Belongs within: Gastropoda.
The Subulitoidea are an Ordovician to Permian group of gastropods lacking a sinus or slit in the outer lip (Knight et al. 1960).
Characters (Knight et al. 1960, as Subulitacea): Subulate, acicular to subglobular; commonly with anterior notch and columellar fold, though weakly developed in some, also basically with parietal fold; inner shell layers not sharply differentiated, not nacreous.
<==Subulitoidea [Subulitacea]
| i. s.: Ninglangella Pan & Erwin 2002PE02
| `--*N. ninglangensis Pan & Erwin 2002PE02
| Nanochilina Frýda 1998FB04
| |--*N. holynensis Frýda 1998FB04
| `--N. gubanovi Frýda & Blodgett 2004FB04
|--Ischnoptygma Erwin 1988 [Ischnoptygmatidae, Ischnoptygmidae]BR05
| `--*I. archibaldi Erwin 1988BR17
`--Subulitidae [Subulitinae]BR05
|--Fusispira Hall 1871 [Fusispiridae]BR05
| `--*F. ventricosa Hall 1871BR17 [=Subulites (*Fusispira) ventricosusKC60]
|--Sinospira Yin 1932KC60
| `--*S. ornata Yin 1932KC60
|--Ceraunocochlis Knight 1931KC60
| `--*C. fulminula Knight 1931KC60
|--Bulimorpha Whitfield 1882BR05 [=Bulimella Hall 1858 non Pfeiffer 1854KC60; Bulimorphidae]
| |--*B. bulimiformis (Hall 1858)PE02 [=*Bulimella bulimiformisKC60]
| `--B. dimorpha [=Polyphemopsis dimorpha]G31
|--Leptoptygma Knight 1936PE02
| |--*L. virgatum (Knight 1931)PE02 [=Auriptygma virgatumKC60]
| |--L. australeBRW98
| |--L. golconda Thein & Nitecki 1974PE02
| `--L. laetus Pan & Erwin 2002PE02
|--Macrochilus Lindström 1884KC60 (see below for synonymy)
| |--‘Buccinites’ arculatum Schlotheim 1820 [=*Duncania arculata, *Macrocheilus arculatus]BR17
| |--M. anguliferus White 1874W77
| |--M. intercalare [incl. M. intercalare var. pulchella]G31
| `--M. subulitidesG31
|--Subulites Emmons 1842BR05 [incl. Polyphemopsis Portlock 1843KC60
| | i. s.: ‘Polyphemopsis’ inornataG31
| | ‘Polyphemopsis’ nitidulumG31
| | S. revalensis Koken 1925D94
| |--*S. (Subulites) subelongatus (Orbigny 1850)FB04 (see below for synonymy)
| `--S. (Cyrtospira Ulrich in Ulrich & Scofield 1897)KC60
| `--S. (*C.) tortilis (Ulrich in Ulrich & Scofield 1897) [=*Cyrtospira tortilis]KC60
`--Strobeus de Koninck 1881TTE93, KC60 [=Strobaeus Cossmann 1909KC60; Strobeidae]
|--*S. ventricosus de Koninck 1881PE02
|--S. angulifera (White 1884)PE02
|--S. dongluoensis Pan & Yu 1993 [=Labridens dongluoensis]PE02
|--S. girtyi Erwin 1988PE02
|--S. jisuensis (Grabau 1931)PE02
|--S. mediterranea (Germm in Qiao 1983)PE02
|--S. paludinaeformis (Hall 1858)TTE93
`--S. transitorius Grabau 1931PE02
Macrochilus Lindström 1884KC60 [=Duncania Bayle 1879 non deKoninck 1872BR17, Macrocheilus Phillips 1841 non Kirby 1838BR05; Macrocheilidae]
*Subulites (Subulites) subelongatus (Orbigny 1850)FB04 [=Macrocheilus subelongatusKC60, M. elongatus Emmons 1842 non Phillips 1841KC60, Subulites elongatusKC60]
*Type species of generic name indicated
References
[BRW98] Beesley, P. L., G. J. B. Ross & A. Wells (eds) 1998. Fauna of Australia vol. 5. Mollusca: The Southern Synthesis. Part A. Australian Biological Resources Study: Canberra.
[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.
[D94] Dzik, J. 1994. Evolution of ‘small shelly fossils’ assemblages of the early Paleozoic. Acta Palaeontologica Polonica 39 (3): 247–313.
[FB04] Frýda, J., & R. B. Blodgett. 2004. New Emsian (Late Early Devonian) gastropods from Limestone Mountain, Medfra B-4 quadrangle, west-central Alaska (Farewell Terrane), and their paleobiogeographic affinities and evolutionary significance. Journal of Paleontology 78 (1): 111–132.
[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.
[PE02] Pan, H.-Z., & D. H. Erwin. 2002. Gastropods from the Permian of Guangxi and Yunnan Provinces, south China. Journal of Paleontology 76 (Memoir 56): 1–49.
[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.
[W77] White, C. A. 1877. Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, by parties of the expeditions of 1871, 1872, 1873, and 1874. U.S. Geographical Surveys West of the One Hundredth Meridian 4 (1): 1–219, pls 1–21.