As is typical for ark clams, species in this genus have a long, straight hinge line. Some species in this genus, such as Arca zebra and Arca noae, have a brown-and-white striped pattern. Arca attach themselves to rock with
byssal threads which protrude through a gap on the ventral (open) side.
^Ruǎn Jīnshān; Li Xiùzhū; Lín Kèbīng; Luō Dōnglián; Zhōu Chén; Cài Qīnghǎi (阮金山;李秀珠;林克冰;罗冬莲;周宸;蔡清海),
安海湾南岸滩涂养殖贝类死亡原因调查分析Archived 2020-07-17 at the
Wayback Machine (Analysis of the causes of death of farmed shellfish on the mudflats in the southern part of Anhai Bay), 《福建水产》 (Fujian Aquaculture), 2005-04