crustacea.JPG

http://www.fossilmuseum.net/Tree_of_Life/PhylumArthropoda/Subphylum-crustacea.htmhttp://tolweb.org/Crustacea

Malacostraca tree.JPG http://en.wikipedia.org/wiki/Phylogeny_of_Malacostracahttp://tolweb.org/Malacostraca/6253

Malacostraca.

Malacostraca. Hoplocarida. (Top)Peracarida.(Bottom)

Rijk: Animalia (Dieren)

Stam: Arthropoda (Geleedpotigen) Onderstam: Crustacea (Kreeftachtigen) Klasse Malacostracahttp://nl.wikipedia.org/wiki/Malacostracahttp://en.wikipedia.org/wiki/Malacostracahttp://www.ucmp.berkeley.edu/arthropoda/crustacea/malacostraca.htmlhttp://animaldiversity.ummz.umich.edu/site/accounts/information/Malacostraca.htmlhttp://tolweb.org/Malacostraca/6253http://eol.org/pages/1157/overview

http://nl.wikipedia.org/wiki/Tienpotigen

Malacostraca

EumalacostracaEucaridaOrde Decapoda

De orde Decapoda telt 14756 recente soorten. Onderstaande indeling in onderordes, infraordes en/of superfamilies volgt De Grave et al., 2009[2].

Onderorde: Dendrobranchiata Bate, 1888

Superfamilie: Penaeoidea Rafinesque, 1815 Superfamilie: Sergestoidea Dana, 1852

Onderorde: Pleocyemata Burkenroad, 1963

Infraorde: Stenopodidea Bate, 1888 Infraorde: Caridea Dana, 1852 (garnalen) Infraorde: Astacidea Latreille, 1802 (kreeften) Infraorde: Glypheidea Winckler, 1882 Infraorde: Axiidea de Saint Laurent, 1979 Infraorde: Gebiidea de Saint Laurent, 1979 Infraorde: Achelata Scholtz & Richter, 1995 Infraorde: Polychelida Scholtz & Richter, 1995 Infraorde: Anomura MacLeay, 1838 Infraorde: Brachyura Linnaeus, 1758 (krabben)

http://dinosaurpalaeo.wordpress.com/2013/03/01/palaeontology-of-sw-germany-3-1-17-failing-to-finish-off-hauff/

(Urweltmuseum Hauff. Only a handful of specimens, but consider how rare they are )

A very rare and very beautiful fossil from the rock-hard Lias ε II5. The beast is, I guess, some 20

cm long, a model decapod.

I can’t tell if it is a complete animal or just an exuvia – the stripped-off exoskeleton and

skin of an arthropod that has moulted. I tend towards the former, as it is not labelled as an

exuvia. Genus and species unknown –

crustacean taxonomy is tough enough for the extant stuff, I guess. German wikipedia even has a

special page for just the taxonomy of the Malacostraca (lobsters, shrimps, krill, crabs, woodlice,

etc.) here.

And this is Uncina posidoniae (PalaeoDB entry; may currently be down, you can use the mirror

site). This one is an exuvia.

Here’s two more Uncina posidoniae, the most beautifully preserved one (top), and the largest

one (bottom), a 39 cm whopper. In fact, Uncina is common enough and so well known from

beautiful fossils that there is quite some literature on it.

As the photos show– a lobster, shrimp or other crustacean has a segmented body with an

exoskeleton. The various segments can separate, both on decaying animals and on exuviae. And

then you do not find perfectly preserved complete specimens, but some may have parts missing

(as does the first Uncina shown above – no carapax!), or you find the individual parts separately.

Because they have different sizes you may even get sorting by currents.

Coleia – not one carapax on its own, without the rest of the exoskeleton, but 18 of them in one slab

of maybe 40 cm square!

Remember that that Lias-Sea was most of the time a shallow sea with an anoxic bottom … No

wonder there are few crustaceans to be found in it. However, there are several layers with so-

called sea-grass on them, which in reality are crustacean burrows infilled with slightly less dark

sediment.

I have no idea what crustaceans made the burrows, but below is another very nicely preserved

one. Proeryon giganteum – this Coleiid was a bit too big to have made the Seegrasschiefer burrows, I

guess. But it looks awesome!

Below is Proeyron hartmanni, a smaller species. This specimen is shown from the back, which is a bit

unusual: Posidonia Shale fossils are normally prepared from the lower side, because it is better preserved,

having been in contact with the sediment instead of exposed to the water before burial. And Proeryons tend to

be found belly-down.

http://dinosaurpalaeo.files.wordpress.com/2013/03/hauff_107.jpg

Paleobiology http://paleodb.org/cgi-bin/bridge.pl?a=basicTaxonInfo&taxon_no=22215

Maxillopoda.

Animalia + Arthropoda + Branchiopoda Anostraca + Diplostraca + Notostraca +

branchiopoda tree.JPG http://www.sciencedirect.com/science/article/pii/S1055790305003659http://tolweb.org/Branchiopoda

http://nl.wikipedia.org/wiki/Branchiopoda

http://nl.wikipedia.org/wiki/Branchiopodahttp://en.wikipedia.org/wiki/Branchiopodahttp://www.ucmp.berkeley.edu/arthropoda/crustacea/branchiopoda.htmlhttp://animaldiversity.ummz.umich.edu/site/accounts/information/Branchiopoda.htmlhttp://tolweb.org/Branchiopodahttp://eol.org/pages/265/overview

Mesoparapylocheles michaeljacksoni.

An international team of paleontologists recently made a significant discovery in northern Spain. The group discovered on June 25, 2009 , a new family, genus and species of fossil hermit crab – one that lived 100 million years ago.The shield of the new hermit crab was discovered in an abandoned limestone quarry in the foothills of the Pyrenees in the Spanish province of Navarra.

“The rocks in the Koskobilo quarry are part of a fossil coral reef with an age of 100 million years,” Klompmaker said. “This is right in the middle of the Cretaceous period, when dinosaurs were dominating the continents.In this area in northern Spain, we find many invertebrate fossils, such as corals, algae, sea urchins, but also a wide variety of crabs.”

Mesoparapylocheles michaeljacksoni has one living relative from the same family. Parapylocheles scorpio lives in deep waters of the Indian and Pacific Oceans. “However, the new hermit crab lived in the shallow waters of a coral reef hidden in between the

branching corals,”said Dr. René Fraaije, the lead author and director of the Dutch Oertijdmuseum. “Still undiscovered species of the same family must have migrated to deeper waters at some point in time.”

Nowadays, hermit crabs predominantly use a snail shell as a shelter when the shell comes available after the death of the snail. When the extinct ammonites were still around in the Cretaceous period, they also would use their shell sometimes.

(on line ) Neues Jahrbuch für Geologie und Paläontologiehttp://www.schweizerbart.de/papers/njgpa/detail/263/76503/New_species_genera_and_a_family_of_hermit_crabs_Crustacea_Anomura_Paguroidea_from_a_mid_Cretaceous_reef_of_Navarra_northern_Spain

AbstractTwo new paguroids, Cretatrizocheles olazagutiensis n. gen., n. sp. and Mesoparapylocheles michaeljacksoni n. gen., n. sp., both based on carapaces, are described and added to the very diverse mid-Cretaceous (Albian-Cenomanian) decapod crustacean fauna of the reefal deposits near Alsasua (Navarra, northern Spain). The description of Annuntidiogenes worfi is emended on the basis of a newly discovered, much more complete carapace. Mesoparapylocheles n. gen. is a member of the Parapylochelidae n. fam., whereas Cretatrizocheles n. gen. is a member of the Trizochelinae. These species show that the linea transversalis, introduced by neontologists for a groove lateral and/or posterior to the cervical groove, is an evolved part of the branchiocardiac groove.

Keywords*paguroidea • parapylochelidae n. fam • pylochelidae • diogenidae • albian-cenomanian • cretaceous • spain