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Table 2 Differences between Chaetoderma galiciense sp. nov. and other Chaetoderma species from the Atlantic and Pacific

From: Four new species of Chaetodermatidae (Mollusca, Caudofoveata) from bathyal bottoms of the NW Iberian Peninsula

Species References Anterior and neck Trunk and tail Tassel
Chaetoderma argenteum Heath, 1911 [3, 26, 32] Narrow, elongated with a clear waist Lanceolate with median keel
Lanceolate, narrow with waist and blade and base forming an angle
Only acicular
Chaetoderma californicum Heath, 1911 [3, 26, 32] Sagittal, flat with median keel on the blade   Lanceolate, without median keel on the blade, waist, as well as blade and base forming an angle
Lanceolate, flat, with median keel ususaly with several ridges on the blade and base round, truncated or with a notch
Chaetoderma montereyense Heath, 1911 [3, 13, 32] Sagittal, smooth, flat with waist Lanceolate, flat, with median keel and round or truncated base
Lanceolate, smooth, with base and blade forming an angle
Acicular
Lanceolate, flat with median keel on the blade.
Chaetoderma nitidulum Lovén, 1845 [7, 16, 18] Lanceolate and smooth
Ensiform, waist, blade wider than the base
Lanceolate, waist, base with notch and median keel
Sagittal and median keel on the blade
Lanceolate, elongated, median keel and several lateral striations
Sagittal with notch, wings and median keel
Lanceolate, elongated and median keel
Acicular and long
Chaetoderma usitatum Scheltema, 1989 [27] Sagittal, flat and smooth. Lanceolate, smooth with blade and base forming an angle and some sclerites with median keel Lanceolate with median keel, with blade and base forming an angle
Lanceolate, flat, elongated with short crests on both sides of the median keel
Acicular broad, elongated, smooth and flat. Lanceolate with median keel
Chaetoderma galiciense sp. nov   Sagittal, flat, notched, with median keel and groove on both sides
Lanceolate, notched, with median keel, groove on both sides and blade and base forming an angle
Lanceolate, flat, with median keel and groove on both sides, truncated base or with a notch Lanceolate, elongated, flat, with two longitudinal grooves
Acicular and smooth