Eryma nippon, Karasawa & Ohara & Kato, 2023

Karasawa, Hiroaki, Ohara, Masaaki & Kato, Hisayoshi, 2023, Validation of the names of four species of Decapoda and one species of Isopoda from the Lower Cretaceous (Barremian) Arida Formation of central Japan, Zootaxa 5277 (1), pp. 198-200 : 198

Eryma nippon n. sp.

Eryma nippon Karasawa, Ohara & Kato, 2008: 102–104 , figs. 2.6–2.9. [unavailable].

Type material. HOLOTYPE: WMNH-Ge-1140320056, carapace and right pereiopod 1 from Suhara, Yuasa-cho , Wakayama Prefecture (34°2′35.6′′N; 135°10′29.4′′E).

Diagnosis. Moderate-sized Eryma . Rostrum short with rimmed lateral margins. Gastro-orbital groove weakly developed. Cervical groove deep, sinuous, extending ventrally to join deep antennal groove. Prominence omega and chi well defined. Hepatic groove deep, joining cervical and branchiocardiac grooves. Postcervical groove deep, but hallow dorsally, joining branchiocardiac groove. Inferior groove shallow. Carapace with scabrous ornamentation. Region between cervical and postcervical grooves coarsely scabrous. Intercalated plate narrow, longitudinally ridged; median suture following posterior end of intercalated plate, extending to posterior margin. Gastric region coarsely tuberculate; subdorsal carinae coarsely tuberculate.

Etymology. From its occurrence in Nippon; used as a noun in appoistion.