File:Juvenile Tridacna costata and squamosa.jpg

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Description
English: 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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Source Own work
Author MerlinCharon

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The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

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Date/TimeThumbnailDimensionsUserComment
current17:32, 23 February 2011Thumbnail for version as of 17:32, 23 February 20119,700 × 5,800 (8.25 MB)MerlinCharon (talk | contribs)some colour corrections and removed some dust...
07:19, 23 February 2011Thumbnail for version as of 07:19, 23 February 20119,700 × 5,800 (8.26 MB)MerlinCharon (talk | contribs){{Information |Description ={{en|1=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 sh

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