[2] Leptometra celtica has ten pinnate arms that are typically 7–10 cm in length with neatly held side branches.

They are arranged in irregular columns dimorphically about the organism's stalk allowing for locomotion and attachment to deep sea structures.

The species has been found at depths between 20 and 1247 m in the western Mediterranean and has been studied in the Algarve region on the southwest coast of Portugal.

The species plays an important role in marine environments by taking in large amounts of organic particles and regulating food chain production.

For this reason, the presence of benthopelagic fish alongside crinoids like L. celtica can serve as indicators of highly productive regions of shelf-breaks.