Heliacus
Heliacus is a genus of gastropods belonging to the family Architectonicidae.
General characteristics
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.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, multispiral on the upper part, and provided with a stylet-like process on the lower part.
Distribution
The Heliacus species are typically found in warm-temperate to tropical waters globally, from the intertidal zone down to the subtidal and occasionally deeper.Species
- † Heliacus albertinae
- Heliacus anaglyptus
- † Heliacus angularis Makiyama, 1927
- † Heliacus antu S. N. Nielsen & Frassinetti, 2007
- Heliacus areola
- Heliacus asteleformis
- † Heliacus bahamondei Frassinetti & Covacevich, 1981
- †Heliacus berthae
- Heliacus bisulcatus
- Heliacus caelatus
- Heliacus cerdaleus
- † Heliacus chonos S. N. Nielsen & Frassinetti, 2007
- Heliacus corallinus
- Heliacus costatus
- Heliacus cylindricus
- † Heliacus darraghi
- † Heliacus deningeri
- Heliacus discoideus
- Heliacus enoshimensis
- Heliacus fallaciosus
- Heliacus fenestratus
- Heliacus geminus
- † Heliacus globosus Harzhauser & Landau, 2023
- Heliacus hyperionis
- Heliacus imperfectus
- Heliacus implexus
- Heliacus infundibuliformis
- Heliacus jeffreysianus
- † Heliacus lowei Durham, 1950
- Heliacus madurensis
- Heliacus malani
- Heliacus mazatlanicus
- Heliacus mighelsi
- Heliacus miser
- † Heliacus morningtonensis Garrard, 1978
- Heliacus nereidis
- Heliacus oceanitis
- † Heliacus otwayanus Garrard, 1978
- Heliacus otwayanus
- Heliacus planispira
- Heliacus ponderi
- Heliacus proteus
- † Heliacus radiatus
- † Heliacus reticulatus Dockery, 1993
- † Heliacus robertsae Durham, 1950
- Heliacus reticulatus
- Heliacus rotula
- † Heliacus stefanmeszarosi Biskupič, 2024
- Heliacus sterkii
- Heliacus stramineus
- † Heliacus taverai
- Heliacus trochoides
- Heliacus turritus
- Heliacus variegatus
- Heliacus verdensis
- Heliacus virgatus
- † Heliacus wannonensis
- Heliacus willianseverii
- ''Heliacus worsfoldi''