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Variability in the white spot: a new genus and species of Discodorididae (Nudibranchia) from the central and western Pacific Ocean
Donohoo, S.A.; Gosliner, T.M. (2024). Variability in the white spot: a new genus and species of Discodorididae (Nudibranchia) from the central and western Pacific Ocean. J. Moll. Stud. 90(1): eyad027. https://dx.doi.org/10.1093/mollus/eyad027
In: Journal of Molluscan Studies. Oxford University Press: Reading. ISSN 0260-1230; e-ISSN 1464-3766
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| Trefwoorden |
Discodorididae Bergh, 1891 [WoRMS]
Marien/Kust |
| Auteurs | | Top |
- Donohoo, S.A.
- Gosliner, T.M.
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| Abstract |
In this paper, a new genus in the nudibranch family Discodorididae, Avaldesia n. gen., is established for Avaldesia albomacula (Chan & Gosliner, 2007) and Avaldesia tahala (Chan & Gosliner, 2007), originally assigned to the genus Thordisa Bergh, 1877, and a new species, Avaldesia tamatoa n. sp., described here from the central Pacific. To establish species relationships within Avaldesia, as well as the placement of Avaldesia within Discodorididae, we utilized four molecular markers (cytochrome c oxidase subunit I, 16S rRNA, histone H3 and 28S rRNA) in our Bayesian inference and maximum likelihood analyses. Four species delimitation methods were complemented by morphological dissections and scanning electron microscopy. Our results reveal a clear separation between Avaldesia and Thordisa and suggest that Avaldesia is more closely related to the genera Hoplodoris Bergh, 1880 and Asteronotus Ehrenberg, 1831. The most characteristic features of Avaldesia include a radula with increasing denticulation towards the fimbriate outermost laterals and a reproductive system with a lobate vestibular gland, occasional hollow vestibular spine and a penis armed with one or more penial spines. All species of Avaldesia are found in shallow water (5–10 m depth) on rocky reefs, sandy sediments and algal fields with distributions across the Indo-Pacific. |
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