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There was some discussion on the correct ending of the specific name:
Micromelo undata, Micromelo undatus or Micromelo undatum
Dr. Richard Willan wrote at the Sea Slug Forum "The name Micromelo is feminine and, because the specific name is an adjective meaning wavy, it must agree with the gender of the genus. So the correct name is Micromelo undata (Bruguiere, 1792)."
I followed Dr. Richard Willan and posted this species at these websites on 11 May 2004 as Micromelo undata (Bruguière, 1792) [Bulla].
According to WoRMS - World Register of Marine Species
is the accepted name Micromelo undatus (Bruguière, 1792).
IPN uses the name Micromelo undatum (Bruguière, 1792) at page 19,
NUDIPIXEL used the name Micromelo undata (Bruguière, 1792), the website NUDIPIXEL is dow, the pictures are gone.
I decided on 10 February 2021 to follow WoRMS, and changed it into Micromelo undatus (Bruguière, 1792) [Bulla]
This species is in older publications placed in the Order Cephalaspidea, according to Bouchet & Rocroi (2005) are
the superfamilies: Acteonoidea and Ringiculoidea no more in the Order Cephalaspidea in the Subclass: OPISTHOBRANCHIA, but
in the new informal group Lower Heterobranchia (= Allogastropoda) Haszprunar, 1985.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). "Classification and nomenclator of gastropod families".
Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1-397.
ISBN 3925919724. ISSN 0076-2997.
More informations on Micromelo undatus as Micromelo undata are at Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2021), published 10 February 2021, Micromelo undatus (Bruguière, 1792)
available from http://www.Philippine-Sea-Slugs.com/Heterobranchia/Micromelo_undatus.htm