Terrifying (but tiny!) bryozoans

Images 1 and 2: Beania mirabilis (source) cc-by-nc-sa

Image 3: Electra monostachys (source) cc-by-nc-sa

Image 1: “Scanning electron microscope image of a bryozoan colony” (Source)

Image 2: “This skeleton of a living bryozoan, collected at Bahia de los Angeles, Baja California, clearly shows this typical colonial organiation.

Each individual, or zooid, is enclosed in a sheath of tissue, the zooecium, that in many species secretes a rigid skeleton of calcium carbonate. Each zooid in this electron micrograph is less than a millimeter long and has a single opening, the orifice. Through this opening, the lophophore, a ring of ciliated tentacles centered on the mouth, protrudes to capture small food particles. The lophophore can be retracted very rapidly by specialized retractor muscles, and the opening closed by a doorlike operculum, visible on some of the zooids in the picture at the left.”

Source

Image 3: Membraniporella nitida (source) cc-by-nc-sa

More info: http://en.wikipedia.org/wiki/Bryozoa

Ceramium spp. and a bonus Callithamnion sp. (red algae)

Image 1: Source: Algaebase

Caption: Ceramium juliae, Morris Point, Stilbaai, South Africa. 31 Oct 2001. Herre Stegenga. © Herre Stegenga 

Image 2: Source: Algaebase

Caption: Ceramium mazatlanense. Hawaii; scale 300 µm. 15 Aug 2011. J.M. Huisman. © J.M. Huisman.

Image 3: Source: WoRMS (cc-by-nc-sa)

Caption: Ceramium pallidum

Description: microscope, location: Spain, Galicia, Coruña, Pantín’s beach, 2007
AuthorBárbara, Ignacio
JPG file – 1.22 MB – 1000 x 1350 pixels
added on 2008-03-19 – 356 views
WoRMS Taxa on this image: 
Ceramium pallidum (Nägeli ex Kützing) Maggs & Hommersand, 1993

Image 4: Ceramium ciliatum © C. Romero Zarco – Universidad de Sevilla, 2003

http://www.aloj.us.es/carromzar/algas/Ceramiaceae.html

Image 5: Callithamnion sp., same source as Image 4