Exploring Diversity, Taxonomy and Phylogeny of Diatoms (Bacillariophyta) from Marine Habitats. Novel Taxa with Internal Costae

Witkowski, Andrzej; Ashworth, Matt P.; Li, Chunlian; Sagna, Ibrahima; Yatte, D.; Górecka, Ewa; Franco, Andréa O.R.; Kusber, Wolf‐Henning; Klein, Georgia; Lange‐Bertalot, Horst; Dąbek, Przemysław; Theriot, Edward C.; Manning, Schonna R.

doi:10.1016/j.protis.2020.125713

Cited by 13 publications

(16 citation statements)

References 31 publications

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“…Moreover, the presence of fan-shaped spines arranged along the valve margin and growing independently is another important feature for A. dajingensis (Fig. 3A-D), comparing with small and globular spines present along the valve margin, sometimes growing together into a ridge-like structure in A. balticus (Witkowski et al 2020). Sternum in A. dajingensis is distinct and somewhat far from the apices (Fig.…”

Section: Discussionmentioning

confidence: 98%

“…Moreover, in A. dajingensis, the spines are fan-shaped along the valve margin, not growing together into a continuous ridge (Fig. 3A-D), while in A. tenuissimus, the spines are small and globular along the valve margin, sometimes growing together into a continuous ridge (Witkowski et al 2020). A. dajingensis is different from A. tenuissimus in areolae density (50-60 in 10 μm vs. 70-80 in 10 μm) (Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…The genus Ambo Witkowski, Ashworth, Lange-Bertalot & G. Klein is a recently established genus, with three species transferred and one species newly described by Witkowski et al (2020). Witkowski et al (2020) made new combinations for Anaulus balticus, Anaulus simonsenii, and Plagiogramma tenuissimum and added a new species for A. galaeciae. The type species selected for the new genus was Ambo tenuissimum, based on material from Lago de Maracaibo (Venezuela), the western Indian Ocean and the east coast of South Africa, and later also found to occur in the western Pacific margin.…”

Section: Introductionmentioning

confidence: 99%

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A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

Liu¹,

Wang²,

Wu³

et al. 2022

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Ambo dajingensis HH Liu, Z Wang, YH Gao & CP Chen, sp. nov. is described as a new species in samples collected from sand grains at Dajing Beach, Ningde City, Fujian Province, China. Morphological details of the new species with respect to valve shape, size and valve ultrastructure are presented based on light microscopy (LM) and scanning electron microscopy (SEM). The main features of Ambo dajingensis under a light microscope are elongated elliptic valves with rounded apices, two internal costae on the valve and rectangular in girdle views. SEM observation showed that externally, the frustules are comprised of two valves with a relatively deep mantle and a transition between the valve faces. Small, flabelliform spines are present along the valve margin. Internally, the valves are divided into three sectors by robust costae, which penetrate the whole valve lumen and are thickest at the mantle interior and thinner toward the center. The sternum is narrow and linear, visible only in the valve apex, set off by costae. The striae are comprised of small, round areolae and they are parallel in the middle to slightly radiate at the apices. The new species is compared with other species in the genus Ambo.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

Liu¹,

Wang²,

Wu³

et al. 2022

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“…The terminology used here for auxospores, and sexual stages conforms to Kaczmarska et al [ 25 ] while for frustule structure follows Anonymous [ 26 ] and Ross et al [ 27 ]. We refer to the internal cross-walls on the vegetative valves as “internal costae” sensu Witkowski et al [ 28 ].…”

Section: Methodsmentioning

confidence: 99%

“…Nearly all show "spines" (likely representing rimoportulae and/or occluded processes; pl. 118, figs 28,29). This type of sinuated, stocky elliptical valve morphotype and rimoportula arrangement has also been documented using SEM [12,30,31,32].…”

Section: Clone Identitymentioning

confidence: 97%

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

2022

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Phylogenetic relationships among mediophycean diatoms with elliptical valve outline and elevated apices have long been a subject of interest and debate, particularly with respect to their relationship to pennates. However, results remain inconclusive, whether based on vegetative valve morphology, reproduction, or molecular phylogenetic data. Searching for phylogenetically informative features, we re-examined sexual reproduction, auxospore structure and development in the diatom Biddulphia biddulphiana. Several unique or unusual features and processes characterized its sexual reproduction. A unique spermatogenesis occurs with premeiotic separation of an anucleate protoplast containing all chloroplasts and likely other organelles. Additionally, their auxospore walls are some of the most complex documented, retaining earlier deposited layers that obscure layers formed during later stages of development. The oldest layer consists of thick, mostly organic incunabulum, underlain by outer and inner epizonia and finally transverse (TP) and longitudinal (LP) perizonia. The complexity of the fine structure of these layers is unprecedented. The orientation of some TP bands is also unique in mediophytes, with some perpendicular to the auxospore apical axis, parallel to each other, and open with aligned ends, as typically seen in pennates. The TP also contains rings slanting toward the apices, as in some other mediophytes, e.g., eupodiscaceans. However, both eupodiscaceans and biddulphiaceans show perizonial band structure derived from anastomosing radial scales, thus termed “scaly bands”. Pinnate TP bands, common among pennate auxospores, were not found. Thus B. biddulphiana auxospore wall structure contains a mixture of characters specific to this clone but also known from mediophytes and araphid pennates. However, these features do not provide unequivocal evidence that this or the other Biddulphia species examined to date are the closest extant relatives of basal araphid pennates.

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Comparative Investigation of Marine Benthic Diatom Assemblages with Morphological and Metabarcoding Approaches Along the Coasts of Istanbul Metropolis

Kaleli,

Ozbayram,

Akcaalan

2023

Estuaries and Coasts

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Exploring Diversity, Taxonomy and Phylogeny of Diatoms (Bacillariophyta) from Marine Habitats. Novel Taxa with Internal Costae

Cited by 13 publications

References 31 publications

A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

Comparative Investigation of Marine Benthic Diatom Assemblages with Morphological and Metabarcoding Approaches Along the Coasts of Istanbul Metropolis

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Exploring Diversity, Taxonomy and Phylogeny of Diatoms (Bacillariophyta) from Marine Habitats. Novel Taxa with Internal Costae

Cited by 13 publications

References 31 publications

﻿A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

﻿A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

Comparative Investigation of Marine Benthic Diatom Assemblages with Morphological and Metabarcoding Approaches Along the Coasts of Istanbul Metropolis

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A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China

A new marine epipsammic diatom species, Ambo dajingensis sp. nov. (Bacillariophyceae), from the coast of Southeast China