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533 results for “Cephalopoda”
Fig. 7 in Evolution of the hectocotylus in Sepiolinae (Cephalopoda: Sepiolidae) and description of four new genera
Fig. 7. Schematic drawing of the hectocotylus of Euprymna Steenstrup, 1887. Abbreviations: cop. app. = copulatory apparatus (after Norman & Lu 1997, modified).
Fig. 8 in Evolution of the hectocotylus in Sepiolinae (Cephalopoda: Sepiolidae) and description of four new genera
Fig. 8. Basic types of bursae copulatrices in Sepiolinae Leach, 1817 (highlighted by white frames). A. Closed type, plesiomorphic condition; mated female displaying a bunch of spermatophores inserted in the bursa copulatrix and peeping out its opening (arrow) (Sepiola birostrata Sasaki, 1918). B. Open type, apomorphic condition; virgin female (Sepiola boletzkyi Bello & Salman 2015). Scale bars: 1 mm.
Figure 4 in Ultrastructure of spermatozoa and spermatogenesis in Octopus minor (Sasaki, 1920) (Cephalopoda: Octopoda)
Figure 4. Observation of tail of spermatozoon of Octopus minor under TEM. (A) Longitudinal section of the mitochondria and fibrous sheath at middle piece of tail; (B) transverse section of the mitochondria and fibrous sheath at middle piece of tail; (C) transverse section at principal piece; (D) longitudinal section at principal piece; (E) transverse section of the mitochondria sheath at middle piece of tail; (F–H) different transverse sections at principal piece; (I) transverse section at end piece of tail. CM: chondriosomal mantle; CF: coarse fibre; DT: digitiform tuber; FS: fibrous sheath; M: mitochondria; FSR: fibrous sheath remnant.
Figure 3 in Ultrastructure of spermatozoa and spermatogenesis in Octopus minor (Sasaki, 1920) (Cephalopoda: Octopoda)
Figure 3. Observation of head and neck of spermatozoon of Octopus minor under TEM. (A–B) Longitudinal section of spermatozoon at acrosome and anterior nucleus; (C–D) transverse section of acrosome; (E–G) longitudinal section of spermatozoon at nucleus, endonuclear channel and neck; (H) transverse section of spermatozoon at anterior nucleus; (I) transverse section of posterior nucleus. AV: acrosomal vesicle; AVL: acrosomal vesicle lacuna; PT: protuberance; SAL: sub-acrosomal lacuna; ST: striation; SM: skirt membrane; EC: endonuclear channel; CF: coarse fibre.
Figure 1 in Ultrastructure of spermatozoa and spermatogenesis in Octopus minor (Sasaki, 1920) (Cephalopoda: Octopoda)
Figure 1. Spermatophore and spermatozoa of Octopus minor under the light microscope. (A) Spermatophore; (B) sperm mass; (C) cement body; (D) ejaculatory apparatus; (E) the cap thread; (F) enlarged ejaculatory apparatus and cap thread structure; (G) region of connection of cement body and ejaculatory apparatus; (H) spermatozoon; (I) spermatozoa with entangled flagella.
Figure 11 in Ontogeny of the deep-sea cranchiid squid Teuthowenia pellucida (Cephalopoda: Cranchiidae) from New Zealand waters
Figure 11. Larval cranchiids with similar morphological characteristics. (A) Megalocranchia (ML = 29 mm) with enlarged diagram of (B) the eye viewed anteriorly. (C) Liguriella (ML = 24 mm) with enlarged diagram of (D) the eye viewed laterally. Vertical bar (A, C) = 1 cm, horizontal bar (B, D) = 1 mm.
Figure 7 in Ontogeny of the deep-sea cranchiid squid Teuthowenia pellucida (Cephalopoda: Cranchiidae) from New Zealand waters
Figure 7. Tubercles at the funnel–mantle fusion point in adult Teuthowenia pellucida (three on the exterior and one on the interior mantle surface indicated by arrows).
Figure 5 in Ontogeny of the deep-sea cranchiid squid Teuthowenia pellucida (Cephalopoda: Cranchiidae) from New Zealand waters
Figure 5. Sub-mature adult Teuthowenia pellucida (NIWA 71688, male, ML = 135 mm), (A) ventral and (B) dorsal view. Scale bar = 1 cm.
Figure 3 in Ontogeny of the deep-sea cranchiid squid Teuthowenia pellucida (Cephalopoda: Cranchiidae) from New Zealand waters
Figure 3. Common chromatophore patterns on (A) dorsal and (B) ventral side of stage A larvae of Teuthowenia pellucida.
Figure 2 in Observations on age and reproduction of the oceanic squid Ancistrocheirus lesueurii (d'Orbigny, 1842) (Cephalopoda: Ancistrocheiridae)
Figure 2. Ancistrocheirus lesueurii. (A) Ventral view of the hectocotylus of a mature intersexual male (SAM-S2174, ML 212 mm). A photophore is indicated by the black arrow; (B) the cement body of a spermatophore (from male # 10 in Hoving et al. 2006) with the spermatophore's outer tunic removed.
Figure 1 in Ontogeny of the deep-sea cranchiid squid Teuthowenia pellucida (Cephalopoda: Cranchiidae) from New Zealand waters
Figure 1. Ontogenetic series of Teuthowenia pellucida; dorsal (above) and ventral (below) views. Approximate mantle length range: (A) 1–10 mm; (B) 10–20 mm; (C) 20–28 mm; (D) 28–40 mm; (E) 40–70 mm; (F) 45–100 mm. Scale bar = 1 cm.
Figure 1 in Observations on age and reproduction of the oceanic squid Ancistrocheirus lesueurii (d'Orbigny, 1842) (Cephalopoda: Ancistrocheiridae)
Figure 1. Ancistrocheirus lesueurii. (A) Ventral view of a large female specimen (540 mm ML); (B) dorsal view of the outer collar (oc) and nuchal cartilage (nc) with the anterior mantle and the mantle component of the nuchal cartilage folded backwards; the specimen is oriented with its anterior region towards the bottom of the photograph; (C) lateral view of the left specialized area for spermatangia deposition with sperm and spermatangia indicated by the black arrow (outer collar cut and folded laterally). The inner collar (ic), nuchal cartilage (nc) and mantle component of the nuchal cartilage (mnc) are also indicated.
Figure 5 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 5. Relationship between Doryteuthis plei SL (statolith length, in mm) and ML (mantle length, in mm) for (A) total sample, (B) males, (C) females, (D) immature, (E) maturing and (F) mature. Values of R2 and Akaike Information Citerion for each relationship are available in Table 2.
Figure 3 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 3. Statoliths of Doryteuthis plei at different stages of maturity. (A) Immature, 42 mm ML and 1.04 mm SL; (B) maturing female, 144 mm ML and 1.6 mm SL; (C) mature male, 201 mm ML and 1.59 mm SL; (D) spent female, 159 mm ML and 1.58 mm SL.
Figure 2 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 2. Statoliths of Doryteuthis plei at different sizes, represented from (A) to (P). The first number between brackets indicates the SL (in mm) and the second the respective individual ML (in mm), as follows: A (0.85; 25), B (0.96; 35), C (1.08; 45), D (1.16; 50), E (1.25; 57), F (1.32; 82), G (1.46; 85), H (1.49; 109), I (1.51; 111), J (1.56; 123), K (1.64; 139), L (1.66; 166), M (1.69; 157), N (1.78; 221), O (1.80; 194) and P (1.83; 263).
Figure 1 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 1. Doryteuthis plei statolith measurements. (A) Anterior face: angle of dome (ÂD), dome length (DL); (B) rear face: estimated statolith length (SL), angle of rostrum (ÂR).
Data from: Thorson's rule, life history evolution and diversification of benthic octopuses (Cephalopoda: Octopodoidea)
Here we evaluate the so-called Thorson's rule, which posits that direct-development and larger eggs are favored towards the poles in marine organisms and whose validity been the subject of considerable debate in the literature, combining an expanded phenotypic dataset encompassing 60 species of benthic octopuses with a new molecular phylogeny. Phylogenetic reconstruction shows two clades: clade 1 including species of the families Eledonidae, Megaleledonidae, Bathypolypodidae and Enteroctopodidae, and clade 2 including species of Octopodidae. Egg size, development mode and all environmental variables exhibited phylogenetic signal, partly due to differences between the two clades: whereas most species in clade 1 inhabit cold and deep waters, exhibit large eggs and hatchling with holobenthic development, species from clade 2 inhabit tropical-temperate and shallow waters, evolved small eggs and generally exhibit merobenthic development. Phylogenetic regressions show that egg size exhibits a conspicuous latitudinal cline, and that both egg size and development mode vary with water temperature. Additionally, analyses suggest that egg size is constrained by body size in lineages with holobenthic development. Taken together, results suggest that the variation in egg size and development mode across benthic octopuses is adaptive and associated with water temperature, supporting Thorson's rule in these organisms.
Fig. 4 in Holistic description of new deep sea megafauna (Cephalopoda: Cirrata) using a minimally invasive approach
Fig. 4 Phylogenetic analysis of the Cirrata and other selected Octopodiformes based on the 16S rRNA gene sequence. Scale bar refers to a phylogenetic distance of 0.02 nucleotide substitutions; new species marked in bold font; numbers on the branches denote bootstrap values after 500 replicates
Fig. 1 in Holistic description of new deep sea megafauna (Cephalopoda: Cirrata) using a minimally invasive approach
Fig. 1 Grimpoteuthis imperator sp. nov. ZMB MOLL 240160. a–c Habitus before fixation showing dorsal, ventral, and oral views, anterior facing up. d, e Specimen prior to MRI following several months in 10% formalin solution showing dorsal and ventral views, anterior facing up. Stippled frame denotes the MRI region of interest. f Virtual section through the 3D MRI dataset, anterior facing right. The asterisk denotes a susceptibility artefact in the buccal mass area caused by ingested sediment. g Virtual section through the central long axis of the funnel. h Section of an arm showing the suckers and cirri, right lateral view. i Volume rendering of the viscera, ventral view, anterior facing up. j Close-up of the left gill showing eight broad lamellae. k Volume rendering of the viscera, oblique posterior view
FIGURE 2 in Octopus djinda (Cephalopoda: Octopodidae): a new member of the Octopus vulgaris group from southwest Australia
FIGURE 2. Live Octopus djinda, sp. nov. specimen. Photo, Mark Norman.
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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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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.