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I wrote to to Dr. Juan Lucas Cervera Currado: "My best guess on this one from the Philippines is Ilbiidae sp. Do you know more?"
Here is his reply: "Thank for the photo. Unfortunately, I cannot give more information about this species than you know."
On the taxonomic placement:
Runcinoidea has been recognized as a superfamily within the clade Cephalaspidea, within informal group Opisthobranchia in the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005. They also recognized two families Runcinidae and Ilbiidae.
Malaquias et al. (2009) have reinstated Runcinacea as a valid name outside Cephalaspidea. They also recognized two families Runcinidae (with genus Runcinna) and Ilbiidae, but they did not mention superfamilies.
Jörger et al. 2010 have moved Runcinacea to Euopisthobranchia.
WoRMS has the Family Ilbiidae Burn, 1963 within the Superfamily Runcinoidea H. Adams & A. Adams, 1854 within the order Runcinida Burn, 1963
Bouchet, P. & Rocroi, J.-P. (2005). Classification and nomenclator of gastropod families.
Malacologia. 47 (1-2): 1-397. [20 July]., available online at https://www.biodiversitylibrary.org/page/25127200
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.
Malaquias M. A. E., Dodds J. M., Bouchet P. & Reid D. G. (2009). "A molecular phylogeny of the Cephalaspidea sensu lato (Gastropoda: Euthyneura): Architectibranchia redefined and Runcinacea reinstated".
Zoologica Scripta 38(1): 23-41.
Jörger, Stöger, Kano, Fukuda, Knebelsberger & Schrödl (2010).
"On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia".
BMC Evolutionary Biology 10: 323. online at http://www.biomedcentral.com/1471-2148/10/323
MolluscaBase eds. (2021). MolluscaBase. Ilbiidae Burn, 1963. Accessed through: World Register of Marine Species
at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=411899 on 2021-04-23
This species was posted on 2 June 2011 at these websites as Ilbiidae sp. A Family: Burn, 1963,and changed on 11 September 2011 into
Ilbiidae sp. 01 Family: Burn, 1963.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I had chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
How to cite:
Köhler, E. (2021), published 24 April 2021, Ilbiidae sp. 01 Family: Burn, 1963
available from https://www.Philippine-Sea-Slugs.com/Runcinida/Runcinoidea/Ilbiidae_sp_01.htm