The copula, or girdle band, in direct contact with the valve. Accessory structures such as septa or partecta arise from the valvocopula.

See also cingulum.

Alternative Terms

first girdle band
Image Credit: Eduardo Morales
Scanning electron micrograph of both cingula of Staurosira construens with the bands of silica, the copulae, composing them. The arrows indicate the first girdle band, or valvocopula, of each cingulum.