Evidence map›Paper›PMID 33203333›Full record

ArticleProceedings. Biological sciences2020

What would it take to describe the global diversity of parasites?

Colin J Carlson, Tad A Dallas, Laura W Alexander, Alexandra L Phelan, Anna J Phillips

Abstract read
In one paragraph

Article in Proceedings. Biological sciences, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 55 papers.

0numbers the graph read from it
0cells of the map it votes in
55citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

55 citing papers in PubMed.

  1. Article
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  3. Long-term trends in parasite diversity and infection levels: approaches and patterns.Biological reviews of the Cambridge Philosophical Society · 2026
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  16. Pathogens and planetary change.Nature reviews. Biodiversity · 2025
    Article
  17. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Colin J CarlsonDepartment of Microbiology and Immunology, Georgetown University Medical Center, Washington, DC 20057, USA.
Tad A DallasCentre for Ecological Change, University of Helsinki, 00840 Helsinki, Finland.
Laura W AlexanderDepartment of Integrative Biology, University of California, Berkeley, CA, USA.
Alexandra L PhelanCenter for Global Health Science and Security, Georgetown University, Washington, DC, USA.
Anna J PhillipsDepartment of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

How many parasites are there on Earth? Here, we use helminth parasites to highlight how little is known about parasite diversity, and how insufficient our current approach will be to describe the full scope of life on Earth. Using the largest database of host-parasite associations and one of the world's largest parasite collections, we estimate a global total of roughly 100 000-350 000 species of helminth endoparasites of vertebrates, of which 85-95% are unknown to science. The parasites of amphibians and reptiles remain the most poorly described, but the majority of undescribed species are probably parasites of birds and bony fish. Missing species are disproportionately likely to be smaller parasites of smaller hosts in undersampled countries. At current rates, it would take centuries to comprehensively sample, collect and name vertebrate helminths. While some have suggested that macroecology can work around existing data limitations, we argue that patterns described from a small, biased sample of diversity aren't necessarily reliable, especially as host-parasite networks are increasingly altered by global change. In the spirit of moonshots like the Human Genome Project and the Global Virome Project, we consider the idea of a Global Parasite Project: a global effort to transform parasitology and inventory parasite diversity at an unprecedented pace.

Indexed as

BiodiversityHelminthsHost-Parasite InteractionsParasitesAnimalsFishesHumansVertebratesbiodiversity estimationmuseum collectionsparasitessystematicstapeworms

Identifiers

PMID33203333
PMCPMC7739500

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.