secondary riblet (MOLL: Bivalvia) A riblet appearing later in development, however, weaker than primary riblets.
secondary segmentation Any form of body segmentation not conforming with the embryonic metamerism.
secondary setae (ARTHRO: Insecta) In some caterpillars, setae of indefinite locations and numbers; usually not present on first instar.
secondary sexual characters Characters that distinguish the sexes, though not functioning directly in reproduction.
secondary shell layer (BRACHIO) Shell deposited by outer epithelium median of outer mantle lobes. a. In Articulata, secreted intracellularly as fibers. b. In Inarticulata, if present, never fibrous.
secondary sockets (BRACHIO) A pair of small depressions behind the cardinal process lobes that receive the secondary teeth.
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