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Recent Species Name Changes in the European Lymnaeidae: Two Tales with Unhappy End?

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Recent Species Name Changes in the European Lymnaeidae: Two Tales with Unhappy End? See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/319722022 Recent species name changes in the European Lymnaeidae: Two tales with unhappy end? Article · September 2017 CITATIONS READS 0 75 1 author: Maxim Vinarski Saint Petersburg State University 121 PUBLICATIONS 589 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Origin of freshwater fauna in Iceland: Cryptic glacial refugia or postglacial founder events? View project Molecular phylogeny and historical biogeography of freshwater limpets (Gastropoda, Acroloxidae) View project All content following this page was uploaded by Maxim Vinarski on 14 September 2017. The user has requested enhancement of the downloaded file. Ruthenica, 2017, vol. 27, No. 4: 141-153. © Ruthenica, 2017 Published online September 8, 2017. http: www.ruthenica.com Recent species name changes in the European Lymnaeidae: two tales with unhappy end? Maxim V. VINARSKI1, 2 1 Laboratory of Macroecology and Biogeography of Invertebrates, Saint-Petersburg State University, 7/9 Universitetskaya Embankment, Saint-Petersburg, 199034, RUSSIAN FEDERATION 2 Museum of Siberian Aquatic Mollusks, Omsk State Pedagogical University, 14 Tukhachevskogo Emb., Omsk, 644099, RUSSIAN FEDERATION; E-mail: [email protected] ABSTRACT. Two doubtful cases of species name re- being obliged to obey the strict and internationally placements in the family Lymnaeidae Rafinesque, 1815 adopted rules of zoological nomenclature such as (pond snails) proposed in 1990–2000s are discussed. the ‘priority rule’ and similar ones [International These are: Radix labiata (Rossmäßler, 1835) vs. R. Commission on Zoological Nomenclature, 1999]. peregra (O.F. Müller, 1774), and Stagnicola fuscus (C. For a layperson, even for an educated one, this Pfeiffer, 1821) vs. S. vulneratus (Küster, 1862). It is permament re-shuffling of scientific names may shown that in both instances the name alterations were not based on the conclusive evidence and thus seem to seem absurd. Many professional biologists (not tax- be proposed without substantial reasons. I argue that onomists) also express their irritation at this habit, the name Radix peregra cannot be ruled out and re- and sometimes it is regarded as one of obvious placed by R. labiata. The type series of the latter has shortcomings of the contemporary (i.e. post-Lin- been identified in collection of the Natural History naean) systematics [Dammerman, 1949; Chaik- Museum of Vienna and it is shown that R. labiata is a ovsky, 2007]. Indeed, the taxonomic names alter- junior synonym of R. balthica (Linnaeus, 1758). The ations may influence a wide range of scientific lectotype of Limnaeus pereger var. labiatus Rossmäßler, activities, including conservation planning and Red 1835 is designated. The resurrection of the species Data lists compiling, comparative analyses in para- name Limnaeus fuscus (Pfeiffer, 1821) for application to sitology, data placement to GenBank and other pub- a certain species of Stagnicola is also very doubtful lic digital repositories of genetic information. De- since this name must be treated as a nomen dubium, and any taxonomic interpretation of it is inevitable based voted taxonomists usually see it as the “inevitable on more or less reliable hypothesis, not on the total evil” rather than a great imperfection [Berio, 1953], evidence. The replacement of S. vulneratus by its al- but even they demand that any species name chang- leged senior synonym adds little to our knowledge on es must be well-founded and based on as strong lymnaeid taxonomy and evolutionary relationships. It evidence as possible. Being short, we are permitted is desirable that the nomenclatorial principle of priority to change taxonomic names deliberately, but not in must not be applied to nomina dubia. a capricious and subjective manner. This long tirade is the preamble for the subse- quent and much more technical discussion of two Introduction concrete cases of recent name replacements in- volving two common European species of lymnaeid Taxonomic names, especially those applied to snails (family Lymnaeidae Rafinesque, 1815). The species (i.e. Latin binomens), are of great impor- family is thought to be presented in Europe by a few tance not only for biological systematics but also species [Jackiewicz, 1998a; Falkner et al., 2001; for virtually all branches of life sciences that require but see Kruglov, 2005], and its species composition a uniform and rigorous reference system for classi- has been extensively studied since Linnaeus [1758] fying and naming all creatures, great and small. The and Müller [1774]. However, even in such well- mnemonic significance of such a system is also known group of continental mollusks as European obvious and has repeatedly been stressed since the Lymnaeidae at least four species name replace- time of Linnaeus [1751]. On the other hand, prac- ments were adopted during the last two decades. ticing systematists have a “regrettable” habit to Two of these recent novelties were based on a change the names of species from time to time, thorough study of all possible evidence, including 142 M.V. Vinarski examination of the type series, and seem not to be problematic. The first of the two cases concerns the species Radix (or, alternatively, Lymnaea) ovata (Draparnaud, 1805) once thought to be among the most common and widely distributed lymnaeids in Europe and Northern Asia [Westerlund, 1885; Gey- er, 1927; Zhadin, 1952]. In the early 2000s, Falkner et al. [2001, 2002] proposed to replace the com- monly used name Radix ovata with the oldest avail- able one, R. balthica (L., 1758), described from the Gotland Island, Sweden. This replacement has been widely supported and it is almost universally ac- cepted today [Schniebs et al., 2011; Welter-Schult- es, 2012; Glöer, 2015]. A comparison of the neo- type of R. balthica (designated by Kruglov and FIG. 1. Shells of the type specimens of Radix. A. Radix Starobogatov, 1983) with the syntype of Limneus balthica, the neotype, ZIN No. 1, shell height = 9.8 mm. ovatus Draparnaud (Fig. 1) shows the correctness B. Radix ovata, a syntype, NHMW No. 14737, shell height = 21.7 mm. of this synonymization [see Vinarski, Eschner, 2016 for further details]. РИС. 1. Раковины типовых экземпляров двух видов Radix. The second case is that of the pair of species A. Radix balthica, неотип, ZIN No. 1, высота раковины Stagnicola occultus (Jackiewicz, 1959) – S. terebra = 9.8 mm. B. Radix ovata, синтип, NHMW No. 14737, высота раковины = 21.7 mm. (Westerlund, 1885). Having studied the type materi- als of the two taxa, Vinarski and Glöer (2008) demonstrated their conspecificity and proposed to 1. ZIN – Zoological Institute of the Russian Academy of use the second name as being the oldest available Sciences, Saint-Petersburg, Russia. one. Currently this species is placed to the genus 2. ZMUC – Zoological Museum, Copenhagen Univer- Ladislavella B. Dybowski, 1913 [see Vinarski, 2012 sitet, Denmark. 3. NHMW – Natural History Museum Vienna, Austria. for details]. 4. NMG – Natural History Museum Gothenburg, Swe- Two other recent cases of species name change den. in European Lymnaeidae, albeit supported by Euro- 5. ZMB – Natural History Museum Berlin, Germany. pean taxonomists [Glöer, 2002, 2015; Welter-Schult- 6. LMBI – Laboratory of Macroecology and Biogeogra- es, 2012], are much more problematic and should phy of Invertebrates, Saint-Petersburg State University, Rus- be discussed anew. These two instances are: sia. Radix labiata (Rossmäßler, 1835) vs. R. pere- During my study, I focused primarily on exami- gra (O.F. Müller, 1774) and Stagnicola fuscus (C. nation of samples having a historical value, i.e. Pfeiffer, 1821) vs. S. vulneratus (Küster, 1862). containing specimens identified by prominent zool- In my opinion, in both cases we are dealing with ogists of the past (O.F. Müller, C.A. Westerlund, E. the same problem – how to treat taxonomically the von Martens, S. Clessin and others). Doing so, I numerous nomina dubia produced intensively (and tried to ascertain the identity of taxonomic names unintentionally) by conchologists of the 18th–19th introduced by ancient conchologists that is not centuries, whose standards of species descriptions rarely unclear from the original descriptions. Exten- were very far from the modern ones. I will argue sive search through old literary sources was made that the objective decision concerning application possible by using two “material” (ZIN, NHMW) of a given nomen dubium to a certain species of and one “virtual” (Biodiversity Heritage Library, snails recognized by modern systematists is usually http://www.biodiversitylibrary.org/) libraries. impossible, and the rival interpretations of the same taxonomic name should be weighted in order to Results determine which one is more plausible and pro- motes the taxonomic stability rather than disturbs it. The nomina dubia in lymnaeid taxonomy Also, some objections against the most rigorous application of the nomenclatorial rule (or law) of The International Commission on Zoological priority are presented. Nomenclature [1999] defines the term “nomen du- bium” as a “name of unknown or doubtful applica- Material and methods tion”. Indeed, this definition is not very strict, and any decision about doubtfulness of one or another In the course of my taxonomic work on Eur- taxonomic name will inevitably be dependent on a asian Lymnaeidae, I examined numerous samples of taxonomist’s
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