Primitive streak see germ band

primogyne n. [L. primus, first; Gr. gyne, female] The primary type female of a species.

primordial a. [L. primordialis, original] Original or primitive; having the simplest and most underdeveloped character.

primordial soup The solution or suspension of organic molecules thought to have given rise to life.

primordial valve (ARTHRO: Crustacea) In Lepadomorpha and Verrucomorpha Cirripedia, one of 5 chitinous plates of cyr-pid larvae.

primordiotrichy n. [L. primordialis, original] The hypothetical theory of chaetotaxy of ancestral types. see atactotrichy.

primordium n.; pl. -dia [L. primordialis, original] 1. The origin; beginning. 2. The first cells that are identifiable as the beginning development of an organ or structure; anlage; blastema; fundament.

principalia [L. principium, foundation] (PORIF) Spicules constituting main skeletal framework.

priodont a. [Gr. prion, saw; odous, tooth] (ARTHRO: Insecta) In Coleoptera, referring to male Lucanidae bearing small mandibles. see amphidont, teleodont.

prionodont a. [Gr. prion, saw; odous, tooth] (MOLL: Bivalvia) With teeth developed transversely to the cardinal margin;

similar to taxodont.

priority n.; pl. -ties [L. prior, former, superior] The principle that of two competing names for the same taxon (below the rank of an infraorder) the validity is based on which was published first, either by date or page (when in the same journal).

prisere n. [L. primus, first; serere, to join] A primary sere; complete natural succession of communities, from bare habitat to climax. see plagiosere.

prismatic a. [Gr. prisma, prism] 1. In the shape of a prism; microscopically honeycombed; a needle-like prism structure. 2. (MOLL: Bivalvia) Pertaining to a type of shell structure that consists of calcite or aragonite prisms.

proala n. [L. pro, before; ala, wing] (ARTHRO: Insecta) The anterior wing; fore wing.

proandry n. [Gr. pro, before; aner, male] 1. Anterior pair of testes. 2. (ANN: Oligochaeta) Testes restricted to segment X or homoeotic equivalent.

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