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20 results for “Loliginidae”
Figure 6 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 6. Comparison between squid statoliths at the same stage of maturity. (A) Doryteuthis plei; (B) Doryteuthis sanpaulensis. The bluish appearance of the D. sanpaulensis statolith is probably due to refractive properties, because it is more transparent than the D. plei statolith.
Figure 4 in Morphology and morphometry of Doryteuthis plei (Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil
Figure 4. Morphometric values of the Doryteuthis plei statoliths into categories (M) males, (F) females, (I) immature, (II) maturing, (III) mature and (IV) spent by statolith measures (SL) statolith length, (DL) dome length, (ÂR) angle of the rostrum and (ÂD) angle of the dome.
Fig. 2 in Doridicola similis (Copepoda: Poecilostomatoida: Rhynchomolgidae) Associated with Sepioteuthis sp. (Cephalopoda: Myopsida: Loliginidae), New to Japan
Fig. 2. Doridicola similis, female (NSMT-Cr 25448). A, mandible; B, maxillule; C, maxilla; D, maxilliped; E, leg 1; F, leg 2; G, leg 3. Scale bars: A, C, D, 50 µm; B, 10 µm; E–G, 100 µm.
Fig. 3. Doridicola similis. A–C in Doridicola similis (Copepoda: Poecilostomatoida: Rhynchomolgidae) Associated with Sepioteuthis sp. (Cephalopoda: Myopsida: Loliginidae), New to Japan
Fig. 3. Doridicola similis. A–C, female (NSMT-Cr 25448): A, leg 4; B, free segment of leg 5; C, posterior surface of genital double-somite and leg 6, dorsal. D–H, male (NSMT-Cr 25449): D, habitus, dorsal; E, antenna; F, maxilliped; G, free segment of leg 5; H, part of genital somite and leg 6, ventral. Scale bars: A–C, 100 µm; D, 500 µm; E, F, 100 µm; G, 50 µm; H, 200 µm.
Figure 5 in Morphological comparison between Doryteuthis pleii and D. sanpaulensis (Cephalopoda, Myopsida, Loliginidae) from Brazil
Figure 5. (A) Female, representing both species, ventral view, mantle opened longitudinally, scale = 20 mm; (B) Doryteuthis pleii female reproductive system, ventral view, scale = 10 mm; (C) Female reproductive system representing both species nidamental gland removed, scale = 10 mm; (D) Doryteuthis sanpaulensis female reproductive system, ventral view, scale = 10 mm.
Figure 1 in Morphological comparison between Doryteuthis pleii and D. sanpaulensis (Cephalopoda, Myopsida, Loliginidae) from Brazil
Figure 1. Doryteuthis pleii general features. (A) Dorsal (left) and ventral (right) whole view of a male, scale = 20 mm; (B) Tentacular club, scale = 5 mm; (C) Upper beak, scale = 2 mm; (D) Sucker from tentacular club, scale = 1 mm; (E) Left ventral arm showing hectocotylized portion, scale = 5 mm.
Figure 3 in Morphological comparison between Doryteuthis pleii and D. sanpaulensis (Cephalopoda, Myopsida, Loliginidae) from Brazil
Figure 3. (A) Central vascular system representing both species, ventral view; (B) Central nervous system representing both species, ventral view. Scales: = 5 mm.
Data from: Lights out: the evolution of bacterial bioluminescence in Loliginidae
Representatives of several metazoan clades engage in symbiotic interactions with bioluminescent bacteria, but the evolution and maintenance of these interactions remain poorly understood. Uroteuthis is a genus of loliginid squid (Cephalopoda: Loliginidae) characterized by paired ventral photophores (light organs) housing bioluminescent bacteria. While previous phylogenetic studies have suggested that Uroteuthis is closely related to Loliolus, a genus of non-bioluminescent species, this relationship remains unresolved. To illuminate Uroteuthis and Loliolus phylogeny and its implications for the evolution of bioluminescence in Loliginidae, we generated sequences from two mitochondrial genes from Uroteuthis specimens sampled from several sites in the Indian and western Pacific Oceans. We combined these data with data from GenBank, analyzed the concatenated data set using maximum likelihood and Bayesian methods, and reconstructed the evolution of bacterial bioluminescence on the resulting phylogenies. Our analyses support the hypothesis that Uroteuthis is paraphyletic with respect to Loliolus. Furthermore, our reconstructions suggest that the symbiosis between loliginid squid and bioluminescent bacteria evolved once in the ancestor of Loliolini (the clade comprising Uroteuthis and Loliolus), but was subsequently lost in the ancestor of Loliolus. These findings could have profound implications for our understanding of the evolution of symbiotic bioluminescence in squid.
Figure 2 in Solitary spawning revealed - an in situ observation of spawning behaviour of Doryteuthis (Amerigo) gahi (d'Orbigny, 1835 in 1834-1847) (Cephalopoda: Loliginidae) in the Falkland Islands
Figure 2. Doryteuthis gahi: (A) before spawning, with egg capsule showing; (B) laying egg capsule; (C) showing habitat where egg mass was laid.
Figure 1. Location map showing study sites, O in Solitary spawning revealed - an in situ observation of spawning behaviour of Doryteuthis (Amerigo) gahi (d'Orbigny, 1835 in 1834-1847) (Cephalopoda: Loliginidae) in the Falkland Islands
Figure 1. Location map showing study sites, O = no egg clusters observed, ⊕ = Doryteuthis gahi egg clusters observed, arrow indicates location of observed D. gahi spawning.
Data from: Lights out: the evolution of bacterial bioluminescence in Loliginidae
Open the record for dataset details and reuse information.
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).
Fig. 1 in Doridicola similis (Copepoda: Poecilostomatoida: Rhynchomolgidae) Associated with Sepioteuthis sp. (Cephalopoda: Myopsida: Loliginidae), New to Japan
Fig. 1. Doridicola similis, female (NSMT-Cr 25448). A, habitus, dorsal; B, urosome, dorsal; C, caudal ramus, dorsal; D, egg sac; E, antennule; F, antenna; G, labrum. Scale bars: A, 500 µm; B, D, 200 µm; C, G, 50 µm; D, E, 100 µm.
Figure 3 in Solitary spawning revealed - an in situ observation of spawning behaviour of Doryteuthis (Amerigo) gahi (d'Orbigny, 1835 in 1834-1847) (Cephalopoda: Loliginidae) in the Falkland Islands
Figure 3. Oceanographic data from the spawning site; average temperature for 1-m depth bands.
Figure 6 in Morphological comparison between Doryteuthis pleii and D. sanpaulensis (Cephalopoda, Myopsida, Loliginidae) from Brazil
Figure 6. (A) Male, representing both species, ventral view, mantle opened longitudinally, scale = 20 mm; (B) Detail of male reproductive system representing both species, ventral view, scale = 10 mm; (C) Male reproductive system isolated, representing both species, ventral view, scale = 10 mm.
Figure 2 in Morphological comparison between Doryteuthis pleii and D. sanpaulensis (Cephalopoda, Myopsida, Loliginidae) from Brazil
Figure 2. Doryteuthis sanpaulensis general features. (A) Dorsal (left) and ventral (right) whole view of a male, scale = 20 mm; (B) Tentacular club, scale = 5 mm; (C) Upper beak, scale = 2 mm; (D) Sucker from tentacular club, scale = 1 mm; (E) Left ventral arm showing hectocotylized portion, scale = 5 mm.
Figure 4 in Morphological comparison between Doryteuthis pleii and D. sanpaulensis (Cephalopoda, Myopsida, Loliginidae) from Brazil
Figure 4. Radulae in SEM: (A) Doryteuthis pleii; (B) Doryteuthis sanpaulensis. Scales: = 200 µm.
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