FWGNA Volume 5, by Dillon, Kohl, Winters, Pyron, Reeves, Watters, Cummings, Bailey and Whitman [1], reports the scientific results of a freshwater gastropod survey covering all or part of 14 U.S. states, a total study area of over 200,000 square miles. Our database of 9,370 records, sampled from approximately 4,250 distinct sites, was drawn from museums (24%), state natural resource agencies (34%), and personal collections.
We document 80 species and 19 subspecies of freshwater gastropods in this malacologically rich region. For each we provide:
- A dichotomous key for identification.
- Full-color figures.
- Range maps at county scale.
- Notes on habitat, ecology, life history and reproductive biology.
- Systematic and taxonomic updates to modern standards.
Three new species of cave-dwelling hydrobioid snails: Fontigens hershleri, F. benfieldi, and F. davisi, are described in the appendix [2].
Our complete FWGNA database, updating Atlantic drainage records and combining them with our fresh data from the interior, now comprises 22,044 records documenting 107 species of freshwater gastropods, with 21 subspecies. In Volume 5 we offer a new continent-scale biogeographic analysis, dividing records into North Atlantic, South Atlantic, Ohio, and Tennessee/Cumberland subsets. Our analysis suggests that natural selection has been more important in the evolution of freshwater pulmonate snails than gene flow restriction, but that gene flow restriction has been more important in the evolution of freshwater prosobranch snails than natural selection.
Our modern understanding of the taxonomy and systematics of the North American freshwater gastropod fauna is a function of both the natural history of the vast rivers, lakes and streams through which that diverse fauna has evolved, and the human history of the biologists who have come behind, struggling to catalog the biodiversity as it has elaborated before their eyes. In FWGNA Volume 6 [3] we collect 32 essays, originally published on the present blog 2019 – 2023, exploring the relationship between natural history, human history, and the evolutionary models we impose today upon the pleurocerid snails of the American interior, and upon the hydrobioid snails, broadly understood.
Featured topics include intrapopulation gene flow, barriers to dispersal, character phase disequilibrium, and speciation. Special attention is called to the phenomena of cryptic phenotypic plasticity and mitochondrial superheterogeneity, both of which were introduced in Volume 3 of the present series (2019). Along the way we meet Professor Gerard Troost, who was twice-captured and ransomed by privateers, Captain S. S. Lyon, who singlehandedly saved the Union command of George W. Morgan in 1862, and Dr. Isaac Lea, the Nestor of American Naturalists, who drives us nuts. Together these 32 studies comprise an essential companion to the scientific results of the 14-state survey of the freshwater gastropod fauna The Ohio, Cumberland, and Tennessee River systems published in Volume 5.
Collected in FWGNA Volume 7 [4] are 36 essays, originally published in the genre-defining artistic universe known as the FWGNA Blog, exploring freshwater gastropod biology in the modern milieu. Our focus here is on the larger prosobranchs – the viviparids and the ampullariid “mystery snails” – as well as on the familiar pulmonate snails of the hobbyist aquarium and the lab bench.
Reproductive allocation and the species concept, especially as applied to asexually-reproducing populations, emerge as primary themes, together with the omnipresent phenomenon of phenotypic plasticity. And along the way we’ll check in with Gary, a pet mystery snail, who doesn’t smell so good. The essays collected here will be an essential companion both to the Volume 1 results of the FWGNA surveys of Atlantic drainages published in 2019, and to the results of the Volume 5 Ohio drainage surveys published alongside.
The retail price of these three indispensable volumes, if purchased separately, would be $56.00 + $48.89 + $53.79 = $158.68. But we have worked out a special deal with the print shop for friends of the FWGNA Project. Go directly to my author page on the printer’s website, link above. Add each of the three new titles [5] separately to your cart and proceed to checkout. At the checkout page you will find a box to enter a “coupon code.” Apply the coupon code FWGNA3 to each of the three volumes. This will discount your price to $99.95 for the set. A bargain!
Notes
[1] Dillon, R.T. Jr., M. Kohl, R. Winters, M. Pyron, W.K. Reeves, G.T. Watters, K. Cummings, J. Bailey, & M. Whitman (2023a) Ohio, Cumberland, and Tennessee River Systems. Freshwater Gastropods of North America, Volume 5. FWGNA Press, Charleston, SC. 315 pp.
[2] Dillon, R.T., Jr., T.E. Malabad, W.D. Orndorff & H-P. Liu (2023) Three new Fontigens (Caenogastropoda: Fontigentidae) from caves in the Appalachian Ridge and Valley Province, Virginia. Pp. 283 - 306 in Dillon, R.T., Jr. et al. The Freshwater Gastropods of North America Volume V: Ohio, Cumberland, and Tennessee River Systems. FWGNA Press, Charleston. [pdf]
[3] Dillon, R.T., Jr. (2023b) Yankees at The Gap, and Other Essays. Freshwater Gastropods of North America Volume 6. FWGNA Press, Charleston, SC. 306 pp.
[4] Dillon, R.T., Jr. (2023c) Collected in Turn One, and Other Essays. Freshwater Gastropods of North America Volume 7. FWGNA Press, Charleston, SC. 345 pp.
[5] Oh, and the special deal we worked out for Volumes 1 – 4 back in 2019 is still valid. If you follow the entire procedure outlined above for Volumes 1 – 4 and add the coupon code FWGNA4, you will receive a discounted price of $99.95 for that set as well.