Mimachlamys, Iredale, 1929

Dijkstra, Henk H. & Beu, Alan G., 2018, Living Scallops of Australia and Adjacent Waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae), Records of the Australian Museum (Rec. Aust. Mus.) 70 (2), pp. 113-330 : 275-276

Key to species of Mimachlamys from Australia

1 Shell c. 30 mm high, elongate, weakly inflated, almost equally convex, valves with c. 30 evenly spaced, narrow, raised, serrated radial plicae, byssal notch deep, byssal fasciole broad ........................................ M. albolineata

—— Shell with 24–30 prominent squamous radial plicae ................................................................. 2

2 Shell c. 100 mm high, subcircular, rather thin to solid, almost equally convex, valves with 24–30 evenly spaced, prominent squamous radial plicae, flanked by subdivided secondary riblets, tertiary riblets in interspaces, byssal notch deep, byssal fasciole broad .................................................................................... M. asperrima

—— Shell with 16–18 narrowly rounded lamellate primary radial plicae ......................................................................................................................................... 3

3 Shell c. 35 mm high, solid, triangularly ovate, almost equally convex, valves with 16–18 evenly spaced, narrowly rounded, lamellate, radial plicae, byssal notch deep, byssal fasciole broad ........................................................................................................... M. cloacata

—— Shell with 20–25 squamous radial plicae, flanked by riblet ...................................................... 4

4 Shell c. 70 mm high, elongate, weakly inflated, almost equally convex, valves with 20–25 evenly spaced, squamous radial plicae, flanked by a riblet on each side of each plica, byssal notch deep, byssal fasciole broad ................................................................... M. funebris

—— Shell with 22–23 primary radial plicae with widely set scales ................................................. 5

5 Shell c. 120 mm high, subcircular, weakly inflated, lv slightly more convex than rv, valves with 22–23 evenly spaced radial plicae bearing widely set scales, byssal notch deep, byssal fasciole broad ........................................................................................................... M. gloriosa

—— Shell with 24–30 primary narrow riblets and many riblets in interspaces ................................ 6

6 Shell c. 110 mm high, thin, moderately to strong prosocline, lv much more inflated than rv, strongly inequivalve and inequilateral, valves with c. 24–30 evenly and widely spaced, narrowly squamous radial plicae, many closely spaced radial riblets in interspaces, byssal notch deep, byssal fasciole narrow ..................................................................................... M. heterophyseta

—— Shell with 20–24 squamous radial plicae .................................................................................. 7

7 Shell c. 70 mm high, elongate, weakly inflated, almost equally convex, valves with 20–24 evenly spaced, squamous radial plicae, flanked by secondary riblet on each side in late growth stage or lacking, byssal notch deep, byssal fasciole broad .................................................... M. punctata

—— Shell with 20–24 radial plicae with tripartite scales .................................................................. 8

8 Shell c. 70 mm high, solid, circular to elongate, moderately inflated, lv slightly more convex than rv, valves with 20–24 evenly spaced, radial plicae with small tripartite scales, flanked by a spinous radial riblet, byssal notch deep, byssal fasciole broad ............................................................................................. M. sanguinea

—— Shell with c. 20 strongly squamous radial plicae, variable in prominence ................................................................................................................................ 9

9 Shell c. 80 mm high, solid, moderately inflated, lv slightly mor convex than rv, valves with c. 20 almost evenly spaced, strongly squamous radial plicae (5–7 with spathulate lamellae), byssal notch deep, byssal fasciole broad ..................................................................... M. scabricostata

—— Shell with c. 20 delicately squamous, rounded primary radial plicae ....................................................................................................................................... 10

10 Shell c. 120 mm high, solid, moderately inflated, almost equally convex, valves with c. 20 evenly spaced, fine squamous radial plicae, almost equal in prominence, flanked by a spinous radial riblet, secondary spinous radial riblets in interspaces, byssal notch deep, byssal fasciole broad ....................................................................... M. spinicostata