Biremis ridicula (Giffen) D.G. Mann

Lobban, Christopher S. & Witkowski, Andrzej, 2023, Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist, Micronesica 2023 (2), pp. 1-75 : 6-7

publication ID

https://doi.org/ 10.5281/zenodo.12118784

DOI

https://doi.org/10.5281/zenodo.12581850

persistent identifier

https://treatment.plazi.org/id/03C287AA-FFF9-0B01-FF35-7B6EFD68FD4F

treatment provided by

Felipe

scientific name

Biremis ridicula (Giffen) D.G. Mann
status

 

Biremis ridicula (Giffen) D.G. Mann Figs 32–37 View Figures 32–38

Ref. illus.: Giffen 1976, figs 10–13 (as Amphora ridicula ); Round et al. 1990 pp. 548–549 (figs c, d, but not identified to species); Witkowski et al. 2000, pl. 154, figs 14–16

Samples: GU52O-4

Dimensions: Length 46–74 µm, width of valve 9 µm, width of frustule in girdle view 24 µm; striae 7 in 10 µm

Diagnostics: Amphora -like frustule, asymmetrical ( Figs 32, 35 View Figures 32–38 ). Valve asymmetrical ( Figs 34, 36 View Figures 32–38 ), lanceolate, with short, broad striae along each margin and the raphe strongly displaced to the “ventral” striae, leaving strongly asymmetrical axial area. Striae alveolate ( Fig. 37 View Figures 32–38 ).

Comments: This species is similar in size and stria density to Biremis ambigua (see above), but that species is symmetrical. The relatively large frustules are shaped like Amphora arenaria Donkin , with which it co-occurred in this sample from calcareous sand, but the striae are very distinctive. Round et al. (1990) described the areolae in this genus as consisting of two incompletely separated chambers, closed internally by a cribrum, and opening externally by slit-like foramina, one at each end of the areola, resulting in two longitudinal lines that are the most evident feature in external SEM views. Witkowski et al. (2000) mention this species being reported only from South Africa and the North Sea (Europe), populations for which there is no SEM yet; a comparison needs to be made to confirm the identity of the Guam specimens.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Terebellidae

Genus

Biremis

Loc

Biremis ridicula (Giffen) D.G. Mann

Lobban, Christopher S. & Witkowski, Andrzej 2023
2023
Loc

Amphora ridicula

Giffen 1976
1976
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