Serama do not breed true to size. The very tiny size seems to be a recessive gene, so an A sized bird can come from B and C sized parents.
Serama come in all colors and do not breed true to any one color.
The complete ancestry of the Serama is uncertain, but the Red Jungle Fowl, the Common Malaysian Village Bantam (a hodge podge of many breeds), the Japanese Bantam, and the Silkie are likely contributors.
Serama mature at 16-18 weeks.
Serama have a incubation period of 19 to 21 days.
Serama cannot handle temperatures below 40 F degrees.
The term "type" refers to the outline or silhouette of the bird.
Links
Jerry's Seramas
http://www.jerrysseramas.com/index.html
US Serama club
http://www.serama.us/
Serama Council of North America
http://www.seramacouncilofnorthamerica.com/
serama on: Feather Site The Poulrty Page
http://www.feathersite.com/Poultry/CGP/Sri/BRKSri.html
Size Classes
Mature Cocks Mature Hens
Class A - up to 350 grams (12.35 oz.) Class A - up to 325 grams (11.46 oz.)
Class B - up to 500 grams (17.64 oz.) Class B - up to 425 grams (14.99 oz.)
Class C - up to 600 grams (21.16 oz.) Class C - up to 500 grams (17.64 oz.)
Class D - up to 750 grams Class D - up to 600 grams
Cockerels - One Class Only
150 to 350 grams (5.29 to 12.35 oz.)
Pullets - One Class Only
150 to 325 grams (5.29 to 11.46 oz.)
Chick Category
Regardless of sex - up to 150 grams (5.29 oz.)