Phyllidia ovata Wägele, Raubold, Papu, Undap & Yonow, 2025

The mantle is elongate oval, white (rarely with a tinge of blue) with a clean-margined oval black area covering the central notum. Anteriorly, this black pigment forms a rounded U-shape around the first midline tubercle placed in front of the rhinophores. Large white conical tubercles have yellow apices in the middle three rows and are only present in the black area. The broad white mantle skirt has smaller white tubercles decreasing in size towards the margin. Yellow rhinophores arise from translucent white rhinophoral sheaths that are distinctly raised; a rhinophoral tubercle with a yellow cap is present. The hyponotum is grey to white, and the foot sole has a black line in the mid-line; the top of the foot is white with no markings. The anus opening is placed ventrally, beautifully illustrated in the literature, with a maximum recorded size of 50 mm.

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References

• Phyllidia sp. 10, Terrence Gosliner, Ángel Valdés and David Behrens. (2018). Nudibranch and Sea Slug Identification Indo-Pacific 2nd Edition. New World Pubns Inc.
• タテヒダイホウミウシ属の1種 3, 小野篤司 & 加藤昌一. (2020). 新版 ウミウシ. 誠文堂新光社.
• Phyllidia ovata sp. nov., Wägele H., Raubold L.M., Papu A., Undap N. & Yonow N. (2025). On two new Phyllidia species (Gastropoda, Nudibranchia, Doridina) and some histology from the Coral Triangle. ZooKeys. 1245: 1-18. https://doi.org/10.3897/zookeys.1245.153046