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Adelophthalmoidea
Adelophthalmidae (the name deriving from the type genus ''Adelophthalmus'', meaning "no obvious Compound eyes, eyes") is a Family (biology), family of eurypterids, an extinct group of aquatic arthropods. Adelophthalmidae is the only family classified as part of the superfamily Adelophthalmoidea, which in turn is classified within the infraorder Diploperculata in the suborder Eurypterina. Adelophthalmid eurypterids were small and Nekton, swimming eurypterids that appeared in the Silurian Geological period, period. With the earliest known members of the group, ''Nanahughmilleria, Nanahughmilleria prominens'' and ''Parahughmilleria, Parahughmilleria maria'', being known from deposits of Early Silurian (possibly the Llandovery epoch, Llandovery Epoch (geology), epoch) age and the last members, belonging to the long-lasting and widespread genus ''Adelophthalmus'', going extinct in the Cisuralian, Early Permian, the Adelophthalmidae is the longest lasting single family of eurypterids. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurypterina
Eurypterina is one of two suborders of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions". Eurypterine eurypterids are sometimes informally known as "swimming eurypterids". They are known from fossil deposits worldwide, though primarily in North America and Europe. Seventy-five percent of eurypterid species are eurypterines; this represents 99% of specimens. The superfamily Pterygotioidea is the most species-rich clade, with 56 species, followed by the Adelophthalmoidea with 43 species; as sister taxa, they comprise the most derived eurypterines. Pterygotioidea includes the pterygotids, which are the only eurypterids known to have a cosmopolitan distribution. Though more numerous both in specimens and taxa, the eurypterines have the shorter temporal range of the two eurypterid suborders. They first appeared around the same time as the Stylonurina in the Middle Ordovician. The suborder faced a slow extinction during the Middle and Lat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
