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443 results for “Cephalopod”
Figure 5 in Cephalopods in the potential prey field of sperm whales (Physeter macrocephalus) (Cetacea: Physeteridae) in the northern Gulf of Mexico
Figure 5. Potential cephalopod prey of sperm whales by station (of 1082 individuals with verified identifications).
Figure 1 in Evolution of spermatophore transfer mechanisms in cephalopods
Figure 1. Types of spermatophore attachment in coleoids. (A) Deep implantation (elongated spermatangium; e.g. Architeuthidae, Cranchiidae); (B) deep implantation (bulbous spermatangium; e.g. Octopoteuthidae, Sepiolidae); (C) shallow implantation (e.g. Loliginidae, Ommastrephidae, Enoploteuthidae); (D) plugged attachment (e.g. incirrate octopods). Abbreviations: ft, female tissue; ov, oviducal gland; sp, spermatangium.
Figure 3 in A redescription of the fossil coleoid cephalopod genus Palaeololigo Naef, 1921 (Decapodiformes: Palaeololiginidae) and its relationship to Recent squids
Figure 3. Chtenopteryx sp. Gladius. (Top) right lateral view; (bottom) oblique ventral view. Note: Photo, D.T. Donovan.
Figure 4 in A redescription of the fossil coleoid cephalopod genus Palaeololigo Naef, 1921 (Decapodiformes: Palaeololiginidae) and its relationship to Recent squids
Figure 4. (A) Palaeololigo oblonga (Wagner), holotype. Formerly in Paläontologisches Museum Munich, from Wagner 1860; (B) holotype of Teuthopsis princeps Wagner. Formerly in Paläontologisches Museum Munich, from Wagner 1860; (C) P. oblonga (Wagner), dorsal view of gladius, based mainly on the holotype, restored to original shape, as for illustrations of Recent gladii; (D) P. oblonga (Wagner), left lateral views of gladius, based mainly on the holotype, restored to original shape; (E) P. oblonga (Wagner), gladius of Paläontologisches Museum Munich AS 1968 I 62, natural size; (F) P. oblonga (Wagner), gladius of Jura-Museum, Eichstätt SOS 1325, natural size; (G) Niobrarateuthis walkeri Green, dorsal view of gladius. Upper Cretaceous (Coniacian or Santonian), Kansas, USA. Actual length of specimen about 60 cm, after Green (1977); (H) N. walkeri Green, right lateral view (details as for Fig. 4G).
Figure 6. Molecular time-scale for decapodiform cephalopods indicating a in A redescription of the fossil coleoid cephalopod genus Palaeololigo Naef, 1921 (Decapodiformes: Palaeololiginidae) and its relationship to Recent squids
Figure 6. Molecular time-scale for decapodiform cephalopods indicating a potential position for the Palaeololiginidae and Chtenopteryx on two alternative decapodiform phylogenies (modified from Strugnell et al. [2006]). The topologies result from two alternative Bayesian analyses using: (A) all three codon positions of three nuclear genes (octopine dehydrogenase, rhodopsin, pax-6) partitioned by codon; and (B) only first and second codon positions of the same three nuclear genes. The divergence dates of Palaeololiginidae from Bathyteuthis and Chtenopteryx and also Chtenopteryx from Bathyteuthis are hypothetical. A simplified possible scenario of morphological character loss is depicted. Notes: Ɨ indicates the presence of suckers on the buccal lappets; • indicates the presence of accessory nidamental glands (which is present in Chtenopteryx, but apparently lost in Bathyteuthis); indicates the presence of fused axons in the giant nerve fibre system; ▲ indicates the "juvenile" characters for Oegopsida detailed by Naef (1923), namely the form of gladius with a long narrow rachis, subterminal position of the fins, and also quadriserial suckers on the arms, which Naef (1923) believed to the ancestral form for all Oegopsida; "open" shapes (O, O, Δ, Z)
Figure 2 in A redescription of the fossil coleoid cephalopod genus Palaeololigo Naef, 1921 (Decapodiformes: Palaeololiginidae) and its relationship to Recent squids
Figure 2. Palaeololigo oblonga (Wagner). (A) Paläontologisches Museum Munich AS 1968 I 62. Posterior part to show vane of gladius; (B) Paläontologisches Museum Munich 1964 XXIII 147. Gladius, dorsal view with outline of ink sac; (C) Jura-Museum, Eichstätt SOS 1325. Gladius; (D) Jura-Museum, Eichstätt SOS 1366. Posterior end of gladius and impression of fin; (E) Jura-Museum, Eichstätt SOS 1366. Posterior part of right side of vane. Area where gladius is missing shows clear impression of growth lines and radial folds. Notes: Photos, (A–B) Georg Janssen; (C) Martin Ebert; (D–E) D.T. Donovan.
Figure 1 in A redescription of the fossil coleoid cephalopod genus Palaeololigo Naef, 1921 (Decapodiformes: Palaeololiginidae) and its relationship to Recent squids
Figure 1. Palaeololigo oblonga (Wagner). Paläontologisches Museum Munich AS 1968 I 62. (A) Note that the end of the rachis is broken and bent backwards; (B) detail of arm crown. Note: Photos supplied by Georg Janssen with permission.
Multiple sequence alignments and phylogenetic trees from: Co-option of the limb patterning program in cephalopod eye development
<p>Background</p> <p><span>Across the Metazoa, similar genetic programs are found in the development of analogous, independently evolved, morphological features. The functional significance of this reuse and the underlying mechanisms of co-option remain unclear. Cephalopods have evolved a highly acute visual system with a cup shaped retina and a novel refractive lens in the anterior, important for a number of sophisticated behaviors including predation, mating and camouflage. Almost nothing is known about the molecular-genetics of lens development in the cephalopod.</span></p> <p><span>Results</span></p> <p><span>Here we identify the co-option of the canonical bilaterian limb pattering program during cephalopod lens development, a functionally unrelated structure. We show radial expression of transcription factors <i>SP6-9/sp1, Dlx/dll, </i><i>Pbx/exd, Meis/hth, </i>and a <i>Prdl</i> homolog in the squid <i>Doryteuthis pealeii</i>, similar to expression required in <i>Drosophila</i> limb development.<i> </i>We assess the role of Wnt signaling in the cephalopod lens, a positive regulator in the developing <i>Drosophila </i>limb, and find the regulatory relationship reversed, with ectopic Wnt signaling leading to lens loss. </span></p> <p><span>Conclusion</span></p> <p><span>This regulatory divergence suggests that duplication of SP6-9 in cephalopods may mediate the co-option of the limb patterning program. Thus our study suggests that the limb network could perform a more universal developmental function in radial pattering and highlights how canonical genetic programs are repurposed in novel structures.</span></p>
Cephalopod - Gomphoceras sp.
# SHCMS:G.05436.001 **Gomphoceras sp.** Remains of the Silurian cephalopod Gomphoceras sp. Age: approx 425 million years. Length 8.5cm Width5.5 cm Depth 5cm. Imaged using a canon 5DS R and Stackshot 3x with turntable to provide 108 images which were then processed using agisoft photoscan at high levels. If you like this model or any others we produce we'd love to hear from you and how you've used them. Source: Objaverse 1.0 / Sketchfab
Data from: Marine life in a greenhouse world: cephalopod biodiversity and biogeography during the early Late Cretaceous
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Cephalopod distribution in the Canary Current: Latitudinal and bathymetric patterns
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Data from: Intraspecific variation in cephalopod conchs changes during ontogeny: perspectives from three-dimensional morphometry of Nautilus pompilius
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Data from: Nectocaridid ecology, diversity, and affinity: early origin of a cephalopod-like body plan
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Data from: Synchrotron-X-ray absorption spectroscopy of melanosomes in vertebrates and cephalopods: implications for the affinity of Tullimonstrum
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Data from: New records of the late Pliensbachian to early Toarcian (Early Jurassic) gladius-bearing coleoid cephalopods from the Ya Ha Tinda Lagerstätte, Canada
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Multiple sequence alignments and phylogenetic trees from: Co-option of the limb patterning program in cephalopod eye development
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Data from: Zoogeographic patterns of pelagic oceanic cephalopods along the eastern Pacific Ocean
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Fig. 43. Redpathoceras Flower, 1963 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 43. Redpathoceras Flower, 1963, Kallholn, Boda Limestone. A-C. Redpathoceras magnum sp. nov. A. PMU 26935, holotype; mature truncated body chamber, lateral view. B. Same specimen, view from antispihuncular side. C. PMU 26946, premature truncated phragmocone, lateral view. D-F. Redpathoceras depressum sp. nov. D. PMU 26927, holotype; mature truncated body chamber, lateral view. E. Same specimen, view from antispihuncular side. F. PMU 26931, premature truncated phragmocone, lateral view. Scale bar = 50 mm for all figures.
Fig. 42 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 42. Variation in angle of expansion in Redpathoceras Flower, 1963, Boda Limestone. R. magnum sp. nov. (grey dots); R. bullatum sp. nov. (black dots); R. depressum sp. nov. (black circles).
Fig. 32 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 32. Median cross sections of Discoceras roemeri Strand, 1934, Boda Limestone, Kallholn. A. PMU 26903. B. PMU 26904. Scale bar = 10 mm for both figures.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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