishi (type locality; Wilson 1919), off Cape Shirepa (this paper), and off Shin-Hidaka (this paper), respectively.
FIG. 10 in Two new deep-sea species of burrowing anemones (Cnidaria: Actiniaria: Edwardsiidae) from Whittard Canyon off the southwestern coast of Ireland
FIG. 10. Phylogenetic reconstruction from maximum likelihood analysis using focused dataset of 18S sequences for members of Suborder Anenthemonae. Colored lines represent actiniarian suborders; dashed boxes represent Anenthemonae superfamilies. Bootstrap resampling values indicated above branches; only support values>50% are shown.
Figure 11 in A new genus and new species of Desmosomatidae (Crustacea: Isopoda: Asellota) from the deep sea of south-eastern Australia
Figure 11. Disparella kensleyi sp. nov. Holotype female. NMV J18605. (A) Dorsal and (B) lateral views.
Figure 4. Parapseudomma stenurum n in The genus Parapseudomma from the East Atlantic deep sea, with description of a new species (Mysida: Mysidae)
Figure 4. Parapseudomma stenurum n. sp., holotype adult female with BL 24.9 mm (A–E) from the deep sea off Cape Verde Islands and paratype subadult female 14 mm (F) from the Angola Basin. A, B, Masticatory portions of left (A) and right (B) mandibles with pars incisiva (pi), digitus mobilis (dm), spines of the pars centralis (pc) and pars molaris (pm), rostral; C, cuticular ornamentation on parts of the carapace indicated by shaded fields in Fig. 5D; D, distal portion of telson, dorsal; E, antennular bursa, dorsal; F, rostrum with respective portion of carapace, dorsal, dashed line enhances the left anterior margin of the rostrum. A, B, D, structures of the subsequent molt stage visible inside objects.
Figure 1 in The genus Parapseudomma from the East Atlantic deep sea, with description of a new species (Mysida: Mysidae)
Figure 1. Parapseudomma calloplura (Holt and Tattersall, 1905), subadult males with BL 7.8 mm (A, B) and 7.5 mm (C) from the Bay of Biscay. A, B, Subadult in toto, dorsal (A) and ventral (B); C, masticatory portion of right (to the left) and left (to the right) mandible with pars incisiva (pi), digitus mobilis (dm), spines of the pars centralis (pc) and pars molaris (pm), caudal. A, B, object artificially separated from background.
Figure 3.Parapseudomma stenurum n in The genus Parapseudomma from the East Atlantic deep sea, with description of a new species (Mysida: Mysidae)
Figure 3.Parapseudomma stenurum n. sp., holotype adult female with BL 24.9 mm (A, B, E) from the deep sea off Cape Verde Islands, and paratypes subadult female 14 mm (C), immature male 11.2 mm (D, G, H) and adult female 17.1 mm (F) from the Angola Basin. A, Female holotype in toto, lateral (most thoracic endopods broken); B, cephalic region of holotype, dorsal; C, rostrum (ro) and right eye rudiment (re), lateral; D, eye rudiments, dorsal; E, detail of panel (D) showing median eye-cyst in a larger specimen (holotype), dorsal. F, tail fan, dorsal; G, pleopods 3–5 in loco, lateral; H, detail of panel (G) showing tip of pleopod 4. A, two photos mounted together; A, C, objects artificially separated from background.
Figure 6. Parapseudomma stenurum n in The genus Parapseudomma from the East Atlantic deep sea, with description of a new species (Mysida: Mysidae)
Figure 6. Parapseudomma stenurum n. sp., holotype adult female with BL 24.9 mm (A–D, H–K) from the deep sea off Cape Verde Islands and paratype subadult female 14 mm (E–G) from the Angola Basin. A, Thoracopod 1 with epipod, caudal; B, detail of panel (A) showing dactylus 1 with nail, setae omitted; C, thoracic endopod 2 with sympod and part of exopod, rostral; D, detail of panel (C) showing dactylus 2 with nail, setae omitted; E, thoracic endopod 3 with sympod; F, thoracic endopod 6 without basis (sympod); G, detail of panel (F) showing dactylus 6 with nail, setae omitted; H, oostegite 1, inner (= mesial) face, shaded fields stand for areas with minute acute scales; I, pleopod 1, caudal (= mesial) face; J, pleopod 5, rostral (= lateral) face; K, telson.
Figure 2 in The genus Parapseudomma from the East Atlantic deep sea, with description of a new species (Mysida: Mysidae)
Figure 2. Parapseudomma calloplura (Holt and Tattersall, 1905), subadult male with BL 7.8 mm from the Bay of Biscay. A, Eye rudiments, dorsal; B, detail of panel (A) showing serrated portion of anterior margin of right eye rudiment; C, detail of panel (A) showing median eye-cyst; D, thoracic sternite 8 with median process and penis; E, telson.
Figure 5.Parapseudomma stenurum n in The genus Parapseudomma from the East Atlantic deep sea, with description of a new species (Mysida: Mysidae)
Figure 5.Parapseudomma stenurum n. sp., holotype adult female with BL 24.9 mm from the deep sea off Cape Verde Islands. A, Right antennula, dorsal; B, detail of panel (A) showing lobe about mid-dorsally at distal segment of antennular trunk; C, right antenna, dorsal; D, carapace with eye rudiments expanded on slide, dorsal, shaded fields indicate cuticular ornamentation as in Fig. 4C; E, labrum, dorsal (= oral) face; F, left mandible with palp, rostral; G, labium, caudal, left lobe (visualized to the right) damaged; H, maxillula, caudal; I, maxilla, caudal.
Fig. 9 in A new deep-sea species of Halirages Boeck, 1871 (Crustacea: Amphipoda: Calliopiidae) inhabiting sponges
Fig. 9. Phylogenetic analyses of Halirages Boeck, 1871. A. COI. B. 28S. C. COI + 28S (including only individuals for which both genes were available). D. COI + 28S (including all specimens). The depicted topologies are based on the Bayesian inference analysis. Bayesian posterior probabilities and bootstrap support from the Maximum Likelihood analyses are shown for each node.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.