Belongs within: Hypsogastropoda.
The Zygopleuridae are slender-shelled gastropods known from the Triassic and Jurassic periods (Knight et al. 1960).
Characters (Knight et al. 1960): Shell slender; protoconch smooth, of up to about three regularly increasing whorls; ornament narrow collabral riblets, sometimes with parasigmoid curve; subordinate spiral ornament occasionally present.
<==Zygopleuridae
|--Allostrophia Kittl 1894 [Allostrophiinae]BR05
| `--*A. perversa (Münster 1841) (n. d.) [=Melania perversa]KC60
|--Ampezzopleura Bandel 1991BR05 [AmpezzopleurinaeBR17]
| `--*A. tenuis Nützel 1998BR17
|--Andangularia Haas 1953 [Andangulariinae]BR17
| `--*A. subarmata (Jaworski 1923) [=Pseudoscalites subarmatus]BR17
`--ZygopleurinaeBR17
|--Anoptychia Koken 1892 [Anoptychiidae]BR17
| |--*A. supraplecta (Münster 1841) [=Melania supraplecta, Chemnitzia supraplecta]KC60
| |--A. multitorquata (Münster 1841) [=Chemnitzia multitorquata]BR17
| `--A. turritellaris (Münster 1841) [=Chemnitzia turritellaris]BR17
`--Zygopleura Koken 1892 [Zygopleurinae]BR05
|--Z. hybridissima Nützel 1998BR17 (see below for synonymy)
|--Z. acuticostataB91
|--Z. arctecostata (Münster 1841) [=Loxonema arctecostata]B91
|--Z. bakhmouthinensisG31
|--Z. cotteaui Cossmann 1913TTE93
|--Z. cylindricaB91
|--Z. haasi Batten & Stokes 1986NE02
|--Z. haueri (Klipstein 1841)B91
|--Z. meyeri (Klipstein 1843) [=Cerithium meyeri]KC60
|--Z. mysis (d’Orbigny 1850)TTE93
|--Z. rugosa Batten & Stokes 1986NE02
|--Z. ryazanceviG31
`--Z. tenuis (Münster 1841) [=Loxonema tenuis]B91
Zygopleuridae incertae sedis:
Katosira Koken 1892KC60
|--*K. fragilis Koken 1892KC60
`--K. perinianaKC60
Kittliconcha Bonarelli 1927KC60
|--*K. cassiana (Bonarelli 1927) (see below for synonymy)KC60
|--K. obliquecostataB91
`--K. sciaphostera Batten & Stokes 1986NE02
Allocosmia Cossmann 1897 [=Heterocosmia Koken 1896 non Ehrenberg 1872]KC60
|--*A. grandis (Hörnes 1855) [=Holopella grandis, *Heterocosmia grandis]KC60
`--A. multicostata (Hayasaka 1943)TTE93
Hypsipleura Koken 1892KC60
|--*H. cathedralis Koken 1892KC60
`--H. subnodosaKC60
Tyrsoecus Kittl 1892 [incl. Coronaria Koken 1892 non Lowe 1854, Stephanocosmia Cossmann 1895]KC60
|--T. cassiani Cox in Knight, Cox et al. 1960 (see below for synonymy)KC60
`--T. subcompressusKC60
Raha Marwick 1953KC60
|--*R. spectabilis (Trechmann 1918) [=Coronaria spectabilis]KC60
`--R. yabei (Hayasaka 1943)TTE93
Virgella deGregorio 1930KC60
`--*V. jucunda deGregorio 1930KC60
Rigauxia Cossmann 1885KC60
`--*R. canaliculata (Rigaux & Sauvage 1868) [=Chemnitzia canaliculata]KC60
Zardinistylus Bandel 1991B91
`--*Z. misurinensis [=Coelochrysalis misurinensis, Zygopleura misurinensis]B91
*Kittliconcha cassiana (Bonarelli 1927) [=Zygopleura (*Kittliconcha) cassiana, Loxonema walmstedti Kittl 1894 non Turritella walmstedti Klipstein 1843]KC60
Tyrsoecus cassiani Cox in Knight, Cox et al. 1960 [=Turritella compressa Münster 1841 non Münster 1840, *Ty. compressus]KC60
Zygopleura hybridissima Nützel 1998BR17 [=Turritella hybrida Münster 1841 non Deshayes 1832BR17, Loxonema hybridaB91, *Zygopleura hybridaBR17]
*Type species of generic name indicated
References
[B91] Bandel, K. 1991. Über triassische “Loxonematoidea” und ihre Beziehungen zu rezenten und paläozoischen Schnecken. Paläontologische Zeitschrift 65 (3–4): 239–268.
[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.
[G31] Grabau, A. W. 1931. The Permian of Mongolia: A report on the Permian fauna of the Jisu Honguer limestone of Mongolia and its relations to the Permian of other parts of the world. American Museum of Natural History: New York.
[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.
[NE02] Nützel, A., & D. H. Erwin. 2002. Battenizyga, a new Early Triassic gastropod genus with a discussion of the caenogastropod evolution at the Permian/Triassic boundary. Paläontologische Zeitschrift 76 (1): 21–27.
[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.