Ovivalvule: in Ephemeroptera; is an appendage of the female reproductive organs.
Ovoviviparous: when living young are born from eggs which are hatched in the body of the parent.
Pacific coast humid area: is that faunal area of the transition zone comprising the western parts of Washington and Oregon between the Coast Mountains and Cascade range: parts of northern California and most of the coast region from near Cape Mendocino south to the Santa Barbara Mountains. To the south and east it passes into the arid transition and in places into the upper Sonoran.
Pad: the pulvillus, or that part of it which is capable of extension and retraction in some Coleoptera.
Paddle: the flattened joints of posterior tarsi in aquatic Hemiptera.
Paedogenesis: reproduction in the sexually immature or larval stage.
Paedogenetic: reproducing in the sexually immature or larval stage.
Pagina: the surface of a wing: P. superior, is the upper surface; P. inferior, the lower surface: in Orthoptera, the external flattened surface of the caudal femora.
Pagiopoda: Heteroptera, in which the posterior coxae are not globose and the articulation is a hinge joint: see trochalopoda.