The genus Trigoides is known from fossils from the
Chengjiang Lagerstätte. It is proposed to be a type of
ctenophore
Ctenophora (; ctenophore ; ) comprise 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 ...
.
[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 Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ag ...
stem-group ctenophores recovered ''Trigoides'' in
Scleroctenophora, along with''
Galeactena'', ''
Maotianoascus'', ''
Thaumactena'', ''
Batofasciculus'' and ''
Gemmactena''.
References
Monotypic prehistoric ctenophore genera
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