Distorsio decipiens, copyright H. Zell.

Belongs within: Cassoidea.

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.

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

Personidae BR05
    |--Persona Montfort 1810 [Personina, Personinae] BR05
    |--Calcarella Souleyet 1850 [Calcarellidae] BR05
    |--Personopsis purpurata Beu 1998 S11
    `--Distorsio Röding 1798 [Distorsiinae, Distorsioninae] BR05
         |  i. s.: 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. (Distorsio) BC01
         |           |--D. (D.) decussata (Valenciennes 1832) [=Tritonium decussatum] BC01
         |           `--D. (D.) jenniernestae Emerson & Piech 1992 BC01
         |--D. clathrata (Lamarck 1816) S11, ES90 (see below for synonymy)
         `--+--D. anus (Linnaeus 1758) S11, WG71
            `--+--D. decipiens (Reeve 1844) S11
               `--D. reticularis (Linné 1758) S11, ES90 (see below for synonymy)

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

Distorsio reticularis (Linné 1758) S11, ES90 [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.

[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.

[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.

[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.

[WG71] Wilson, B. R., & K. Gillett. 1971. Australian Shells: illustrating and describing 600 species of marine gastropods found in Australian waters. A. H. & A. W. Reed: Sydney.

Last updated: 1 May 2017.

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