‘Rugalucina’ cracentis sp. nov. A–E Lucina concinna Holotype (ZMC I.100470) Gulf of Suez, exterior and interior of right and left valves and dorsal view, L 9.2 mm F–H ‘Rugalucina cracentis’ exterior of right valve and interior of right and left valves Egypt, Dahab, Gulf of Aqaba, Red Sea. H. Blatterer colln, L 6.7 mm I, J R. cracentis exterior and interior of right valve Dahab, Gulf of Aqaba, Red Sea, H. Blatterer colln, L 8.5 mm K, L R cracentis exterior and interior of left valve Egypt, 4 km north of Port Safaga, H. Dekker colln 6930, L 8.3 mm M interior of right valve, L 8.8 mm N, O exterior and interior left valve Egypt, 4 km north of Port Safaga, H. Dekker colln 6930, L 7.1 mm P, Q interiors of right and left valves, H. Dekker colln 6930, L 8.7 mm R, S hinge details of P and Q.