Pascal Kobeh / Detail of a banded urchin (Echinotrix calamaris) with its anus clearly visible. Sulu Sea, Philippines.
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David Fleetham / Sea urchin crab (Echinoecus pentagonus), female inside Common banded urchin (Echinothrix calamaris) rectum. Hawaii.
01558317
Jordi Chias / Pearlfish (Carapus acus) outside of host Sea cucumber (Stichopus regalis) at night. These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain....
01558316
Jordi Chias / Pearlfish (Carapus acus) outside of host Sea cucumber (Stichopus regalis) at night. These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain....
01558315
Jordi Chias / Pearlfish (Carapus acus) reversing into anus of Sea cucumber (Stichopus regalis). These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain. Me...
01558314
Jordi Chias / Pearlfish (Carapus acus) in anus of Sea cucumber (Stichopus regalis). These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain. Mediterranean...
01558313
Jordi Chias / Pearlfish (Carapus acus) in anus of Sea cucumber (Stichopus regalis). These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain. Mediterranean...
01558312
Jordi Chias / Pearlfish (Carapus acus) in anus of Sea cucumber (Stichopus regalis). These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain. Mediterranean...
01558311
Jordi Chias / Pearlfish (Carapus acus) outside of host Sea cucumber (Stichopus regalis) at night. These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain....
01558310
Jordi Chias / Pearlfish (Carapus acus) outside of host Sea cucumber (Stichopus regalis) at night. These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain....
01558309
Jordi Chias / Pearlfish (Carapus acus) outside of host Sea cucumber (Stichopus regalis) at night. These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain....
01471394
Guy Edwardes / 2020VISION / Male Mallard (Anus platyrhnchos) on frozen floodwater, male, Catcott Lows, Somerset Levels, Somerset, England, UK, December.