Abstract
The aquatic and semiaquatic invertebrates in fossiliferous amber have been reported, including taxa in a wide range of the subphylum Crustacea of Arthropoda. However, no caridean shrimp has been discovered so far in the world. The shrimp Palaemon aestuarius sp. nov. (Palaemonidae) preserved in amber from Chiapas, Mexico during Early Miocene (ca. 22.8 Ma) represents the first and the oldest amber caridean species. This finding suggests that the genus Palaemon has occupied Mexico at least since Early Miocene. In addition, the coexistence of the shrimp, a beetle larva, and a piece of residual leaf in the same amber supports the previous explanations for the Mexican amber depositional environment, in the tide-influenced mangrove estuary region.
Highlights
The aquatic and semiaquatic invertebrates in fossiliferous amber have been reported, including taxa in a wide range of the subphylum Crustacea of Arthropoda
Numerous aquatic and semi-aquatic groups of amber inclusions have been reported in Mexican amber, such as Copepoda, Ostracoda, Tanaidacea, Amphipoda, Isopoda and Brachyura, there are still more species groups to be discovered and studied[14]
Alburnia Bravi & Garassino, 1998 possesses only one species found in Lower Cretaceous of Italy, which is significantly different from the P. aestuarius sp. nov. with ten teeth www.nature.com/scientificreports on dorsal rostrum, no traces of branchiostegal groove and branchiostegal spine[25]
Summary
The aquatic and semiaquatic invertebrates in fossiliferous amber have been reported, including taxa in a wide range of the subphylum Crustacea of Arthropoda. (Palaemonidae) preserved in amber from Chiapas, Mexico during Early Miocene 22.8 Ma) represents the first and the oldest amber caridean species This finding suggests that the genus Palaemon has occupied Mexico at least since Early Miocene. The shrimp in this study represents the first and oldest definite record of the Caridea species preserved in amber all over the world. It enriches the inclusions biodiversity of Mexican amber, and suggests the distribution of Palaemon in southeastern Mexico before Early Miocene. The coexistence of the amber inclusions, www.nature.com/scientificreports/
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