Data from: From living to fossil: Parasitological evidence in modern and Pleistocene shells of the gastropod Zidona dufresnii
Data files
May 23, 2026 version files 3.63 MB
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Marinisupplementappendice1.pdf
1.42 MB
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Marinisupplementappendice2.pdf
944.95 KB
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Marinisupplementappendice3.pdf
568.40 KB
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Marinisupplementfigure1.png
625.27 KB
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Marinisupplementtable1.csv
59.23 KB
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README.md
6.88 KB
Abstract
This dataset provides supplementary material and raw data for the article "From living to fossil: parasitological evidence in modern and Pleistocene shells of the gastropod Zidona dufresnii". The repository contains five files supporting the study of biotic interactions and morphological anomalies in the Coastal Plain of Rio Grande do Sul (PCRS), Brazil. The data includes one tabular dataset (.csv) detailing the quantification of bioerosional traces and malformations in Zidona dufresnii shells, and one graphic file (.png) illustrating the relationship between shell dimensions (height and width) and bioerosion occurrences. Additionally, three text documents (.pdf) are provided: the official geochronological dating certificates, the complete output of the statistical analyses performed, and a comprehensive literature compilation of all dated materials from the PCRS. The primary shell data were obtained through field collections at Cassino beach, followed by detailed taphonomic and morphological analysis using a stereomicroscope. These files serve as a baseline resource for researchers investigating Quaternary paleoecology, paleoparasitism, and taphonomy in the South Atlantic.
Dataset DOI: 10.5061/dryad.j3tx95xwg
This README file was generated on May 02, 2026 by Keila Marini dos Santos.
Description of the data and file structure
Corresponding Author Information:
- Name: Keila Marini dos Santos
- Institution: Federal University of Rio Grande (FURG)
- Program: Oceanology Graduate Program (PPGO)
- Address: Rio Grande, RS, Brazil
- Email: marinikeila2@gmail.com
Date of Data Collection: Jun 2025 – Jul 2026
Geographic Location: Coastal Plain of Rio Grande do Sul (PCRS), Brazil. Cassino beach.
Funding Information: Coordination for the Improvement of Higher Education Personnel (CAPES).
DESCRIPTION OF EXPERIMENTAL EFFORTS
The data was collected to investigate and distinguish in vivo biological interactions (e.g., paleoparasitism) from post-mortem taphonomic processes (e.g., bioerosion) in Quaternary marine mollusks Zidona dufresnii from the Coastal Plain of Rio Grande do Sul, Brazil. The experimental efforts involved the systematic field collection of shell assemblages at Cassino beach, followed by laboratory screening. Individual shells were examined macro- and microscopically to identify and classify traces, utilizing the presence of biological responses from the host (such as shell repair or blisters) as the primary criterion to confirm in vivo interactions. Additionally, radiocarbon dating was conducted to establish a precise chronological framework for the studied assemblages.
FILE OVERVIEW
The dataset contains five files:
- Filename: Marinisupplementappendice1
- Description: This document contains the complete outputs and summaries of the statistical analyses performed in this study.
- Filename: Marinisupplementappendice2
- Description: Compilation of dated materials from Coastal Plain of Rio Grande do Sul (CPRS) and shallow platform. The ages were modeled with the same parameters as this study, aiming at a possible comparison.
- Filename: Marinisupplementappendice3
- Description: Original documentation and certificates for radiocarbon (C14) dating performed on the samples.
- Filename: Marinisupplementfigure1
- Description: This figure show de relationship between size and malformations in shells.
- Filename: Marinisupplementtable1.csv
- Description: Raw data of ecological interactions (paleoparasitism and bioerosion) analyzed in marine mollusk shells (including Zidona dufresnii). Includes measurements, trace classification, and observed biological responses.
DATA DICTIONARY (For Raw Data Table)
- General Shell Characteristics:
- ID: Unique identifier for each shell specimen.
- Color: Description or classification of the shell's color.
- Ornamentation: Presence, absence, or type of shell ornamentation.
- Brightness: Description of the shell's luster or surface brightness.
- Trace Fossils / Ichnotaxa: (Binary data: 1 = Presence; 0 = Absence)
- Caulostrepis: Boring trace typically associated with polychaetes.
- Entobia: Boring trace produced by clionaid sponges.
- Finichnus: Attachment or bioerosion trace.
- Pennatichnus: Bioerosion trace.
- Iramena: Bioerosion trace typically associated with ctenostome bryozoans.
- Gastrochaenolite: Boring trace (Gastrochaenolites), typically produced by bivalves.
- Oichnus: Circular to subcircular predatory drill holes.
- Maeandropolydora: Winding cylindrical galleries typically produced by polychaetes.
- Podichnus: Attachment trace. Biological Responses / Host Reactions: (Binary data: 1 = Presence; 0 = Absence of the specific morphological response)
- Pearl: Pearl formation.
- Blister: Blister-like localized calcification covering an irritant or boring.
- Sheet: Sheet-like internal calcification/repair.
- Pits: Small depressions or pitting on the inner surface.
- Verrucose: Wart-like localized calcification/protrusion.
- Needle: Needle-like internal calcified structure.
- Igloo: Igloo-like calcification, typically enclosing a borer.
Files and variables
File: Marinisupplementappendice1.pdf
Description: This document contains the complete outputs and summaries of the statistical analyses performed in this study.
File: Marinisupplementfigure1.png
Description: This figure show de relationship between size and malformations in shells.
File: Marinisupplementappendice2.pdf
Description: Compilation of dated materials from Coastal Plain of Rio Grande do Sul (CPRS) and shallow platform. The ages were modeled with the same parameters as this study, aiming at a possible comparison.
File: Marinisupplementappendice3.pdf
Description: Original documentation and certificates for radiocarbon (C14) dating performed on the samples.
File: Marinisupplementtable1.xlsx
Description: Figure generated using OxCal software (v.4.4) showing the calibration and compilation of dating results for the Coastal Plain of Rio Grande do Sul samples.
Variables
- General Shell Characteristics:
- ID: Unique identifier for each shell specimen.
- Color: Description or classification of the shell's color.
- Ornamentation: Presence, absence, or type of shell ornamentation.
- Brightness: Description of the shell's luster or surface brightness.
- Trace Fossils / Ichnotaxa: (Binary data: 1 = Presence; 0 = Absence)
- Caulostrepis: Boring trace typically associated with polychaetes.
- Entobia: Boring trace produced by clionaid sponges.
- Finichnus: Attachment or bioerosion trace.
- Pennatichnus: Bioerosion trace.
- Iramena: Bioerosion trace typically associated with ctenostome bryozoans.
- Gastrochaenolite: Boring trace (Gastrochaenolites), typically produced by bivalves.
- Oichnus: Circular to subcircular predatory drill holes.
- Maeandropolydora: Winding cylindrical galleries typically produced by polychaetes.
- Podichnus: Attachment trace. Biological Responses / Host Reactions: (Binary data: 1 = Presence; 0 = Absence of the specific morphological response)
- Pearl: Pearl formation.
- Blister: Blister-like localized calcification covering an irritant or boring.
- Sheet: Sheet-like internal calcification/repair.
- Pits: Small depressions or pitting on the inner surface.
- Verruga: Wart-like localized calcification/protrusion.
- Agulha: Needle-like internal calcified structure.
- Igloo: Igloo-like calcification, typically enclosing a borer.