Chaetoceros mannaii, Li & Boonprakob & Gaonkar & Kooistra & Lange & Hernández-Becerril & Chen & Moestrup & Lundholm, 2017

Li, Yang, Boonprakob, Atchaneey, Gaonkar, Chetan C., Kooistra, Wiebe H. C. F., Lange, Carina B., Hernández-Becerril, David, Chen, Zuoyi, Moestrup, Øjvind & Lundholm, Nina, 2017, Diversity in the Globally Distributed Diatom Genus Chaetoceros (Bacillariophyceae): Three New Species from Warm-Temperate Waters, PLoS ONE (e 0168887) 12 (1), pp. 1-38 : 33-34

publication ID

https://doi.org/ 10.1371/journal.pone.0168887

DOI

https://doi.org/10.5281/zenodo.12630682

persistent identifier

https://treatment.plazi.org/id/E87C87F4-8344-FFFA-FDE6-7ACDAF56FCD1

treatment provided by

Felipe

scientific name

Chaetoceros mannaii
status

 

Chaetoceros mannaii

Cells of C. mannaii are ultrastructurally similar to field material identified as C. lorenzianus from Thailand, Mexico and Japan ([ 12, 36], own observations). Compared to the original description of C. lorenzianus , C. mannaii has large poroids on the setae, 0.7±0.2 μm long, the largest among strains of section Dicladia examined by us, and readily visible in LM. They are more closely spaced (12.3±1.6) than in the type material of C. lorenzianus (7.2±1.7), and smaller than those of the Mexican ([ 12], pl. 23, figs 3 and 4) and Japanese material ([ 36], pl. VI, fig 7) tentatively identified as C. lorenzianus , where poroids of 1 μm or more were illustrated. In addition, the apertures of C. mannaii are hexagonal, compared to the more quadrangular apertures of C. lorenzianus (compare Figs 11C, 11d View Fig 11 , 16A and 16B View Fig 16 ) [ 8]. Chaetoceros mannaii also differs in having a smaller apical axis, 5.7–12.9 μm, compared to 20–43 μm in C. lorenzianus [ 8], 13–25 μm in the Mexican material [ 12] and around 30 μm (with a variation of 10–

80 μm) in the Japanese material [ 36].

Cells of C. mannaii are otherwise characterized by heavily silicified frustules and a distinct furrow above the basal ring of the mantle ( Fig 11F View Fig 11 , arrowheads). The terminal cell of C. mannaii carries a relatively long and distinct external tube of the rimoportula ( Figs 11E, 11F View Fig 11 and 12C View Fig 12 ). An external tube was not observed in C. decipiens , C. laevisporus and C. mitra ( Figs 2F View Fig 2 , 8E View Fig 8 and 14G View Fig 14 ), and a very short one was present in C. elegans ( Fig 5D and 5E View Fig 5 ). This character still needs to be explored in C. lorenzianus .

Resting spores were not observed in C. mannaii although several attempts were made to induce spore formation.

VI

Mykotektet, National Veterinary Institute

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