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56 results for “Donacidae”
Figure 4 in The global freshwater bivalve checklist's extension: Freshwater occurrences and phylogenetic position of Galatea clams from West Africa (Venerida: Donacidae)
Figure 4. Shells of Galatea paradoxa from freshwater section of Niger River, Nigeria (sample RMBH biv1086, Yenagoa). Scale bar = 10 mm. (Photos: Ilya V. Vikhrev).
Figure 3 in The global freshwater bivalve checklist's extension: Freshwater occurrences and phylogenetic position of Galatea clams from West Africa (Venerida: Donacidae)
Figure 3. Shells of Galatea schwabi from Sanaga River, Cameroon. (A-B) Topotypes RMBH biv800, Mouanko (lower reaches, slightly brackish section). (C-D) Specimens RMBH biv801, Monatélé (middle reaches, freshwater section). Red arrows show well-developed muscle attachment scars. Scale bar = 10 mm. (Photos: Artem A. Lyubas).
Figure 5 in The global freshwater bivalve checklist's extension: Freshwater occurrences and phylogenetic position of Galatea clams from West Africa (Venerida: Donacidae)
Figure 5. Maximum likelihood (IQ-TREE) phylogeny of Bivalvia (Venerida and Adapedonta) based on the COI gene sequences (Table 1). A Galatea member is dark red. Scale bar indicates the branch lengths (substitutions per site). Black numbers near nodes indicate the ultrafast bootstrap support (BS) values.
Figure 1 in The global freshwater bivalve checklist's extension: Freshwater occurrences and phylogenetic position of Galatea clams from West Africa (Venerida: Donacidae)
Figure 1. Occurrences of Galatea schwabi (red stars) and Galatea paradoxa (light green stars). The locality data is given in Table 2. Freshwater basins are colored as follows: Sanaga (1), Cross (2), Niger (3), and Volta (4). The red dash indicates the Edea Hydroelectric Power Station's dam on the Sanaga River. (Map: Mikhail Y. Gofarov).
Figure 5 in Sperm ultrastructure in Hemidonax pictus (Hemidonacidae, Bivalvia, Mollusca): comparison with other heterodonts, especially Cardiidae, Donacidae and Crassatelloidea
Figure 5. Ultrastructure (TEM) of spermatozoa of Papyridea semisulcata. A, longitudinal section (LS) showing acrosomal complex, nucleus, midpiece region (tangential, not through centrioles) and emergent flagellum. B, C, LS of acrosomal complex (acrosomal vesicle + subacrosomal deposit) and nuclear apex. Note internal differentiation of basal ring material. D, transverse section (TS) at posterior region (basal ring region) of acrosomal complex. Note layers of differing electron density within basal ring. E, TS of nucleus. F, TS of midpiece showing four mitochondria and proximal centriole (the latter shown in LS profile). Abbreviations: a, acrosomal complex; av, acrosomal vesicle; br, basal ring (of acrosomal vesicle contents); f, flagellum; m, mitochondrion of midpiece; n, nucleus; nl, nuclear lacuna; pc, proximal centriole; pm, plasma membrane; sm, subacrosomal material.
Fig. 2. 60 in Identification and Distribution of Wedge Clams (Donacidae: Bivalvia) in Thailand by Geometric Morphometric and Molecular Analysis.
Fig. 2. 60 Outline digitized landmarks along the inner edge of left valve. Scale bar = 5 mm.
Figure 2 in The global freshwater bivalve checklist's extension: Freshwater occurrences and phylogenetic position of Galatea clams from West Africa (Venerida: Donacidae)
Figure 2. Sanaga River in Cameroon, habitat of Galatea schwabi. (Photo: Jean J. Braun).
Figure 14 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 14. Paphies elongata. An interior view of the fused ventral mantle margin posterior to the pedal gape and showing the rejectory tract. This figure also illustrates the posterior adductor muscle and the visceral ganglia beneath it. AN, anus; AVG, accessory visceral ganglia; FIMF(2), fused inner mantle folds (outer component); IMF(1), inner mantle fold (inner component); IS, inhalant siphon; PA (1), posterior adductor muscle (anterior component); PA(2), posterior adductor muscle (posterior component); PGA, pedal gape; R, rectum; RT, rejectory tract; SN, siphonal nerve; SRM, siphonal retractor muscles; VG, visceral ganglia; VG-AVG-CONN, visceral ganglia-accessory visceral ganglia connective.
Figure 7. Paphies elongata. A in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 7. Paphies elongata. A transverse section through the right ventral mantle margin of the pedal gape. IMF(1), inner mantle fold (inner component); IMF(2), inner mantle fold (outer component); MMF, middle mantle fold; OMF, outer mantle fold; P, periostracum; PN, pallial nerve; PRM, pallial retractor muscle; RT, rejectory tract.
Figure 17 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 17. Paphies elongata. The organs of the pericardium as seen from the right side. AN, anus; AU, auricle; CA, ctenidial axis; DD, digestive diverticulae; G, gonad; GA, gonadial aperture; K, kidney; PA, posterior adductor muscle; PALID, point of attachment of the ascending lamella of the inner demibranch to the visceral mass; PALOD, point of attachment of the ascending lamella of the outer demibranch to the mantle; PG, pericardial gland; PPR, posterior pedal retractor muscle; PR, prodissoconch; R, rectum; RA, renal aperture; R-PA, reno-pericardial aperture; V, ventricle; VM, visceral mass.
Figure 10. Paphies elongata. A in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 10. Paphies elongata. A more detailed view of the ciliary currents of the ctenidium and the ctenidial-labial palp junction, as seen from the right side. AA(1), anterior adductor muscle(1); APR, anterior pedal retractor muscle; CA, ctenidial axis; ID, inner demibranch; ILP, inner labial palp; M, mouth; OD, outer demibranch; OLP, outer labial palp; PA, posterior adductor muscle; PALOD, point of attachment of the ascending lamella of the outer demibranch to the mantle; PPR, posterior pedal retractor muscle; SAE, supra-axial extension of the outer demibranch; VM, visceral mass; VMFG, ventral margin food groove of the inner demibranch.
Figure 6 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 6. Paphies elongata. (a) The siphons as seen from the posterior aspect. More detailed views from the lateral aspect of (b), the inhalant and (c) the exhalant siphons. (d) One of the eight largest inhalant siphonal tentacles shown in greater detail. ES, exhalant siphon; MMF, middle mantle fold; IS, inhalant siphon.
Figure 2 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 2. Paphies elongata. (a) Lateral and (b) posterior views of the left shell valve. Also illustrated in (c) and (d) are the same views of Donax columbella drawn to approximately the same scale. a–b, the dorsoventral axis of the shell; x–y, the greatest shell width; small arrow indicates the position of the umbones; the angles suggest that the posterior face of the shell of P. elongata is slightly more elongate than in D. columbella. L, ligament of D. columbella.
Figure 16 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 16. Paphies elongata. (a) A transverse section through the pedal ganglia showing the position of two putative statocysts. (b) A single putative statocyst illustrated in greater detail. C-P-CONN, cerebro-pleural-visceral ganglia-connective; PEG, pedal ganglia; PEN, pedal nerve; STA, statolith; STC, statocyst.
Figure 12 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 12. Paphies elongata. The ciliary currents of the visceral mass as seen from the left side. AA (1), anterior adductor muscle(1); AA(2), anterior adductor muscle(2); APR, anterior pedal retractor muscle; DEF, dorsal extension of the foot; F, foot; HF, heel of the foot; PA, posterior adductor muscle; PPR, posterior pedal retractor muscle; PR, prodissoconch; PS, pallial sinus; VM, visceral mass.
Figure 8. Paphies elongata. A in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)
Figure 8. Paphies elongata. A transverse section through the fused ventral mantle margin posterior to the pedal gape. FIMF(2), fused inner mantle folds (outer component); FRT, fused rejectory tracts; IMF(1), inner mantle fold (inner component); MMF, middle mantle fold; OMF, outer mantle fold; P, periostracum; PRM, pallial retractor muscle; SC, secretory cells; TC, transverse connective.
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OpenNeuro
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