Spiky Sea Pen Spotted At Changi Beach Intertidal Walk In Singapore | Wild Life Sea Creatures
Spiky Sea Pen Spotted At Changi Beach Intertidal Walk In Singapore. Wild Life Sea Creatures In Singapore. Nature In Singapore. Amazing Sea Creatures You've Never Seen Before. Spiky sea pen
Pteroeides sp
This feathery colony is sometimes seen on our Northern shores. In soft silty sand and near seagrasses. The colony does not harbour symbiotic algae (zooxanthellae) and can thus thrive in murky water.
Features: Those seen on our shores are about 15-20cm long (but some species of Pteroides are said to grow to 60cm long!). According to Reef Corals of the Indo-Malayan Seas globally, there are about 17 species of Pteroeides.
Each colony is stout and feather-like. Made up of a sausage-like 'stem' some are plain, others with brown blotches. Some have an orange 'foot', usually buried and seen only in uprooted sea pens. Short (2-3cm) leaf-like structures symmetrically on both sides of the 'stem'. These 'leaves' supported by rays of many long needle-like sharp spikes that stick out of the leaf edge. When exposed at low tide, the central stalk is often bent over in half so the colony looks like a limp feather.
Tiny feeding polyps (autozooids) with 8 branched tentacles emerge from these 'leaves' when submerged. The autozooids can retract completely, leaving tiny bumps on the 'leaf' edges. The colony also has another kind of polyp that sucks in water (siphonozooids) and which are minute, numerous and crowded near edges of the 'leaves'.
Sea pens are colonial marine cnidarians belonging to the order Pennatulacea. The order Pennatulacea, commonly known as sea pens, are colony-forming benthos belonging within suitcases Octocorallia (Anthozoa, Cnidaria). Thus far, there has been only one molecular study focusing on the phylogenetic relationships within the order Pennatulacea, which mainly treated deep-sea species, and thus information on shallow water species is still lacking. There are 14 families within the order and 35 extant genera; it is estimated that of 450 described species, around 200 are valid.[2] Sea pens have a cosmopolitan distribution, being found in tropical and temperate waters worldwide, as well as from the intertidal to depths of more than 6100 m. Sea pens are grouped with the octocorals, together with sea whips (gorgonians).
Although the group is named for its supposed resemblance to antique quill pens, only sea pen species belonging to the suborder Subselliflorae live up to the comparison. Those belonging to the much larger suborder Sessiliflorae lack feathery structures and grow in club-like or radiating forms. The latter suborder includes what are commonly known as sea pansies.
Amazing Sea Creatures You've Never Seen Before
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