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46 results for “Pectinoidea”
Fig. 35 in The family Pectinidae in South Africa and Mozambique (Mollusca: Bivalvia: Pectinoidea)
Fig. 35. Semipallium tigris (Lamarck, 1819): NMSA D7518, off Boteler Point, Zululand, 78 m, 50.4 x 44.8 mm, RV exterior.
Figs 5–6 in The family Pectinidae in South Africa and Mozambique (Mollusca: Bivalvia: Pectinoidea)
Figs 5–6. Pseudamussium gilchristi (Sowerby, 1904): NMSA E3100, Agulhas Bank, 200 m, pv, 30.8 x 31.1 mm. 5. LV exterior. 6. RV exterior.
Fig. 8 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 8. Cyclochlamys bacachorda sp. n., holotype: South Africa, off Nthlonyane River, (A) external view of the left valve, H = 3 mm, scale bar = 1 mm; (B) external view of the right valve, H =, scale bar = 1 mm; (D) prodissoconch of the left valve, H = 3 mm, scale bar = 0.1 mm; (E) details of the left valve, H = 3 mm, scale bar = 0.1 mm; (F) details of the right valve, H = 3 mm, scale bar = 0.1 mm (NMSA E55/T4029); paratype, (C) external view of the right valve, H = 2.2 mm, scale bar = 0.5 mm (NMSA P0325/T4030). (G–H) Similipecten eous (Melvill in Melvill & Standen, 1907): campaign Mainbaza, stn CP3132, (H) external view of a left valve, H = 2.6 mm, scale bar = 1 mm; (H) details of a left valve, H = 2.6 mm, scale bar = 0.1 mm (MNHN).
Fig. 6 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 6. Cyclopecten spp.: (A–G) C. cassiculus sp. n., holotype: campaign Miriky, stn CP3248, (A) external view of the left valve, H = 8.5 mm, scale bar = 2 mm; (B) internal view of the left valve, H = 8.5 mm, scale bar = 2 mm; (C) external view of the right valve, H = 7 mm, scale bar = 2 mm; (D) internal view of the right valve, H = 7 mm, scale bar = 2 mm; (E) prodissoconch of the left valve, H = 8.5 mm, scale bar = 0.1 mm; (F) details of the left valve, H = 8.5 mm, scale bar = 0.1 mm; (G) details of the right valve, H = 7 mm, scale bar = 0.1 mm (MNHN 41951). (H, I) C. horridus Dijkstra, 1995: South Africa, Transkei, off Whale Rock, (H) external view of the left valve, H = 3.3 mm, scale bar = 1 mm; (I) details of the left valve, H = 3.3 mm, scale bar = 0.1 mm (NMSA E65).
Fig. 7 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 7 (A–J). Cyclopecten spp.: (A–G) C. kantori sp. n., holotype: campaign Miriky, stn CP3241, (A) external view of the left valve, H = 11.3 mm, scale bar = 2 mm; (B) internal view of the left valve, H = 11.3 mm, scale bar = 2 mm; (C) external view of the right valve, H = 9.8 mm, scale bar = 2 mm; (D) internal view of the right valve, H = 9.8 mm, scale bar = 2 mm; (E) prodissoconch of the left valve, H = 11.3 mm, scale bar = 0.2 mm; (F) details of the left valve, H = 11.3 mm, scale bar = 0.1 mm; (G) details of the right valve, H = 9.8 mm, scale bar = 0.2 mm (MNHN 38440). (H–J) C. kapalae Dijkstra, 1990: campaign Mainbaza, stn CC3166, (H) external view of the left valve, H = 5.6 mm, scale bar = 2 mm; (I) external view of the right valve, H = 4.9 mm, scale bar = 2 mm; (J) details of the left valve, H = 5.6 mm, scale bar = 0.1 mm (MNHN).
Fig. 5 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 5. Parvamussium spp.: (A–C) P. torresi (E.A. Smith, 1885): campaign Mainbaza, stn CP3143, (A) external view of the left valve, H = 7.8 mm, scale bar = 2 mm; (B) external view of the right valve, H = 6.6 mm, scale bar = 2 mm; (C) details of the left valve, H = 7.8 mm, scale bar = 0.1 mm (MNHN). (D–F) P. texturatum (Dautzenberg & Bavay, 1912): campaign Mainbaza, stn CC3151, (D) external view of the left valve, H = 5.7 mm, scale bar 2 mm; (E) external view of the right valve, H = 5.7 mm, scale bar 2 mm; (F) details of the left valve, H = 5.7 mm, scale bar 0.1 mm (MNHN). (G–I) P. vesiculatum Dijkstra, 1995: campaign Miriky, stn DW3196, (G) external view of a left valve (typical), H = 6.6 mm, scale bar = 0.2 mm; (H) external view of a left valve (atypical), H = 7 mm, scale bar = 0.2 mm; (I) details of the left valve (typical), scale bar = 0.1 mm (MNHN). (J–L) P. thyrideum (Melvill in Melvill & Standen, 1907): expedition Atimo Vatae, stn DW3523, (J) external view of one left valve, H = 5.2 mm, scale bar = 1 mm (K) external view of one right valve, H = 3.1 mm, scale bar = 1 mm;; (L) details of the left valve, H = 5.2 mm, scale bar = 0.1 mm (MNHN). (M) P. vidalense (Barnard, 1964), holotype: South Africa, KwaZulu-Natal, off Cape Vidal, external view of the left valve, H = 7.3 mm, scale bar = 2 mm (SAM A9495).
Fig. 4 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 4. Parvamussium spp.: (A–C) P. scitulum (E.A. Smith, 1885): campaign Mainbaza, stn CP3130, (A) external view of the left valve, H = 6.2 mm, scale bar = 2 mm; (B) external view of the right valve, H = 5.7 mm, scale bar = 2 mm; (C) details of the left valve, H = 6.2 mm, scale bar = 0.1 mm (MNHN). (D–F) P. siebenrocki (Sturany, 1901): campaign Mainbaza, stn CC3160, (D) external view of the left valve, H = 6.9 mm, scale bar = 2 mm; (E) external view of the right valve, H = 5.9 mm, scale bar = 2 mm; (F) details of the left valve, H = 6.9 mm, scale bar = 0.1 mm (MNHN). (G–M) P. strongae sp. n., holotype: campaign Miriky, stn DW3212, (G) external view of the left valve, H = 21.9 mm, scale bar = 1 cm; (H) internal view of the left valve, H = 21.9 mm, scale bar = 1 cm; (I) external view of the right valve, H = 17.4 mm, scale bar = 1 cm; (J) internal view of the right valve, H = 17.4 mm, scale bar = 1 cm; (K) prodissoconch of the left valve, H = 21.9 mm, scale bar = 0.2 mm; (L) details of the left valve, H = 21.9 mm, scale bar = 0.1 mm; (M) details of the right valve, H = 17.4 mm, scale bar = 0.1 mm (MNHN 39087).
Fig. 3 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 3. Parvamussium spp.: (A, B, J, K) P. formosum (Melvill in Melvill & Standen, 1907): campaign Miriky, stn CP3228, (A) external view of the left valve, H = 9 mm, scale bar = 2 mm; (B) external view of the right valve, H = 7.8 mm, scale bar = 2 mm; (J) details of the left valve, campaign Miriky, stn CP3228, H = 9 mm, scale bar = 0.1 mm; (K) details of the right valve, H = 7.8 mm, scale bar = 0.1 mm (MNHN). (C–I) P. kilburni sp. n., holotype: N. Zululand, off Dog Point, (C) external view of the left valve, H = 10.5 mm, scale bar = 2 mm; (D) external view of the right valve, H = 9.1 mm, scale bar = 2 mm; (E) internal view of the left valve, H = 10.5 mm, scale bar = 2 mm; (F) internal view of the right valve, H = 9.1 mm, scale bar = 2 mm; (G) prodissoconch of the left valve, H = 10.5 mm, scale bar = 0.2 mm; (H) details of the left valve, H = 10.5 mm, scale bar = 0.1 mm; (I) details of the right valve, N. Zululand, off Dog Point, H = 10.5 mm, scale bar = 0.1 mm (NMSA D7689).
Fig. 2 in Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean
Fig. 2. Parvamussium spp.: (A–G) P. catillus sp. n., holotype: campaign Mainbaza, stn CP3139, (A) external view of the left valve, H = 7.2 mm, scale bar = 2 mm; (B) internal view of the left valve, H = 7.2 mm, scale bar = 2 mm; (C) external view of the right valve, H = 7.2 mm, scale bar = 2 mm; (D) internal view of the right valve, H = 7.2 mm, scale bar = 2 mm; (E) details of the left valve, H = 7.2 mm, scale bar = 0.1 mm; (F) details of the right valve, H = 7.2 mm, scale bar = 0.1 mm; (G) prodissoconch of the left valve, H = 7.2 mm, scale bar = 0.2 mm (MNHN 41966). (H–N) P. puillandrei sp. n., holotype: campaign Miriky, stn DW3200, (H) external view of the left valve, H = 12.4 mm, scale bar = 0.2 mm; (I) internal view of the left valve, H = 12.4 mm, scale bar = 0.2 mm; (J) external view of the right valve, H = 10 mm, scale bar = 0.2 mm; (K) internal view of the right valve, H = 10 mm, scale bar = 0.2 mm; (L) prodissoconch of the left valve, H = 12.4 mm, scale bar = 0.2 mm; (M) details of the right valve, H = 10 mm, scale bar = 0.1 mm; (N) details of the left valve, H = 10 mm, scale bar = 0.1 mm (MNHN 39021).
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).
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