| Echinocardium australe | ||||||||||||||||
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| Echinocardium australe Gray, 1855 |
Echinocardium australe, or the New Zealand heart urchin is a sea urchin of the family Loveniidae, endemic to New Zealand. Sea urchins are small globular spiny sea cat animals composing most of class Echinoidea. In Biological classification, family ( Latin Loveniidae is a family of Sea stars in the order Paxillosida. Endemism is the Ecological state of being unique to a place Endemic species are not naturally found elsewhere New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island Length is up to 40 mm. The Millimetre ( American spelling: millimeter, symbol mm) is a unit of Length in the Metric system, equal to
Echinocardium australe are common but difficult to find animals living buried in soft-sediment habitats. There is a small ventilation slit in the surface of the sediment, or a characteristic track, but often even these small signs are missing. These small sediment-coloured urchins move with almost imperceptible slowness beneath the sediment surface - generally less than 1. 5 m per day. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International
The animal is covered in slender spines of different lengths, which are directed rearwards to streamline the body for burrowing. The tube feet are arranged in two groups, upper and lower. Tube feet are the many small tubular projections found most famously on the ventral face of a Starfish 's arms but are characteristic of the Water vascular system The upper tube feet are long and used to fashion and maintain the vertical ventilation shaft.
Heart urchins ingest organic matter and microscopic plants as they move horizontally in the upper 3 to 4 cm of the sediment. A centimetre ( American spelling: centimeter, symbol cm) is a unit of Length in the Metric system, equal to one hundredth The movement of the animal displaces sediment particles, a process called bioturbation. In Oceanography and Limnology, bioturbation is the displacement and mixing of Sediment particles by benthic Fauna (animals or This movement influences the transport of oxygen and nutrients across the sediment–water interface, and are important to algae which in turn are an important source of food for soft-sediment organisms and indeed the base of the entire marine food web. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Algae ( sing. alga are a large and diverse group of simple typically Autotrophic organisms ranging from Unicellular to Multicellular forms
References
- Miller M & Batt G, Reef and Beach Life of New Zealand, William Collins (New Zealand) Ltd, Auckland, New Zealand 1973
- NIWA
This echinoderm-related article is a stub. HarperCollins is a Publishing company owned by News Corporation. Year 1973 ( MCMLXXIII) was a Common year starting on Monday (link will display full calendar of the 1973 Gregorian calendar. Echinoderms (Phylum Echinodermata) are a phylum of marine Animals (including Sea stars) You can help Wikipedia by expanding it.