Obelia Hydrozoa "jellyfish"

Here you can post pictures and videos to show others.
Post Reply
Message
Author
Sabatini
Posts: 464
Joined: Tue Nov 12, 2019 3:09 am

Obelia Hydrozoa "jellyfish"

#1 Post by Sabatini » Mon Sep 14, 2020 9:44 pm

Hello.
I found these beautiful specimens in some abandoned fishing nets on the seashore. I put them under the Mitutoyo fs100 and with MplanApos 10x and 20x. Too bad my camera is a simple cell phone, but the images directly from the eyepiece are very satisfying.
IMG_20200914_161215.jpg
IMG_20200914_161215.jpg (54.35 KiB) Viewed 2385 times
IMG_20200914_161420.jpg
IMG_20200914_161420.jpg (37.92 KiB) Viewed 2385 times
IMG_20200914_161554.jpg
IMG_20200914_161554.jpg (84.47 KiB) Viewed 2385 times
IMG_20200908_194612.jpg
IMG_20200908_194612.jpg (55.88 KiB) Viewed 2385 times
Screenshot_2020-09-08-19-36-06-470_com.google.android.apps.photos~2.jpg
Screenshot_2020-09-08-19-36-06-470_com.google.android.apps.photos~2.jpg (30.27 KiB) Viewed 2382 times
Last edited by Sabatini on Tue Sep 15, 2020 9:15 pm, edited 2 times in total.

Sabatini
Posts: 464
Joined: Tue Nov 12, 2019 3:09 am

Re: Obelia Hydrozoa Polyps

#2 Post by Sabatini » Mon Sep 14, 2020 9:51 pm

Screenshot_2020-09-08-19-36-11-293_com.google.android.apps.photos~2.jpg
Screenshot_2020-09-08-19-36-11-293_com.google.android.apps.photos~2.jpg (43.29 KiB) Viewed 2381 times

Sabatini
Posts: 464
Joined: Tue Nov 12, 2019 3:09 am

Re: Obelia Hydrozoa Polyps

#3 Post by Sabatini » Mon Sep 14, 2020 9:52 pm

Screenshot_2020-09-08-19-36-46-914_com.google.android.apps.photos~2.jpg
Screenshot_2020-09-08-19-36-46-914_com.google.android.apps.photos~2.jpg (54.09 KiB) Viewed 2381 times

User avatar
tabkiel
Posts: 51
Joined: Mon Sep 14, 2020 10:57 am
Location: São Paulo, Brazil
Contact:

Re: Obelia Hydrozoa

#4 Post by tabkiel » Tue Sep 15, 2020 1:20 pm

Super cool pictures!! I've always wanted to see hydras, are they exclusive to saltwater or are there freshwater species too? Also, are you using a filter to make the backdrop purple? Looks great :D

~ Tenshi
This is my 'spirit', my 'intellect'. I am alive.

Sabatini
Posts: 464
Joined: Tue Nov 12, 2019 3:09 am

Re: Obelia Hydrozoa

#5 Post by Sabatini » Tue Sep 15, 2020 3:42 pm

Tabkiel.
Thank you for your kind comment.
You can also find them in Lakes and Rivers. They are very interesting creatures.
The technique I use is Polarized Light.

User avatar
Wes
Posts: 1027
Joined: Sat Mar 09, 2019 12:58 pm

Re: Obelia Hydrozoa

#6 Post by Wes » Tue Sep 15, 2020 4:39 pm

These are quite interesting I agree, its amazing that you can find them in freshwater too.

Did you use a compensator to get the magenta background?
Zeiss Photomicroscope III BF/DF/Pol/Ph/DIC/FL/Jamin-Lebedeff
Youtube channel

Sabatini
Posts: 464
Joined: Tue Nov 12, 2019 3:09 am

Re: Obelia Hydrozoa

#7 Post by Sabatini » Tue Sep 15, 2020 6:20 pm

Wes wrote:
Tue Sep 15, 2020 4:39 pm
These are quite interesting I agree, its amazing that you can find them in freshwater too.

Did you use a compensator to get the magenta background?
Wes.
Hydrozoa in general can be found in different water bodies.
This class in particular, only in the sea.

"Obelia, genus of invertebrate marine animals of the class Hydrozoa (phylum Cnidaria). The genus, widely distributed in all the oceans, is represented by many species. The animal begins life as a polyp—a tentacled, stalklike form resembling a small sea anemone attached to the ocean bottom or some other solid surface. The polyp asexually produces medusae, or jellyfish. Obelia medusae release sperm or eggs into the surrounding water, and the resulting ciliated larva eventually metamorphoses to produce a branching colony of polyps."

In connection with this explanation I found in the same sample taking ,what looks like a young jellyfish, still adjacent to the polyps

https://youtu.be/sLUB3Gfx2R0

Post Reply