Scenellidae

Latex mould of Pichynella annulata, from Tortello & Sabattini (2011). Scale bar = 0.2 mm.

Belongs within: Helcionelliformes.

The Scenellidae are a group of univalved molluscs known from the Early Cambrian, with a simple cap-shaped shell without a peripheral buttress (Parkhaev 2002, as Helcionellidae).

<==Scenellidae [Eomonoplacophora, Helcionellidae, Helcionellinae] BR05
    |--Bemella Missarzhevsky in Rozanov et al. 1969 [incl. Charaulachella Vassiljeva 1990] P02
    |--Ilsanella Missarzhevsky 1981 P02
    |--Tannuella Missarzhevsky in Rozanov et al. 1969 P02
    |--Igorella Missarzhevsky in Rozanov et al. 1969 P02
    |--Obtusoconus Yu 1979 P02
    |--Emarginoconus Yu 1979 P02
    |--Securiconus Jiang 1980 P02
    |--Marocella Geyer 1986 P02
    |--Igorellina Missarzhevsky 1989 P02
    |--Pararaconus Runnegar in Bengtson et al. 1990 P02
    |--Lenoconus Vassiljeva 1990 P02
    |--Asperconella Landing in Landing & Bartowski 1996 P02
    |--Pseudopatella Zhegallo in Esakova & Zhegallo 1996 P02
    |--Paucella Vassiljeva 1998 P02
    |--Helcionella Grabau & Shimer 1909 P02
    |    `--*H. subrugosa (d’Orbigny 1850) (see below for synonymy) KC60
    |--Hampilina Kobayashi 1958 [Hampilininae, Hamplininae] P02
    |    `--*H. goniospira Kobayashi 1958 KC60
    |--Scenella Billings 1872 P02 [incl. Parmophorella Matthew 1886 F62; Scenellinae]
    |    `--*S. reticulata Billings 1872 F62
    |--Randomia Matthew 1899 P02
    |    `--*R. aurorae Matthew 1899 F62
    `--Pichynella Rusconi 1954 F62
         `--*P. annulata Rusconi 1954 F62

*Helcionella subrugosa (d’Orbigny 1850) [=Helcion subrugosa, Metoptoma rugosa Hall 1847, Helcion rugosa non Sowerby 1817] KC60

*Type species of generic name indicated

REFERENCES

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

[F62] Fisher, D. W. 1962. Small conoidal shells of uncertain affinities. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt W. Miscellanea: Conodonts, Conoidal Shells of Uncertain Affinities, Worms, Trace Fossils and Problematica pp. W98–W143. Geological Society of America, and University of Kansas Press.

[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.

[P02] Parkhaev, P. Yu. 2002. Phylogenesis and the system of the Cambrian univalved mollusks. Paleontologicheskii Zhurnal 2002 (1): 27–39 (transl. Paleontological Journal 36 (1): 25–36).