Subgenus (Megastraea) J. H. McLean, 1970

(5-4-1-3-2-12-2-2-9-0-0-0-0)
Ref. Abbott, 1974 p 60
Keen, 1971 p 353
Vaught, 1989 p 11

olivacea (W. Wood, 1828)
(5-4-1-3-2-12-2-2-9-1-0-0-0)
Syn. Trochus (Trochus) erythropthalmus R. A. Philippi, 1848;
Trochus (Trochus) melchersi K. T. Menke, 1851
Ref. Abbott, 1974 p 60

turbanica (W. H. Dall, 1910)
(5-4-1-3-2-12-2-2-9-2-0-0-0)
Rockpile Turban, Turban Star-shell
Ref. Kaicher, 1988 #5359 bw
Syn. Astraea (Astraea) petrothauma S. S. Berry, 1940;
Astraea (Astraea) rupicollina R. Stohler, 1959
Ref. Abbott, 1974 p 60 d
Keen, 1971 p 355 bw
Syn. Astraea (Astraea) rupicollina R. Stohler, 1959
Ref. Abbott & Dance, 1982 p 50 c

undosa [undosus] (W. Wood, 1828) [T]
(5-4-1-3-2-12-2-2-9-3-0-0-0)
Wavy Turban
Ref. Abbott, 1974 p 60 bw
Abbott & Dance, 1982 p 50 c
Keen, 1971 p 353