Prionoglossa

Belongs within: Heterobranchia.
Contains: Orbitestellidae.

The Prionoglossa are a group of minute, low-spired or planispiral marine molluscs. Members are simultaneous hermaphrodites that perform internal fertilisation despite the absence of a true penis. They include the Omalogyridae which have a greatly reduced radula consisting of only a single rachidian tooth per row. The Stuoraxidae are similar fossil species known from the Permian and Triassic (Bandel 2002).

<==PrionoglossaGS75
    |--OmalogyroideaS11
    |    |--StuoraxidaeBR17
    |    |    |--Alexogyra Bandel 1996B02
    |    |    `--Stuoraxis Bandel 1994BR05
    |    |         |--*S. lehmanni Bandel 1996NPE02
    |    |         |--S. panhuazhangi Bandel 2002B02 [=Straparollus minutus Pan & Erwin 2002 (preoc.)B02, Stu. minutusFB04]
    |    |         `--S. parvula Gründel 1998B02
    |    `--Omalogyridae [Homalogyridae]S11
    |         |--Omalogyra Jeffreys 1859 [=Homalogyra Jeffreys 1867]BR17
    |         |    |--*O. atomus (Philippi 1841) [=Truncatella atomus]BR17
    |         |    |--O. fusca Suter 1908P61
    |         |    |--O. fuscopardalis Rolán 1992BC01
    |         |    |--O. nitidissimaP61
    |         |    |--‘Homalogyra’ rotaN79
    |         |    `--O. zebrina Rolán 1992BC01
    |         `--AmmoniceraS11
    |              |--A. albospeciosa Rolán 1992BC01
    |              |--A. burnayi Rolán 1991BC01
    |              |--A. circumcincta Rolán 1992BC01
    |              |--A. familiaris Rolán 1992BC01
    |              |--A. lineofuscata Rolán 1992BC01
    |              |--A. minortalis Rolán 1992BC01
    |              |--A. oteroi Rolán 1991BC01
    |              |--A. plana Simone 1997S11
    |              `--A. sculpturata Rolán 1992BC01
    `--OrbitestelloideaBR17
         |--OrbitestellidaeS11
         `--Xylodiscula Marshall 1988BR05 [XylodisculidaeBR17]
              `--*X. vitrea Marshall 1988BR17

*Type species of generic name indicated

References

[B02] Bandel, K. 2002. About Heterostropha (Gastropoda) from the Carboniferous and Permian. Mitteilungen des Geologisch-Paläontologischen Institutes der Universität Hamburg 86: 45–80.

[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.

[BC01] Boyko, C. B., & J. R. Cordeiro. 2001. Catalog of Recent type specimens in the Division of Invertebrate Zoology, American Museum of Natural History. V. Mollusca, part 2 (class Gastropoda [exclusive of Opisthobranchia and Pulmonata], with supplements to Gastropoda [Opisthobranchia], and Bivalvia). Bulletin of the American Museum of Natural History 262: 1–170.

[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.

[GS75] Golikov, A. N., & Y. I. Starobogatov. 1975. Systematics of prosobranch gastropods. Malacologia 15 (1): 185–232.

[N79] Norman, A. M. 1879. The Mollusca of the fiords near Bergen, Norway. Journal of Conchology 2: 8–77.

[NPE02] Nützel, A., Pan H.-Z. & D. H. Erwin. 2002. New taxa and some taxonomic changes of a latest Permian Gastropod fauna from south China. Documenta Naturae 145: 1–10.

[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4^th 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.