Observations on Melosira lineata
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Melosira lineata (Dillwyn) C.Agardh 1824
Most likely ID: n.a.
Basionym: Conferva lineata Dillwyn 1809
Add’l Synonyms: Melosira juergensii C.Agardh 1824
Gaillonella juergensii (C.Agardh) Gaillon 1833
Gaillonella lineata (Dillwyn) Bory 1838
Lysigonium lineatum (Dillwyn) Trevisan 1848
Lysigonium juergensii (C.Agardh) Trevisan 1848
Melosira lineata var. genuina A.Cleve 1951
Melosira juergensii var. genuina A.Cleve 1951
Four images. Girdleband view.
Sampling date 1/2022.
Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!
Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany)
Latitude: 54.3894126 Longitude: 10.1749055
Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.
The sexual reproduction of centric diatoms (Centrales) is characterized by oogamy. In Melosira, the spermatozoids are formed in narrower, the oogonia in broader filaments. After meiosis, four mobile spermatozoa with one flagellum develop in the male gamete mother cells (antheridia), in each of the oogonia three meiotic nuclei collaps and only one egg cell capable of fertilization remains.
The images show the flagella and a golden brown chloroplast (color due to the accessory dye fucoxanthin) at the posterior end of the spermatozoids.
After Krammer, K. and van den Hoek, C.
Sampling date 1/2022.
11 images, five pairs of images, each with and without reference arrows.
First couple: | Three spermatozoids (arrowhead) in the transparent cells in the upper right corner. |
Second couple: | The flagellum (arrow) becomes visible. |
Third to fifth couple: | The arrow points to the flagellum, the double arrowhead to the golden brown chloroplast. |
11. image: | A spermatozoid is leaving the mother cell. |
Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!
Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany)
Latitude: 54.3894126 Longitude: 10.1749055
Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.
© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.
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New items
crassa
digitus
var. lamellosum
digitus
var. latum
oblongum
interruptum
spec.
spec.
kinahanii
spec.
polymorphum
var. polymorphum
spec.
spirostriolatum
digitus
brebissonii
rotata
swartzii
capitulum
antilopaeum
neosinuosum
brebissonii
pachydermum
thomasiana
var. notata
ansatum
forficulatum
var. verrucosum
neodepressum
armatum
oblongum
porteanum
truncata
rhomboidale
furcatum
uncinatum
dissiliens
pseudonitidulum
var. validum
truncata
var. bahusiensis
bidentatum
hirsutum
cucurbitinum
minor
pyramidatum
truncata
var. quadrata
binale
var. gutwinskii
inconspicuum
borreri
americana
quadratulum
trabecula
var. elongatum
coeseli
margaritacaeum
bicuneatum
apiculata
simplicius
crenulatum
crassum
simonyi
var. sparsiaculeatum
caelatum
crux-melitensis
sparsepunctatum
ehrenbergii
didelta
spongiosum
var. perbifidum
connatum
denticulata
subarctoum
trabecula
var. trabecula
humerosum
teliferum
dejectus
spec.
conspersum
komarekii
papillifera
arboricola
venustum
var. excavatum
viridis
pulchellum
tripus
granulatus
var. granulatus
subspicatus
humerosum
var. affine
nostochinearum
convergens
arcuata
integrum
aureus
rotata
lunaris
grevillei
lunatus
alternans
irregularis
laevis
var. laevis
ehrenbergianum
luetkemuelleri
var. carniolicum
reticulatum
tetras
limneticum
viridis
cystozygote
tetrachotoma
simplex
var. sturmii
biradiatum
microporum
var. octaedricum
braunii
reinhardtii
pusillum
lacustris
speculum
diaphanum