Lower Heterobranchia

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Lower Heterobranchia
Architectonica sp. (Marine snail).jpg
A live individual of Architectonica perspectiva
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia
informal group Lower Heterobranchia


Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, (marine gastropod mollusks) within the clade Heterobranchia. Although the great majority of Lower Heterobranchs are indeed marine, a few have succeeded in making the transition to freshwater.


The shell shapes in this group are typically those that are seen in the sundial, pyramid, rissoella and orbitestellid families of snails.[1]


2005 taxonomy[edit]

In the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005,[2] the Lower Heterobranchia is an Informal Group. Superfamilies within the Lower Heterobranchia include:

(Taxa that are exclusively fossil are indicated with a dagger †)

For a more detailed taxonomy see: Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)#Informal group "Lower Heterobranchia" (= Allogastropoda)

2010 taxonomy[edit]

Jörger et al. (2010)[3] have redefined major groups within the Heterobranchia: they moved Glacidorboidea and Pyramidelloidea to Panpulmonata.[3]

2014 taxonomy[edit]

Wägele et al. (2014):[4] moved Rissoelloidea and Acteonoidea from Lower Heterobranchia to Euthyneura.

2016 taxonomy[edit]

Kano et al. (2016):[5] moved Ringiculoidea from Lower Heterobranchia to Euthyneura.

So the following taxa remain within the Lower Heterobranchia:


  1. ^ http://www.molluscsoftasmania.net/Subclass%20pages/Heterobranchia.html
  2. ^ Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. Hackenheim, Germany: ConchBooks. 47 (1-2): 1–397. ISBN 3-925919-72-4. ISSN 0076-2997. 
  3. ^ a b Jörger K. M., Stöger I., Kano Y., Fukuda H., Knebelsberger T. & Schrödl M. (2010). "On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia". BMC Evolutionary Biology 10: 323. doi:10.1186/1471-2148-10-323.
  4. ^ Wägele H., Klussmann-Kolb A., Verbeek E. & Schrödl M. (2014). "Flashback and foreshadowing—a review of the taxon Opisthobranchia". Organisms Diversity & Evolution 14(1): 133–149. doi:10.1007/s13127-013-0151-5
  5. ^ Kano, Yasunori; Brenzinger, Bastian; Nützel, Alexander; Wilson, Nerida G.; Schrödl, Michael (2016-08-08). "Ringiculid bubble snails recovered as the sister group to sea slugs (Nudipleura)". Scientific Reports. 6: 30908. doi:10.1038/srep30908. ISSN 2045-2322. Retrieved 2017-05-12.