Single-specimen systematics resolves the phylogeny and diversity conundrum of enigmatic crustacean y-larvae
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Single-specimen systematics resolves the phylogeny and diversity conundrum of enigmatic crustacean y-larvae. / Dreyer, Niklas; Palero, Ferran; Grygier, Mark J.; Chan, Benny K. K.; Olesen, Jørgen.
In: Molecular Phylogenetics and Evolution, Vol. 184, 107780, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Single-specimen systematics resolves the phylogeny and diversity conundrum of enigmatic crustacean y-larvae
AU - Dreyer, Niklas
AU - Palero, Ferran
AU - Grygier, Mark J.
AU - Chan, Benny K. K.
AU - Olesen, Jørgen
N1 - Publisher Copyright: © 2023
PY - 2023
Y1 - 2023
N2 - 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 “y-larvae” (Facetotecta) are one particularly striking example. Here, we use extensive video-imaging and single-specimen molecular sequencing of >200 y-larval specimens to comprehensively explore for the first time their evolutionary history and diversity. This integrative approach revealed five major clades of Facetotecta, four of which encompass a considerable larval diversity. Whereas morphological analyses recognized 35 y-naupliar “morphospecies”, molecular species-delimitation analyses suggested the existence of between 88 and 127 species. The phenotypic and genetic diversity between the morphospecies suggests that a more elaborate classification than the current one-genus approach is needed. Morphology and molecular data were highly congruent at shallower phylogenetic levels, but no morphological synapomorphies could be unambiguously identified for major clades, which mostly comprise both planktotrophic and lecithotrophic y-nauplii. We argue that lecithotrophy arose several times independently whereas planktotrophic y-nauplii, which are structurally more similar across clades, most likely display the ancestral feeding mode of Facetotecta. We document a remarkably complex and highly diverse phylogenetic backbone for a taxon of larval marine crustaceans, the full life cycle of which remains a mystery.
AB - 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 “y-larvae” (Facetotecta) are one particularly striking example. Here, we use extensive video-imaging and single-specimen molecular sequencing of >200 y-larval specimens to comprehensively explore for the first time their evolutionary history and diversity. This integrative approach revealed five major clades of Facetotecta, four of which encompass a considerable larval diversity. Whereas morphological analyses recognized 35 y-naupliar “morphospecies”, molecular species-delimitation analyses suggested the existence of between 88 and 127 species. The phenotypic and genetic diversity between the morphospecies suggests that a more elaborate classification than the current one-genus approach is needed. Morphology and molecular data were highly congruent at shallower phylogenetic levels, but no morphological synapomorphies could be unambiguously identified for major clades, which mostly comprise both planktotrophic and lecithotrophic y-nauplii. We argue that lecithotrophy arose several times independently whereas planktotrophic y-nauplii, which are structurally more similar across clades, most likely display the ancestral feeding mode of Facetotecta. We document a remarkably complex and highly diverse phylogenetic backbone for a taxon of larval marine crustaceans, the full life cycle of which remains a mystery.
KW - Facetotecta
KW - Larval evolution
KW - Larval systematics
KW - Phylogeny estimation
U2 - 10.1016/j.ympev.2023.107780
DO - 10.1016/j.ympev.2023.107780
M3 - Journal article
C2 - 37031710
AN - SCOPUS:85158887755
VL - 184
JO - Molecular Phylogenetics and Evolution
JF - Molecular Phylogenetics and Evolution
SN - 1055-7903
M1 - 107780
ER -
ID: 347294416