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31 results for “Spatangoida”
Figure 7 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 7. Simplified phylogenetic tree showing the different observed characters for each family (after Kroh & Smith, 2010; for a more detailed phylogeny of the Holasteroida, see Smith, 2004; Mironov, Dilman & Krylova, 2013).
Figure 8 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 8. Box plot showing the mean values and ranges of distance between wedges for the atelostomate families studied (the numbers on the vertical axis represent distance between the wedges/width of the wedges); families that show no distance between wedges are not presented (Micrasteridae, Spatangidae, Maretiidae, Palaeotropidae, Eurypatagidae, Plexechinidae, Corystusidae, Urechinidae, Carnarechinidae, and Calymnidae).
Figure 2 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 2. Spine morphology: general (A), spatangoid spine in section (B), and internal structure in a broken spine of Spatangus raschi (C). Abbreviations: br, bridges; cy, cylinder; we, wedge.
Figure 3 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 3. Ornamentation of spines: A, Abatus cordatus (ZMB.Ech 2230_5); B, Breynia australisae (ZMUC-ECH-610); C, Tripylaster philippii (ZMUC-ECH-612); D, Moira atropos (ZMUC-ECH-613); E, Pourtalesia heptneri (ZMUC-ECH-655); F, Paleopneustes cristatus (ZMUC-ECH-113); G, Amphipneustes lorioli (ZMUC-ECH-666); H, Echinosigra phiale (ZMB.Ech 5436_2); I, Rhynobrissus pyramidalis (GZG.INV.78903). Scale bars: (A) 30 μm; (B–F, H) 100 μm; (G, I) 20 μm.
Figure 6 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 6. Perforation of the internal cylinder: A, horizontal arrangement in Ceratophysa rosea (ZMB.Ech-7419); B, helicoidal arrangement in Gymnopatagus magnus (ZMUC-ECH-641). Scale bars: 20 μm.
Figure 5 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 5. Wedge shapes: A, Echinocardium group, Linopneustes fragilis (ZMUC-ECH-643); B, Brissus group, Sternopatagus sibogae (ZMB.Ech-7426); C, Brissus group, Echinocardium mediteraneum (ZMUC-ECH-622); D, Prenaster group, Tripylus excavatus (ZMUC-ECH-637); E, Prenaster group, Plesiozonus diomedeae (ZMUC-ECH-135); F, Prenaster group, Amphipneustes marsupialis (ZMUC-ECH-640). Scale bars: (A, B, D, E) 20 μm; (C) 10 μm; (F) 100 μm.
Figure 4 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 4. Ornamentation of spines: A–D, Echinocardium cordatum (GZG.INV.78890); E–G, Brissus agassizii (GZG.INV.78900); H–J, Holanthus expergitus (ZMUC-ECH-651). Scale bars: (A) 200 μm; (B–D) 40 μm; (E) 1 mm; (F–J) 100 μm.
Figure 1 in Systematic assessment of the Atelostomata (Spatangoida and Holasteroida; irregular echinoids) based on spine microstructure
Figure 1. Test with spines (Brissus latecarinatus, ZMUC-ECH-602): apical side (A), oral side (B). Arrows indicate, approximately, the locations from where spines were generally collected (ap, apical; la, lateral; pl, plastronal). Scale bar: 1 cm.
Figure 3 in A new species of Peribrissus (Echinoidea, Spatangoida) from the middle Miocene of South Australia
Figure 3. Peribrissus janiceae sp. nov. holotype NMV P316528. A–D and F, anterior, right lateral, posterior, adapical and adoral views; E, detail of apical disk; G, oblique left lateral view of semipetalious fasciole crossing interambulacrum 4, plates 7a, 8a, 9a and 9b; H, detail of peristome, labrum and phylodal plates; I, detail of junction between marginal and semipetalous fascioles on interambulacrum 1, plate 4b. Scale bars = 10 mm unless otherwise shown.
Fig. 5 in Rediscovery of an internal organ in heart urchins (Echinoidea: Spatangoida): morphology and evolution of the intestinal caecum
Fig. 5 Occurrence of the intestinal caecum in heart urchins (Echinoidea: Spatangoida). a An intestinal caecum is found only in the Schizasteridae (Spatangoida: Paleopneustina). b Distribution of the intestinal caecum among schizasterids. Both phylogenetic trees show the results of an analysis based on morphological characters (Stockley et al. 2005). The three genera mentioned as incertae sedis were not part of the cited phylogenetic study. Black-framed box genus analyzed in the present study, black square hypothetical evolutionary event, black star intestinal caecum present in all species analyzed, black-framed star intestinal caecum present only in some of the analyzed species, cross fossil taxon, R! loss of structure
Fig. 2 in Rediscovery of an internal organ in heart urchins (Echinoidea: Spatangoida): morphology and evolution of the intestinal caecum
Fig. 2 Gross morphology and histology of the digestive tract of Brisaster. a Schematic frontodorsal view of the digestive tract of B. latifrons, modified after De Ridder et al. (1985). b Oral view of the digestive tract of B. antarcticus. Part of the stomach removed (stippled line) to expose the intestinal caecum. Ambulacrum III facing upwards. c–h Histological sections through the posterior digestive tract of B. latifrons, their approximate locations indicated in (b). c Intestine. d Intestinal caecum. e Vacuoles inside the simple columnar epithelium of the intestinal caecum. f Part of the canal connecting intestinal caecum and intestine. g Mesenterial suspension of the intestinal caecum. h Rectum. Table 2 provides additional specimen information. ae anterior esophagus, bc buccal cavity, ca canal, ct connective tissue, ep epithelium, gc gastric caecum, ic intestinal caecum, in intestine, lu lumen of the digestive tract, me mesentery, nu nucleus, pe posterior esophagus, re rectum, si primary siphon, so somatocoel, va vacuole
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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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.