Petrarca rubus sp. nov., paratype, antennules, SEM. A, left antennule, segments numbered. B, rudimentary seta on fourth antennular segment. C, tiny pores (circled) on lateral surface of terminal (fifth) antennular segment. D, double pores on lateral surface of terminal (fifth) antennular segment. E, rudimentary setae (indicated by arrowheads) at base of claw, fifth antennular segment. F, aesthetasc on claw guard (rudimentary seta at base of aesthetasc indicated by arrowhead). G, rudimentary subterminal seta (indicated by arrowhead) of aesthetasc of claw guard. H, rudimentary terminal setae of claw guard (indicated by arrowheads). I, wrinkled cuticle with tiny pores on postaxial (ventral) margin of fifth antennular segment. Abbreviations: ae, aesthetasc; cl, claw; clg, claw guard. Scale bars in µm.