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Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Novel molecular resources for single-specimen barcoding of enigmatic crustacean y-larvae

Niklas Dreyer https://orcid.org/0000-0002-1391-1642 A B C D J , Jørgen Olesen https://orcid.org/0000-0001-9582-7083 A * , Mark J. Grygier E , Danny Eibye-Jacobsen https://orcid.org/0000-0002-7079-2627 A , Alexandra S. Savchenko https://orcid.org/0000-0001-6167-5405 F , Yoshihisa Fujita https://orcid.org/0000-0003-1906-746X G , Gregory A. Kolbasov https://orcid.org/0000-0002-3762-1834 H , Ryuji J. Machida https://orcid.org/0000-0003-1687-4709 B , Benny K. K. Chan https://orcid.org/0000-0001-9479-024X B * and Ferran Palero https://orcid.org/0000-0002-0343-8329 I *
+ Author Affiliations
- Author Affiliations

A Natural History Museum of Denmark, University of Copenhagen, Denmark.

B Biodiversity Research Center, Academia Sinica, Taipei, Taiwan.

C Department of Life Science, National Taiwan Normal University, Taipei, Taiwan.

D Biodiversity Program, Taiwan International Graduate Program, Academia Sinica, Taipei, Taiwan.

E National Museum of Marine Biology & Aquarium, Checheng, Pingtung, Taiwan.

F Invertebrate Zoology Department, Biological Faculty, Moscow State University, Moscow, Russian Federation.

G General Education Center, Okinawa Prefectural University of Arts, Naha, Okinawa, Japan.

H White Sea Biological Station, Biological Faculty of Moscow State University, Moscow, Russian Federation.

I Institut Cavanilles de Biodiversitat i Biologia Evolutiva (ICBIBE), University of Valencia, Paterna, Spain.

J Present address: Department of Organismic and Evolutionary Biology, Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA.

* Correspondence to: jolesen@snm.ku.dk

Handling Editor: Shane Ahyong

Invertebrate Systematics 38, IS23018 https://doi.org/10.1071/IS23018
Submitted: 25 April 2023  Accepted: 8 January 2024  Published: 8 March 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Despite discovery more than 100 years ago and documented global occurrence from shallow waters to the deep sea, the life cycle of the enigmatic crustacean y-larvae isincompletely understood and adult forms remain unknown. To date, only 2 of the 17 formally described species, all based on larval stages, have been investigated using an integrative taxonomic approach. This approach provided descriptions of the morphology of the naupliar and cyprid stages, and made use of exuvial voucher material and DNA barcodes. To improve our knowledge about the evolutionary history and ecological importance of y-larvae, we developed a novel protocol that maximises the amount of morpho-ecological and molecular data that can be harvested from single larval specimens. This includes single-specimen DNA barcoding and daily imaging of y-nauplii reared in culture dishes, mounting of the last naupliar exuviae on a slide as a reference voucher, live imaging of the y-cyprid instar that follows, and fixation, DNA extraction, amplification and sequencing of the y-cyprid specimen. Through development and testing of a suite of new primers for both nuclear and mitochondrial protein-coding and ribosomal genes, we showcase how new sequence data can be used to estimate the phylogeny of Facetotecta. We expect that our novel procedure will help to unravel the complex systematics of y-larvae and show how these fascinating larval forms have evolved. Moreover, we posit that our protocols should work on larval specimens from a diverse array of moulting marine invertebrate taxa.

Keywords: barcoding, biodiversity, Facetotecta, larval barcoding, molecular resources, new primers, systematics, y-larvae.

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