Early Cretaceous spinicaudatans (“conchostracans”) from lacustrine strata of the Sidi Aïch Formation in the northern Chotts range, southern Tunisia: Taxonomy, biostratigraphy and stratigraphic implication

New Early Cretaceous shrimp (Decapoda) from the Sidi Aïch Formation of the Northern Chotts Range, southern Tunisia: Taxonomy, biostratigraphy, and palaeoenvironmental implications

“…The fossil shrimp genus Macropenaeus, previously recovered in the Late Cretaceous (Cenomanian) limestones of Hadjoula, northwest Lebanon, has been interpreted as having inhabited shallow marine setting in small shallow basins corresponding to intra-shelf palaeoenvironment (Audo and Charbonnier, 2013). However, in our study, fossil shrimp are preserved with fish, freshwater clam shrimp, and plants (Boukhalfa et al, 2015). The mixing of freshwater and marine fauna could be the result of fluctuating shorelines (Tasch and Zimmerman, 1961) or by the dispersal of clam shrimp eggs to coastal areas by the widespread sheet of water that drained toward the sea (Lana and Carvalho, 2002).…”

“…The Cretaceous rocks in the ZBAS (Fig. 1C) have been studied by numerous authors (Abdeljaouad and Zargouni, 1981;Abbès and Zargouni, 1986;Ben Youssef and Peybernes, 1986;M'Rabet, 1987;Abbès and Tlig, 1991;Louhaïchi and Tlig, 1993;Chaâbani and Razgallah, 2006;Gallala, 2009;Ouaja et al, 2011;Aloui et al, 2012;Gharbi et al, 2013;Boukhalfa et al, 2015;Li et al, 2017). The Cretaceous stratigraphic chart ( Fig.…”

“…The Sidi Aïch Formation has been assigned a late Barremian age in the study area based on presence of the conchostracan, Cratostracus? tunisiaensis Boukhalfa, Li, Ben Ali, and Soussi, 2015, described from the Northern Chotts Range at the Zimlet El-Beidha Anticline Structure. The age of C.?…”

“…3B, C, and D) exposes a 20 m, thick light to dark green laminated claystone interval that yields an important biota composed of shrimp, fish, clam shrimp, and plants ( Fig. 3D) (Boukhalfa et al, 2015). This paper focuses on the taxonomy, biostratigraphy, and palaeoenvironmental significance of the shrimp fauna.…”

The morphology and systematics of the clam shrimp Platyestheria gen. nov. abaetensis (Cardoso) (Crustacea, Spinicaudata) from the Lower Cretaceous of the Sanfranciscana Basin, southeast Brazil

“…4, 5A and B). These are different from the wavy, rounded to subtriangular shaped beads seen in assorted families of spinicaudatans, including, for instance, the antronestheriid Martinsestheria; the polygraptid Dendrostracus lagarcitoensis Pr amparo, Ballent, Gallego and Milana, 2005; the afrograptid Surreyestheria Liao, Gallego, Shen, Jarzembowski and Huang, 2017; the fushunograptids Qinghaiestheria Wang, 1983 and some putative species of Cratostracus Huang (in Chen and Shen, 1977), Orthestheria Chen (in Zhang et al, 1976) and Ordosestheria Wang, 1984(Li, 2004Shen et al, 2004;Pr amparo et al, 2005;Gallego et al, 2013;Boukhalfa et al, 2015;Li, 2017;Liao et al, 2017). One specimen of Cratostracus?…”