The average date of the first 1-inch snow (1 inch or more) is December 2. The greatest depth of snow on the ground was 19 inches on February 8-10, 1982. The greatest 24-hour snowfall was 15 inches on January 1-2, 1999. Temperature and precipitation records go back to 1888 for Champaign-Urbana.
The name annelidia derives from annellus, which means little ring in Latin. The body of annelids is divided into segments that are separated by septa, and in many annelids, bristles called satae are attached to each segment.
The Polychaeta or polychaetes are a paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin.Indeed, polychaetes are sometimes referred to as bristle worms.olychaetes are segmented worms, generally less than 10 cm (3.9 in) in length, although ranging at the extremes from 1 mm (0.039 in) to 3 m (9.8 ft). They can sometimes be brightly coloured, and may be iridescent or even luminescent.