Agaronia gibbosa explained

Agaronia gibbosa is a species of sea snail, a marine gastropod mollusk in the family Olividae, the olives.

Description

The shell of this species measures 40–75 mm in length.^[1]

The shell is heavy and gibbous, with a notably callous columella, particularly thickened at the upper part. The spire is also robustly thickened. The shell is primarily cream-colored, with the body whorl featuring zigzags and reticulations that range from ash-gray to orange and chocolate. The fasciole is yellowish and maculated with brown. The columella and the interior of the aperture are whitish. ^[2]

Agaronia gibbosa is variable in shape, but large specimens tend to be distinguished from other Agaronia by the large spire callus and bulbous shape (most Agaronia are narrower and rather bullet-shaped).

In its natural state, the shell of Agaronia gibbosa is usually a blotched greenish color with a striped yellow band at the siphonal end, though the species also comes in an all-yellow variety.

This species is common in the shell trade and it is common for the outer layer of the shell to be polished away, revealing a brownish-black color underneath.^[3]

Distribution

Populations of 'this marine species' are found in the Indian Ocean, typically near the shores of the Indian sub-continent, Thailand and Indonesia.^[4]

References

• Melvill, J.C. (1890). Olivancillaria gibbosa (Born). Memoirs and proceedings of the Manchester Literary & Philosophical Society. series 4, 3: 1–26.
• Melvill, J.C. (1904). Note on Oliva gibbosa Born, and its limits of variation. Proceedings of the Malacological Society of London. 6: 64–65.
• Raven J.G.M. (Han) & Recourt P. (2018). Notes on molluscs from NW Borneo. 4. Olivoidea (Gastropoda, Neogastropoda), with the description of eight new species. Vita Malacologica. 17: 113–155.

External links

• Born, I. (1778). Index rerum naturalium Musei Cæsarei Vindobonensis. Pars I.ma. Testacea. Verzeichniß der natürlichen Seltenheiten des k. k. Naturalien Cabinets zu Wien. Erster Theil. Schalthiere. [1–40], 1–458, [1–82]. Vindobonae; (Kraus)
• Gmelin J.F. (1791). Vermes. In: Gmelin J.F. (Ed.) Caroli a Linnaei Systema Naturae per Regna Tria Naturae, Ed. 13. Tome 1(6). G.E. Beer, Lipsiae [Leipzig]. pp. 3021–3910
• Marrat, F. P. 1870-1871. Monograph of the genus Oliva. In: G.B. Sowerby II (ed.), Thesaurus Conchyliorum, vol. 4 (29–30): 1–46 [1871], pl. 328bis–341 [1870], 342–351 [1871]. London, privately published
• Tan S.K. [Siong Kiat], Ng H.E. [Hiong Eng], Chan S.Y. [Sow Yan] & Nguang L.H.S. [Leo H.S.]. (2019). A review of the Recent Agaronia Gray, 1839 (Caenogastropoda: Olividae) of the Sundaic region, with description of a new species. Occasional Molluscan Papers. 7: 1–19

Notes and References

1. Agaronia (Anazola) gibbosa. Hardy's Internet Guide to Marine Gastropods. Retrieved March 18, 2022.
2. http://www.biodiversitylibrary.org/item/77793 Tryon, G. W. (1883). Manual of conchology, structural and systematic, with illustrations of the species, ser. 1., vol. 5: Marginellidae, Olividae, Columbellidae. pp 1-276, pls 1-63. Philadelphia, published by the author.
3. https://olivirv.myspecies.info/en/taxon-pages/utriculina-gibbosa Utriculina gibbosa (Born, 1778)
4. Web site: Ocean Biodiversity Information System.