Location: Romblon Island
Depth: shallow / medium depth
Cover Photo: Kati Eschweiler
Scientific Name: Costasiella formicaria (Baba, 1959)
Costasiella formicaria can be found on sandy areas at dive sites around Romblon Island. The body of this sea slug is mostly translucent and has some black markings. The cerata can be green to black and often have white spots.
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