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Jens Jens is a male
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Präparation von "Was ist das" - 11 - gelöst: Tropidocoryphe Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

Hallo allerseits,

wie vorhin kurz angedeutet, hat es mich in den Fingern gekitzelt etwas anderes anzufangen. Der Dicranurus wird aber auch schon nicht zu kurz kommen, aber an dem muss man hochkonzentriert arbeiten.

Der folgende Trilo ist da zur Entspannung gedacht, wollte mal antesten wie die Trennung ist. Ergebnis gut;-)

Wir sehen hier einen Trilo, der in Marokko vorpräpariert wurde und als Halbrohling eingekauft wurde. Sowas wird gern gemacht, um den Endpräparator zu zeigen, sieh her, alles ganz , nur wenn ich weitermache, dann geht er kaputt oder sieht zumindest nicht so gut aus;-)

Die Treffer sind also nicht von mir;-)

Okay, das Rätsel ist einfach und ich erwarte, dass der erste Antwortende gleich die Lösung weiss.

lg,
Jens

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Fred
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Dechenella?
20.01.2012 21:51 Fred is offline Send an Email to Fred Homepage of Fred Search for Posts by Fred Add Fred to your Buddy List
Jens Jens is a male
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nop.

look more closely.

lg,
Jens
20.01.2012 21:57 Jens is offline Send an Email to Jens Homepage of Jens Search for Posts by Jens Add Jens to your Buddy List
Jens Jens is a male
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Fred or Mike, try it, you both know the answer;-)

The first guess was not bad, so what can it be?

Jens
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Xiphogonium Xiphogonium is a male
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Gerastos

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21.01.2012 12:41 Xiphogonium is offline Send an Email to Xiphogonium Homepage of Xiphogonium Search for Posts by Xiphogonium Add Xiphogonium to your Buddy List YIM Account Name of Xiphogonium: xiphogonium
Jens Jens is a male
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Seit wann hat Gerastos so'n komischen Grat auf seinem Cephalon und ist flach.

Menno,

lg,
Jens
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Fred
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Ok, then I'll opt for Tropidocoryphe. Glücklich5
21.01.2012 12:46 Fred is offline Send an Email to Fred Homepage of Fred Search for Posts by Fred Add Fred to your Buddy List
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Cyphaspis <g>

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Jens Jens is a male
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Hi Fred,

yes, you are right. Its naturally a Tropidocoryphe.

Also a rare and desired trilobite of Morocco;-)

And he has spines, hard to prepare.

I show you some pics I did yesterday in the evening;-)

greetings,
Jens

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Fred
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Looks like the preservation is excellent. The spines will be a challenge.
Is the trilobite enrolled?
25.01.2012 09:49 Fred is offline Send an Email to Fred Homepage of Fred Search for Posts by Fred Add Fred to your Buddy List
Jens Jens is a male
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Hi Fred,

the preparation is a challenge, more than I had expected, because the shell is extremely thin. By the way, the preservation is excellent, but the details are small and you have to work with a fine needle on the airtool.

I hope that its not enrolled, I worked yesterday on the right side on the pleurae and they going first somewhat downwards but then the thorax seems to lay in a hollow back position.

The spines will be a really hard work, because they are so fine and fragile that they are normally not prepared. Hope I find a way to preserve them;-)

In the evening I show additional pictures;-)

greetings,
Jens
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Hi,

hier mal ein Bild vom derzeitigen Präparationsstand.

Der Trilobit ist nicht gerade gross, etwas unter 2cm lang. Wie eingangs vermutet liegt die Tropi mit leichtem Hohlkreuz da, ist aber auf dem Bild nicht so recht zu sehen, müsste man mal die Seitenansicht sehen, welche aber momentan noch durch Matrix verdeckt ist.

lg,
Jens

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Es geht weiter mit der Tropi, dass ist der Zwischenstand von heute Mittag, bei normalen Tageslicht (bedeckt) aufgenommen.

Die winzigen Stacheln und generell die geringe Grösse des Trilobiten sind bei der Präparation die Herausforderung.

Ich arbeite mit einer hauchfeinen Nadel und doch lassen sich kleine Treffer nicht vermeiden.

lg,
Jens

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Still ... looks very good.
26.01.2012 21:32 Fred is offline Send an Email to Fred Homepage of Fred Search for Posts by Fred Add Fred to your Buddy List
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Hi,

I finished this trilobite yesterday evening and I'm able to present some fresh pictures now. It's a small trilobite, only 1,8cm in length, so is was hard to prepare the small spines and I decided to let them in a small ammount of limestone, to give some more stability. One spine broken away during the preparation and so I let it be in the way you can see now.

Anyway, hope you like to see the small but rare and desired trilobite.

greetings,
Jens

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Well done!
27.01.2012 14:01 Fred is offline Send an Email to Fred Homepage of Fred Search for Posts by Fred Add Fred to your Buddy List
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tanks;-)

I like that small bug, it's my first Tropi;-)

greetings,
Jens
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Remarkable result! Glücklich5

I am quite intrigued by seeing the structure of the cephalon in such detail.
This ridge on the border of the genal area and preglabellar field as well as the difference in patterns between the two separated area's somehow distantly remind of the brims on Harpetida. Quite an exciting trilobite.
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Jens Jens is a male
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Hi Mark,

thanks;-)

I see also some similarities to cambrian trilobites, e.g. Olenus and relatives. Also very thin shelled and with this veiny delicate structures is another feature all this groups share together. Such veiny structures are called genal caeca and are interpreted as a respiratory system analogous to modern arthropods:

http://www.tandfonline.com/doi/abs/10.1080/03115517808527783

We find this structures normally in thin shelled trilobites, with different systematic relationships;-) So this structures are probably present (but not visible) in all trilobites and only the thin shelled trilobites present them us in the way we know;-)
If I have to guess, its sounds that the respiration system works trough the shell or its especially well developed as a adaption for probably environments with a poor content of oxygen. Hold in mind, that we have the theory of chemosymbiosis of Olenids together with bacterias.

greetings,
Jens
27.01.2012 15:52 Jens is offline Send an Email to Jens Homepage of Jens Search for Posts by Jens Add Jens to your Buddy List
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