Retusa truncatula, from here.

Belongs within: Cephalaspidea.

The Retusidae, canoe shells, are a family of cephalaspid gastropods characterised by the lack of a radula.

<==Retusidae [Retusoidea, Rhizoridae, Volvulellidae, Volvulidae]
    |--Ventomnestia girardi (Audouin 1827) [=Bulla girardi, Alicula girardi, Cylichna girardi] BD86
    |--‘Volvula’ Adams 1850 non Gistl 1848 BR05
    |    `--V. sulcata (Watson 1883) [=Cylichna sulcata] H09
    |--Rhizorus Montfort 1810 BR05
    |    |--‘Bulla’ acuminata [incl. *Rhizorus adelaidis] F27a
    |    |--R. nesentus Finlay 1927 F27a
    |    `--R. reflexus [=Cylichna reflexa] F27a
    |--Volvulella Newton 1891 BR05
    |    |--*V. acuminata [=Volvula acuminata] O27
    |    |--V. californica Dall 1919 O27
    |    |--V. cooperi Dall 1919 O27
    |    `--V. cylindrica Carpenter 1863 O27
    `--Retusa Brown 1827 BR05
         |  i. s.: R. amphizosta (Watson 1883) [=Utriculus amphizosta] H09
         |         R. complanata (Watson 1883) [=Utriculus complanatus] H09
         |         R. decapitata Dall 1896 F27b
         |         R. mamillata M62
         |         R. nitida (Adams 1850) [=Bulla nitida] H09
         |         R. obtusa Montagu 1803 O27
         |         R. oruaensis HS01
         |         R. ovata C60
         |         R. pertenuis Mighels 1843 O27
         |         R. semen Reeve 1856 O27
         |         R. simillima (Watson 1883) [=Utriculus simillimus] H09
         |         R. succincta GAS03
         |         R. suteri Finlay 1927 [=Tornatina decapitata Suter 1909, R. decapitata non Dall 1896] F27b
         |--*R. (Retusa) truncatula (Bruguiere 1772) [=Bulla truncatula] O27
         |--R. (Coleophysis Fischer 1883) O27
         |    `--R. (C.) harpa Dall 1871 O27
         `--R. (Sulcularia Dall 1920) O27
              `--R. (S.) xystrum Dall 1919 O27

*Type species of generic name indicated


[BD86] Barash, A., & Z. Danin. 1986. Further additions to the knowledge of Indo-Pacific Mollusca in the Mediterranean Sea (Lessepsian migrants). Spixiana 9 (2): 117–141.

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

[C60] Cox, L. R. 1960. Gastropoda: general characteristics of Gastropoda. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt I. Mollusca 1: Mollusca—General Features, Scaphopoda, Amphineura, Monoplacophora, Gastropoda—General Features, Archaeogastropoda and some (mainly Paleozoic) Caenogastropoda and Opisthobranchia pp. I84–I169. Geological Society of America, and University of Kansas Press.

[F27a] Finlay, H. J. 1927a. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320–485.

[F27b] Finlay, H. J. 1927b. New specific names for austral Mollusca. Transactions and Proceedings of the New Zealand Institute 57: 488–533.

[GAS03] Gulbin, V. V., I. S. Arzamastsev & V. M. Shulkin. 2003. Ecological monitoring of the water area of Port Vostochnyi (Wrangel Bay) in the Sea of Japan (1995–2002). Russian Journal of Marine Biology 29 (5): 284–295.

[HS01] Hayward, B. W., A. B. Stephenson, M. S. Morley, W. M. Blom, H. R. Grenfell, F. J. Brook, J. L. Riley, F. Thompson & J. J. Hayward. 2001. Marine biota of Parengarenga Harbour, Northland, New Zealand. Records of the Auckland Museum 37: 45–80.

[H09] Hedley, C. 1909. The Marine Fauna of Queensland: Address by the President of Section D. Australasian Association for the Advancement of Science: Brisbane.

[M62] Monniot, F. 1962. Recherches sur les graviers a Amphioxus de la rĂ©gion de Banyuls-sur-Mer. Vie et Milieu 13: 231–322.

[O27] Oldroyd, I. S. 1927. The Marine Shells of the West Coast of North America vol. II pt I. Stanford University Press: Stanford University (California).


  1. Reading this list my brains tried to cope with all the codes, but this publication is unnecessary complicated abacadabra, too many un-explained or even in dictionaries un-detectable (personal? words, probably jargon only clear to the author. I can only by reading first the list of authors, re-route numbers and letter codes to authors. Why not mention them direct in your diagram? More reader friendly.I love the pictures though.

    1. Why not mention them direct in your diagram?

      Primarily a question of space; I can't really make each entry in the tree longer than a single line without making the tree too difficult to read. There's also the personal convenience that the codes are much easier to edit (I do go back and update and/or modify entries over time) and I do have only so much time for this project. There are a number of things that would be done differently if this was a professional production, I will admit.


Markup Key:
- <b>bold</b> = bold
- <i>italic</i> = italic
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