Lagosinema tenuis gen. et sp. nov. (Prochlorotrichaceae, Cyanobacteria): a new brackish water genus from Tropical Africa

Abstract

A novel filamentous, nonheterocytous cyanobacterium was isolated from Lagos Lagoon, Nigeria. The isolate was <3.0 µm wide, untapered, with small rounded polar bodies (aerotopes or cyanophycin granules) visible at the crosswalls, and consequently fit the morphological description of Limnothrix planctonica. Although morphologically inseparable from that species, it was molecularly distant from that taxon, with genetic identities between the two taxa ranging 90.73-92.49%, a degree of separation typical of different genera. Both taxa, as well as Limnothrix rosea, are phylogenetically in the Prochlorotrichaceae, distant from the type species of Limnothrix, L. redekei, which is in the Pseudanabaenaceae. The isolate is herein described as Lagosinema tenuis gen. et sp. nov.

When Is A Lineage A Species? A Case Study In Myxacorys gen. nov. (Synechococcales: Cyanobacteria) With The Description of Two New Species From The Americas

“…An example of this confusion can be found in the genus Leptolyngbya. Although progress has been made to resolve the polyphyly of Leptolyngbya (Perkerson et al 2011, Osorio-Santos et al 2014, Mai et al 2018, sequences assigned to several Leptolyngbya morphospecies still place outside Leptolyngbya sensu stricto (Osorio-Santos et al 2014, Becerra-Absalon et al 2018, Heidari et al 2018, Mai et al 2018, Akagha et al 2019.…”

Dynamics of nutrient and phytoplankton in Epe Lagoon, Nigeria: possible causes and consequences of reoccurring cyanobacterial blooms

“…These bloom series were reported to cause colouration, anoxia, odour and bad taste of the water in these aquatic ecosystems. Akagha et al 2019 documented the presence of a new cyanobacterial species Lagosinema tenuis in the Lagos lagoon which further highlights the ecological relevance of cyanobacterial dominance in tropical African lagoon systems. In this paper, our objectives are to elucidate: (1) environmental variables and phytoplankton dynamics, (2) nutrient dynamics and eutrophication and (3) annual cyanobacterial blooms and associated environmental factors in Epe lagoon through an 18-month investigation of three ecological sites.…”

Thainema gen. nov. (Leptolyngbyaceae, Synechococcales): A new genus of simple trichal cyanobacteria isolated from a solar saltern environment in Thailand

“…In the present study, data available on the origins of the studied strains show an interesting pattern in their geographical distribution. Despite substantial molecular analyses conducted to expand our knowledge of cyanobacterial diversity worldwide in saline, non-planktic habitats, including marine coasts (e.g., [74,75]), mangroves (e.g., [69]), and brackish waters (e.g., [76]), and the high number of publicly available sequences, the distribution of Thainema gen. nov. seems limited to the Northern Hemisphere, notably East Asia (Thailand, this study, red circle on the map; China, accession number: MH683727), the Pacific Region (Hawaii, accession number: KM462585), and North America (strains UMPCCC 1239 and UTEX SP44 [red circle on the map], accession numbers: KM218876 and HQ658458, respectively). shows that the Baas Becking (1934) hypothesis, i.e., "everything is everywhere, but the environment selects", cannot generally be applied to all microorganisms.…”