Rhomboentomozoe Přibyl, 1951

Legiot, Nicolas, 2019, Silurian myodocope ostracods from Poland, Acta Palaeontologica Polonica 64 (2), pp. 379-397 : 388-389

Genus Rhomboentomozoe Přibyl, 1951

Type species: Rhomboentomozoe rhomboidea ( Barrande, 1872) , designated by Přibyl (1951: 111). Upper Silurian of Kozel near Beroun, Bohemia, Czech Republic.

Species included: Type species and possibly Rhomboentomozoe ? sp. of Wang 2009.

Emended diagnosis.—Same as species.

Remarks.— Přibyl (1951: 115) assigned Isochilina armata pygmaea Ruedemann, 1901 , from the Upper Ordovician Mohawkian of New York State, USA, to Rhomboentomozoe . Following Přibyl’s (1951) opinion, the Treatise on Invertebrate Paleontology ( Sylvester-Bradley 1961: Q390) lists one “myodocopid” genus from the Ordovician, namely Rhomboentomozoe Přibyl, 1951 . This supposed Ordovician record of Rhomboentomozoe is not accepted herein. Isochilina armata pygmaea is clearly very different from the Bohemian Silurian type-species of Rhomboentomozoe , namely Cryptocaris rhomboidea Barrande, 1872 . The specimen from China of Rhomboentomozoe ? sp. of Wang 2009 (15: pl. 1: 9) is incomplete and cannot be assigned to Rhomboentomozoe with certainty. If it is a Rhomboentomozoe species it would extend the range of the genus into the Lower Devonian (Pragian).

Siveter and Vannier (1990) considered that the genus Rhomboentomozoe is, “at best, a very atypical myodocope and most likely belongs to another group”. However, evidence from new material (e.g., muscle scar, rostrum) indicates its myodocope affinities. The species from Sardinia described by Canavari (1900: 201, pl. 26: 3–5) as Entomozoe preriodes shows marked resemblance to R. rhomboidea .

Stratigraphic and geographic range.—Ludlow Series, Silurian of the Czech Republic ( Barrande 1872) and Poland,

and possibly Sardinia ( Canavari 1900). Also possibly Pragian, Lower Devonian of China ( Wang 2009).