Duktilisilla

Duktilisilla is a genus of small, soft-bodied marine polychaete annelids found in shallow coastal habitats. First described in 2004 by marine biologists Helena A. Herman and Lin Kline, the genus currently comprises two species, Duktilisilla flexilis and Duktilisilla plana. Members are distinguished by an elongated, translucent body up to about 15 millimeters long, a smooth prostomium, and simple parapodial chaetae. The cuticle is highly elastic, enabling the animal to compress and stretch within narrow burrows.

Habitat and ecology: Duktilisilla species inhabit fine sand and mud in intertidal and shallow subtidal zones, often beneath the tide line. They are deposit feeders and detritivores, feeding on organic matter in sediment and pore-water. Burrowing activity aerates sediment, and individuals can reoccupy abandoned burrows quickly. Reproduction is believed to be sexual with external fertilization; early life includes free-swimming trochophore-like larvae that develop into juveniles after several weeks.

Distribution and taxonomy: Records come from temperate to tropical coasts of the Atlantic, Indian, and Pacific oceans, but distribution is patchy and many populations are undersampled. The genus name derives from Latin ductilis meaning “ductile” and the diminutive suffix -illa, referencing the flexible body form. The two recognized species, Duktilisilla flexilis and Duktilisilla plana, are differentiated by subtle differences in chaetal morphology and body proportions. Molecular data have begun to clarify relationships with related polychaete lineages.