Author: (Chan & Gosliner, 2007)

Order: Nudibranchia  Family: Discodorididae

Maximum Size: 30 mm

Sightings: Sunshine Coast

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Avaldesia albomacula (Chan & Gosliner, 2007)

Previously known on this site as Thordisa albomacula. Transferred to newly raised genus, Avaldesia, by Donohoo & Gosliner, 2024. (Change effected January 2025.)

Mantle colour variable – red-brown, dark-brown or grey but always with lineal white patch just anterior to gill. Mantle margin with interrupted white line. Mantle textured and with scattered filamentous papillae. Gill & rhinophores much lighter in colour.

David A. Mullins – January 2025

References:
– Chan, J. M. & Gosliner, T. M. (2007). Preliminary Phylogeny of Thordisa Nudibranchia: Discodorididae) with Descriptions of Five New Species. The Veliger, 48(4): 284–308.

– Gosliner, T. M., Valde ́s, A ́. & Behrens, D. W. (2018). Nudibranch & Sea Slug Identification – Indo-Pacific, 2nd Edition. New World Publications, Jacksonville, Florida, USA.

– 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. Journal of Molluscan Studies 90: eyad027