Taxonomic remarks on Brazilian Cretaceous Decapoda from Araripe Basin, Brazil, and ecological inferences

Abstract

Beurlenia araripensis Martins-Neto and Mezzalira, 1991 (Decapoda: Caridea) and Paleomattea deliciosa Maisey and Carvalho, 1995 (Decapoda: Penaeoidea) are reviser baseated upon new and better preserved samples. The new specimens were found in the Santana Formation, Araripe Basin, Northeast Brazil, respectively in the Crato and Romualdo members. B. araripensis is represented by a well preserved specimen, where is possible to see a cephalothorax with antennal and branchiostegal spines, rostrum with 14 dorsal spines, and telson with posterior spines. This material permits a better characterization of the species' morphology and its placement in Palaemonidae. The Dendrobranchiata material of P. deliciosa, found in the bituminous shale of Romualdo Member, is for the fi rst time recorded in clusters of fragmentary parts that suggest mass mortality and morphologies that point to a planktonic lifestyle, as occurs with extant forms of sergestids.

The first amber caridean shrimp from Mexico reveals the ancient adaptation of the Palaemon to the mangrove estuary environment

“…aestuarius sp. nov. with antennal spine and 14 teeth on dorsal rostrum 26 . Schmelingia Schweigert, 2002 has a single species preserved in Upper Jurassic of Germany, which is different from the P .…”

New data on Beurlenia araripensis Martins-Neto & Mezzalira, 1991, a lacustrine shrimp from Crato Formation, and its morphological variations based on the shape and the number of rostral spines

“…Accordingly, Martins-Neto et al [4] could not clearly observe the number of rostral spines in B. araripensis, but Maisey et al [5] recognized 12 small supra-rostral spines in a single analyzed specimen with complete rostrum. Decades later, 14 supra-rostral spines and three sub-rostral spines were recognized [7]. This number of rostral spines is essential for the identification of caridean species [19], and this variation probably reveal morphologic plasticity [7] as occurs, for example, in living species of Macrobrachium Bate, 1868 [20,21] and Palaemon Weber, 1795 [22], within Palaemonidae Rafinesque, 1815.…”

A remarkable new genus and species of the planktonic shrimp family Luciferidae (Crustacea, Decapoda) from the Cretaceous (Aptian/Albian) of the Araripe Sedimentary Basin, Brazil

“…The Araripe sedimentary basin in the northern region of Brazil has an exceptionally well-preserved fossil record of several groups, including insects, plants, fishes, and several tetrapod groups (e.g., Maisey, 1991; Lima et al, 2012; Bantim et al, 2015; Oliveira and Kellner, 2017). Ongoing studies have revealed an increasing number of crustacean species—mostly shrimps—in this basin (Martins-Neto and Mezzalira, 1991; Maisey and Carvalho, 1995; Saraiva et al, 2009; Santana et al, 2013; Pinheiro et al, 2014). Until now, two malacostracan planktonic species have been found in this basin: a zoea (Maisey and Carvalho, 1995) and the sergestid Paleomattea deliciosa Maisey and Carvalho, 1995 (Saraiva et al, 2009; Luque, 2015).…”

“…Ongoing studies have revealed an increasing number of crustacean species—mostly shrimps—in this basin (Martins-Neto and Mezzalira, 1991; Maisey and Carvalho, 1995; Saraiva et al, 2009; Santana et al, 2013; Pinheiro et al, 2014). Until now, two malacostracan planktonic species have been found in this basin: a zoea (Maisey and Carvalho, 1995) and the sergestid Paleomattea deliciosa Maisey and Carvalho, 1995 (Saraiva et al, 2009; Luque, 2015).…”