Proarticulata

Proarticulata is a proposed extinct phylum of very early bilateral animals known from fossils found in the Ediacaran (Vendian) fauna. Mikhail A. Fedonkin describes animals in Proarticulata as having a "shield-like" shape, an unmineralized, thin, flexible carapace and a thick, segmented body. The segmentation is described as a "symmetry of gliding reflection", in which the correspoding segments on the left and right sides do not line up, but are staggered. Fedonkin suggests that Proarticulata may be ancestral to the chordates. Fedonkin places the genera Dickinsonia, Yorgia, Vendia, Archaeaspinus, Andiva and Ovatoscutum in Proarticulata.^[2] A. Yu. Ivantsov has proposed that the genera Tamga, Lossinia, Ivovicia and Onega are in or close to Proarticulata.^[3]

Contents 1 List of Proarticulata 1.1 Body fossils 1.2 Trace fossils 2 See also 3 References 4 External links

List of Proarticulata

Body fossils

• Armillifera Fedonkin, 1980

A. parva Fedonkin, 1980

• Andiva Fedonkin, 2002

A. ivantsovi Fedonkin, 2002

• Archaeaspinus Ivantsov, 2007 (=Archaeaspis Ivantsov, 2001)

A. fedonkini Ivantsov, 2001

• Chondroplon Wade, 1971 (possible =Dickinsonia)

C. bilobatum Wade, 1971

• Cyanorus Ivantsov, 2004

C. singularis Ivantsov, 2004

• Dickinsonia Sprigg, 1947

D. costata Sprigg, 1947

D. lissa Wade, 1972

D. menneri Keller 1976 (=Vendomia menneri Keller 1976)

D. tenuis Glaessner et Wade, 1966

• Ivovicia Ivantsov, 2007

I. rugulosa Ivantsov, 2007

• Karakhtia Ivantsov, 2004

K. nessovi Ivantsov, 2004

• Lossinia Ivantsov, 2007

L. lissetskii Ivantsov, 2007

• Marywadea Glaessner, 1976

M. ovata Glaessner et Wade, 1966

• Onega Fedonkin, 1976

O. stepanovi Fedonkin, 1976

• Ovatoscutum Glaessner et Wade, 1966

O. concentricum Glaessner et Wade, 1966

• Paravendia Ivantsov, 2004

P. janae Ivantsov, 2001 (=Vendia janae Ivantsov, 2001)

• Phyllozoon Jenkins et Gehling, 1978

P. hanseni Jenkins et Gehling, 1978

• Podolimirus Fedonkin, 1983

P. mirus Fedonkin, 1983

• Praecambridium Glaessner et Wade, 1966

P. siggilum Glaessner et Wade, 1966

• Spriggina Glaessner, 1958

S. floundersi Glaessner, 1958

• Tamga Ivantsov, 2007

T. hamulifera Ivantsov, 2007

• Valdainia Fedonkin, 1983

V. plumosa Fedonkin, 1983

• Vendia Keller, 1969

V. sokolovi Keller, 1969

V. rachiata Ivantsov, 2004

• Yorgia Ivantsov, 1999

Y. waggoneri Ivantsov, 1999

Trace fossils

• Epibaion Ivantsov, 2002

E. axiferus Ivantsov, 2002.

E. waggoneris Ivantsov, 2011. This is a trace of Yorgia waggoneri

E. costatus Ivantsov, 2011. This is a trace of Dickinsonia costata

See also

List of Ediacaran genera

References

1. ^ Mikhail A. Fedonkin, James G. Gehling, Kathleen Grey, Guy M. Narbonne, and Patricia Vickers-Rich foreword by Arthur C. Clarke. (2008) "The Rise of Animals. Evolution and Diversification of the Kingdom Animalia"
2. ^ Fedonkin, Mikhail A. 2003. "The origin of the Metazoa in the light of the Proterozoic fossil record". Paleontological Research, vol. 7, no. 1, March 31, 2003. P.35. Retrieved from [1] May 19, 2007
3. ^ Ivantsov, A. Yu. 2007. "Small Vendian transversely Articulated fossils". Paleontological Journal. Volume 41, Number 2. April, 2007. Abstract retrieved from [2] May 19, 2007

External links

• Database of Ediacaran Biota Advent of Complex Life