Invertebrate Fossils – Fossildon

Fossil Crinoid Plate

raulcreativo — Tue, 11 Jan 2022 18:00:00 +0000

Crinoids are marine animals that make up the class Crinoidea, one of the classes of the phylum Echinodermata, which also includes the starfish, brittle stars, sea urchins and sea cucumbers.Those crinoids which, in their adult form, are attached to the sea bottom by a stalk are commonly called sea lilies, while the unstalked forms are called feather stars or comatulids, being members of the largest crinoid order, Comatulida.

Adult crinoids are characterised by having the mouth located on the upper surface. This is surrounded by feeding arms, and is linked to a U-shaped gut, with the anus being located on the oral disc near the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognised, in most crinoids the five arms are subdivided into ten or more. These have feathery pinnules and are spread wide to gather planktonic particles from the water.

Fossil Trilobite

raulcreativo — Wed, 15 Dec 2021 13:28:27 +0000

Trilobites meaning (“three lobes”) are a group of extinct marine artiopodan arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 300 million years.

By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed.

Fossil Ammonites

raulcreativo — Wed, 15 Dec 2021 13:21:24 +0000

Ammonites were cepalopods and are related to modern sqiid and octopus. They had a spiral shell and were capable of moving through the water column “swimming” horizontally and and moving up or down by adjusting their boyancy. All ammonites were predators. There were many species of ammonites. They lived from the mid Paleozoic era through the entire mesozoic finally going extinct with the dinosaurs at the end of the Cretaceous Period. Madagascar produces some of the most beautiful ammonite fossils in the world with chambers filled with agate or sometimes empty and lined with crystals!

Madagascar ammonites are known for their beauty when polished. They are often cut in half and polished to show the colorful chambers and septa. These are not fossils to be put in a box or drawer. The exceptional beauty begs to be put on display.

Fossil Ammonites

raulcreativo — Wed, 15 Dec 2021 13:15:00 +0000

Fossil Trilobite

raulcreativo — Wed, 15 Dec 2021 13:08:05 +0000

By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed.

Fossil Ammonites

raulcreativo — Tue, 14 Dec 2021 23:24:17 +0000

Fossil Trilobite

raulcreativo — Tue, 14 Dec 2021 23:01:07 +0000

By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed.

Fossil Insect Plecia Pealei

raulcreativo — Tue, 14 Dec 2021 21:36:34 +0000

SPECIES: Plecia Pealei LOCATION: PERIOD: