Heterastridium

Heterastridium
Some Karakorum stones (labelled as Stoliczkaria and Syringosphaera)
Scientific classification
Kingdom: Animalia
Subkingdom: Eumetazoa
Phylum: Cnidaria
Subphylum: Medusozoa
Genus: Heterastridium

Heterastridium is a genus of fossil marine Hydrozoan from the Upper Triassic. They are mostly discoid or spherical and some forms found in the Karakorum mountains are called Karakorum stones.[1] They vary in diameter from 1 to 35 cm and appear to follow Cope's rule for the prehistoric climate.

References

  1. Erik Flügel (1960) Heterastridium conglobatum conglobatum Reuss, an Upper Triassic Hydrozoan from the Petra-Tou-Roumiou Limestone of Pendakomo, Cyprus. Journal of Paleontology 34(1):127-132
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