Seven ascidian (Tunicata) species from the North Eastern Mediterranean
Published:
Oct 4, 2023
Keywords:
Botryllid ascidians Didemnum Polyclinum Symplegma COI species delimitation
Abstract
Members of the tunicates, a subphylum of marine filter-feeder chordates, inhabit all marine and oceanic habitats from the subtidal to the abyssal. Considered the closest relatives to the vertebrates, the tunicates are widely used as model organisms for evo-devo, allorecognition, senescence, and whole-body regeneration studies. However, species boundaries are poorly understood due to the high morphological and genetic plasticity that characterizes many tunicate taxa. Here, we present findings on seven tunicate species (Botrylloides israeliense, Botrylloides sp., Botryllus humilis, Botryllus schlosseri, Symplegma brakenhielmi, Polyclinum constellatum and Didemnum perlucidum) sampled from six Turkish sites at the North Eastern Mediterranean Sea and employed the mitochondrial barcoding marker (COI) for evaluating the relationships among geographically restricted and widely spread ascidian species. Species delimitation was conducted using sequences generated in the current study in addition to sequences obtained from GenBank. General morphological features and colors of colonies were recorded at sampling sites. Then, all Styelidae colonies were attached and cultured on slides in an aquaculture room, enabling the study of other features, such as zooid distributions and sizes, oral tentacle numbers, and life cycles, using stereo and light microscopes. The spicules of formalin-fixed Didemnum perlucidum samples were examined under a light microscope. Then, scientific names were assigned to all species based on the results of the species delimitation and on comparisons of the obtained COI sequences with GenBank sequences. A putative new Botrylloides species (Botrylloides sp.) from the Antalya region was revealed, with a 99% match with the COI gene of another specimen from Saudi Arabia; further waiting for detailed traditional taxonomy.
Article Details
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KARAHAN, A., TEMIZ, B., ÖZTÜRK, E., DOUEK, J., & RINKEVICH, B. (2023). Seven ascidian (Tunicata) species from the North Eastern Mediterranean. Mediterranean Marine Science, 24(3), 545–557. https://doi.org/10.12681/mms.32937
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