Tectisumen clypidellaeformis, from here.

Belongs within: Vetigastropoda.

The Lepetelloidea are a group of small limpets found in deep-sea environments, characterised by an undivided shell muscle and a gill comprising a row of leaflets. The shell is low to steeply conical with the apex central or posterior to the middle and with a round or oval aperture (Knight et al. 1960).

<==Lepetelloidea BR17
    |--Bathyphytophilus Moskalev 1978 [Bathyphytophilidae] BR05
    |    `--*B. caribaeus Moskalev 1978 BR17
    |--Caymanabyssia Moskalev 1976 [Caymanabyssiidae, Caymanabyssiinae] BR05
    |    `--*C. spina Moskalev 1976 BR17
    |--Osteopelta Marshall 1987 [Osteopeltidae] BR05
    |    `--*O. mirabilis Marshall 1987 BR17
    |--Pyropelta McLean & Haszprunar 1987 [Pyropeltidae] BR05
    |    `--*P. musaica McLean & Haszprunar 1987 BR17
    |--Cocculinella Thiele 1909 [Cocculinellidae] BR05
    |    `--*C. minutissima (Smith 1904) [=Acmaea minutissima] KC60
    |--Addisoniidae [Addisonioidea] BR05
    |    |--Helicopelta Marshall 1996 [Helicopeltinae] BR05
    |    |    `--*H. rostricola Marshall 1996 BR17
    |    `--Addisonia Dall 1882 [Addisoniinae] BR05
    |         |--*A. paradoxa Dall 1882 KC60
    |         |--A. enodis Simone 1996 S11
    |         `--A. excentrica PP64
    |--Pseudococculinidae BR05
    |    |--Copulabyssia riosi Leal & Simone 2000 S11
    |    |--Kaiparapelta singularis Marshall 1986 TTE93
    |    |--Pseudococculina Schepman 1908 BR05
    |    |    |--*P. rugosoplicata Schepman 1908 [=Cocculina (*Pseudococculina) rugosoplicata] KC60
    |    |    `--P. rimula Simone & Cunha 2003 S11
    |    `--Notocrater Finlay 1927 BR05, P61 (see below for synonymy)
    |         |--*N. craticulata (Suter 1908) [=Cocculina craticulata] P61
    |         |--N. maxwelli Marshall 1986 TTE93
    |         `--N. tasmanica (Pilsbry 1895) F27a (see below for synonymy)
    `--Lepetellidae [Lepetellinae] BR05
         |--Sablea minuta Allen 1970 TTE93
         |--Lepetella Verrill 1880 BR05 [=Leptella (l. c.) nec Hall & Clarke 1892 nec Reuter 1894 nec Enderlein 1901 M-WW65]
         |    `--*L. tubicola Verrill & Smith 1880 BR17
         |--Tecticrater Dell 1956 KC60
         |    |--*T. compressa (Suter 1908) P61 (see below for synonymy)
         |    |--T. cervae (Fleming 1948) P61
         |    |--T. finlayi (Powell 1937) P61
         |    `--T. subcompressa (Powell 1937) P61
         `--Tectisumen Finlay 1927 KC60
              |--*T. clypidellaeformis (Suter 1908) P61 (see below for synonymy)
              |--T. coercita [=Cocculinella coercita] F27a
              |--T. mayi Finlay 1927 F27a
              `--T. tasmanica (May 1919) P95, F27b (see below for synonymy)

Notocrater Finlay 1927 BR05, P61 [incl. Coccopygia Dall 1889 non Reichenbach 1862 KC60, Dallia Jeffreys 1883 non Bean 1878 KC60]

Notocrater tasmanica (Pilsbry 1895) F27a [=Acmaea tasmanica F27b, Cocculina tasmanica F27a, Cocculinella tasmanica F27b]

*Tecticrater compressa (Suter 1908) P61 [=Cocculina compressa P61, Lepetella (*Tecticrater) compressa KC60, Tectisumen compressa F27a]

*Tectisumen clypidellaeformis (Suter 1908) P61 [=Cocculina clypidellaeformis P61, Lepetella (*Tectisumen) clypidellaeformis KC60]

Tectisumen tasmanica (May 1919) P95, F27b [=Cocculinella tasmanica non Acmaea tasmanica Pilsbry 1895 (not preoc. if in dif. gen.) F27a, Cocculina mayi Finlay 1923 F27b]

*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.

[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.

[KC60] Knight, J. B., L. R. Cox, A. M. Keen, R. L. Batten, E. L. Yochelson & R. Robertson. 1960. Gastropoda: systematic descriptions. 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. I169–I331. Geological Society of America, and University of Kansas Press.

[M-WW65] Muir-Wood, H., & A. Williams. 1965. Strophomenida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt H. Brachiopoda vol. 1 pp. H361–H521. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas Press: Lawrence (Kansas).

[PP64] Peres, J. M., & J. Picard. 1964. Nouveau manuel de bionomie benthique de la mer Mediterranee. Recueil des Travaux de la Station Marine d'Endoume, Bulletin 31 (27): 5–137.

[P95] Ponder, W. F. 1995. Book review: Australian Marine Shells. Prosobranch Gastropods. Parts 1 and 2. Molluscan Research 16: 97–102.

[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4th ed. Whitcombe and Tombs Limited: Christchurch.

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

[TTE93] Tracey, S., J. A. Todd & D. H. Erwin. 1993. Mollusca: Gastropoda. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 131–167. Chapman & Hall: London.

Last updated: 23 October 2021.

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