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The Current State of Eunicida (Annelida) Systematics and Biodiversity

Interstitial Annelida

Marine Biological Section, Department of Biology, University of Copenhagen, Universitetsparken 4, 2100 Copenhagen, Denmark
Center of Natural History–Zoological Museum, Universität Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany
Center for Marine Studies, Federal University of Paraná, Av. Beira Mar s/n, 83255-976, Pontal do Sul, Pontal do Paraná, Paraná 83255-976, Brazil
Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, P.O. Box 37021, Washington, DC 20013-7012, USA
Institut de Systématique, Evolution, Biodiversité, ISYEB–UMR 7205 MNHN CNRS UPMC EPHE, Sorbonne Universités, 45 rue Buffon, 75005 Paris, France
Molecular Ecology Group (MEG), Water Research Institute (IRSA), National Research Council of Italy (CNR), 28922 Verbania, Italy
Author to whom correspondence should be addressed.
Academic Editors: Michael Wink, Maria Capa and Pat Hutchings
Diversity 2021, 13(2), 77;
Received: 22 December 2020 / Revised: 29 January 2021 / Accepted: 2 February 2021 / Published: 12 February 2021
(This article belongs to the Special Issue Systematics and Diversity of Annelids)
Members of the following marine annelid families are found almost exclusively in the interstitial environment and are highly adapted to move between sand grains, relying mostly on ciliary locomotion: Apharyngtidae n. fam., Dinophilidae, Diurodrilidae, Nerillidae, Lobatocerebridae, Parergodrilidae, Polygordiidae, Protodrilidae, Protodriloididae, Psammodrilidae and Saccocirridae. This article provides a review of the evolution, systematics, and diversity of these families, with the exception of Parergodrilidae, which was detailed in the review of Orbiniida by Meca, Zhadan, and Struck within this Special Issue. While several of the discussed families have previously only been known by a few described species, recent surveys inclusive of molecular approaches have increased the number of species, showing that all of the aforementioned families exhibit a high degree of cryptic diversity shadowed by a limited number of recognizable morphological traits. This is a challenge for studies of the evolution, taxonomy, and diversity of interstitial families as well as for their identification and incorporation into ecological surveys. By compiling a comprehensive and updated review on these interstitial families, we hope to promote new studies on their intriguing evolutionary histories, adapted life forms and high and hidden diversity. View Full-Text
Keywords: systematics; identification; meiobenthos; annelids systematics; identification; meiobenthos; annelids
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MDPI and ACS Style

Worsaae, K.; Kerbl, A.; Domenico, M.D.; Gonzalez, B.C.; Bekkouche, N.; Martínez, A. Interstitial Annelida. Diversity 2021, 13, 77.

AMA Style

Worsaae K, Kerbl A, Domenico MD, Gonzalez BC, Bekkouche N, Martínez A. Interstitial Annelida. Diversity. 2021; 13(2):77.

Chicago/Turabian Style

Worsaae, Katrine, Alexandra Kerbl, Maikon Di Domenico, Brett C. Gonzalez, Nicolas Bekkouche, and Alejandro Martínez. 2021. "Interstitial Annelida" Diversity 13, no. 2: 77.

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