Diversity and systematics of philinid snails (Gastropoda: Cephalaspidea) in West Africa with remarks on the biogeography of the region

Malaquias, Manuel António E.; Ohnheiser, Lena Tina; Oskars, Trond Roger; Willassen, Endre

doi:10.1111/zoj.12478

Cited by 9 publications

(5 citation statements)

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“…In order to extend the knowledge of molluscan diversity, combined taxonomic and molecular efforts are especially needed in understudied and remote areas, such as the deep sea or some Antarctic regions. During recent years, work on the systematics of philinoid snails from around the world, from the Mediterranean Sea (Crocetta and Tringali, ) to the Atlantic (Ohnheiser and Malaquias, ; Malaquias et al., ) and Pacific Oceans (Price et al., ; Gonzales and Gosliner, ; Valdés et al., ) has revealed new and often pseudocryptic lineages, hence increasing the diversity of these molluscs. Most philinoid representatives were historically included in the family Philinidae Gray, 1850 (1815), but the molecular phylogeny of Oskars et al.…”

Section: Introductionmentioning

confidence: 99%

“…() hypothesized the division into four families, which are not even sister lineages, namely Philinidae s.s., Laonidae Pruvot‐Fol, 1954, Philinorbidae Oskars et al., ; and the undesignated Philinidae clade 4. Part of this systematic conundrum was due to the external morphological convergence of the species probably resulting from their infaunal and digging habits (Malaquias et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Unmasking Antarctic mollusc lineages: novel evidence from philinoid snails (Gastropoda: Cephalaspidea)

2019

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Since its introduction, the genus Philine has epitomized numerous mollusc snails with strong morphological convergence. Recently, a molecular analysis including a wide taxon sampling split this group into four non‐sister families. Although they are especially diverse in cold and deep waters, no comprehensive studies are available for the Antarctic counterparts. Here, our morpho‐anatomical and molecular data suggest major changes in the systematics of the group. From the eight known species, two are synonymized, Antarctophiline amoena with A. alata, and A. gouldi with A. gibba, and two are transferred to the genus Antarctophiline, namely A. apertissima comb.n. and A. falklandica comb.n. Two new species are described, A. easmithi sp.n. and A. amundseni sp.n. from different depths in the eastern Weddell Sea. The elusive P. antarctica from the Ross Sea was found in the Weddell Sea and Waegelea gen.n. is erected to place this species. Both phylogenetic and morphological data support the erection of Antarctophilinidae fam.n. to embrace most of the Philinoidea species described in the Southern Ocean. Only two species of Philinidae are found in Antarctic waters, Spiraphiline bathyalis gen. et sp.n. from bathyal depths in the Weddell Sea and S. kerguelensis comb.n. from the Kerguelen Islands. In light of the new data provided for all described species and the phylogenetic framework proposed herein, we briefly discuss the diversification and biogeographical patterns of Antarctic philinoid snails. Overall, antarctophilinid species seem to have restricted and grossly nonoverlapping distributions suggesting allopatric speciation connected possibly to geographical or bathymetric isolation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unmasking Antarctic mollusc lineages: novel evidence from philinoid snails (Gastropoda: Cephalaspidea)

2019

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“…Both conchological and internal features were recommended by authors to substantiate the species status of genetically identified taxa (e.g., Laming et al, 2020 ; Magnúsdóttir et al, 2019 ; Malaquias et al, 2016 ). Cryptic species sensu stricto ( n = 7) could not be distinguished by morphology.…”

Section: Discussionmentioning

confidence: 99%

How we study cryptic species and their biological implications: A case study from marine shelled gastropods

Shin,

Allmon

2023

Ecology and Evolution

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Methodological and biological considerations are intertwined when studying cryptic species. A potentially large component of modern biodiversity, the frequency of cryptic species among taxonomic groups is not well documented. The term “cryptic species” is imprecisely used in scientific literature, causing ambiguity when interpreting their evolutionary and ecological significance. This study reviews how cryptic species have been defined, discussing implications for taxonomy and biology, and explores these implications with a case study based on recently published literature on extant shelled marine gastropods. Reviewed gastropods were recorded by species. Records of cryptic gastropods were presented by authors with variable levels of confidence but were difficult to disentangle from inherent biases in the study effort. These complexities notwithstanding, most gastropod species discussed were not cryptic. To the degree that this review's sample represents extinct taxa, the results suggest that a high proportion of shelled marine gastropod species are identifiable for study in the fossil record. Much additional work is needed to provide a more adequate understanding of the relative frequency of cryptic species in shelled marine gastropods, which should start with more explicit definitions and targeted case studies.

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“…Taxonomic descriptions of the undescribed species, as well as the validity of certain synonymized taxa within the A. alata species complex ( Philine gouldi Doello-Jurado, 1918, and P. amoena Thiele, 1925), will follow in a separate manuscript. Ecological restrictions to bottom-dwelling habitats may be a driver for the morphological convergence in species of Philinoidea 29 , 30 , 37 . Here, genomic data have enhanced the phylogenetic resolution of Antarctophilinidae species obtained through Sanger analysis, particularly for less diverged species, an approach that has been previously applied only to a handful of Antarctic samples (e.g., Ref.…”

Section: Discussionmentioning

confidence: 99%

An approach using ddRADseq and machine learning for understanding speciation in Antarctic Antarctophilinidae gastropods

Moles

Derkarabetian

Schiaparelli

et al. 2021

Sci Rep

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Sampling impediments and paucity of suitable material for molecular analyses have precluded the study of speciation and radiation of deep-sea species in Antarctica. We analyzed barcodes together with genome-wide single nucleotide polymorphisms obtained from double digestion restriction site-associated DNA sequencing (ddRADseq) for species in the family Antarctophilinidae. We also reevaluated the fossil record associated with this taxon to provide further insights into the origin of the group. Novel approaches to identify distinctive genetic lineages, including unsupervised machine learning variational autoencoder plots, were used to establish species hypothesis frameworks. In this sense, three undescribed species and a complex of cryptic species were identified, suggesting allopatric speciation connected to geographic or bathymetric isolation. We further observed that the shallow waters around the Scotia Arc and on the continental shelf in the Weddell Sea present high endemism and diversity. In contrast, likely due to the glacial pressure during the Cenozoic, a deep-sea group with fewer species emerged expanding over great areas in the South-Atlantic Antarctic Ridge. Our study agrees on how diachronic paleoclimatic and current environmental factors shaped Antarctic communities both at the shallow and deep-sea levels, promoting Antarctica as the center of origin for numerous taxa such as gastropod mollusks.

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Diversity and systematics of philinid snails (Gastropoda: Cephalaspidea) in West Africa with remarks on the biogeography of the region

Cited by 9 publications

References 48 publications

Unmasking Antarctic mollusc lineages: novel evidence from philinoid snails (Gastropoda: Cephalaspidea)

Unmasking Antarctic mollusc lineages: novel evidence from philinoid snails (Gastropoda: Cephalaspidea)

How we study cryptic species and their biological implications: A case study from marine shelled gastropods

An approach using ddRADseq and machine learning for understanding speciation in Antarctic Antarctophilinidae gastropods

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