Table 1 Relevant taxonomic characters of the North Atlantic and Mediterranean species of the genus Apseudopsis

A. adami sp. nov.

Pointed, rounded shoulders

2–6: Posterior corners

4

No

Inner: 3

Outer: 10

6

A. acutifrons (Sars 1882)

Long, acute

1, 2: Posterior corners. 3–6: Anterior and posterior corners

4

No

Inner: 3

Outer: 6–7

2, 3, 5, 6

A. annabensis (Guţu 2002)

Pointed, rounded shoulders

1–6: Posterior corners

5

No

Inner: 3

Outer: 6–7

6

A. apocryphus (Guţu 2002)

Pointed, rounded shoulders

No

3

No

Inner: 3

Outer: 8–10

3, 6

A. arguinensis (Guţu 2002)

Short, acute

2–6: Posterior corners

6

No

Inner: 3

Outer: 7–8

2, 6

A. bacescui (Guţu 2002)

Pointed, rounded shoulders

1–6: Posterior corners

4

No

Inner: 3

Outer: 6–7

2, 3, 6

A. elisae (Bacescu 1961)

Pointed, rounded shoulders

1–2: Posterior corners. 3–6: Anterior and posterior corners

5

Yes

Inner: 4

Outer: 8

2–6

A. hastifrons (Norman and Stebbing 1886)

Pointed, rounded shoulders

1: Posterior corners. 3–6: Anterior and posterior corners

6

No

Inner: 3

Outer: 7

2, 3, 5, 6

A. latreillii (Milne-Edwards 1828)

Pointed, rounded shoulders

No

3

Yes

Inner: 4

Outer: 10

2–6

A. mediterraneus (Băcescu 1961)

Pointed, rounded shoulders

1–6: Posterior corners

4

No

Inner: 3

Outer: 6–8

2, 6

A. minimus (Guţu 2002)

Pointed, rounded lobes

1–6: Posterior corners

3

No

Inner: 3

Outer: 6

n. d.

A. ostroumovi Bacescu and Carausu 1947

Pointed, rounded shoulders

1–6: Posterior corners

4

No

Inner: 3

Outer: 7–8

1–6

A. robustus (Sars 1882)

Pointed

No

4

Yes

Inner: 7–9

Outer: 15–16

1–6

A. tridens (Guţu 2002)

Long, with pointed shoulders

1–6: Posterior corners

4

No

Inner: 3

Outer: 10

3–6

A. uncidigitatus (Norman and Stebbing 1886)

Small, rounded

4, 5: Posterior corners

4

No

Inner: 5

Outer: 9

6