Pick the hairy helmet crab (TECH)

A. B.

© Jeff Adams © Jeff Adams

Correct Answer: B

A.

B.

Two features in this photo distinguish the hairy helmet crab (TECH) from the European green crab (CAMA):

1. The green crab carapace is pentagon shaped, while a hairy helmet crab carapace is diamond shaped.

2. Hairy helmet crab has 6 marginal teeth (widest at the 5th) while the green crab only has 5 and is widest at the last tooth.

3. The hairy helmet crab is covered with bristles and bumps, even on the carapace. Green crab have some fine hairs on their legs, but a smooth carapace and shell overall.

2.

© Jeff Adams

© Jeff Adams

1.

European green crab (CAMA)

Hairy helmet crab (TECH)

X

© ?????????? © ????????

Pick the hairy helmet crab (TECH)

A. B.

Correct Answer: A

A.

B.

Two features in this photo distinguish the hairy helmet crab (TECH) from the spider crab (SPID):

1. The hairy helmet crab is covered in hairs on its carapace, legs, and claws (even if hairs not present on a molt, the carapace is still very bumpy).

2. The spider crab is longer from front to back than it is wide with a very pronounced rostrum that protrudes far between the eyes, while the hairy helmet crab, though diamond shaped, is still wider than it is long.

2.

1.

Hairy helmet crab (TECH)

Spider crab (SPID)

X

Pick the hairy helmet crab (TECH)

A. B.

Correct Answer: A

A.

B.

Two features in this photo distinguish the hairy helmet crab (TECH) from the European green crab (CAMA):

1. The hairy helmet crab has 6 distinct marginal teeth and is widest at the 5th while the green crab just has 5 marginal teeth.

2. The green crab is a pentagon shape while the hairy helmet crab is a diamond shape.

2.

1.

Hairy helmet crab (TECH)

European green crab (CAMA)

X

© ?????????

Pick the hairy helmet crab (TECH)

A. B.© Greg Jensen

Correct Answer: B

A.

B.

Two features in this photo distinguish the hairy helmet crab (TECH) from the spider crab (SPID):

1. The spider crab has an extremely pronounced rostrum, sticking out far beyond the eyes, which is a main distinguishing feature.

2. The spider crab’s walking legs are also particularly slender compared to the hairy helmet crab.

3. The hairy helmet crab is very bumpy/covered in bristles all over its body - carapace, walking legs, claws.

3.

2.

1.

Hairy helmet crab (TECH)

Spider crab (SPID)

© Greg Jensen

X