A late Pleistocene gastropod fauna from the northern Caspian Sea with implications for Pontocaspian gastropod taxonomy

Neubauer, Thomas A.; Velde, Sabrina van de; Yanina, Т.А.; Wesselingh, Frank P.

doi:10.3897/zookeys.770.25365

Cited by 20 publications

(24 citation statements)

References 50 publications

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“…The genus concepts of Pontocaspian Pyrgulinae follow the revision of Neubauer et al (2018). Further change is expected in several of the keeled species here listed under ?…”

Section: Systematic Cataloguementioning

confidence: 83%

“…The drawings provided by Logvinenko and Starobogatov (1969) sketch a broad and conical shell. As such, it differs from the more elongate and ovoid Ulskiaulskii (Neubauer et al 2018). A revision is required to clarify its taxonomic status.…”

Section: Systematic Cataloguementioning

confidence: 91%

“…Currently, a number of taxonomic works is in progress on the endemic Pontocaspian hydrobiid groups, and some different insights on the genus-level classifications exist. Here, we adopt a conservative approach, mostly based on Neubauer et al (2018).…”

Section: Systematic Cataloguementioning

confidence: 99%

“…The distinction of the genera Caspia , Ulskia , and Clathrocaspia follows Neubauer et al (2018). The three taxa are differentiated based on details of the protoconch and the expression of teleoconch sculpture.…”

Section: Systematic Cataloguementioning

confidence: 99%

“…Much of the diversity in Pontocaspian mollusc groups is contained within a limited number of genera. Changing taxonomic approaches through time (e.g., Zhadin 1952, Logvinenko and Starobogatov 1969, Alexenko and Starobogatov 1987, Sitnikova and Starobogatov 1999, Munasypova-Motyash 2006a, b, Anistratenko 2007b, Kijashko in Bogutskaya et al 2013, Vinarski and Kantor 2016, Neubauer et al 2018) combined with large morphological variability and few diagnostic characters in certain groups, as well as the paucity of living material and partial disappearance of type material, has precluded critical reassessment of species boundaries and thus species richness. For the Caspian Sea, multiple efforts to collect fresh material in the past decade failed to produce sufficient living material to elucidate these taxonomic matters for most of the groups.…”

Section: Introductionmentioning

confidence: 99%

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Mollusc species from the Pontocaspian region – an expert opinion list

Fp¹,

Neubauer²,

Vv³

et al. 2019

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Defining and recording the loss of species diversity is a daunting task, especially if identities of species under threat are not fully resolved. An example is the Pontocaspian biota. The mostly endemic invertebrate faunas that evolved in the Black Sea – Caspian Sea – Aral Sea region and live under variable salinity conditions are undergoing strong change, yet within several groups species boundaries are not well established. Collection efforts in the past decade have failed to produce living material of various species groups whose taxonomic status is unclear. This lack of data precludes an integrated taxonomic assessment to clarify species identities and estimate species richness of Pontocaspian biota combining morphological, ecological, genetic, and distribution data. In this paper, we present an expert-working list of Pontocaspian and invasive mollusc species associated to Pontocaspian habitats. This list is based on published and unpublished data on morphology, ecology, anatomy, and molecular biology. It allows us to (1) document Pontocaspian mollusc species, (2) make species richness estimates, and (3) identify and discuss taxonomic uncertainties. The endemic Pontocaspian mollusc species richness is estimated between 55 and 99 species, but there are several groups that may harbour cryptic species. Even though the conservation status of most of the species is not assessed or data deficient, our observations point to deterioration for many of the Pontocaspian species.

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“…The genus concepts of Pontocaspian Pyrgulinae follow the revision of Neubauer et al (2018). Further change is expected in several of the keeled species here listed under ?…”

Section: Systematic Cataloguementioning

confidence: 83%

Section: Systematic Cataloguementioning

confidence: 91%

Section: Systematic Cataloguementioning

confidence: 99%

Section: Systematic Cataloguementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mollusc species from the Pontocaspian region – an expert opinion list

Fp¹,

Neubauer²,

Vv³

et al. 2019

Self Cite

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To be alive or not to be alive: Radiocarbon data provide new perspective on species diversity in the Caspian Sea

Clewing,

Albrecht,

Anistratenko

et al. 2024

Aquatic Conservation

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The Caspian Sea is undergoing a severe biodiversity crisis. However, estimates of current extinction rates are difficult to obtain due to the lack of reliable pre‐Anthropocene baseline data. For example, because the majority of endemic gastropod species was described from “fresh looking” shells, it remains unclear which species still existed prior to the Anthropocene. This study therefore used the species‐rich microgastropod family Hydrobiidae to assess the extent to which endemic species were collected alive during the Anthropocene. Literature and database searches were performed. In addition, 14C dating was conducted on “fresh looking” shells collected in the Caspian Sea during the last 150 years. The literature review revealed that 75% of the “recent” species are only known from empty shells and 25% were recorded with a soft body. The 14C data showed that all “recent” specimens examined had an age between 1624 cal BC and 1888 cal AD. Two species studied predate the beginning of the Anthropocene. Two other species potentially or likely existed during the Anthropocene. This suggests that the number of endemic species still present at the beginning of the Anthropocene is lower than previously thought. The data also suggest that there was a substantial loss of species between the late 18th century and the 1950s and that only two endemic hydrobiid species have recently been found alive. These findings further contribute to the notion of a severe biodiversity crisis in the Caspian Sea. For accurate estimates of current extinction rates of Caspian Sea gastropods, pre‐Anthropocene biodiversity data need to be further corroborated. Particularly, studies are required to clarify the taxonomic status of the dubious taxa and a possible “collection crisis” in the Caspian Sea due to decreasing sampling efforts in recent decades. In addition, comprehensive IUCN assessments are urgently required.

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Revealing morphological characteristics of Goniodorididae genera (Mollusca: Nudibranchia)

Paz-Sedano,

Díaz-Agras,

Gosliner

et al. 2021

Org Divers Evol

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Detailed knowledge of the anatomy of the species is an essential element in taxonomic studies, since it allows the comparison and differentiation of separate groups of taxa. It becomes especially important when considering type species, as the subsequent identification of the species that compose the taxa is based on its characteristics, considered common in the group. However, despite its relevance, there are still numerous species without detailed descriptions, being especially significant among invertebrates. The family Goniodorididae is a little-known group of nudibranchs that includes eight recognized genera: Okenia, Goniodoris, Ancula, Lophodoris, Spahria, Trapania, Goniodoridella and Murphydoris. Several of their species are not completely described, including type species, and the systematics of the family is still unclear. Here we study in detail the external morphology and internal anatomy of the type species of five of the eight Goniodorididae genera using microcomputed tomography and scanning electron microscopy. We include the species Okenia elegans, Goniodoris nodosa, Ancula gibbosa, Goniodoridella savignyi and Murphydoris singaporensis as well as one species of Trapania, T. graeffei. We describe for the first time the detailed internal anatomy of the type species Goniodoridella savignyi. The diagnostic features of each genus are compared, and a preliminary framework is shown to clarify their systematics and identifications.

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A late Pleistocene gastropod fauna from the northern Caspian Sea with implications for Pontocaspian gastropod taxonomy

Cited by 20 publications

References 50 publications

Mollusc species from the Pontocaspian region – an expert opinion list

Mollusc species from the Pontocaspian region – an expert opinion list

To be alive or not to be alive: Radiocarbon data provide new perspective on species diversity in the Caspian Sea

Revealing morphological characteristics of Goniodorididae genera (Mollusca: Nudibranchia)

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