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14 results for “Sinepecten”
FIGURE 13 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 13. Pattern of byssal notch morphogenesis in extant Pectinids displaying different mode of life (not to scale). 1–3: first successive ontogenetic stages exemplified by juveniles of Pecten maximus (1: postlarval; 2: without ctenolium; 3: with ctenolium); a–g: adults, byssally fixed (a–d), freeliving (f–g), or both (e); ct: ctenolium; P: prodissoconch. a: Bathypecten vulcani; b: Sinepecten segonzaci; c: Hemipecten forbesianus; d: Chlamys varia; e: Aequipecten opercularis; f: Pecten maximus; g: Propeamussium watsoni. Thick black arrows indicate ontogenetic trajectories. Thin arrows outline the main growth allometries (parallel to commissure plan only) around byssal notch. For (b), crosses indicate place of byssal notch covered by its ventral edge and thus invisible (see Figure 6). Black anterior auricle of (f) corresponds to stage 3.
FIGURE 11 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 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction.
FIGURE 10 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 10. Coiling of dorsal edge of anterior auricle and of outer ligament insertion. Left: interior view of right valve anterior auricle (not exactly to scale: height of outer ligament insertion oversized). Right: proximal (A) and distal (B) sections of bivalve shell through anterior auricle. aa: anterior auricle; bn: byssal notch; h: hinge; lv: left valve; oli: outer ligament insertion; ri: resilium insertion (inner ligament); rv: right valve.
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 1 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 1. Location of Manus hydrothermal vent area.
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