Heliacus fallaciosus

Heliacus fallaciosus (Tiberi, 1872)

• Solarium fallaciosum Tiberi, 1872
• Ammonicerina mutabilis O. G. Costa, 1861
• Heliacus (Grandeliacus) fallaciosus (Tiberi, 1872)
• Heliacus subvariegatus (d’Orbigny, 1852)
• Solarium spencerii Allen, 1856
• Solarium stramineum (Gmelin, 1791) sensu Philippi, 1836
• Solarium stramineum var. mediterranea Philippi, 1853

Description
Disciform shell, yellowish brown in color and lentil-shaped, about 15 to 20 mm. maximum diameter. Shell surface with 3 granular cords arranged in a spiral, and with growth striae. With very deep umbilicus and prominent in the back side. Rounded stoma. The fossil form is known as Solarium obtusum, but there are no morphological differences with the current form.

Biology
It feeds on cnidarians, of which it is considered an ectoparasite. It is considered rare.

Etymology

• Heliacus, Latinized form of Greek hēliakos, “of the Sun”.
• Fallaciosus, from the Latin fallacia “deception, trick, artifice” and the ending “-osus” meaning “related to, having to do with”.

Distribution
It is found on sandy or rocky circalittoral bottoms of the Atlantic and Mediterranean.

Known georeferenced records of the species: Heliacus fallaciosus

Sources:
OBIS GROC 2010-2011 Enric Madrenas João Pedro Silva Bernard Picton GBIF	OPK VIMAR Manuel Ballesteros M@re Nostrum Altres fonts Marine Regions

[abundanci medocc=0 medori=0 oceatl=0]

More pictures

Heliacus fallaciosus @ Eivissa, Spain May, 2022

Heliacus fallaciosus @ Eivissa, Spain May, 2022

Heliacus fallaciosus @ Eivissa, Spain May, 2022

Bibliography

1246567 Heliacus fallaciosus 1 eunomia-revista-en-cultura-de-la-legalidad 50 creator asc 1 34204 https://opistobranquis.info/wp-content/plugins/zotpress/
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Templado, J., Villanueva, R. (2010). Checklist of Phylum Mollusca. pp. 148-198 In Coll, M., et al., 2010. The biodiversity of the Mediterranean Sea: estimates, patterns, and threats. PLoS ONE 5(8):36pp.
Tiberi, N. (1872). Generi e specie della Fam. Solariidae, viventi nel Mediterraneo e fossili nel terreno pliocenico italiano. Bullettino Malacologico Italiano, 5, 31-48.
Bibliography based on the works by Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 and Gary McDonald, 2009. Bibliographia Nudibranchia, with later updates from other resources.

Further reading

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