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Phylum Cnidaria > Class Anthozoa > Subclass Alcyonaria/Octocorallia > Order Pennatulacea
Photo index of sea pens on Singapore shores




Spiky sea pens
Pteroides sp.



Flowery sea pens
Family Veretillidae



Sea pencils
Lituaria
sp.



Slender sea pens
Virgularia sp.
 
15-20cm long. Fat central stalk with short (2-3cm) leaf-like structures with tiny spikes on the edges. Secondary polyps tiny, on the edges of the leaf-like structure. White or beige. When exposed at low tide, the central stalk is often bent over into half. Sandy shores near seagrasses. Commonly seen on our Northern shores.
15-20cm long. Sausage-like central stalk bears white flower-like secondary polyps (1-2cm) that have branched tentacles. Primary polyp thick and sausage-like. Maroon to orange, purple and white. When exposed at low tide, the secondary polyps are retracted and they look like limp sausages. Sandy shores near seagrasses. Commonly seen on our Northern shores.
4-10cm long. Stiff white cylindrical central stalk bears transparent secondary polyps (less than 1cm) that have branched tentacles. When exposed at low tide, the secondary polyps are retracted and they look like fat pencils stuck in the sand. Sandy shores near seagrasses. Commonly seen on our Northern shores. 15-20cm long. Stiff, narrow central stalk with short (1-2cm), leaf-like structures without spikes on the edges. Secondary polyps tiny, on the edges of the leaf-like structure. Maroon to orange, purple and white. When exposed at low tide, the stiff central primary polyp remains upright so they look like thin sticks stuck in the sand. Sandy shores near seagrasses. Commonly seen on our Northern shores.  
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photo index of
cnidarians on this site
Phylum Cnidaria
with soft body

solitary
  jellyfish
and jelly-like


anemones
and anemone-like

colonial
  bushy

fern-like

feathery

leathery

stick-like

thin branching
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