The Family Mesodesmatidae (Mollusca: Bivalvia)

Signorelli, Javier

doi:10.1007/978-3-030-29097-9_6

Cited by 3 publications

(4 citation statements)

References 48 publications

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“…Mactra isabelleana (Fig. 5A–5C) has an aragonitic shell (Schroeder 1935; Signorelli 2019) and lives approximately between Cabo Frio, Rio de Janeiro State, Brazil, and San Antonio Oeste, Río Negro Province, Argentina. The oldest records of this species are from the Pleistocene and are frequently found in Holocene deposits (Camacho 1966; Martínez et al 2001, 2006).…”

Section: Methodsmentioning

confidence: 99%

“…Currently, M. isabelleana is among the most abundant bivalves in the unconsolidated subtidal bottoms of the Rio de la Plata estuary. It also lives on the marine Uruguayan Atlantic coast and is a marine euryhaline species (Figueiras and Sicardi 1969, 1979; Giberto et al 2004; Scarabino et al 2006; Signorelli 2019). In Portezuelo, 12 km westwards to Punta del Este, the species lives from 2 m depth (Demicheli 1986, 1987).…”

Section: Methodsmentioning

confidence: 99%

“…5D–5F) is a marine species with an aragonitic shell that is distributed from Espírito Santo (Brazil) to Península Valdés (Argentina) (Signorelli 2019). The oldest records of this species are from the Pleistocene, and it is also present in Holocene deposits (Camacho 1966, as M. patagonica ; Rojas et al 2018; Signorelli 2019). This species lives in subtidal sands and muddy sands (Figueiras and Sicardi 1969; Scarabino et al 2006).…”

Section: Methodsmentioning

confidence: 99%

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Millenial-Scale Time Averaging Inferred by Discolored Shells in Beach Death Assemblages

Martínez

Rojas

2023

Palaios

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Molluscan death assemblages occurring on present-day beaches frequently consist of secondary-colored shells, with yellow to brown and gray to black colors. It is hypothesized that this secondary coloration can be related to postmortem age and to conditions in the taphonomically active zone, altering shells to black and gray tones in reducing conditions, and then becoming yellowish or brownish in oxidizing settings. In this study, we assessed whether the variability in the degree of shell discoloration of two species of the infaunal bivalve Mactra collected in beach death assemblages from a temperate siliciclastic beach in Uruguay is a function of postmortem age, and whether this variability in discoloration can be linked to differences in their elemental composition, microstructure, and provenance. Although we did not detect any differences in mineralogy or elemental composition among shells differing in discoloration, we show that modern (younger than a century) beach shells are not secondary-colored, but have remained white, but some white shells are also old (millennial). In contrast, yellow and gray shells are consistently older than 1,000 years, indicating that this degree of discoloration requires millennial residence times in the taphonomically active zone and suggesting that discoloration can be used as an indicator of time averaging. Discolored shells are derived from subtidal death assemblages.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Millenial-Scale Time Averaging Inferred by Discolored Shells in Beach Death Assemblages

Martínez

Rojas

2023

Palaios

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“…Altogether, >100 genus-level names have been proposed within the family Mactridae, 79 of which are considered valid in the literature (Huber, 2010, 2015; Cosel and Gofas, 2019; Signorelli, 2019; Valentich-Scott et al, 2020; MolluscaBase, 2022; among others). However, only 45 genera are based on fossil specimens as type species.…”

Section: Introductionmentioning

confidence: 99%

Catalogue of fossil genera of Mactridae (Mollusca: Bivalvia)

Signorelli

2023

J. Paleontol.

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All genera based on fossil type species belonging to the family Mactridae are alphabetically listed in this work. The oldest records of the Mactridae come from Cretaceous deposits of North America. However, this group of bivalves has been worldwide recorded from the Paleogene and Neogene. An emended diagnosis for each genus is herein provided. In addition to that, type species, type localities, and occurrences are included. For each genus, a remarks section includes the most recent published taxonomic opinions. Nevertheless, in some cases, new taxonomic decisions based on morphological analysis of types have been taken. Genera based on extant type species are excluded from this work. Forty-five genera are listed herein and type material has been reproduced wherever possible. Ionesimactra nom. nov. is proposed as a replacement name for Caspimactra Ionesi (non Caspimactra Ali-Zade and Kabakova). This work constitutes the basis for future revisions related to fossil taxa of the family Mactridae from different regions. UUID: https://zoobank.org/ccc72130-4ea2-44a9-add9-51cfce58f2d5

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