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The Lemon Berthellina (Berthellina citrina) is a common ‘side-gilled’ opisthobranch species that is found throughout the waters of the tropical and sub-tropical Indo-West Pacific. It has been found in Africa, the Red Sea, Hawaii, New Caledonia, Papua New Guinea, Japan, New Zealand and Australia. This species can be found during the day hiding under rocks and ledges and is more active at night. The mantle is generally orange however it can also be beige or red in colour. The back of the mantle is covered in small white gland cells that can excrete a milky white substance as a defensive mechanism if disturbed. This species is known to feed on a variety of sponges and corals including Porites sp, Leptastrea sp and Tubastrea coccinea. The Lemon Berthellina (Berthellina citrina) is known to grow to a maximum length of approximately 5cm.
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