Sergio Hanquet / Arrow crab (Sternorhynchus lanceolatus). Tenerife, Canary Islands.

Sergio Hanquet / Arrow crab (Sternorhynchus lanceolatus) portrait. Tenerife, Canary Islands.

Sergio Hanquet / Arrow crab (Sternorhynchus lanceolatus), close up. Tenerife, Canary Islands.

Pascal Kobeh / Yellowline arrow crab (Stenorhynchus seticornis / lanceolatus), Canary Islands

Jordi Chias / Arrow crabs (Stenorhynchus lanceolatus) pair, female underneath male after mating, male is guarding the fertilised eggs from other male Arrow crabs, protected from predators by Sea urchin quills, Gran...

Franco Banfi / Several arrow crab (Stenorhynchus lanceolatus) and green moray, South Tenerife, Canary Island.

Franco Banfi / Couple of Arrow Crab (Stenorhynchus lanceolatus) mating in front of a sea urchin, South Tenerife, Canary Islands, Atlantic Ocean.