Ethusa chibai Karasawa, 1993

Ethusa chibai Karasawa, 1993: 44, fig. 4, pl. 8, fig. 12; 1999: fig. 6. — Karasawa & Kato 2001: Database. — Schweitzer et al. 2010: 80; 2021: 3. — Sasaki 2019: 7812. — Van Bakel et al. 2020: fig. 10.21.

REMARKS

In this crab from the Lower Pliocene of southwestern Japan, the “inflated branchial region”, the two epibranchial lobes “divided into two by a shallow, oblique groove”, which are not very visible in the figure, are somewhat reminiscent of the ridged branchial region of Ethusa popognensis (see below). According to De Angeli et al. (2009: 176), E. chibai can be distinguished from E. popognensis by “a carapace longer, dorsal surface smoother, and shallow branchiocardiac groove”.