The genus Trigoides is known from fossils from the
Chengjiang Lagerstätte
The Maotianshan Shales () are a series of Early Cambrian sedimentary deposits in the Chiungchussu Formation or Heilinpu Formation, famous for their '' Konservat Lagerstätten'', deposits known for the exceptional preservation of fossilized organ ...
. It is proposed to be a type of
ctenophore
Ctenophora (; : ctenophore ) is a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and they ar ...
.
[Hu, Steiner, Zhu, Erdtmann, Luo, Chen, Weber (2007). "Diverse pelagic predators from the Chengjiang Lagerstätte and the establishment of modern-style pelagic ecosystems in the early Cambrian." ''Palaeogeography, Palaeoclimatology, Palaeoecology'', 254(1-2): 307-316] A phylogenetic study of
Cambrian
The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordov ...
stem-group ctenophores recovered ''Trigoides'' in
Scleroctenophora
Scleroctenophora is an extinct class of stem group ctenophores, known from the Chinese Maotianshan shales of Yunnan. It is dated to Cambrian Stage 3 and belongs to late Early Cambrian
The Cambrian ( ) is the first geological period of the ...
, along with''
Galeactena'', ''
Maotianoascus'', ''
Thaumactena'', ''
Batofasciculus'' and ''
Gemmactena
''Gemmactena'' is an extinct genus of scleroctenophoran that lived during Cambrian Stage 3.
Distribution
''Gemmactena actinala'' is known from the Heilinpu Formation of China
China, officially the People's Republic of China (PRC), i ...
''.
References
Monotypic prehistoric ctenophore genera
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