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69 results for “Pectinidae”
FIGURE 12 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 12. Muscle insertions, microstructures exposed and hydrothermal venting influence on the internal shell surface of specimen 4. A: left valve; A': umbonopallial section; B: right valve; ai: adductor insertion; gsi: gill suspensor insertion; pmi: pallial muscle insertion; pri: pedal retractor insertion; ri: resilium insertion. 1: foliated calcite; 2: aragonitic middle shell layer; 3 to 5: myostracal aragonite, prismatic in adductor myostracum (3) and dorsal pallial muscle insertion (4), spherulitic in pallial line (5); 6: resilium fibrous aragonite.
FIGURE 9 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 9. SEM views of specimens 2 (a,c) and 4 (b, d–f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d).
FIGURE 6 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 6. Ontogeny of right valve anterior auricle and byssal notch. The specimens sp.2 to sp.6 (a) are laid flat. Byssal notch of sp.6 is hidden in (a); in (b) sp.6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole.
FIGURE 3 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 3. Parameters measured on shell of Sinepecten segonzaci n. gen., n. sp. a: view of bivalve shell from the right side; b: sagittal section trough bivalve shell; c: anterior auricle and byssal notch of the right valve. Interior surface of the left valve stippled. Arrow on (b) indicating hinge axis. APD: anteriorposterior diameter; DBN: depth of byssal notch; HAA: height of anterior auricle; LAA: length of anterior auricle: LV left valve; MC: maximal convexity; RV: right valve; TLA: total length of auricles; UPD: umbonopallial diameter (linear height).
FIGURE 8 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 8. Juvenile paratypes of Sinepecten segonzaci. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows).
FIGURE 2 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 2. Morphological characters of juvenile shell (prismatic stage) of Sinepecten segonzaci n. gen., n. sp. External view of left (a) and right (c) valves, with sagittal section (b) through bivalve shell. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus; cr: commarginal ridge; di: disk; lv: left valve; ma: marginal apron; pa: posterior auricle; rv: right valve; u: umbo; A: anterior side; D: dorsal side; P: posterior side; V: ventral side. Arrow on (b) indicating hinge axis.
FIGURE 14 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 14. Biogeographical distribution of species belonging to Bathypecten, Catillopecten and Sinepecten. Stars indicate hydrothermal vent species. 1: B. eucymatus; 2: B. knudseni; 3: B. vulcani; 4: B. micaceus; 5: B. translucens; 6: C. graui; 7: C. murrayi; 8: C. sp.; 9: S. segonzaci.
FIGURE 4 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text).
FIGURE 5 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2–4) and in the largest adult specimen (sp. 6), i.e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve.
FIGURE 7 in A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten
FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp.2.
FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C in Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina
FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084).
FIGURE 2. Aequipecten tehuelchus. A. Left valve. B. Right valve. C in Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina
FIGURE 2. Aequipecten tehuelchus. A. Left valve. B. Right valve. C. Radial rib with scales of LV. D. Detail of scales. E. Anterior auricle and byssal notch of RV. F. Detail of ctenolium. G. Microsculpture of Nepioconch of LR. H. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 50 µm; E= 400 µm; F=100 µm; G=100 µm; H=50 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4085).
FIGURE 1 in Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina
FIGURE 1. Morphological characters of shell. A. Left valve. B. Right valve. Abbreviations: P-1, prodissoconch-1; P-2, prodissoconch-2; AA, anterior auricle; AC, active ctenolium; ADP, connection point of auricle with disc; α, angle; BF, byssal fasciole; BN, byssal notch; BS, byssal sinus; EHP extreme point of the hinge; FMA, free margin of auricle; IR, inter-rib space; PriS, prismatic stage; N, Nepioconch; PN, Post-nepioconch; PA, posterior auricle; R, rib; S, scale.
FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C in Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina
FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086).
Fig. 3 a–m in Impact of habitat and life trait on character evolution of pallial eyes in Pectinidae (Mollusca: bivalvia)
Fig. 3 a–m Median sections of pectinid eyes from the ventral part of the mantle of investigated taxa stained after Masson-Goldner. a– c Aequipecten opercularis: overview of whole section (a), detail of pallial pigment epithelium, cornea and lens (b), detail of distal and proximal retina (c); d–f Pecten maximus, overview of whole section (d), detail of cornea and lens (e), detail of distal and proximal retina (f); g–i
Fig. 4 a-m in Impact of habitat and life trait on character evolution of pallial eyes in Pectinidae (Mollusca: bivalvia)
Fig. 4 a-m Median sections of pectinid eyes from the ventral part of the mantle of investigated taxa stained after Masson-Goldner. a– c Talochlamys pusio, overview of whole section (a), detail of cornea and lens (b), detail of distal and proximal retina (c); d–f Palliolum incomparabile, overview of whole section (d), detail of cornea and lens (e), detail of distal and proximal retina (f); g–i Pseudamussium peslutrae,
Fig. 5 in Impact of habitat and life trait on character evolution of pallial eyes in Pectinidae (Mollusca: bivalvia)
Fig. 5 Cladogram of BEAST analysis of investigated taxa (after Malkowsky and Klussmann-Kolb 2012) and character estimation with BayesTraits for life trait (pie chart) and morphological state changes for eye characters. Diagrams showing cross-sections of reconstructed eye for the discussed taxa (see text). Cf Flat cornea, Cc slightly convex cornea, Csc
Figure 3 in Morphological convergence of shell shape in distantly related scallop species (Mollusca: Pectinidae)
Figure 3. Principal component plot of shell shape variation for specimens used in this study. The first three principal component (PC) axes explain 75.8% of the total variation in shell shape (PC1 = 57.3%; PC2 = 11.6%; PC3 = 6.9%). (A) Shape variation along PC1 and PC2 with photographs of representative individuals for each species. Scale bars = 1 cm. (B) Shape variation along PC1 and PC3. Species are designated as: Amusium pleuronectes (blue squares), 'Amusium' balloti (blue circles), Argopecten irradians (red squares), Argopecten purpuratus (red circles), Chlamys behringiana (green triangles), Caribachlamys sentis (green diamonds), Pseudamussium septemradiatus (white inverted triangles).
Figure 2 in Morphological convergence of shell shape in distantly related scallop species (Mollusca: Pectinidae)
Figure 2. Maximum likelihood estimation of ancestral behaviours using a symmetrical likelihood model (Mk1) on an independently derived multigene Bayesian majority-rule consensus tree. Pie diagrams show character states and their proportion at each node. Taxa highlighted in blue represent long-distance swimming species; taxa in bold represent the seven species examined in our quantitative morphometric analyses of shell shape.
Figure 1 in Morphological convergence of shell shape in distantly related scallop species (Mollusca: Pectinidae)
Figure 1. Three-dimensional surface scan of the left valve of a representative scallop, with the positions of 506 landmarks and semilandmarks indicated. Fixed landmarks are shown as numbered, open circles (Landmark 1: ventroposterior auricle, 2: dorsoposterior auricle, 3: umbo, 4: dorsoanterior auricle, 5: ventroanterior auricle), semilandmarks along the ventral edge of the valve are shown as closed circles, and surface semilandmarks on the scallop valve are shown as grey circles. Dorso-ventral and antero-posterior axes are provided.
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