Distorsio decipiens, copyright H. Zell.

Belongs within: Tonnoidea.

The Personidae are a small group of marine gastropods with a characteristically distorted coiling, found at moderate depths in warm waters. Past classifications included them among the Ranellidae but more recent authors have argued that many of the common features of the two families evolved in parallel. Within the Personidae, members of the genus Distorsio are generally larger than species of Personopsis.

Characters (from here): Whorls knobbed, with distorted coiling; operculum small, black; radula with spiny crescent-shaped teeth.

<==Personidae BR05
    |--Personopsis purpurata Beu 1998 S11
    |--Calcarella Souleyet 1850 [Calcarellidae] BR05
    |    `--*C. spinosa Souleyet 1850 BR17
    `--Distorsio Röding 1798 [=Persona Montfort 1810; Distorsiinae, Distorsioninae, Personina, Personinae] BR05
         |  i. s.: ‘Persona’ constrictus C64
         |         D. euconstricta Beu 1986 BC01
         |         D. graceiellae Parth 1989 BC01
         |         D. habei Lewis 1972 MG-H11
         |         D. minoruohnishii Parth 1989 BC01
         |         D. perdistorta Fulton 1938 ES90
         |         D. smithi von Maltzan 1844 ES90
         |         D. ventricosa Kronenberg 1994 BC01
         |         D. (Personella Conrad 1865) C75
         |           |--D. (*P.) septemdentata Gabb 1860 C75
         |           |--D. (P.) beui Maxwell 1968 C75
         |           `--D. (P.) pusilla Pease 1861 [=Persona pusilla] C75
         |         D. (Rhysema Clench & Turner 1956) C75
         |           `--D. (R.) reticulata Roeding 1798 C75
         |--D. clathrata (Lamarck 1816) S11 (see below for synonymy)
         `--+--D. (Distorsio) BC01
            |    |--*D. (D.) anus (Linnaeus 1758) BR17, S11 [=Murex anus BR17, *Persona anus BR17]
            |    |--D. (D.) decussata (Valenciennes 1832) [=Tritonium decussatum] BC01
            |    `--D. (D.) jenniernestae Emerson & Piech 1992 BC01
            `--+--D. decipiens (Reeve 1844) S11
               `--D. reticularis (Linné 1758) S11 (see below for synonymy)

Distorsio clathrata (Lamarck 1816) S11 [=Triton clathratus ES90; incl. T. ridens Reeve 1844 ES90, Distorsio ridens ES90, Persona ridens C64, D. robinsoni Petuch 1987 ES90]

Distorsio reticularis (Linné 1758) S11 [=Persona reticularis G79; incl. Murex cancellinus de Roissy 1805 ES90, D. cancellinus ES90, D. reticulata (Röding 1798) ES90]

*Type species of generic name indicated


[BR05] Bouchet, P., & J.-P. Rocroi. 2005. Classification and nomenclator of gastropod families. Malacologia 47 (1–2): 1–397.

[BR17] Bouchet, P., J.-P. Rocroi, B. Hausdorf, A. Kaim, Y. Kano, A. Nützel, P. Parkhaev, M. Schrödl & E. E. Strong. 2017. Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia 61 (1–2): 1–526.

[BC01] Boyko, C. B., & J. R. Cordeiro. 2001. Catalog of Recent type specimens in the Division of Invertebrate Zoology, American Museum of Natural History. V. Mollusca, part 2 (class Gastropoda [exclusive of Opisthobranchia and Pulmonata], with supplements to Gastropoda [Opisthobranchia], and Bivalvia). Bulletin of the American Museum of Natural History 262: 1–170.

[C64] Carpenter, P. P. 1864. Supplementary report on the present state of our knowledge with regard to the Mollusca of the west coast of North America. Report of the British Association for the Advancement of Science 33: 517–686.

[C75] Cernohorsky, W. O. 1975. The taxonomy of some Indo-Pacific Mollusca. Part 3. With descriptions of new taxa and remarks on an Ecuadorian fossil species of Turridae. Records of the Auckland Institute and Museum 12: 213–234.

[ES90] Emerson, W. K., & W. E. Sage III. 1990. Distorsio ridens (Reeve, 1844): a synonym of Distorsio clathrata (Lamarck, 1816) (Gastropoda: Personidae). Nautilus 103 (4): 131–135.

[G79] Guppy, R. J. L. 1879. First sketch of a marine invertebrate fauna of the Gulf of Paria and its neighbourhood. Part I.—Mollusca. Journal of Conchology 2: 151–172.

[MG-H11] McEnnulty, F. R., K. L. Gowlett-Holmes, A. Williams, F. Althaus, J. Fromont, G. C. B. Poore, T. D. O’Hara, L. Marsh, P. Kott, S. Slack-Smith, P. Alderslade & M. V. Kitahara. 2011. The deepwater megabenthic invertebrates on the western continental margin of Australia (100–1100 m depths): composition, distribution and novelty. Records of the Western Australian Museum Supplement 80: 1–191.

[S11] Simone, L. R. L. 2011. Phylogeny of the Caenogastropoda (Mollusca), based on comparative morphology. Arquivos de Zoologia 42 (4): 161–323.

Last updated: 7 June 2021.

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