> Habitat & Distribution

Baker (1911) considered L. cubensis (in the narrow sense) “typically a tropical species.”  He cited quite a few records from Mexico, South America and the West Indies, but had very spotty data from the US: Florida, Georgia, Louisiana and Texas only.  Hubendick (1951) reported essentially the same range as Baker.  More recently it has become clear that L. cubensis ranges through the Piedmont and Coastal Plain of Georgia and the Carolinas, across North Alabama, and (counting all its likely synonyms) through the western United States from the Mississippi River to the Pacific Northwest (Alda et al. 2021).

Adult Lymnaea cubensis/viator are quite amphibious, apparently spending a substantial fraction of their lives grazing on mud above the water level.  Populations typically colonize ditches, vernal ponds, and the muddy margins of larger coastal plain rivers.  See my essay of 26May17 for more about the discovery of nine individual L. cubensis/viator transported into Louisiana by a migrating indigo bunting (Zenzal et al. 2017). FWGNA incidence rank I-3p, peripheral in our study area.

> Ecology & Life History

Lymnaea cubensis/viator is one of several smaller-bodied, amphibious (“fossarine”) lymnaeid taxa capable of serving as an intermediate host for trematodes causing fascioliasis in livestock, and rarely humans (Bargues et al. 2007).  This has attracted significant parasitological interest in the entire worldwide subgenus (or Genus) Galba.  For reviews of the large literature, see Mas-Coma and colleagues (2005, 2009).

As seems to be the case throughout the subgenus Galba, populations of L. cubensis/viator apparently reproduce primarily by self-fertilization (Lounnas et al. 2017).  For a review of the literature that has accumulated on the population genetics of the fossarine lymnaeids, see my essay of 22June21 from the link below.

It is possible that the worldwide research emphasis focused on the genetics of L. cubensis/viator populations has led to understudy of their ecology and life history.  Our very informal observations suggest that reproduction occurs year-round, that maturation is relatively rapid, and that fecundities are relatively large.  I am not aware of any actual data bearing on these questions, however.

Levri et al. (2014) analyzed growth rates and mortalities in laboratory populations identifed as being in the "Fossaria bulimoides group" as a control for experimental populations of Potamopyrgus antipodarum.

> Taxonomy & Systematics

Here in the USA, the taxonomy of L. cubensis (in its narrow sense) has historically been elaborately entangled with that of L. humilis, a similarly small, amphibious species more northern in its distribution.  Baker (1911) was the first to distinguish the two species by the number of cusps on their first marginal tooth, humilis with three and cubensis with two.  It seems likely, however, that the specimens in Thomas Say’s hand when he described humilis in 1822 were not tricuspid, but rather from a bicuspid population collected near Charleston, South Carolina.  For that reason, we recommend that the type locality for L. humilis be restricted to the Susquehanna River at Owego, NY, where populations are entirely tricuspid.  See my essay of 25June08 from the link below.

Baker’s original (1911) classification of the Lymnaeidae assigned cubensis (together with at least 60 – 80 other specific nomina) to a large, inclusive genus Galba (Schrank 1803), which he later (1928) subdivided and emended to Fossaria (Westerlund 1885).  Burch (1989) followed Baker (1928), gathering cubensis together with about a dozen other nominal species and subspecies of small, bicuspid lymnaeids into the genus Fossaria, subgenus Bakerilymnaea (Weyrauch).  Meanwhile, European consensus has continued to favor Galba.

Quite a few molecular phylogenies have been published in recent years involving L. humilis, L. cubensis, and many other lymnaeid taxa worldwide (e.g., Bargues & Mas-Coma 1997, Remigio 2002, Correa et al. 2010, 2011).  See my post to the FWGNA blog of 4June12 from the link below for a critical examination of this literature.  It continues to be our impression that the simple classification system of Hubendick (1951) fits the available data best. See my essay of 28Dec06 available from the link below for more.

More recently, large-scale surveys of morphological divergence, multiplex PCR genotype, and DNA sequence variation have thrown significantly more light on evolutionary relationships in the worldwide genus Galba (Alda et al. 2018, 2021).  Results confirm Hubendick’s hypothesis that all twelve of the Burch (1989) “Bakerilymnaea” species and subspecies are conspecific, and extend to include a long list of nominal species described from South and Central America as well.

The oldest name for the entire New World fauna of small, amphibious lymnaeids with bicuspid first marginal teeth now appears to be Lymnaea (Galba) viator, proposed by d’Orbigny (1835) for South American populations four years before Pfeiffer described L. cubensis.  Rather than running the risk of losing the large literature currently indexed under the name “cubensis” by synonymy, however, we have advocated identifying this group with the slash-name, “L. cubensis/viator.”  For more, see my essay of 6July21 from the link below.  

> Supplementary Resources [PDF]

• Lymnaea distribution in Atlantic drainages (2013)
• Lymnaea distribution in the Tennessee/Cumberland (2022)

> Essays

• See my post to the FWGNA blog of 28Dec06 for a review of The Classification of the Lymnaeidae.
• I reviewed the taxonomic histories of L. humilis and L. cubensis in my post of 25June08, entitled The Type Locality of Lymnaea humilis.  I have also made available photos comparing the radulae of these two very similar species.
• See my essay of 4June12 for a review of the large molecular phylogenetic literature that had accumulated on the Lymnaeidae as of that date, The Lymnaeidae 2012: Stagnalis yardstick.
• I revisited the systematics and taxonomy of L. cubensis and related species worldwide in my blog post of 7Aug12, "The Lymnaeidae 2012: Fossarine football."
• On 26May17 I shared the remarkable discovery of 9 adult L. cubensis transported in the breast feathers of a migrating indigo bunting.  See Freshwater Snails and Passerine Birds.
• I reviewed the entire worldwide fauna of crappy-little amphibious lymnaeids in 7June21, The American Galba and The French Connection.  That post featured a couple nice comparative figures of shell and radula.
• Reproductive mode was the focus of my essay of 22June21, The American Galba: Sex, Wrecks, and multiplex.  That post reviewed the new multiplex PCR test we developed to distinguish G. cubensis, G. truncatula, and G. schirazensis.
• In my post of 6July21 I reviewed the results of the big international research effort of Alda and colleagues (2021), Exactly 3ish American Galba.  There I proposed to conjoin Pfeiffer’s 1839 nomen with that of d’Orbigny’s 1835 to create the awkward/vivid Latinate amalgam, Lymnaea (Galba) cubensis/viator.

> References

Alda, Pilar, M. Lounnas, A.Vázquez, R. Ayaqui, M. Calvopiña, M. Celi-Erazo, R.T. Dillon Jr., L. González Ramírez,  E. Loker, J. Muzzio-Aroca, A. Nárvaez, O. Noya, A. Pereira, L. Robles, R. Rodríguez-Hidalgo, N. Uribe, P. David, P. Jarne, J-P. Pointier, & S. Hurtrez-Boussès (2021) Systematics and geographical distribution of Galba species, a group of cryptic and world-wide freshwater snails.  Molecular Phylogenetics and Evolution 157: 107035. [pdf] [html]
Alda, Pilar, M. Lounnas, A. Vázquez, R. Ayaqui, M. Calvopiña, M. Celi-Erazo, R. T. Dillon, Jr., P. Jarne, E. Loker, F. Pareja, J. Muzzio-Aroca, A. Nárvaez, O. Noya, L. Robles, R. Rodríguez-Hidalgo, N. Uribe, P. David, J-P. Pointier, & S. Hurtrez-Boussès (2018). A new multiplex PCR assay to distinguish among three cryptic Galba species, intermediate hosts of Fasciola hepatica.  Veterinary Parasitology 251: 101-105. [pdf] [html].
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