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A Description of Biremis panamae sp. nov., a New Diatom Species from the Marine Littoral, with an Account of the Phylogenetic Position of Biremis D.G. Mann et E.J. Cox (Bacillariophyceae).

Witkowski A, Barka F, Mann DG, Li C, Weisenborn JL, Ashworth MP, Kurzydłowski KJ, Zgłobicka I, Dobosz S - PLoS ONE (2014)

Bottom Line: Our results based on these three sources point to an evolutionary relationship between Biremis, Neidium and Scoliopleura.The unusual silicified incunabular caps present in them are known otherwise only in Muelleria, which is probably related to the Neidiaceae and Scoliotropidaceae.We also discuss the relationship between Biremis and the recently described Labellicula and Olifantiella.

View Article: PubMed Central - PubMed

Affiliation: Palaeoceanology Unit, Faculty of Geosciences, University of Szczecin, Mickiewicza 18, PL-70-383, Szczecin, Poland.

ABSTRACT
Here we present a formal description of Biremis panamae Barka, Witkowski et Weisenborn sp. nov., which was isolated from the marine littoral environment of the Pacific Ocean coast of Panama. The description is based on morphology (light and electron microscopy) and the rbcL, psbC and SSU sequences of one clone of this species. The new species is included in Biremis due to its morphological features; i.e. two marginal rows of foramina, chambered striae, and girdle composed of numerous punctate copulae. The new species also possesses a striated valve face which is not seen in most known representatives of marine littoral Biremis species. In this study we also present the relationship of Biremis to other taxa using morphology, DNA sequence data and observations of auxosporulation. Our results based on these three sources point to an evolutionary relationship between Biremis, Neidium and Scoliopleura. The unusual silicified incunabular caps present in them are known otherwise only in Muelleria, which is probably related to the Neidiaceae and Scoliotropidaceae. We also discuss the relationship between Biremis and the recently described Labellicula and Olifantiella.

No MeSH data available.


Related in: MedlinePlus

Biremis panamae sp. nov., SEM: internal valve views.A. Specimen with corroded chambers. B. An uneroded specimen with well preserved chambers; note the presence of a double helictoglossa (arrowhead) between the central raphe endings. C, D. Close up of the specimen illustrated in Fig. 6B: note the narrow elevated virgae, separated by depressed areolae.
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pone-0114508-g006: Biremis panamae sp. nov., SEM: internal valve views.A. Specimen with corroded chambers. B. An uneroded specimen with well preserved chambers; note the presence of a double helictoglossa (arrowhead) between the central raphe endings. C, D. Close up of the specimen illustrated in Fig. 6B: note the narrow elevated virgae, separated by depressed areolae.

Mentions: Fig. 6A–D.The valve surface is flat internally, with depressed striae separated by raised virgae, except at the side of the valve, where there is a line of distinct chambers forming a tubular structure. The tube of chambers extends almost to the valve apex. Each chamber is aligned with a stria (see the eroded specimens in Fig. 6A and the complete specimen in Fig. 6B) and eroded specimens (Fig. 6A) show that it extends from the edge of one valve face areola, beneath the hyaline strip at the margin of valve face and mantle, to the valve margin; it opens to the exterior by two foramina (compare Fig. 4A–C). In other Biremis species, the interior wall of the chambers is porous (e.g. [1]) but we did not detect pores in our material. The raphe-sternum is somewhat elevated internally and the raphe slit is straight and simple. The internal central endings are simple and coaxial and terminate in a ‘double helictoglossa’, i.e. a slightly elongate, almost beak-like mass of silica capping the raphe slits. Likewise, the apical internal endings terminate in a very small and simple helictoglossa (Fig. 6A–D).


A Description of Biremis panamae sp. nov., a New Diatom Species from the Marine Littoral, with an Account of the Phylogenetic Position of Biremis D.G. Mann et E.J. Cox (Bacillariophyceae).

Witkowski A, Barka F, Mann DG, Li C, Weisenborn JL, Ashworth MP, Kurzydłowski KJ, Zgłobicka I, Dobosz S - PLoS ONE (2014)

Biremis panamae sp. nov., SEM: internal valve views.A. Specimen with corroded chambers. B. An uneroded specimen with well preserved chambers; note the presence of a double helictoglossa (arrowhead) between the central raphe endings. C, D. Close up of the specimen illustrated in Fig. 6B: note the narrow elevated virgae, separated by depressed areolae.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4262420&req=5

pone-0114508-g006: Biremis panamae sp. nov., SEM: internal valve views.A. Specimen with corroded chambers. B. An uneroded specimen with well preserved chambers; note the presence of a double helictoglossa (arrowhead) between the central raphe endings. C, D. Close up of the specimen illustrated in Fig. 6B: note the narrow elevated virgae, separated by depressed areolae.
Mentions: Fig. 6A–D.The valve surface is flat internally, with depressed striae separated by raised virgae, except at the side of the valve, where there is a line of distinct chambers forming a tubular structure. The tube of chambers extends almost to the valve apex. Each chamber is aligned with a stria (see the eroded specimens in Fig. 6A and the complete specimen in Fig. 6B) and eroded specimens (Fig. 6A) show that it extends from the edge of one valve face areola, beneath the hyaline strip at the margin of valve face and mantle, to the valve margin; it opens to the exterior by two foramina (compare Fig. 4A–C). In other Biremis species, the interior wall of the chambers is porous (e.g. [1]) but we did not detect pores in our material. The raphe-sternum is somewhat elevated internally and the raphe slit is straight and simple. The internal central endings are simple and coaxial and terminate in a ‘double helictoglossa’, i.e. a slightly elongate, almost beak-like mass of silica capping the raphe slits. Likewise, the apical internal endings terminate in a very small and simple helictoglossa (Fig. 6A–D).

Bottom Line: Our results based on these three sources point to an evolutionary relationship between Biremis, Neidium and Scoliopleura.The unusual silicified incunabular caps present in them are known otherwise only in Muelleria, which is probably related to the Neidiaceae and Scoliotropidaceae.We also discuss the relationship between Biremis and the recently described Labellicula and Olifantiella.

View Article: PubMed Central - PubMed

Affiliation: Palaeoceanology Unit, Faculty of Geosciences, University of Szczecin, Mickiewicza 18, PL-70-383, Szczecin, Poland.

ABSTRACT
Here we present a formal description of Biremis panamae Barka, Witkowski et Weisenborn sp. nov., which was isolated from the marine littoral environment of the Pacific Ocean coast of Panama. The description is based on morphology (light and electron microscopy) and the rbcL, psbC and SSU sequences of one clone of this species. The new species is included in Biremis due to its morphological features; i.e. two marginal rows of foramina, chambered striae, and girdle composed of numerous punctate copulae. The new species also possesses a striated valve face which is not seen in most known representatives of marine littoral Biremis species. In this study we also present the relationship of Biremis to other taxa using morphology, DNA sequence data and observations of auxosporulation. Our results based on these three sources point to an evolutionary relationship between Biremis, Neidium and Scoliopleura. The unusual silicified incunabular caps present in them are known otherwise only in Muelleria, which is probably related to the Neidiaceae and Scoliotropidaceae. We also discuss the relationship between Biremis and the recently described Labellicula and Olifantiella.

No MeSH data available.


Related in: MedlinePlus