Simocephalus Vetulus

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hkv
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Simocephalus Vetulus

#1 Post by hkv » Thu May 25, 2017 8:13 am

I found a rather big Simocephalus Vetulus in a recently collected water sample. She turned out to have small females under her carapace. In females, there is a large space between the back and the dorsal side of the carapace that functions as a brood pouch. I can spot at least 10 small females. Simocephalus Vetulus reproduces parthenogenetically most of the year (producing females).

Polarized light with 4X objective, size of the animal is just below 3 mm:

Image


Fluorescent light with 4X objective:

Image

Close-up with the 10X objective. Fluorescent light. Showing the small females (which were moving around)

Image

The last image is a smaller female, just below 1 mm. In "poor man's" darkfield. I did not use a proper darkfield stop because I did not have one mounted in the condenser turret, but I instead set the condenser between two DIC positions having the metal frames of the DIC prisms act as a darkfield stop. Not very sophisticated, but I was somewhat surprised how well it worked.

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vasselle
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Re: Simocephalus Vetulus

#2 Post by vasselle » Thu May 25, 2017 9:34 am

Bonjour.
Superbes photos clair et nette.
Merci pour le partage.
Cordialement seb
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75RR
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Re: Simocephalus Vetulus

#3 Post by 75RR » Thu May 25, 2017 10:19 am

Yet more wonderful images ...
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mrsonchus
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Re: Simocephalus Vetulus

#4 Post by mrsonchus » Thu May 25, 2017 10:46 am

Stunning images! I've never seen better old chap. Not my area, but WOW - these are simply sublime! :)
John B

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rabitt
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Re: Simocephalus Vetulus

#5 Post by rabitt » Thu May 25, 2017 12:13 pm

Wonderful photos, another excellent subject / critter to study.

charlie g
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Re: Simocephalus Vetulus

#6 Post by charlie g » Thu May 25, 2017 6:36 pm

Fantastic life cycle encounter, hkv. A few weeks ago (with the lamb still in the oven), we had candy decorations just like that your cladocerans happy brood...we call these candies: "Peeps", Easter season confections!

Your 'peeps' come in similar colors,hkv! charlie guevara

Manfred
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Re: Simocephalus Vetulus

#7 Post by Manfred » Thu May 25, 2017 6:55 pm

Outstanding images Hakan

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Re: Simocephalus Vetulus

#8 Post by JimT » Thu May 25, 2017 10:53 pm

I can only echo all of the above. Well done.

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hkv
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Re: Simocephalus Vetulus

#9 Post by hkv » Fri May 26, 2017 8:04 am

Thanks all for looking and for your kind comments!
Flickr: https://www.flickr.com/photos/micromundus
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Cyclops
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Re: Simocephalus Vetulus

#10 Post by Cyclops » Fri Jun 09, 2017 10:25 pm

Fantastic imaged!

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KurtM
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Re: Simocephalus Vetulus

#11 Post by KurtM » Sat Jun 10, 2017 1:29 am

Your "poor man's darkfield" worked out very well indeed, that's a superb image. Maybe not "orthodox", but superb all the same. I'd remember the "recipe" if I were you! 8-)
Cheers,
Kurt Maurer
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hkv
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Re: Simocephalus Vetulus

#12 Post by hkv » Sun Jun 11, 2017 7:45 pm

Thanks Cyclops and Kurt! Yes, I was surprised myself how the condenser could be "misused" and still getting decent DF.
Flickr: https://www.flickr.com/photos/micromundus
Youtube: https://www.youtube.com/channel/UC0UdYN ... YH_litDZjA
Instagram: https://www.instagram.com/micromundusphotography
Olympus BX51 | Olympus SZ4045 | Carl Zeiss Jena Sedival | Swift FM-31

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