Mikadotrochus beyrichii
Drawing with an apertural view of Mikadotrochus beyrichii
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Vetigastropoda
Superfamily:
Pleurotomarioidea
Family:
Pleurotomariidae
Genus:
Mikadotrochus
Species:
M. beyrichii
Binomial name
Mikadotrochus beyrichii
(Hilgendorf, 1877) [1]
Synonyms

Mikadotrochus beyrichii, common name Beyrich's slit shell, is a species of sea snail, a marine gastropod mollusk in the family Pleurotomariidae.[2]

It was discovered by Franz Martin Hilgendorf in an ancient Japanese collection.

Description

The size of the shell varies between 50 mm and 100 mm. The shell has a trochiform shape. It is as high as broad. It has a flat base. It shows moderately numerous spiral lines. It is pale yellow, beautifully flamed with 11 red whorls that are regularly increasing. The penultimate whorl has 8 lirae above, 2 in and 2 under the slit fasciole. These lirae are beset with weak nodules, about 3 times as long (in the direction of the spiral) as high or broad. The body whorl has a blunt angle at its base. This base contains 20 concentric lirae, and in the middle a deep pit or "false umbilicus". On the outside it is white, on the inside it is pearly. The thick, pearly columellar margin is S-shaped.[3]

Distribution

M. beyrichii is endemic to the coastal waters of Japan.[4] and China

Mikadotrochus beyrichii (Hilgendorf, 1877). Museum specimen, Naturalis Leiden.

References

  1. ↑ Hilgendorf in Sitzungsb. d. Gesellsch. Naturf. Freunde Berlin, 1877, p. 72.
  2. ↑ Mikadotrochus beyrichii (Hilgendorf, 1877). Retrieved through: World Register of Marine Species on 14 March 2013.
  3. ↑ G.W. Tryon (1890), Manual of Conchology vol. XII, p. 71 (described as Pleurotomaria beyrichii)
  4. ↑ Oliver, A.P.H. (2004). Guide to Seashells of the World. Buffalo: Firefly Books. 17.
  • Dautzenberg, Ph.; Fischer, H. (1898). Note sur le Pleurotomaria beyrichi. J. conchyliol. XLVI: 218–224, plate XI
  • Williams S.T., Karube S. & Ozawa T. (2008) Molecular systematics of Vetigastropoda: Trochidae, Turbinidae and Trochoidea redefined. Zoologica Scripta 37: 483–506
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  • "Mikadotrochus beyrichii". Gastropods.com. Retrieved 16 January 2019.
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