Mediolabrus
{{Short description|Genus of single-celled algae}}
{{Automatic taxobox
| taxon = Mediolabrus
| authority = Yang Li
| type_species = Mediolabrus comicus
| type_species_authority = (H.Takano) Yang Li
| subdivision_ranks = Species
| subdivision =
}}
Mediolabrus is a genus of centric diatoms within the family Thalassiosiraceae. Known Mediolabrus species live planktonically in brackish and fresh water.{{Cite journal |last1=Li |first1=Yang |last2=Guo |first2=Xiao-Hui |last3=Lundholm |first3=Nina |date=2020 |editor-last=Wetherbee |editor-first=R. |title=Molecular Phylogeny and Taxonomy of the Genus Minidiscus (Bacillariophyceae), with Description of Mediolabrus gen. nov |url=https://onlinelibrary.wiley.com/doi/10.1111/jpy.13038 |journal=Journal of Phycology |language=en |volume=56 |issue=6 |pages=1443–1456 |doi=10.1111/jpy.13038 |pmid=32510583 |bibcode=2020JPcgy..56.1443L |issn=0022-3646|url-access=subscription }} This genus, together with the related Minidiscus, includes some of the smallest diatom species with diameters as small as 1.9 μm (in M. comicus).{{Cite journal |last1=Jewson |first1=David |last2=Kuwata |first2=Akira |last3=Cros |first3=Lluïsa |last4=Fortuño |first4=José Manuel |last5=Estrada |first5=Marta |date=2016-09-30 |title=Morphological adaptations to small size in the marine diatom Minidiscus comicus |url=https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1660 |journal=Scientia Marina |volume=80 |issue=S1 |pages=89–96 |doi=10.3989/scimar.04331.06C |bibcode=2016ScMar..80S..89J |issn=1886-8134|hdl=10261/138162 |hdl-access=free }}
Taxonomy
Genus Mediolabrus was erected in 2020 based on molecular phylogenetics, by transferring three species from the genus Minidiscus.
Morphology and ultrastructure
The lenticular or spherical cells, smaller than 10 μm, live solitarily or in flocks. The valves (ends of the siliceous shell{{Cite web |title=Valve {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/valve |access-date=2025-04-26 |website=diatoms.org |language=en-US}}) are domed, with sloping mantle (side of the valve{{Cite web |title=Mantle {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/mantle |access-date=2025-04-26 |website=diatoms.org |language=en-US}}). The areolae (regularly repeated pores{{Cite web |title=Areola {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/areola |access-date=2025-04-26 |website=diatoms.org |language=en-US}}) are internally covered by individual, radially continuous cribra (perforated plates{{Cite web |title=Cribrum {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/cribrum |access-date=2025-04-26 |website=diatoms.org |language=en-US}}) and lack typical foramens (large openings{{Cite web |title=Foramen {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/foramina |access-date=2025-04-26 |website=diatoms.org |language=en-US}}) externally. At the edge of the valve face or close to the mantle are several fultoportulae (tube-like pores{{Cite web |title=Fultoportula {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/fultoportula |access-date=2025-04-26 |website=diatoms.org |language=en-US}}). There is only one rimoportula (lip-like pore{{Cite web |title=Rimoportula {{!}} Glossary - Diatoms of North America |url=https://diatoms.org/glossary/rimoportula |access-date=2025-04-26 |website=diatoms.org |language=en-US}}) and no fultoportulae in the center or sub-center of the valve. Only a single rimoportula near the valve center is a diagnostic feature of this genus and the source of its name.
See also
References
{{Reflist}}
External links
- [https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=2802208 Mediolabrus in NCBI Taxonomy]
- {{AlgaeBase genus|name=Mediolabrus|id=53007}}
{{Taxonbar|from=Q134127237}}