| Maxima clam | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Mollusca | 
 
| Class: | Bivalvia | 
 
| Order: | Cardiida | 
 
| Family: | Cardiidae | 
 
| Subfamily: | Tridacninae | 
 
| Genus: | Tridacna | 
| Species: | T. maxima | 
| Binomial name | 
| Tridacna maxima 
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| Synonyms | 
| Tridachnes maxima Röding, 1798 (original combination)Tridacna (Chametrachea) maxima (Röding, 1798) · alternate representationTridacna acuticostata G. B. Sowerby III, 1912Tridacna compressa Reeve, 1862  junior subjective synonymTridacna detruncata Bianconi, 1869 junior subjective synonymTridacna elongata Lamarck, 1819 junior subjective synonymTridacna fossor Hedley, 1921Tridacna imbricata (Röding, 1798)Tridacna lanceolata G. B. Sowerby II, 1884 junior subjective synonymTridacna maxima var. fossor Hedley, 1921 junior subjective synonymTridacna mutica Lamarck, 1819  (synonym - pars)Tridacna reevei Hidalgo, 1903 junior subjective synonymTridacna rudis Reeve, 1862 junior subjective synonymTridacna troughtoni Iredale, 1927 junior subjective synonym
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The maxima clam (Tridacna maxima), also known as the small giant clam, is a species of bivalve mollusc found throughout the Indo-Pacific region.
They are much sought after in the aquarium trade, as their often striking coloration mimics that of the true giant clam; however, the maximas maintain a manageable size, with the shells of large specimens typically not exceeding 20 centimetres (7.9 in) in length.