(Original description by Paul Bartsch) The size of the shell varies between 10 mm and 20 mm. The shell has a regularly conic shape. It is flesh colored, with squarish maculations of chestnut brown, the latter occupy a zone extending from the periphery to the middle of the whorl, and are separated from each other by a space about equal to the width of the brown spots. On the base, the spiral cords are dotted with maculations of the same color. There are at least two nuclear whorls, apparently smooth. The postnuclear whorls are marked by spiral cords and axial riblets forming tubercles at their junction, thus lending the spiral cords a granulated appearance. Of these cords, 3 occur upon the first, 4 upon the second, 7 upon the third, 8 upon the fourth, and 10 upon the penultimate turn between the periphery and the summit. These spiral cords are separated on all but the body whorl by spaces about equal to the cords in width. On the last turn, however, the sulci are broader and the tuberculated cords are less regular than on the preceding turns. The sutures are slightly constricted. The periphery of the body whorl is decidedly angulated, and marked by a broad spiral cord. The base of the shell is short, slightly rounded, and marked by 14 somewhat flattened spiral cords of somewhat irregular width, increasing slightly in width from the periphery to the umbilical area. The spaces that separate them are also of somewhat irregular width, but in general are almost as wide as the cord. In addition to the spiral sculpture, the base is marked by numerous coarse lines of growth which cut the cords but do not render them tuberculated. The aperture is subcircular. The posterior angle is obtuse;. The outer lip is thin. The columella is strongly curved and reflected over the base as a slight callus at the umbilical area.[2]
Distributionedit
This species occurs off Jeffrey's Bay - North Transkei, South Africa.
^Paul Bartsch (1915) REPORT ON THE TURTON COLLECTION OF SOUTH AFRICAN MARINE MOLLUSKS, WITH ADDITIONAL NOTES ON OTHER SOUTH AFRICAN SHELLS CONTAINED IN THE UNITED STATES NATIONAL MUSEUM (described as Calliostoma africana)
Kilburn, R.N. (1974) Taxonomic notes on South African marine Mollusca (3): Gastropoda: Prosobranchia, with descriptions of new taxa of Naticidae, Fasciolariidae, Magilidae, Volutomitridae and Turridae. Annals of the Natal Museum, 22, 187–220.
Branch, G.M. et al. (2002). Two Oceans. 5th impression. David Philip, Cate Town & Johannesburg
External linksedit
"Calliostoma (Calliostoma) africanum". Gastropods.com. Retrieved 15 January 2019.
Wikimedia Commons has media related to Calliostoma africanum.
January 01, 1970
calliostoma, africanum, species, snail, marine, gastropod, mollusk, family, calliostomatidae, original, drawing, with, apertural, view, shell, scientific, classification, domain, eukaryota, kingdom, animalia, phylum, mollusca, class, gastropoda, subclass, veti. Calliostoma africanum is a species of sea snail a marine gastropod mollusk in the family Calliostomatidae 1 Calliostoma africanum Original drawing with an apertural view of a shell of Calliostoma africanum Scientific classification Domain Eukaryota Kingdom Animalia Phylum Mollusca Class Gastropoda Subclass Vetigastropoda Order Trochida Superfamily Trochoidea Family Calliostomatidae Genus Calliostoma Species C africanum Binomial name Calliostoma africanumBartsch 1915 Synonyms 1 Calliostoma africana Bartsch 1915 original description Calliostoma convexa Turton 1932 Calliostoma Calliostoma africanum Bartsch P 1915 Contents 1 Description 2 Distribution 3 References 4 External linksDescription edit Original description by Paul Bartsch The size of the shell varies between 10 mm and 20 mm The shell has a regularly conic shape It is flesh colored with squarish maculations of chestnut brown the latter occupy a zone extending from the periphery to the middle of the whorl and are separated from each other by a space about equal to the width of the brown spots On the base the spiral cords are dotted with maculations of the same color There are at least two nuclear whorls apparently smooth The postnuclear whorls are marked by spiral cords and axial riblets forming tubercles at their junction thus lending the spiral cords a granulated appearance Of these cords 3 occur upon the first 4 upon the second 7 upon the third 8 upon the fourth and 10 upon the penultimate turn between the periphery and the summit These spiral cords are separated on all but the body whorl by spaces about equal to the cords in width On the last turn however the sulci are broader and the tuberculated cords are less regular than on the preceding turns The sutures are slightly constricted The periphery of the body whorl is decidedly angulated and marked by a broad spiral cord The base of the shell is short slightly rounded and marked by 14 somewhat flattened spiral cords of somewhat irregular width increasing slightly in width from the periphery to the umbilical area The spaces that separate them are also of somewhat irregular width but in general are almost as wide as the cord In addition to the spiral sculpture the base is marked by numerous coarse lines of growth which cut the cords but do not render them tuberculated The aperture is subcircular The posterior angle is obtuse The outer lip is thin The columella is strongly curved and reflected over the base as a slight callus at the umbilical area 2 Distribution editThis species occurs off Jeffrey s Bay North Transkei South Africa References edit a b Calliostoma africanum Bartsch 1915 Retrieved through World Register of Marine Species Paul Bartsch 1915 REPORT ON THE TURTON COLLECTION OF SOUTH AFRICAN MARINE MOLLUSKS WITH ADDITIONAL NOTES ON OTHER SOUTH AFRICAN SHELLS CONTAINED IN THE UNITED STATES NATIONAL MUSEUM described as Calliostoma africana Kilburn R N 1974 Taxonomic notes on South African marine Mollusca 3 Gastropoda Prosobranchia with descriptions of new taxa of Naticidae Fasciolariidae Magilidae Volutomitridae and Turridae Annals of the Natal Museum 22 187 220 Branch G M et al 2002 Two Oceans 5th impression David Philip Cate Town amp JohannesburgExternal links edit Calliostoma Calliostoma africanum Gastropods com Retrieved 15 January 2019 nbsp Wikimedia Commons has media related to Calliostoma africanum Retrieved from https en wikipedia org w index php title Calliostoma africanum amp oldid 1178925662, wikipedia, wiki, book, books, library,
