Structure and Development of the Auxospore in Ardissonea crystallina (C. Agardh) Grunow Demonstrates Another Way for a Centric to Look Like a Pennate

Kaczmarska, Irena; Ehrman, James M.; Давидович, Н. А.; Давидович, О. И.; Podunay, Yu. A.

doi:10.1016/j.protis.2018.05.001

Cited by 8 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the type of ornamentation of the TP bands as a guide, we observe that the inner epizonial layer shows ornamentation similar to that seen on the perizonium, while ornamentation of the outer epizonial elements is much more diverse. Some are similar to incunabular scales [ 16 ] and straps (see vincula in Ardissonea ; [ 43 ]), but others are comparable to pinnate bands in the TP of pennate diatoms ( Rhoicosphenia ; [ 44 ], Gephyria ; [ 45 ], Grammatophora ; [ 46 ]). In eupodiscacean species, the epizonium may be absent ( Odontella aurita (Lyngbye) C. Agardh) or present only at the auxospore apices ( Trieres regia (M. Schultze) Ashworth & E.C.…”

Section: Discussionmentioning

confidence: 99%

“…In the eupodiscacean species examined, TP bands show a stronger non-perpendicular configuration and non-aligned ends [ 2 ]. Among other mediophyte species, TP bands oriented perpendicularly to the auxospore apical axis are known in only one species, the exceptionally long bipolar centric diatom Ardissonea crystallina [ 42 , 43 ]. Open bands with aligned ends and perpendicular orientation relative to the cell apical axis are typical of pennate auxospores [ 2 , 42 ].…”

Section: Discussionmentioning

confidence: 99%

“…Nonetheless, the overall development and structure of our auxospores conform to those of mediophyceans. The auxospores of the exceptionally long diatom Ardissonea crystallina [ 43 ] are more similar in overall morphology to pennate auxospores than are those of our clone or any known Eupodiscacean.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

2022

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sexual reproduction of A. crystallina (Agardh) Grunow ex De Toni, 1892 has similarities to that of Fragilariophyceae in being isogamous ( Davidovich et al 2017 ) and in morphology of its auxospores ( Kaczmarska et al 2018 ), yet the valve morphogenesis reinforces its position among Mediophyceae ( Kaczmarska et al 2020 ). Gliding motility is present in these diatoms, even though they lack a raphe—the structure usually associated diatom motility—and even though they are habitually sessile on mucilage stalks.…”

Section: Introductionmentioning

confidence: 99%

Revision of Ardissoneaceae (Bacillariophyta, Mediophyceae) from Micronesian populations, with descriptions of two new genera, Ardissoneopsis and Grunowago, and new species in Ardissonea, Synedrosphenia and Climacosphenia

Lobban¹,

Ashworth²,

Camacho³

et al. 2022

View full text Add to dashboard Cite

Ardissonea was resurrected from Synedra in 1986 and was included as a genus by Round, Crawford and Mann (“The Diatoms”) in its own Family and Order. They commented that there might be several genera involved since the type species of the genus possesses a double-walled structure and other taxa placed in Ardissonea have only a single-walled structure. Two other genera of “big sticks,” Toxarium and Climacosphenia, were placed in their own Families and Orders but share many characters with Ardissoneaceae, especially growth from a bifacial annulus. Eighteen taxa (11 new species) from Micronesia were compared with the literature and remnant material from Grunow’s Honduras Sargassum sample to address the concepts of Ardissonea and Ardissoneaceae. Phylogenetic and morphological analyses showed three clades within Ardissonea sensu lato: Ardissonea emend. for the double-walled taxa, Synedrosphenia emend. and Ardissoneopsisgen. nov. for single-walled taxa. New species include Ardissonea densistriatasp. nov.; Synedrosphenia bikarensissp. nov., S. licmophoropsissp. nov., S. parvasp. nov., and S. rectasp. nov.; Ardissoneopsis fulgicanssp. nov., A. appressatasp. nov., and A. gracilissp. nov. Transfers include Synedrosphenia crystallinacomb. nov. and S. fulgenscomb. nov. Synedra undosa, seen for the first time in SEM in Grunow’s material, is transferred to Ardissoneopsis undosacomb. nov. Three more genera have similar structure: Toxarium, Climacosphenia and Grunowagogen. nov., erected for Synedra bacillaris and a lanceolate species, G. pacificasp. nov. Morphological characters of Toxarium in our region support separation of Toxarium hennedyanum and T. undulatum and suggest additional species here and elsewhere. Climacosphenia moniligera was not found but we clarify its characters based on the literature and distinguish C. soulonalissp. nov. from it. Climacosphenia elongata and a very long, slender C. elegantissimasp. nov., previously identified as C. elongata, were present along with C. scimiter. Morphological and molecular phylogenetics strongly suggested that all these genera belong in one family and we propose to include them in the Ardissoneacae and to reinstate the Order Ardissoneales Round.

show abstract

“…There are several types of perizonial bands in diatoms, and they might have evolved independently within the polar centrics and then again within pennates. Most recently, a novel manner of development of transverse perizonial bands was documented in the unusually elongated, pennate-like polar centric diatom Ardissonea crystallina (Kaczmarska et al 2018). This and previously postulated hypotheses (von Stosch 1982) have raised interest in the structure of perizonial bands in polar diatoms, both centric and pennate.…”

Section: Introductionmentioning

confidence: 99%

Auxospore wall structure and postsexual valve morphology in Rhabdonema minutum Kützing

Kaczmarska

Ehrman

2019

Plant and Fungal Systematics

Self Cite

View full text Add to dashboard Cite

Several decades ago, three members of the araphid pennate genus Rhabdonema (R. adriaticum, R. arcuatum, R. minutum) were the first araphid diatoms studied using cultures and electron microscopical methods to determine auxospore structure and development. Of these, R. minutum was the least documented at that time. None have been reinvestigated until now. Here we present the structural elements of the mature auxospore and the initial and postsexual valve characteristics of R. minutum. Although in general the auxospore wall of this diatom is similar to that of the two other species examined (to the extent that they were documented), there are intriguing differences. Most unanticipated is the structure of the primary band of the longitudinal perizonium, which shows remarkable similarities to the raphid pennate diatom valve. The evolutionary implications of such a similarity are considered.

show abstract

Structure and Development of the Auxospore in Ardissonea crystallina (C. Agardh) Grunow Demonstrates Another Way for a Centric to Look Like a Pennate

Cited by 8 publications

References 32 publications

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

Revision of Ardissoneaceae (Bacillariophyta, Mediophyceae) from Micronesian populations, with descriptions of two new genera, Ardissoneopsis and Grunowago, and new species in Ardissonea, Synedrosphenia and Climacosphenia

Auxospore wall structure and postsexual valve morphology in Rhabdonema minutum Kützing

Contact Info

Product

Resources

About

Structure and Development of the Auxospore in Ardissonea crystallina (C. Agardh) Grunow Demonstrates Another Way for a Centric to Look Like a Pennate

Cited by 8 publications

References 32 publications

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana

﻿Revision of Ardissoneaceae (Bacillariophyta, Mediophyceae) from Micronesian populations, with descriptions of two new genera, Ardissoneopsis and Grunowago, and new species in Ardissonea, Synedrosphenia and Climacosphenia

Auxospore wall structure and postsexual valve morphology in Rhabdonema minutum Kützing

Contact Info

Product

Resources

About

Revision of Ardissoneaceae (Bacillariophyta, Mediophyceae) from Micronesian populations, with descriptions of two new genera, Ardissoneopsis and Grunowago, and new species in Ardissonea, Synedrosphenia and Climacosphenia