Rows of tube-feet lie within these grooves. The ambulacral grooves are supported by a definite arrangement of ossicles: two rows of rod-shaped ambulacral ossicles form the V-shaped ambulacral groove itself. Where these meet they form the prominent ambulacral ridge on their inner surface.bove: the oral surface of a starfish. The mouth is visible in the centre of the disc, in the middle of a circular or pentagonal peristomial membrane or peristome (shown in darker orange). A groove, called the ambulacrum, extends from the tip of each arm toward the peristome.
Lyons, Colorado. The Town of Lyons is a Statutory Town in Boulder County, Colorado, United States. The town population was 2033 at the 2010 United States Census, up from 1585 at the 2000 United States Census. Lyons is located at the confluence of North St. Vrain Creek and South St. Vrain Creek, 20 miles (32 km) east of Rocky Mountain National Park.
Zip Code 80540 is located in the state of Colorado in the Denver metro area. Zip code 80540 is primarily located in Boulder County. Portions of 80540 are also located in Larimer County. The official US Postal Service name for 80540 is LYONS, Colorado. Portions of zip code 80540 are contained within or border the city limits of Allenspark, CO, Lyons, CO, . Zip code 80540 is within area code 720, area code 303 and area code 970.