Illustration of Bivalve Shell Morphology - Scientific Drawing #3491221 (License: Personal Use)

The left shell displays a broad, fan-like morphology with prominent radial ribs converging at the umbo, typical of scallops or ark clams. The right shell is more elongated and compressed, revealing internal folds and a pronounced ligament area, suggesting a burrowing or byssal-attached species. Both are rendered in fine-line engraving with cross-hatching to convey texture and depth.

Used in educational biology resources, museum exhibits, or paleontology websites to illustrate shell taxonomy and functional morphology; targets students, researchers, and natural history enthusiasts seeking accurate anatomical references.