| Heliacus | |
|---|---|
 | |
| Shell of Heliacus fallaciosus | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Family: | Architectonicidae |
| Genus: | Heliacus d'Orbigny, 1842 |
| Type species | |
| Solarium herbertiDeshayes, 1830 | |
| Synonyms [1] | |
| |
Heliacus is a genus of gastropods belonging to the family Architectonicidae. [1] [2]
(Original description in French) The operculum is corneous and conical, increasing in diameter from the apex to the base; its inner side is smooth with a central point; all the rest is composed of spirally coiled lamellae which decrease in diameter and are always fringed at their circumference. The shell is usually higher than the other sundials, with a narrower umbilicus. [3]
(Described as Gyriscus in Latin) The shell is turbinate, conico-turreted, and umbilicate; the apex is blunt, with the tip involuted; the whorls are rounded and transversely girdled; the aperture is subcircular, with the margins sharp and joined by a callus, the columellar lip being reflected. The operculum is corneous (horny), multispiral on the upper part, and provided with a stylet-like process on the lower part. [4]
The Heliacus species are typically found in warm-temperate to tropical waters globally, from the intertidal zone down to the subtidal and occasionally deeper. [2]
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