Dominant: a character more constant and conspicuous than any other: a type or series occurring in large numbers both as to genera, species and individuals and in which differentiation is yet active.
Dorsad: extending or directed toward the upper side.
Dorsal: of or belonging to the upper surface: in Diptera, that face of the laterally extended legs visible from above.
Dorsal bristles: see dorso-central.
Dorsal diaphragm: the wings of the heart, or the very thin membrane upon which these muscles rest: = pericardial diaphragm, q.v.
Dorsal gland orifices: in Diaspinae, oval orifices arranged in more or less distinct rows on the surface of the pygidium, through which is discharged the material of which the dorsal scale is formed.
Dorsal glands: see last preceding title.
Dorsal line: in caterpillars, extends longitudinally on the middle of the back or dorsal.
Dorsal scale: that part of the covering scale of the Diaspinae that lies above the insect, as opposed to the ventral scale, which lies below.
Dorsal space: in slug-caterpillars is the area between the sub-dorsal ridges.