Fossil range: Early Cambrian
Microdictyon is an extinct "armored worm" coated with dot-like scleritic scales, known from the Early Cambrian Maotianshan shale of Yunnan China. A worm is a common name given to a diverse group of invertebrate animals that have a long soft body and no legs A sclerite ( Greek skleros meaning " hard " is a hardened body part The Cambrian is a geologic period and system that began about Ma (million years ago at the end of the Proterozoic eon and ended about Ma with In the Maotianshan shales is a lower Cambrian Konservat Lagerstätte named for Maotianshan Hill ( in Chengjiang County Yunnan Province Microdictyon is sometimes included in a somewhat ill-defined Phylum – Lobopodia – that includes several other odd worm-like and segmented free-swimming animals that do not appear to be arthropods or worms. A phylum ( Plural: phyla) is a Taxonomic rank between Kingdom and above Class. Lobopodia is a group of poorly understood animals which mostly fall as a Stem group of Arthropods. The phylum includes Microdictyon, Onychodictyon, Cardiodictyon, Luolishania, Paucipodia, as well as the Anomalocarids. Anomalocaris ("Anomalous shrimp" is an extinct genus of Anomalocarids which are in turn thought to be closely related to the Arthropods The The isolated sclerites of Microdictyon are known from other Lower Cambrian deposits. The Cambrian is a geologic period and system that began about Ma (million years ago at the end of the Proterozoic eon and ended about Ma with (The famous Hallucigenia from the Cambrian-age Burgess Shales was once considered to belong to the family Lobopodia, but is now recognized as an Onychophoran, a relative of the velvet worms. Hallucigenia is an Extinct Genus of Animal found as fossils in the Middle Cambrian -aged Burgess Shale formation of Lobopodia is a group of poorly understood animals which mostly fall as a Stem group of Arthropods. The velvet worms ( Onychophora — literally "claw bearers" form a Clade within the Ecdysozoa and can be simply described as " Worms The velvet worms ( Onychophora — literally "claw bearers" form a Clade within the Ecdysozoa and can be simply described as " Worms )
Microdictyon sinicum (Chen, Hou and Lu, 1989) is typical. The wormlike animal has ten pairs of sclerites on the sides, matched to a pair of tentacle-like feet below. A sclerite ( Greek skleros meaning " hard " is a hardened body part Tentacles can refer to the elongated flexible organs that are present in some animals especially Invertebrates and sometimes to the hairs of the leaves of some insectivorous The foot is an Anatomical structure found in many Animals It is the terminal portion of a limb which bears weight and allows Locomotion. The head and posterior are tubular and featureless. In Anatomy, the head of an Animal is the Rostral part (from Anatomical position that usually comprises the Brain, Eyes A picture can be found at http://paws.wcu.edu/dperlmutr/earlyfauna.html.
The name Microdictyon is also used for a genus of green algae. Algae ( sing. alga are a large and diverse group of simple typically Autotrophic organisms ranging from Unicellular to Multicellular forms