What thinner form of spaghetti is named on Wikipedia's spaghetti page?

Spaghettini is the thinner form of spaghetti named on Wikipedia’s spaghetti page.

The name uses the Italian diminutive ending -ini, indicating a smaller or thinner version. Spaghettini retains spaghetti’s long, solid, cylindrical shape but has a narrower diameter, so it generally cooks more quickly and gives sauces a slightly lighter coating.

It sits within a family of related long pasta shapes. Spaghettoni is thicker than standard spaghetti, while capellini is much thinner. Vermicelli occupies a middle range in some classifications, although its exact thickness varies between Italian and English-speaking traditions.

Spaghettini is not the same as fettuccine, which is a flat ribbon pasta, or rigatoni, which is a short, ridged tube. The distinction is based primarily on shape and thickness rather than on a different basic dough: dried versions are commonly made from durum-wheat semolina and water.