Sea Pen (Pennatula) - Marine Cnidarian Illustration & Biology #178267 (License: Personal Use)

This black-and-white engraved illustration shows a sea pen (genus Pennatula), a colonial soft coral belonging to the order Pennatulacea. The image details its elongated, feathery rachis composed of numerous polyps and the bulbous, anchoring peduncle embedded in sediment. Such illustrations were historically used in marine biology texts to convey morphology before color photography.

Used in educational articles, marine biology resources, or museum digital archives to illustrate cnidarian diversity; matches user intent for learning about deep-sea organisms, historical scientific illustration, or taxonomy.