Juvenile Tridacna costata and squamosa
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9700 x 5800 Pixel (8650849 Bytes)
Opis:
Tridacna costata Richter, Roa-Quiaoit, Jantzen, Al-Zibdah, Kochzius, 2008. Juvenile shell, 90 mm.
Old shell, still grayish after cleaning. The lemon yellow shell below is Tridacna squamosa Lamarck, 1819. Juvenile shell, 70 mm without the protruding scales. Acquired around 1977.
This work shows the differences between T. costata and T. squamosa:
The front and backview of T. costata is in the shape of a droplet, widest at the byssal orifice.
The front and backview of T. squamosa is oval shaped and nearly has left-right symmetry.
T. costata has five central ridges, while T. squamosa has four.
Also note that the spacing between the upright scales is smaller for T. costata.
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Creative Commons Zero, Public Domain Dedication
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