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
discoides
gibba
cassis
elongata
oblonga
bathystoma
capreolata
var. masurica
globulosa
truncata
parva
globularis
fimbriata
chinensis
wailesii
concinnus
filifera
lineare
urceolata
enchelys
oblonga
artocrea
crenulata
spec.
brevicolla
placentula
var. euglypta
bryophila
spiralis
galeata
mitrata
gibbosa
didelta
immanata
acuminata
granulata
mucosa
var. laevicincta
rectum
bacillifera
brevicaulis
nasutum
striolatum
teliferum
pseudopyramidatum