This dataset compiles occurrence records of the polychaete Perinereis falklandica (Ramsay, 1914) (Annelida: Nereididae) from South America, including both the Southeastern Pacific and Southwestern Atlantic coasts. The dataset integrates primary data from recent field collections in Peru and compiled bibliographic records from Chile, the Falkland Islands (Malvinas), and Tristan da Cunha.
The dataset contains 70 occurrence records. Of these, 14 correspond to newly collected material from the Peruvian coast, representing the first confirmed record of P. falklandica from Peruvian waters. These specimens were collected between December 2024 and February 2025 from rocky intertidal macroalgal turfs. The remaining 56 records were sourced from published literature, with collection dates ranging from 1902 to 2019, from Chile, the Falkland Islands (Malvinas), and Tristan da Cunha (Atlantic Ocean).
Each record includes taxonomic identification, geographic coordinates (WGS84), collection date, habitat description, and catalog number for new specimens. This dataset extends the known northern distribution limit of P. falklandica to approximately 15°S in the Southeastern Pacific (Atiquipa, Peru).
","language":"eng","citation":{"text":"Tejada-Pérez C A (2026). Occurrence dataset of Perinereis falklandica (Annelida: Nereididae) from the Southeastern Pacific and Southwestern Atlantic, including the first record from Peru. Check List. Metadata dataset https://doi.org/10.15468/ax8s9n accessed via GBIF.org on 2026-10-14.","citationProvidedBySource":false},"contactsCitation":[{"key":6993366,"abbreviatedName":"Tejada-Pérez C A","firstName":"Cristian A.","lastName":"Tejada-Pérez","roles":["ORIGINATOR"],"userId":[]}],"lockedForAutoUpdate":false,"createdBy":"03433ccd-5166-4730-94a9-e06ec25d1a72","modifiedBy":"crawler.gbif.org","created":"2026-04-27T11:37:50.578+00:00","modified":"2026-04-30T10:02:33.483+00:00","contacts":[{"key":6993366,"type":"ORIGINATOR","primary":true,"userId":[],"firstName":"Cristian A.","lastName":"Tejada-Pérez","position":[],"email":[],"phone":[],"homepage":[],"organization":"Universidad Nacional de San Agustín de Arequipa","address":[],"city":"Arequipa","province":"Arequipa","country":"PE","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-04-30T10:02:33.465+00:00","modified":"2026-04-30T10:02:33.465+00:00"},{"key":6993367,"type":"ADMINISTRATIVE_POINT_OF_CONTACT","primary":true,"userId":[],"firstName":"Cristian A.","lastName":"Tejada-Pérez","position":[],"email":[],"phone":[],"homepage":[],"organization":"Universidad Nacional de San Agustín de Arequipa","address":[],"city":"Arequipa","province":"Arequipa","country":"PE","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-04-30T10:02:33.466+00:00","modified":"2026-04-30T10:02:33.466+00:00"}],"endpoints":[{"key":1268350,"type":"EML","url":"https://ipt.pensoft.net/eml.do?r=perinereisfalklandica","createdBy":"03433ccd-5166-4730-94a9-e06ec25d1a72","modifiedBy":"03433ccd-5166-4730-94a9-e06ec25d1a72","created":"2026-04-27T11:37:51.637+00:00","modified":"2026-04-27T11:37:51.637+00:00","machineTags":[]}],"machineTags":[{"key":33142145,"namespace":"crawler.gbif.org","name":"crawl_attempt","value":"21","createdBy":"crawler.gbif.org","created":"2026-10-12T01:51:39.388+00:00"}],"tags":[],"identifiers":[{"key":467521,"type":"URL","identifier":"https://ipt.pensoft.net/resource?r=perinereisfalklandica","createdBy":"crawler.gbif.org","created":"2026-04-30T10:02:33.467+00:00","primary":false}],"comments":[],"bibliographicCitations":[],"curatorialUnits":[],"taxonomicCoverages":[],"geographicCoverages":[{"description":"The dataset covers localities along the Southeastern Pacific coast of South America (Peru and Chile), the Southwestern Atlantic (Falkland Islands / Malvinas), and a single record from Tristan da Cunha in the central South Atlantic Ocean.\n\nIn Peru, records are from the Arequipa region, ranging from Atiquipa (15.84°S) to Punta de Bombón (17.26°S). In Chile, records span from Arica (18.48°S) to Isla Hoste (54.93°S). The Falkland Islands records are from East and West Falkland. One record is from Tristan da Cunha (37.11°S, 12.28°W).","boundingBox":{"minLatitude":-58.078,"maxLatitude":-8.407,"minLongitude":-96.328,"maxLongitude":11.25,"globalCoverage":false}}],"temporalCoverages":[],"keywordCollections":[{"thesaurus":"n/a","keywords":["Polychaeta","range extension","northernmost limit","Checklist","southeastern Pacific","macroalgal turf","Humboldt Current","first record","Peru","Perinereis falklandica","Nereididae","intertidal"]},{"thesaurus":"GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml","keywords":["Checklist"]}],"project":{"title":"First record of Perinereis falklandica (Ramsay, 1914) (Annelida: Nereididae) from Peru and its northernmost range extension in the Southeastern Pacific","contacts":[{"type":"AUTHOR","primary":false,"userId":["https://orcid.org/0000-0003-3321-9992"],"firstName":"Cristian A.","lastName":"Tejada-Pérez","position":[],"email":[],"phone":[],"homepage":[],"address":[]},{"type":"AUTHOR","primary":false,"userId":["https://orcid.org/0009-0005-8398-0685"],"firstName":"Sandra","lastName":"Sampértegui","position":[],"email":[],"phone":[],"homepage":[],"address":[]},{"type":"AUTHOR","primary":false,"userId":["https://orcid.org/0000-0002-0576-8647"],"firstName":"Nicolás","lastName":"Rozbaczylo","position":[],"email":[],"phone":[],"homepage":[],"address":[]},{"type":"AUTHOR","primary":false,"userId":["https://orcid.org/0000-0001-6385-1599"],"firstName":"Oscar","lastName":"Díaz-Díaz","position":[],"email":[],"phone":[],"homepage":[],"address":[]}],"awards":[],"studyAreaDescription":"The study area covers the southern coast of Peru, specifically the intertidal zone from approximately 15°50'S to 18°00'S. Field collections were conducted at several localities including in Arequipa, southern Peru. The geographic coverage also includes compiled bibliographic records from Chile (18°28'S to southern Chile), the Falkland Islands (Malvinas), and Tristan da Cunha (Atlantic Ocean).","designDescription":"Field collections were conducted during low tides at several localities in southern Peru between 2021, 2024 and 2025, focusing on rocky intertidal macroalgal turfs. A total of 55 specimens were collected, initially fixed in formol and later transferred to ethanol for permanent preservation. Morphological identification was performed in the laboratory and compared with specimens from other latitudes. Additionally, 56 historical occurrence records were compiled from published literature covering Chile, the Falkland Islands (Malvinas), and Tristan da Cunha (1902–2019). This design allowed us to confirm the first record of P. falklandica from Peru and to extend its known northern range to approximately 15°50'S.","relatedProjects":[],"abstract":"We document the first record of the polychaete Perinereis falklandica (Ramsay, 1914) from Peruvian waters, extending its known northern distribution limit from 18°28'S in Chile to approximately 15°50'S in southern Peru. A total of 55 specimens were collected between 2021, 2024 and 2025 from rocky intertidal macroalgal turfs at several localities in southern Peru. Morphological identification was performed, and differences in key traits compared to specimens from other latitudes are discussed. This finding suggests a continuous Chilean-Peruvian population within the marine Humboldtian ecoregion and represents the northernmost range extension for this species in the Southeastern Pacific."},"samplingDescription":{"studyExtent":"The study extent covers the intertidal zone along the southern coast of Peru, specifically the Department of Arequipa, from approximately 15°50'S (Atiquipa, Puerto Inka) to 17°15'S (Punta de Bombón). Field sampling was conducted at 13 localities within this area. Sampling events occurred during three temporal periods: 2021 (August), 2024 (May and December), and 2025 (January to February), primarily during late spring and summer when calm wave conditions allowed access to the shore. The overall geographic study extent is representative of the southern Peruvian intertidal zone within the marine Humboldtian ecoregion.","sampling":"Sampling was carried out at 13 rocky intertidal sites along the coast of Arequipa, southern Peru, during late spring and summer of 2021, 2024, and 2025 during calm sea conditions that allow safer and easier access to the shore. At each site, sampling focused on areas with algal turfs, where nereidid polychaetes are commonly found. The turfs were scraped into containers and left undisturbed until specimens began to emerge. Once emerged, specimens were transferred into small containers with seawater and narcotized using a 7.5% magnesium chloride solution to promote pharynx eversion, although not all specimens everted the pharynx. This narcotization step ensured proper relaxation of the specimens for morphological examination. After relaxation, specimens were initially fixed in a 4% formaldehyde seawater solution and later transferred to 80% ethanol for long-term preservation. All collected specimens were deposited in the invertebrate collection of the Museo Sur Peruano (MSP), administered by the Instituto Científico Michael Owen Dillon (IMOD) in Peru.","methodSteps":["Step 1. Field collection. Specimens were collected from 13 rocky intertidal sites in Arequipa, southern Peru, during late spring and summer of 2021, 2024 and 2025. Macroalgal turfs were scraped during low tide, and specimens were transferred into containers with seawater.\nStep 2. Narcotization. Specimens were narcotized using a 7.5% magnesium chloride solution until pharynx eversion was observed, ensuring proper relaxation. Not all the specimens everted the proboscis. \n\nStep 3. Fixation and preservation. Specimens were fixed in 4% formaldehyde seawater solution, then transferred to 80% ethanol for long-term preservation.\n\nStep 4. Laboratory identification. Specimens were examined under a stereomicroscope. The pharynx was dissected ventrally when not everted. Temporary chaetae slides were prepared. Identification followed taxonomic keys and published descriptions (Ramsay 1914; Rozbaczylo and Castilla 1973; Sampértegui et al. 2013; Darbyshire 2014; Wilson et al. 2023).\n\nStep 5. Morphometrics. Total length, body width, number of chaetigers, and paragnath counts (Areas I-VIII) were recorded for each specimen.\n\nStep 6. Voucher deposition. All specimens were deposited in the Museo Sur Peruano (MSP), Arequipa, under catalog numbers MSP-INV 011 to MSP-INV 024.\n\nStep 7. Literature compilation. Published occurrence records were compiled from peer-reviewed articles. Geographic coordinates were extracted or estimated from locality descriptions.\n\nStep 8. Quality control. Morphological identifications were validated by expert co-authors. Geographic coordinates were verified against locality descriptions."]},"countryCoverage":[],"collections":[{"name":"Museo Sur Peruano","identifier":"MSP","parentIdentifier":"Not applicable","specimenPreservationMethod":"ALCOHOL","curatorialUnits":[]}],"dataDescriptions":[],"dataLanguage":"eng","purpose":"This dataset aims to document and extend the known distribution of the polychaete Perinereis falklandica (Ramsay, 1914) in South America. Prior to this study, the northernmost limit of this species was recorded in northern Chile (18°28'S). Through recent field collections along the southern Peruvian coast between 2021, 2024 and 2025, we obtained 55 specimens from rocky intertidal macroalgal turfs, representing the first confirmed record of P. falklandica from Peruvian waters. Combined with 56 compiled bibliographic records from Chile, the Falkland Islands (Malvinas), and Tristan da Cunha, the dataset contains 70 occurrence records in total. The new findings extend the species' northern range to approximately 15°S (Puerti Inka, Peru), suggesting a continuous distribution along the Humboldtian ecoregion. This dataset provides primary occurrence data useful for biogeographic and ecological studies of benthic invertebrates in the Southeastern Pacific.
","introduction":"The polychaete worm Perinereis falklandica (Ramsay, 1914) belongs to the family Nereididae. This species has been previously recorded from the Southwestern Atlantic, including the Falkland Islands (Malvinas) and Tristan da Cunha, as well as along the Southeastern Pacific coast of Chile. Until now, its northernmost known distribution limit was reported from northern Chile at approximately 18°28'S. The absence of formal records from Peru left a significant gap in our understanding of its continuous distribution along the Humboldtian ecoregion, a highly productive coastal upwelling system.
The primary objective of this dataset is to document the first confirmed occurrence of Perinereis falklandica from Peruvian waters, thereby extending its known northern range limit to approximately 15°S (Atiquipa, Peru). Between 2021, 2024 and 2025, we conducted field collections along the southern Peruvian coast, targeting rocky intertidal habitats dominated by macroalgal turfs. A total of 55 specimens were collected and identified based on morphological features. Additionally, we compiled 56 bibliographic records from published literature, with collection dates ranging from 1902 to 2019, from Chile, the Falkland Islands (Malvinas), and Tristan da Cunha.
This dataset integrates primary field data with historical occurrence records to provide a more complete picture of the species' biogeography. These data have been used to confirm a continuous Chilean-Peruvian population within the marine Humboldtian ecoregion. In the future, this dataset may serve as a baseline for studies on range shifts related to oceanographic changes, larval dispersal, and intertidal community ecology in the Southeastern Pacific. Differences in key morphological traits compared to specimens from other latitudes are also discussed in the main manuscript, opening new questions about intraspecific variation across the species' distribution.
","gettingStarted":"This dataset consists of one data file containing a single table with 70 occurrence records of Perinereis falklandica (Ramsay, 1914) from South America. Of these, 14 records correspond to newly collected material from the Peruvian coast, and 56 records were compiled from published literature, with collection dates ranging from 1902 to 2019, covering Chile, the Falkland Islands (Malvinas), and Tristan da Cunha (Atlantic Ocean).
The file includes the following fields for each record:
The sampling design targeted rocky intertidal zones dominated by macroalgal turfs along the southern Peruvian coast. New specimens were collected manually during low tides, initially fixed in formol (formaldehyde) and later transferred to ethanol for permanent preservation. Identification was carried out in the laboratory using morphological features. Compiled records were extracted from peer‑reviewed articles and taxonomic monographs; geographic coordinates were verified or estimated when necessary. Users can distinguish between field‑collected and literature‑based records by checking the catalogNumber (present for new specimens) and bibliographicSource (present for compiled records) fields.
","pubDate":"2026-04-27T00:00:00.000+00:00","maintenanceUpdateFrequency":"AS_NEEDED","maintenanceDescription":"The dataset will be updated as needed when new occurrence records of Perinereis falklandica become available or when errors or omissions are identified in the current data.","license":"http://creativecommons.org/licenses/by/4.0/legalcode","approximateCounts":{"occurrenceCount":0}}