Asteromphalus concavus

Taxonomic Information

Jr. Synonymy:

• Maruyama and Harwood, 1992, pp. 700-701, pl. 19, figs, 3, 4.
  

Morphometry:

Species Description:

Mini Description:This species differs from A. parvulus by (1) radiating sutures between hyaline sectors that are straight with only minor "zigzags;" (2) inner margins of areolated segments that are concave towards the valve center, except the two segments adjacent to primary ray that are angularly concave.

Original Name Asteromphalus concavus Harwood & Maruyama, 1992: Valve circular, slightly convex; areolared segments between hyaline rays of unequal size, smallest opposite primary ray; areolated segments surrounding primary ray of unequal size, as primary ray angles closer to one adjacent ray; sutures between central portions of hyaline rays straight and unbranching, with only a minor hint of "zigzag" structure at mid-length; inner border of areolar segments concave to broadly rounded toward valve margin, except for two segments adjacent to primary ray that are angularly concave.