This family divides into 4 subclasses. The Curve is - in all cases - a representation of the analemma. (see page 'Displaying the Equation of Time'). All, except Spider Dials, require a nodus or a point gnomon. They are the commonest and easiest-to-make equation-corrected sundials. The Equation of Time is usually combined together with the longitude correction.
(see also Noon Marks, below)
These are easier to read than full analemmas, but either required the biannual change of the dial plate, as in the first two examples or two separate dials
These a subclass of the Full Analemma Class - but were often used to set church clocks.
These require a lot more calculation to delineate, but are used with a standard gnomon. A nice feature of the spider dial is its ability to indicate sunrise and sunset times