Phyllidia sp.

Papu, Adelfia, Bogdanov, AleXander, Bara, Robert, Kehraus, Stefan, König, Gabriele M., YonoW, Nathalie & Wägele, Heike, 2022, Phyllidiidae (Nudibranchia, Heterobranchia, Gastropoda): an integrative taxonomic approach including chemical analyses, Organisms Diversity & Evolution (New York, N. Y.) 22 (3), pp. 585-629 : 600

Phyllidia sp. a

The sister taxon of P. ocellata is an undescribed species that we call Phyllidia sp. a (Phsp17Bu1, Fig. 6.1a ). It is a unique specimen, collected from deeper areas in Bunaken Island at 25.3 m (for details see Eisenbarth et al., 2018). It differs from the other Phyllidia species by having only smooth and very low papillate ridges on the notum instead of tubercles. Three white bands lie on the central notum covered by these papillae, the median ridge starting behind the rhinophores along the midline. The mantle margin is yellow-gold. A smooth black band on the lateral notum forms an elongated ring. Gosliner et al. (2008: 300, top right photograph) depicts an individual identified as Phyllidiopsis monacha that looks like our specimen, and we assume that this was erroneously identified as Phyllidiopsis monacha due to its synonymisation with Phyllidiopsis dautzenbergi ( Vayssière, 1912) by Brunckhorst (1993). Phyllidia monacha Yonow (1986) has distinct if tiny tubercles which are absent in our new Phyllidia sp. a, and the central black ring extends as black radiating lines towards the mantle margin in P. monacha . Phylogenetic analysis of the 16S data set revealed a sister-taxa relationship of this new species with P. ocellata , supported by a bootstrap value of 99. Unfortunately, we were not able to retrieve the CO1 sequence of Phyllidia sp. a; however, the species delimitation tests using 16S information clearly render Phyllidia sp. a as a distinct species ( Fig. S1 ).

Figures

Fig. 6 Phyllidia species and specimens with identifiers. Scale bars: 10 mm. 1a Phyllidia sp. a: a Phsp17Bu1. 2a–i Phyllidia varicosa: a Phel15Bu1; b Phva15Bu8; c Phel18Bu6; d Phel18Ko3; e Phva18Po1; f Phva18Ba1; g Phva15Bu2; h Phva16Sa37; i Phva16Sa38

Fig. 1 Sampling locations in Sulawesi, Indonesia