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Old 23rd March 2019
Harold Gough Harold Gough is offline
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Monobella grassei

This is one of the slower-moving, non-jumping Collembola. Its deep yellow to orange colour identifies it, together with its plumpness, the coarse granulation of the skin and some of the longer body hairs. The immatures are much paler. There are two, tiny, faintly-marked eyes on each side of the head, one much further back that the other. (See second image).

These were on the underside of some apple bark. The bark had been peeling from a dead apple tree for many months but had only recently been torn off by very strong winds and deposited on nearby, rough grass. The large, circular object in the bottom left of the second image is the remains of the base of a long-dead twig.

I found it two years ago on rotting logs. The images I found then were with different optics and were not so good.

https://www.fredmiranda.com/forum/to...6502/#14245993

Working at such high (but varied) magification (FOV typically 5mm wide) gives little DOF, even at nominal f11 or f16.

Some of these were with twin flash some with single. Getting light on the subject with the lens working distance around 20mm precluded using my usual three guns. Turning a piece of detached bark to keep up with the constantly-walking subjects and relocating them in the frame, added difficulty. So the sessions were long.

Olympus EM-1 (manual mode), Leitz Wetzlar Photar 25mm f2.5 macro at f11 or f16, single or twin TTL flash, hand-held with support.

Harold








A half-grown individual.


Very immature ones.
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Old 23rd March 2019
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Zuiko Zuiko is offline
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Re: Monobella grassei

Fascinating, I never knew these creatures even existed!
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Old 23rd March 2019
Harold Gough Harold Gough is offline
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Re: Monobella grassei

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Originally Posted by Zuiko View Post
Fascinating, I never knew these creatures even existed!
John,

They've been around a while:

http://www.fossilmuseum.net/Fossil_G...ct_gallery.htm

Harold
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Old 23rd March 2019
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Re: Monobella grassei

Very nice Harold not a species I have seen myself

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Old 23rd March 2019
Harold Gough Harold Gough is offline
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Re: Monobella grassei

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Originally Posted by alfbranch View Post
Very nice Harold not a species I have seen myself
Thanks, Alf.

Both times when I found it I was looking for a large Onychiurus species, found on some logs in our garden. Even in our garden, it is very localised.

There are a lot of adult springtails of various species around now in moist, dark, organically rich habitats. Lots of myriapods too.

Harold
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Re: Monobella grassei

Quote:
Originally Posted by Harold Gough View Post
Thanks, Alf.



Both times when I found it I was looking for a large Onychiurus species, found on some logs in our garden. Even in our garden, it is very localised.



There are a lot of adult springtails of various species around now in moist, dark, organically rich habitats. Lots of myriapods too.



Harold
Yeah this is a good of time year to find springtails my suspicion is thier predators are less active

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