LII.—On Okedenia, Eul.

Abstract

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Climaconeisspecies (Bacillariophyceae: Berkeleyaceae) from western Pacific islands, includingC. petersoniisp. nov. andC. guamensissp. nov., with emphasis on the plastids

“…Although Mereschkowsky (1901) showed ''pairs of H-shaped chloroplasts'' (as stated by Cox in her emended description), the H shape, in girdle view, has not been seen in recent studies, nor in the present study with one possible exception. In most cells the two plates are close together and there may be some more or less distinct material between them, as illustrated also in Cox's (1979) drawing of C. scalaris.…”

“…The cells described here are within the ranges of C. inflexa as described by Mereschkowsky (1901) and Cox (1982). Cell shape, plastid shape and stria density distinguish it from C. riddleae and C. guamensis (Table 2).…”

“…The history of the H-shaped plastid dates back to Mereschkowsky (1901), whose interest in plastids led him to develop the first endosymbiont hypothesis of plastid origin (Martin & Kowallik, 1999). He resurrected Okedenia Eulenstein on the basis of H-shaped plastids with large pyrenoids, including taxa that were then known as Amphora inflexa (Bre´bisson ex Ku¨tzing) H.L.…”

Extreme Enlargement of the Inverted Repeat Region in the Plastid Genomes of Diatoms from the Genus Climaconeis

“…The type material, previously described as Frustulia scalaris, comes from Calvados, a French Department in Normandy, located near the English Channel [13]. It was also observed in Honduras as Berkeleya scalaris [9] and in the Black Sea as Okedenia scopulorum [14].…”

Marine necklace‐chain Fragilariaceae (Bacillariophyceae) from Guam, including descriptions of Koernerella and Perideraion, genera nova

“…We recognize that plastids are not necessarily a reliable taxonomic character. Plastids have rarely been used as genus indicators in diatoms since the early‐20 th century (Mereschkowsky 1901, 1903) but have been promoted more recently by Cox (Cox 1981; Cox & Williams 2006) and Snoeijs (1992) as potentially useful to supplement frustule characters in identification. For example, Cox (1979) used plastid number and shape to distinguish two taxa ( Berkeleya scopulorum (Brébisson) Cox and Climaconeis scalaris (Brébisson) Cox) that were almost indistinguishable even in the electron microscope.…”