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

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