The biology and life cycle of enigmatic crustacean y-larvae: a review

N Dreyer, J Olesen, MJ Grygier… - … and Marine Biology, 2023‏ - taylorfrancis.com
Resolution of recalcitrant nodes in the Tree of Life has been substantially eased recently by
increased worldwide sampling and advancements in sequencing technology. It has become …

Taxonomic diversity of marine planktonic 'y-larvae'(Crustacea: Facetotecta) from a coral reef hotspot locality (Japan, Okinawa), with a key to y-nauplii

J Olesen, MJ Grygier - European journal of …, 2024‏ - europeanjournaloftaxonomy.eu
Abstract The enigmatic 'y-larvae'(Thecostraca: Facetotecta) are microscopic marine
planktonic crustaceans that were discovered more than a century ago, yet to this day their …

Single-specimen systematics resolves the phylogeny and diversity conundrum of enigmatic crustacean y-larvae

N Dreyer, F Palero, MJ Grygier, BKK Chan… - Molecular Phylogenetics …, 2023‏ - Elsevier
Resolving the evolutionary history of organisms is a major goal in biology. Yet for some taxa
the diversity, phylogeny, and even adult stages remain unknown. The enigmatic crustacean …

Integrative taxonomy of crustacean y-larvae (Thecostraca: Facetotecta) using laboratory-rearing and molecular analyses of single specimens, with the description of a …

J Olesen, N Dreyer, F Palero… - Zoological Journal of …, 2022‏ - academic.oup.com
Facetotecta, the taxon established for 'y-larvae', is the last major crustacean group for which
the adult stage remains unknown. With only 14 described nominal species, all in the genus …

A synthesis of the external morphology of cypridiform larvae of Facetotecta (crustacea: Thecostraca) and the limits of the genus Hansenocaris

GA Kolbasov, AS Savchenko, N Dreyer… - Ecology and …, 2022‏ - Wiley Online Library
Although the naupliar and cypridiform stages of the enigmatic y‐larvae of Facetotecta have
been found in the marine plankton worldwide, they still represent the last significant group of …

Two new species of lecithotrophic nauplius y with remarkable labra from Okinawa, Japan, and a family-group name for y-larvae (Crustacea: Thecostraca: Facetotecta …

J Olesen, MJ Grygier - Species Diversity, 2022‏ - jstage.jst.go.jp
Two large (ca. 0.5 mm long), rare, and probably closely related species of Facetotecta (y-
larvae), Hansenocaris cristalabri sp. nov. and Hansenocaris aquila sp. nov., are described …

Autofluorescence imaging of exuviae as a tool for studying slide preparations of micro-arthropods, exemplified by a museum collection of the enigmatic crustacean “y …

J Olesen, MJ Grygier, M Herranz - Zoomorphology, 2024‏ - Springer
In recent years, fluorescence microscopy has revitalized the study of invertebrate
comparative morphology. Here we explore the usefulness of combining confocal laser …

Abundance survey of crustacean “y-larvae”(Thecostraca: Facetotecta) over a fringing reef in Okinawa, Japan, with special reference to the two dominant planktotrophic …

J Olesen, MJ Grygier, F Palero, N Dreyer… - Marine Biodiversity, 2025‏ - Springer
Abstract Facetotecta, or “y-larvae”, are mysterious planktonic crustaceans that are known
only from their larval instars, but which are often assumed to be endoparasitic as adults …

[PDF][PDF] A new species of the Y-larva genus Hansenocaris Itô, 1985 (Crustacea: Thecostraca: Facetotecta) from the Azores, with notes on its morphology and …

GA Kolbasov, AS Savchenko… - Arthropoda Selecta …, 2021‏ - kmkjournals.com
A new facetotectan species, described herein as Hansenocaris spiridonovi Kolbasov,
Savchenko et Høeg sp. n. and based on its cypridiform stage, was found in the plankton off …

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

N Dreyer, F Palero, M Grygier, A Savchenko… - Authorea …, 2022‏ - authorea.com
The enigmatic “y-larvae”(Pancrustacea: Facetotecta) still have an incompletely understood
lifecycle, and their adult forms remain unknown despite their discovery more than 100 years …