''Agathistoma fasciatum'' (known commonly as the Smooth Atlantic Tegula) is a
species
In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...
of
sea snail, a marine
gastropod mollusk
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is es ...
in the
family
Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
Tegulidae
Tegulidae is a family of small to large sea snails, marine gastropod mollusks in the superfamily Trochoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Bouchet, P. (2013). Tegulidae Kuroda, Habe & Oyama, 1971. Acce ...
.
Description
''A. fasciatum'' is slightly smaller than ''
T. lividomaculata'', which is high, and somewhat wider than that.
Its thick, solid shell is depressed and is umbilicate. The six
whorl
A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).
Whorls in nature
File:Photograph and axial plane flo ...
s are smooth, convex and rounded. The
apex
The apex is the highest point of something. The word may also refer to:
Arts and media Fictional entities
* Apex (comics), a teenaged super villainess in the Marvel Universe
* Ape-X, a super-intelligent ape in the Squadron Supreme universe
*Apex, ...
is acute. The upper whorls are nearly flat, the last flattened beneath the
suture. The base of the shell is rounded, concave around the
umbilicus
Umbilicus may refer to:
*The navel or belly button
*Umbilicus (mollusc), a feature of gastropod, Nautilus and Ammonite shell anatomy
* ''Umbilicus'' (plant), a genus of over ninety species of perennial flowering plants
*Umbilicus urbis Romae
The ...
. The
aperture
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
An ...
is oblique. The outer
lip
The lips are the visible body part at the mouth of many animals, including humans. Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech. Human lips are a tactile sensory organ, and can be ...
is finely crenulated within. The
columella
Lucius Junius Moderatus Columella (; Arabic: , 4 – ) was a prominent writer on agriculture in the Roman Empire.
His ' in twelve volumes has been completely preserved and forms an important source on Roman agriculture, together with the ...
is short, arcuate, with a white callus above and two transverse tubercles at its base. The color of the shell is reddish or pale tan to dark brown, usually with irregular, axially distributed splotches of white, and fine spiral lines of alternating reddish and white spots or streaks. A pale band is often present at the periphery of the last whorl.
(described as ''Chlorostoma fasciatus'')
Distribution
''A. fasciatum'' often lives under rocks at low tide level, and is abundantly found throughout southern Florida
Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, a ...
, the Caribbean Sea
The Caribbean Sea ( es, Mar Caribe; french: Mer des Caraïbes; ht, Lanmè Karayib; jam, Kiaribiyan Sii; nl, Caraïbische Zee; pap, Laman Karibe) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico ...
and the West Indies
The West Indies is a subregion of North America, surrounded by the North Atlantic Ocean and the Caribbean Sea that includes 13 independent island countries and 18 dependencies and other territories in three major archipelagos: the Great ...
(Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth#Surface, Earth's surface and about 29% of its water surface area. It is known to separate the "Old World" of Afr ...
)
References
* Gmelin, J. F. 1791. ''Systema naturae per regna tria naturae''. Editio decima tertia. Systema Naturae, 13th ed., vol. 1(6): 3021-3910. Lipsiae
* Lamarck, . B.1822. ''Histoire naturelle des animaux sans vertèbres''. Histoire Naturelle des Animaux sans Vertèbres 7: ii+ 711 pp. Author: Paris.
* Philippi, R. A. 1845. ''Trochus. Abbildungen und Beschreibungen neuer oder wenig gekannter Conchylien'' 2(1-2): 13-18, 35-40, pl. 6-7
* Adams, C. B. 1850. ''Monograph of Vitrinella, a New Genus of New Species of Turbinidae''. 10 pp. Author: Amherst, Massachusetts.
* Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. ''Gastropoda (Mollusca) of the Gulf of Mexico,'' Pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas
External links
''Tegula fasciata''
(Hardy's Internet Guide to Marine Gastropods)
Born, I. Von. (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.
Tenison Woods, J. E. (1877). On some new Tasmanian marine shells. (Second series). Papers and Proceedings and Report of the Royal Society of Tasmania. (1876): 131-159
Dornellas, A. P.; Graboski, R. M.; Hellberg, M. E.; Lotufo, T. M. C. (2021). Phylogeography of Agathistoma (Turbinidae, Tegulinae) snails in tropical and southwestern Atlantic. Zoologica Scripta. DOI: 10.1111/zsc.12517
{{Taxonbar, from=Q3176346
fasciatum
Gastropods described in 1778