Genetic analysis of the Linnaean Ulva lactuca (Ulvales, Chlorophyta) holotype and related type specimens reveals name misapplications, unexpected origins, and new synonymies

Current usage of the name Ulva lactuca, the generitype of Ulva, remains uncertain. Genetic analyses were performed on the U. lactuca Linnaean holotype, the U. fasciata epitype, the U. fenestrata holotype, the U. lobata lectotype, and the U. stipitata lectotype. The U. lactuca holotype is nearly iden...

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Bibliographic Details
Published in:Journal of phycology 2019-06, Vol.55 (3), p.503-508
Main Authors: Hughey, Jeffery R., Maggs, Christine A., Mineur, Frédéric, Jarvis, Charlie, Miller, Kathy Ann, Shabaka, Soha Hamdy, Gabrielson, Paul W.
Format: Article
Language:English
Subjects:
Aquatic life
Chlorophyta
Deoxyribonucleic acid
DNA
DNA sequences
DNA sequencing
Europe
Genetic analysis
Lectotype
Lectotypes
Northern Hemisphere
Nucleotide sequence
Platinum
Sequence Analysis, DNA
Species
Synonymy
Tropical climate
Type specimens
Ulva
Ulva fenestrata
Ulva lactuca
Uncertainty analysis
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Summary:Current usage of the name Ulva lactuca, the generitype of Ulva, remains uncertain. Genetic analyses were performed on the U. lactuca Linnaean holotype, the U. fasciata epitype, the U. fenestrata holotype, the U. lobata lectotype, and the U. stipitata lectotype. The U. lactuca holotype is nearly identical in rbcL sequence to the epitype of U. fasciata, a warm temperate to tropical species, rather than the cold temperate species to which the name U. lactuca has generally been applied. We hypothesize that the holotype specimen of U. lactuca came from the Indo‐Pacific rather than northern Europe. Our analyses indicate that U. fasciata and U. lobata are heterotypic synonyms of U. lactuca. Ulva fenestrata is the earliest name for northern hemisphere, cold temperate Atlantic and Pacific species, with U. stipitata a junior synonym. DNA sequencing of type specimens provides an unequivocal method for applying names to Ulva species.
ISSN:0022-3646
1529-8817
DOI:10.1111/jpy.12860