Marine life individuals per square meter and accounting for about 80% of all individual animals on earth, their diversity of life cycles, and their presence at various trophic levels point at an important role in many ecosystems. Echinoderms (Greek for "spiny skin") is a phylum which contains only marine invertebrates. The adults are recognizable by their radial symmetry (usually five-point) and include starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies. Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 7000 living species, making it the second-largest
Broad-headed spiny rat end of the wet season. Broad-headed spiny rat The broad-headed spiny rat ("Clyomys laticeps") is a spiny rat species from South America. The etymology of the species name is the Latin word "laticeps" meaning "wide-headed". The species has a head-body length that ranges from , with a tail long, and weigh between . They have short ears and limbs, and feet with powerful claws adapted for digging. The fur is interspersed with spines; it is grizzled reddish or yellowish and black over most of the body, and paler grey to almost white on the underparts. Broad-headed spiny rats are native