Balanus (Barnacles)

Phylum Arthropoda: Subphylum Crustacea, Class Maxillopoda, Sublass Thecostraca

1. Phylum Arthropoda Subphylum Crustacea , Class Maxillopoda , Sublass Thecostraca

2. Balanus (Barnacles) Balanus Exclusively marine S hallow and tidal waters Roughly circular

3. Balanus (Barnacles) Sessile Filter-feeders Encrusters Shells composed of calcite Most are hermaphroditic

4. Balanus (Barnacles) Life Cycle Fertilized egg Nauplius Cyprid Adult

5. Nauplius

6. Cyprid

7. Balanus (Barnacles) Representative species: 1. Balanus glandula (Common acorn barnacle) -rugged white shell with a base that is not much wider than the top -shallow rocky area

8. Balanus glandula

9. Balanus (Barnacles) 2. B alanus crenatus (Crenate barnacle) - flat & white - attaches to discarded bottles and other debris

10. Balanus crenatus

11. Balanus crenatus

12. Balanus (Barnacles) 3. Balanus nubilus (Giant barnacle) - Rugged white shell with two inner plates that close - Can grow individually, but often seen in dense clusters growing on top of one another.

13. Balanus nubilus

14. Balanus nubilus

15. Balanus (Barnacles) 4 . Pollicipes polymerus (Gooseneck barnacle) -dense colonies on shallow, current swept reefs and walls -exterior shell covered with distinctive white plates

16. Pollicipes polymerus

17. Pollicipes polymerus