<i>STEPHANODISCUS GALILEENSIS</i>SP.NOV. FROM HOLOCENE SUBSURFACE SEDIMENTS OF LAKE KINNERET, ISRAEL

Håkansson, Håkan; Ehrlich, Aline

doi:10.1080/0269249x.1987.9704981

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…Strongly concentric valve undulations a distinct marginal hyaline ring and marginal spines are all lacking in S. neoaegypticus sensu lato. The morphological characteristics of S. galileensis obtained from the Qarun core material compare favourably with the published data for this species (Håkansson & Ehrlich 1987) shown in Table 2. The original description and the existence of heterovalvy is generally substantiated and only very minor differences were found in this study.…”

Section: New Species Descriptionssupporting

confidence: 76%

“…23). Fascicles on these valves (morphotype 'B' of Håkansson & Ehrlich 1987) appear to contain finer areolae and are biseriate for about half the valve distal radius. In this region, interfascicles are often about 1 µm broad but in strongly silicified specimens the width is similar to those in valves with hyaline sub-marginal rings.…”

Section: Resultsmentioning

confidence: 99%

“…26) with either two or three satellite pores. The mantle areolae, cribra and fultoportulae are generally as in Håkansson & Ehrlich (1987) except in this material the number of central area processes is lower. The concave valves confirm heterovalvy (Fig.…”

Section: New Species Descriptionsmentioning

confidence: 95%

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Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)

Flower¹,

Keatings²,

Hamdan³

et al. 2013

Phytotaxa

679

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Lake Qarun in the Egyptian Faiyum Depression is the shrunken remnant of a much larger lake. To investigate the sedimentary history of the former lake, several continuous lacustrine sediment cores were collected from now terrestrial locations within the basin. The suitability of these sediments for reconstructing past environmental changes was first assessed by describing the gross stratigraphies of three core sequences and secondly by evaluating taxonomic issues concerning sedimentary diatom species within the genus, Stephanodiscus Ehr. The stratigraphic descriptions show basal sections comprised of either coarse sand or weathered Ecocene limestone overlain by lacustrine sediments. Lower sections of the lacustrine sediments are diatom marls, and, in the two lakeside cores, these are laminated. These sections indicate that the lake initially formed by rapid in filling to a considerable depth with freshwater and the diatom-rich marls containing abundant Stephanodiscus and Aulacoseira Thwaites species. A new species and variety of Stephanodiscus, S. neoaegypticus and S. neoaegypticus var. fekrii, are described from the marl section in one core. Another species, S. galileenis Håkansson & Erhlich, was also present and is re-evaluated with reference to the published description. The importance of establishing a sound taxonomic foundation for palaeolimnological studies of Lake Qarun is stressed.

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Section: New Species Descriptionssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

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Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)

Flower¹,

Keatings²,

Hamdan³

et al. 2013

Phytotaxa

679

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“…PollingHeR et al (1984) analysed the changing character of planktonic diatoms in Lake Kinneret over the last 5000 yrs and eHRliCH (1985) carried out a paleoecological assessment of recent environmental change in the diatom flora of five short cores. This included the description of two new planktonic species: Cyclotella polymorpha meyeR et Håkansson and Stephanodiscus galileensis Håkansson et eHRliCH (Håkansson & eHRliCH 1987;meyeR & Håkansson 1996). eHRliCH (1985) also observed a third unknown centric diatom which she denoted as Cyclotella sp.…”

Section: Methodsmentioning

confidence: 99%

Cyclotella paleo-ocellata, a new centric diatom (Bacillariophyta) from Lake Kinneret (Israel)

Vossel¹,

Reed²,

Houk³

et al. 2015

Fottea

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Large, subfossil populations of an unknown centric, planktonic diatom were observed in a lake sediment core from Lake Kinneret (Israel), which is here described as Cyclotella paleo-ocellata sp. nov. The new taxon, which belongs to the Cyclotella ocellata species complex, is described and separated from other similar taxa (e.g., Cyclotella ocellata, Cyclotella kuetzingiana, Cyclotella polymorpha, Cyclotella paraocellata) based on a combination of the following morphological characters: valve diameter, number of orbiculi depressi (circular depressions), number of striae/10 µm, stria length, number and position of rimoportulae and the number of central and marginal fultoportulae. Cyclotella paleo-ocellata can be distinguished mainly by two prominent characteristics: (1) the number and the arrangement of the orbiculi depressi (4-8) which increase with the valve diameter and (2) the marginal fultoportulae, situated on each, every second or third costa. Since Cyclotella paleo-ocellata is at present only known from the subfossil bottom sediments of Lake Kinneret, its ecological preferences are inferred simply from the associated diatom flora.

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A LIGHT AND ELECTRON MICROSCOPE STUDY OF PREVIOUSLY DESCRIBED AND NEWSTEPHANODISCUSSPECIES (BACILLARIOPHYCEAE) FROM CENTRAL AND NORTHERN CANADIAN LAKES, WITH ECOLOGICAL NOTES ON THE SPECIES

Håkansson

Kling

1989

Diatom Research

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STEPHANODISCUS GALILEENSISSP.NOV. FROM HOLOCENE SUBSURFACE SEDIMENTS OF LAKE KINNERET, ISRAEL

Cited by 10 publications

References 1 publication

Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)

Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)

Cyclotella paleo-ocellata, a new centric diatom (Bacillariophyta) from Lake Kinneret (Israel)

A LIGHT AND ELECTRON MICROSCOPE STUDY OF PREVIOUSLY DESCRIBED AND NEWSTEPHANODISCUSSPECIES (BACILLARIOPHYCEAE) FROM CENTRAL AND NORTHERN CANADIAN LAKES, WITH ECOLOGICAL NOTES ON THE SPECIES

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