''Thatcheria'' is a
genus of
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
s, marine
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusks in the
family Raphitomidae
Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 39 ...
.
Description
(Original description) The solid shell is angularly pyriform. The
spire is prominent, shorter than the
aperture. It is many-whorled with
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 floral ...
s flattened above, strongly keeled at the periphery and contracted below. The aperture shows a broad incurved sinus between the extremity of the last keel and the junction of the
body whorl
The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk.
In gastropods
In gastropods, the b ...
. The
siphonal canal
The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...
is wide and open. The
columella is smooth. The outer
lip is simple below the sinus.
Species
Species within the genus ''Thatcheria'' include:
* † ''
Thatcheria circumfossa''
(Koenen, 1872)
* ''
Thatcheria janae''
Lorenz & Stahlschmidt, 2019
* † ''
Thatcheria liratula''
(Powell, 1942)
* ''
Thatcheria mirabilis''
Angas, 1877
* † ''
Thatcheria pagodula''
(Powell, 1942)
* † ''
Thatcheria waitaraensis''
(Marwick, 1926)
References
* Marwick, J. (1931). The Tertiary Mollusca of the Gisborne District. New Zealand Geological Survey Paleontological Bulletin 13:1-177. 18: pls.
* Powell, A.W.B. 1966. ''The molluscan families Speightiidae and Turridae, an evaluation of the valid taxa, both Recent and fossil, with list of characteristic species.'' Bulletin of the Auckland Institute and Museum. Auckland, New Zealand 5: 1–184, pls 1–23
* Wilson, B. 1994. ''Australian marine shells.'' Prosobranch gastropods. Kallaroo, WA : Odyssey Publishing Vol. 2 370 pp.
External links
A.J. Charig, The Gastropod Genus Thatcheria and its Relationships; Bulletin of the British Museum (Natural History), vol. 7 # 9 (1963)*
{{Commons category
Raphitomidae