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Plesiothyreus
Shell of Plesiothyreus cossmanni (lectotype at MNHN, Paris)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Neritimorpha
Order:	Cycloneritida
Family:	Phenacolepadidae
Genus:	Plesiothyreus Cossmann, 1888
Type species
† Capulus parmophoroides Cossmann, 1885
Synonyms
Cinnalepeta Iredale, 1929 Phenacolepas Pilsbry, 1891 Pileopsis (Scutellina) Scutella Broderip, 1834 (Invalid: junior homonym of Scutella Lamarck, 1816 ; Scutellina and Phenacolepas are replacement names) Scutellina Gray, 1847 (Invalid: junior homonym of Scutellina Agassiz, 1841 ; Phenacolepas is a replacement name) Scutulina Cossmann, 1912

Plesiothyreus is a genus of very small sea snails or limpets, marine gastropod mollusks in the subfamily Phenacolepadinae of the family Phenacolepadidae.

Species

Species within the genus Plesiothyreus include:

• Plesiothyreus aculeatus (Pease, 1868)
• Plesiothyreus arabicus (K.H.J. Thiele, 1909 ) (synonym: Phenacolepas arabica K.H.J. Thiele, 1909)
• Plesiothyreus brocki (Thiele, 1909)
• Plesiothyreus cancellatus (Pease, 1861)
• Plesiothyreus cinnamomeus (Gould, 1846)
• Plesiothyreus compressus (Pease, 1868)
• Plesiothyreus cosmanni Jousseaume, 1894
• Plesiothyreus cytherae (Lesson, 1831)
• Plesiothyreus elongatus (Thiele, 1909)
• Plesiothyreus evansi (Biggs, 1973)
• Plesiothyreus fischeri (Rochebrune, 1882)
• Plesiothyreus galathea (J.B.P.A. Lamarck, 1819) (synonym: Phenacolepas galathea (J.B.P.A. Lamarck, 1819)
• Plesiothyreus granocostatus (Pease, 1868)
• Plesiothyreus granulosus (Thiele, 1909)
• Plesiothyreus guttatus (Thiele, 1909)
• Plesiothyreus hamillei (P. Fischer, 1857)
• Plesiothyreus indicus (Thiele, 1909)
• Plesiothyreus malonei (Vanatta, 1912)
• Plesiothyreus newtoni G. B. Sowerby III, 1894
• Plesiothyreus omanensis (Biggs, 1973)
• Plesiothyreus pararabicus (Christiaens, 1988)
• † Plesiothyreus parmophoroides (Cossmann, 1885)
• Plesiothyreus peelae Christiaens, 1989
• † Plesiothyreus pliocenicus (Chirli, 2004)
• Plesiothyreus puntarenae (Mörch, 1860)
• Plesiothyreus radiatus (Schepman, 1908)
• Plesiothyreus reticulatus (Thiele, 1909)
• Plesiothyreus scobinatus (A. Gould, 1859)

Species brought into synonymy

• Plesiothyreus asperulatus (A. Adams, 1854): synonym of Phenacolepas galathea (Lamarck, 1819): synonym of Zacalantica galathea (Lamarck, 1819) (based on nomen nudum)
• Plesiothyreus cosmani Jousseaume, 1894: synonym of Plesiothyreus cossmanni Jousseaume, 1894 (incorrect original spelling)
• Plesiothyreus rushii (Dall, 1889): synonym of Hyalopatina rushii (Dall, 1889)
• Plesiothyreus gruveli (Dautzenberg, 1929) (uncertain > taxon inquirendum)

References

1. Cossmann (1888). Ann. Soc. malac. Belgique 23: 191.
2. Plesiothyreus. Retrieved through: World Register of Marine Species on 4 May 2010.
3. Plesiothyreus hamillei (P. Fischer, 1857). Retrieved through: World Register of Marine Species on 4 May 2010.
4. Plesiothyreus rushii (Dall, 1889). Retrieved through: World Register of Marine Species on 4 May 2010.

External links

• Cossmann M. (1886–1913). Catalogue illustré des coquilles fossiles de l'Eocène des environs de Paris. Annales de la Société Royale Malacologique de Belgique. Part 1: vol. 21 [1886]. Part 2: vol. 22 [1887]. Part 3: vol. 23 [1888]. Part 4: vol. 24 [1889]. Part 5 + Suppl. : vol. 26
• Pilsbry H.A. (1891). On the use of the generic name Scutellina. The Nautilus. 5(8): 88–89
• Broderip W.J. (1834). Description of a new genus of Gasteropoda. Proceedings of the Zoological Society of London. 2: 47–49
• Iredale, T. (1929). Queensland molluscan notes, no. 1. Memoirs of the Queensland Museum. 9(3): 261–297, pls 30–31
• Fukumori H., Yahagi T., Warén A. & Kano Y. (2019). Amended generic classification of the marine gastropod family Phenacolepadidae: transitions from snails to limpets and shallow-water to deep-sea hydrothermal vents and cold seeps. Zoological Journal of the Linnean Society. 185(3): 636–655

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