Pachydiadema
| Pachydiadema Temporal range:
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|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Thecostraca |
| Subclass: | Cirripedia |
| Order: | Balanomorpha |
| Superfamily: | †Pachydiadematoidea Chan et al., 2021 |
| Family: | †Pachydiadematidae Chan et al., 2021 |
| Genus: | †Pachydiadema Withers, 1935 |
| Species: | †P. cretaceum
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| Binomial name | |
| †Pachydiadema cretaceum Withers, 1935
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| Synonyms | |
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Pachydiadema is an extinct genus of acorn barnacles in the order Balanomorpha that lived in what is now Sweden during the early Campanian. The genus is monospecific, containing a single species, Pachydiadema cretaceum.
It is the only genus in the family Pachydiadematidae and superfamily Pachydiadematoidea, both of which are monotypic. It was originally described as a subgenus of Catophragmus, but was redescribed as a separate genus in 2014.