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Go to the bottom of this page Famille des Homalonotidae (Chapman, 1890)
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Crozo Crozo is a male
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Daumen hoch! Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

Classification : Phacopida - Calymenina Calymenoidea
Représentant type de cette famille : Homalonotus (König, 1825)

Diagnose générale de cette famille :
Céphalon : de forme arrondi (homalonotus) à triangulaire (Trimerus ou dipleura)
Absence quasi-permanente de la bordure céphalique.
Glabelle se rétrécissant antérieurement souvent de forme rectangulaire et comportant
quatre sillons glabellaires latéraux, très peu profond et souvent effacés.
Aire palpébral de petite taille, librigènes assez large (chez les homalonotus),
à assez fin (chez les Trimerus). Angles génaux en général arrondis.
Chez certaines espèces (comme chez Burmeisterella vixarmata du dévonien allemand,
on notera La présence de nombreuses pointes assez longues sur toute la surface du trilobite).
Sutures faciales de type Gonatoparian
Surface visuelle très petites et on notera aussi la présence d’une crête oculaire peu marqué
chez les formes primitives (comme chez les Eohomalonotus).
Thorax : composé de 13 segments avec un rachis modérément large chez les formes primitives et
indistinct et très large chez les formes suivantes. La division du thorax n’est pas vraiment bien marquée
chez tous les représentants De cette famille, voir même presque absente chez certaines espèces (comme chez Burmeisterella)
Terminaisons pleurales émoussées et de formes arrondies.
Pygidium : semi-circulaire (chez les eohomalonotus) ou triangulaire (chez les Trimerus)
La segmentation du pygidium est assez variable chez leurs espèces, pouvant passer d’une
Segmentation très marquée (chez les trimerus) à quasi-absente (chez les Iberocoryphe).
Pouvant se terminer par une relativement courte pointe (comme chez Burmeisterella vixarmata).

Répartition : de l’Ordovicien inférieur au Dévonien moyen.

Ma collection de Homalonotidae :

Crozo has attached these images (downsized versions):
097-parahomalonotus.jpg 129-plaesiacomia.jpg 183-brongniartella.jpg 016a-kerfornella.jpg

This post has been edited 2 time(s), it was last edited by Crozo: 14.03.2012 13:45.

09.03.2012 08:51 Crozo is offline Send an Email to Crozo Search for Posts by Crozo Add Crozo to your Buddy List
Crozo Crozo is a male
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Thread Starter Thread Started by Crozo
Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

suite,

Crozo has attached these images (downsized versions):
203-plaesiacomia.jpg 204-Kerfornella.jpg 230-eohomalonotus.jpg 251-plaesiacomia.jpg 255-eohomalonotus.jpg

09.03.2012 08:52 Crozo is offline Send an Email to Crozo Search for Posts by Crozo Add Crozo to your Buddy List
Crozo Crozo is a male
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Thread Starter Thread Started by Crozo
RE: Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

suite,

Crozo has attached these images (downsized versions):
256-eohomalonotus.jpg 257-eohomalonotus.jpg 312-Kerfornella.jpg 319-iberocoryphe.jpg 350-Dipleura.jpg

09.03.2012 08:55 Crozo is offline Send an Email to Crozo Search for Posts by Crozo Add Crozo to your Buddy List
Xiphogonium Xiphogonium is a male
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RE: Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

If my recollection is correct, then the Parahomalonotus from Morocco has been reassigned to the new genus Wenndorfia, but I am lacking the paper, I think. I have to ask Harald unless someone else here knows the source ....

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13.03.2012 19:30 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
juniper juniper is a male
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RE: Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

The paper would be helpful of course, but I thought they didn't revise "Parahomalonotus" s.l. but only the ones from the Hunsrück Slate.

Ich dachte, zu "Wenndorfia" wurden nur die Vertreter von Parahomalonotus aus dem Hunsrückschiefer revidiert ?

lg.Klaus

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13.03.2012 19:44 juniper is offline Search for Posts by juniper Add juniper to your Buddy List
Xiphogonium Xiphogonium is a male
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RE: Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

Na, mittlerweile auch jede Menge in Australien und anderswo. Muß mal mit Harald reden, der weiß das wahrscheinlich aus dem Kopf heraus. Er hat selbst sein Stück auf der Webseite auch noch als P. stehen.

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13.03.2012 19:49 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
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RE: Famille des Homalonotidae (Chapman, 1890) Reply to this Post Post Reply with Quote Edit/Delete Posts Report Post to a Moderator       Go to the top of this page

Aaaaalso...... alles Wenndorfia, laut Harald. Hat den Autor gerade auch nicht im Kopf, ist sich aber absolut sicher. Ich weiß zufällig auch daß in Australien jede Menge Homanoloten zu Wenndorfia gestellt wurden, ist also nicht auf die Hunsrück-Taxa beschränkt.

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13.03.2012 20:38 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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Hallo,

auch von den Homalonotidae gibt es nun eine Übersicht zur Phylogenie, die uns Crozo zur Verfügung gestellt hat.

also for the Homalonotidae we have now a new phylogenetic family tree, provided us exclusive by Crozo.

Many thanks;-)

Und wo wir schonmal dabei sind, hier ein paar pdf's zur Thematik:
And to celebrate that, here I give you links for 2 important references.

Sandford (2005): Homalonotid trilobites from the Silurian and Lower Devonian of south-eastern Australia and New Zealand (Arthropoda: Trilobita: Homalonotidae).

http://museumvictoria.com.au/pages/3925/62_sandford.pdf

hierin wird die Gattung Wenndorfia Sandford, 2005 aufgestellt.

Sandford discuss the phylogeny of the family and described the new genus Wenndorfia.

Wenndorfia: Type species. Homalonotus mutabilis Koch, 1880 from the Lower Devonian (upper Emsian) of Germany.

In der systematischen Übersicht von Sandford wird dann auch Parahomalontus planus zu Wenndorfia gestellt und die Gattung Parahomalonotus auf wenige Arten, die der Typusart (*Homalonotus gervillei de Verneuil, 1850) nahestehen, begrenzt.

By the way, in his systematic overview Sandford choose some species of Parahomalonotus now belonging to Wenndorfia, includiing Parahomalonotus planus. The genus Parahomalotus is now restricted to some species close to the type species of Parahomalonotus (= *Homalonotus gervillei de Verneuil, 1850).

SIMÕES et al. (2009): SYSTEMATICS, TAPHONOMY, AND PALEOECOLOGY OF HOMALONOTID TRILOBITES (PHACOPIDA) FROM THE PONTA GROSSA FORMATION (DEVONIAN), PARANÁ BASIN, BRAZIL.

http://www.sbpbrasil.org/revista/edicoes/12_1/simoes.pdf

regards & lg,
Jens

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Phylo-Homalonotidae-2-opt.jpg

18.09.2012 11:07 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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