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25 results for “tridacna”
Figure 2. Neodendrina carnelia igen. et isp. n in Large dendrinids meet giant clam: the bioerosion trace fossil Neodendrina carnelia igen. et isp. n. in a Tridacna shell from Pleistocene-Holocene coral reef deposits, Red Sea, Egypt
Figure 2. Neodendrina carnelia igen. et isp. n. on the inner side of a Tridacna maxima bivalve shell from the Pleistocene–Holocene coral reef deposits in the Marsa Alam area, Red Sea, Egypt. (a) Inner side of valve (left; prior to sectioning) with hundreds of N. carnelia specimens, and outer surface (right) intensely bioeroded by the sponge boring Entobia isp. (b) Section of the valve (MB.W 5640) with the holotype (centre) and the paratypes (all other specimens) in various ichnogenetic stages. (c) Close-up of the holotype trace. (d–e) Respective micro-CT scan of the holotype in plan and angular views as seen from inside the substrate.
Figure 1 in Large dendrinids meet giant clam: the bioerosion trace fossil Neodendrina carnelia igen. et isp. n. in a Tridacna shell from Pleistocene-Holocene coral reef deposits, Red Sea, Egypt
Figure 1. The Pleistocene raised coral reef limestones exposed at the type locality of Neodendrina carnelia igen. et isp. n. just south of the Carnelia Beach Resort, located between El Quseir and Marsa Alam, exhibiting scleractinian corals as primary reef builders (a) and giant clams Tridacna spp. weathering from the carbonate–siliciclastic rocks (b) that mix with Holocene and modern Tridacna valves, forming a highly time-averaged assemblage (c).
Figure 4. Neodendrina carnelia igen. et isp. n in Large dendrinids meet giant clam: the bioerosion trace fossil Neodendrina carnelia igen. et isp. n. in a Tridacna shell from Pleistocene-Holocene coral reef deposits, Red Sea, Egypt
Figure 4. Neodendrina carnelia igen. et isp. n. on the outer surface of a large recent Tridacna squamosa valve from Nosy-BØ, northern Madagascar (ZMB/Mol 102671). (a) Shell surface with various encrusters as well as bioerosion traces. (b) Close-up of a cluster of N. carnelia. (c) A large specimen with distinct pitted arrays developed in most of the branches.
Figure 3 in Large dendrinids meet giant clam: the bioerosion trace fossil Neodendrina carnelia igen. et isp. n. in a Tridacna shell from Pleistocene-Holocene coral reef deposits, Red Sea, Egypt
Figure 3. SEM images (BSE detector) of Neodendrina carnelia igen. et isp. n. of the inner side of a Tridacna maxima bivalve shell from the Pleistocene–Holocene coral reef deposits in the Marsa Alam area, Red Sea, Egypt. (a–c) Overview and close-ups of the holotype. (d–e) Overview and close-up of an early ichnogenetic stage. (f–g) Overview and close-up of a specimen with authigenic gypsum crystals, calcite spar, and clay minerals within the boring as well as on the host's shell surface. (h) Different morphologies possibly developed in the trace, comprising deep open canals (1), isolated deep pits (2), shallow open canals (3), pits in shallow canals (4) and discontinuities (5). (i) Cross section of a trace showing deep (1) and shallow (2) open canals. (j–k) Overview and detail of an epoxy resin cast of a specimen, illustrating the smooth surface texture and the high degree of microbioerosion in the surrounding (partly mechanically removed to gain a view of the dendrinid).
FIGURE A2 A–B. Tridacna squamosa, C–D in The diversity of molluscan faunas in marine lakes of Raja Ampat, West Papua, Indonesia
FIGURE A2 A–B. Tridacna squamosa, C–D. Cardita pica (L = 25 mm, H = 8.1 mm), E–G. Cardita variegata (L = 33.4 mm, H = 14.5 mm), H-J. Ctena bella (L = 13.4 mm, H = 12 mm), K–M. Brachidontes striatulus. Scale bars: 5 mm. Downloaded from Brill.com 06/21/2024 06:27:04PM via Open Access. This is an open access article distributed under the terms of the CC BY 4.0 license. https://creativecommons.org/licenses/by/4.0/
Fig. 8 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 8. Photos in Chemnitz (1784) referred by Röding (1798) firstly named the giant clam species "noae" (no. 494), "maxima" (no. 495), and Tridacna derasa (no. 497).
Fig. 6 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 6. Shell morphology of Tridacna maxima from Hongchia with prominent rib scales on right valve (A–F) and Tridacna noae from Naliao (G–L). R: rib; S: scale.
Fig. 4 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 4. Neighbour joining tree of Tridacninae using Kimura 2-parameter model based on 18S rRNA gene sequence. Bootstrap values: 1,000; outgroup: Corculum cardissa.
Fig. 2 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 2. Neighbour joining tree of Tridacninae using Kimura 2-parameter model based on Cytochrome c oxidase subunit 1(COI) gene sequence. Bootstrap values: 1,000; outgroup: Corculum cardissa.
Fig. 3 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 3. Neighbour joining tree of Tridacninae using Kimura 2-parameter model based on 16S rRNA gene sequence. Bootstrap values: 1,000; outgroup: Corculum cardissa.
Fig. 5 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 5. Neighbour joining tree of Tridacninae using Kimura 2-parameter model based on 28S rRNA gene sequence. Bootstrap values: 1,000; outgroup: Corculum cardissa.
Fig. 7 in Tridacna noae (Röding, 1798) - a valid giant clam species separated from T. maxima (Röding, 1798) by morphological and genetic data
Fig. 7. Mantle colour pattern and hyaline organs of Tridacna maxima (A, B) and Tridacna noae (C, D). E, Enlarged hyaline organs of T. maxima; F, Enlarged hyaline organs of T. noae. →: Hyaline organs.
Fig. 2 in On the validity of Noah's giant clam Tridacna noae (Röding, 1798) and its synonymy with Ningaloo giant clam Tridacna ningaloo Penny & Willan, 2014
Fig. 2. Tridacna noae (Röding, 1798) on the reef in Coral Bay, Western Australia, 23°09'S 113°47'E, 14 August 2008 (photographed by: Tsun-Thai Chai).
Bivalvo gigante Tridacna gigas
**Ejemplar:** *Tridacna gigas* **Órden**: Veneroida **Familia:** Bivalvia **Localidad:** Océano Índico **Descripción:** se trata de un ejemplar completo con las dos valvas con una longitud máxima de 43 cm y 26 cm de anchura por 25 cm. de altura. De ambiente arrecifales viven junto a corales en aguas cálidas poco profundas y en simbiosis con algas zooxantelas **Sigla museo, colección y entidad:** MUVHN, Colección CCNN Padre Ignacio Sala S.J. (Jesuitas) del Museo de la Universitat de Valencia de Historia Natural **Técnica digitalización / modelo**: escaneado superficial, escáner 3D Einscan Pro (luz estructurada) **Software empleado**: einscan Pro v3.1.0.2 **Parámetros software:** modo manual sin plataforma giratoria, calidad media **Archivo 3D:** Obj 100´3 Mb , textura JPG 4´7 Mb **Autor digitalización:** Jose A. Villena **Cita ejemplar:** modelo 3D colección "Padre Ignacio Sala S.J." del Museo de la Universitat de Valencia de Historia Natural Source: Objaverse 1.0 / Sketchfab
Elevated temperature and carbon dioxide levels alter growth rates and shell composition in the fluted giant clam, Tridacna squamosa
<p>We investigated the effects of 60-d exposure to end-of-the-century projections for seawater temperature (+3 °C) and <em>p</em>CO<sub>2</sub> (+500 µatm) on growth, mineralogy, and organic content of shells and scutes in juvenile <em>Tridacna squamosa </em>clams. The provided excel file contains tables supplying the following raw datasets:</p> <p>(1) Concentrations of trace minerals (Data_Minerals) in shells and scutes</p> <blockquote> <p><strong>IndividualID</strong> - unique ID for each juvenile <em>Tridacna squamosa</em> clam<br> <strong>Type</strong> - type of skeletal material sampled (New: newly-formed, Old: older-growth, Shell: shell, Scute: scute).<br> <strong>Exposure</strong> - experimental treatments (Ambient: ambient seawater conditions, High Temp: elevated temperature alone, High pCO2: elevated <em>p</em>CO<sub>2</sub> alone, Multistressor: elevated temperature and <em>p</em>CO<sub>2</sub> in combination).<br> <strong>SampleMass_mg</strong> - mass (in mg) of powdered skeletal material analyzed.<br> <strong>X_ppb</strong> - concentration (in parts per billion) of element X (Mg: Magnesium, Si: Silica, P: Phosphorus, K: Potassium, Mn: Manganese, As: Arsenic, Sr: Strontium, Ba: Barium, Ca: Calcium) in the sample.<br> <strong>X_mmol_kg-1</strong> - concentration (in mmol kg<sup>-1</sup>) of element X in the sample.<br> <strong>XCaRatio_mmol_mol-1</strong> - ratio of the concentrations of element X (in mmol) and calcium (in mol).<br> <strong>BaCaRatio_µmol_mol-1 </strong>- ratio of the concentrations of barium (in µmol) and calcium (in mol).</p> </blockquote> <p>(2) Morphometric characteristics (Data_Morphometry) of shells/scutes</p> <blockquote> <p><strong>IndividualID</strong> - unique ID for each juvenile <em>Tridacna squamosa</em> clam<br> <strong>Exposure</strong> - experimental treatments (Ambient: ambient seawater conditions, High Temp: elevated temperature alone, High pCO2: elevated <em>p</em>CO<sub>2</sub> alone, Multistressor: elevated temperature and <em>p</em>CO<sub>2</sub> in combination).<br> <strong>X_pre_mm</strong> - measurement value (in millimeters) prior to exposure to experimental treatments (APM: anterior-posterior margin or shell length, DVM: dorsal-ventral margin or shell height, OrnamentationMaxWidth: maximum width of the shell across the scutes, Width: shell width).<br> <strong>X_pre_g</strong> - measurement value (in grams) prior to exposure to experimental treatments (WetMass: whole animal wet mass).<br> <strong>X_post_mm</strong> - measurement value (in millimeters) after 60-d exposure to experimental treatments.<br> <strong>X_post_g</strong> - measurement value (in grams) after 60-d exposure to experimental treatments.<br> <strong>X_gain_mm</strong> - change in measurment value (in millimeters) over the course of the 60-d experiment.<br> <strong>X_gain_%change</strong> - change in measurment value over the course of the 60-d experiment as a percentage of the initial, pre-exposure value (i.e., % change).</p> </blockquote> <p>(3) Organic content (Data_Organics) of shells</p> <blockquote> <p><strong>IndividualID</strong> - unique ID for each juvenile <em>Tridacna squamosa</em> clam<br> <strong>Exposure</strong> - experimental treatments (Ambient: ambient seawater conditions, High Temp: elevated temperature alone, High pCO2: elevated <em>p</em>CO<sub>2</sub> alone, Multistressor: elevated temperature and <em>p</em>CO<sub>2</sub> in combination).<br> <strong>X-newgrowth_weight%</strong> - concentration of element X (Nitrogen, Carbon, or Hydrogen) as a percentage of the weight of sample analyzed in newly-formed shell.<br> <strong>X-oldgrowth_weight% </strong>- concentration of element X as a percentage of the weight of sample analyzed in older-growth shell.</p> </blockquote> <p> </p> <p> </p>
Tridacna maxima (small giant clam) BIRUG 19135
BIRUG 19135 is a recent specimen of *Tridacna maxima*, also known as the 'small giant clam' – a close relative of the true 'giant clam' (*Tridacna gigas*). In life the small giant clam boasts the same bright blue or green mantle as the giant clam, however rarely grows larger than 20cm. This species engages in filter feeding, however gets most of its nutrients through photosynthesis thanks to a symbiotic relationship with photosynthetic algae called zooxanthellae. The colours of the mantle are produced by pigment cells, which may protect the mantle from intense sunlight and/or aid the photosynthesis of symbiotic zooxanthellae. *T. maxima* has a wide geographic range, inhabiting sandy substrates and coral reefs in the southwest and central Pacific, the Indian Ocean, the Red Sea, the southern and eastern coasts of Africa (including Madagascar), and Colombia. This specimen was collected in Australia in 1884 by G. B. Sowerby III. Scanning was performed by Sian Miller using an Artec Spider 3D scanner. Source: Objaverse 1.0 / Sketchfab
Supplementary dataset for the paper "A time window averaging method to mitigate the impact of shell growth trends on Tridacna d18O records".
<p>Data and code for the paper "A time window averaging method to mitigate the impact of shell growth trends on Tridacna δ18O records". We have included an example in the pseudo-Tridacna package v2.1 to demonstrate how users can generate pseudo-Tridacna series.</p>
The shellome of the crocus clam Tridacna crocea emphasizes essential components of mollusc shell biomineralization
<p class="FirstParagraph">Molluscan shells are among the most fascinating research objects because of their diverse morphologies and textures. The formation of these delicate biomineralized structures is a matrix-mediated process. A question that arises is what are the essential components required to build these exoskeletons. In order to understand the molecular mechanisms of molluscan shell formation, it is crucial to identify organic macromolecules in different shells from diverse taxa. In the case of bivalves, however, taxon sampling in previous shell proteomics studies are biased and focus exclusively on representatives of the class Pteriomorphia such as pearl oysters, edible oysters and mussels. In this study, we have characterized the shell organic matrix from the crocus clam, <i>Tridacna crocea</i>, (Heterodonta) using various biochemical techniques, including SDS-PAGE, FT-IR, monosaccharide analysis, and enzyme-linked lectin assay (ELLA). Furthermore, we have identified a number of shell matrix proteins (SMPs) using a comprehensive proteomics approach combined to RNA-seq. The biochemical studies confirmed the presence of proteins, polysaccharides, and sulphates in the <i>T. crocea</i> shell organic matrix. Proteomics analysis revealed that the majority of the <i>T. crocea</i> SMPs are novel and dissimilar to known SMPs identified from the other bivalve species. Meanwhile, the SMP repertoire of the crocus clam also includes proteins with conserved functional domains such as chitin-binding domain, VWA domain, and protease inhibitor domain. We also identified BMSP (Blue Mussel Shell Protein, originally reported from <i>Mytilus</i>), which is widely distributed among molluscan shell matrix proteins. <i>Tridacna</i> SMPs also include low-complexity regions or LCRs that are absent in the other molluscan genomes, indicating that these genes may have evolved in specific lineage. These results highlight the diversity of the organic molecules - in particular proteins - that are essential for molluscan shell formation.</p>
Stable isotope record of the Tridacna shell from the southern South China Sea
<p>Carbon and oxygen stable isotope record of the Tridacna shell from the southern South China Sea between 1989 and 2013.</p>
The shellome of the crocus clam Tridacna crocea emphasizes essential components of mollusc shell biomineralization
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