P P 1 In Mendel's laws, the first parental generation; parents of a given individual of the F 1 generation. pachynema n. [Gr. pachys, thick; nema, thread] Thickened, paired chromosomes of meiosis prophase I, third stage; sometimes used as a synonym of pachytene. pachyodont a. | P P 1 In Mendel s laws the first parental generation parents of a given individual of the F 1 generation. pachynema n. Gr. pachys thick nema thread Thickened paired chromosomes of meiosis prophase I third stage sometimes used as a synonym of pachytene. pachyodont a. Gr. pachys thick odous tooth MOLL Bival-via With heavy blunt amorphous teeth. pachytene n. Gr. pachys thick tainia ribbon A prophase I stage in meiosis in which the chromosomes are thickened and paired and crossing over occurs. see pachynema. pad n. origin uncertain MOLL Bivalvia In oysters a thin aragonite layer on which the adductor muscle is inserted. paedogenesis n. Gr. pais child gennaein to produce 1. ARTHRO Insecta Parthenogenetic reproduction by insect larvae structurally unable to copulate. 2. Progenesis. see neoteny. paedomorphosis n. Gr. pais child morphosis shaping Evolutionary change in which ancestrally immature structures are retained. paedoparthenogenesis see paedogenesis pagina n. L. pagina leaf ARTHRO Insecta The surface of a wing inferior lower surface superior upper surface. pagiopodous a. Gr. pagios solid pous foot ARTHRO Insecta In aquatic Hemiptera refers to the posterior coxae having the articulation in the form of a hinge joint. see tro-chalopodous. paired see didymous pairing a. L. par equal Chromosome pairing highly specific association side by side of homologous chromosomes. pala n. pl. palae L. pala shovel ARTHRO Insecta In corixid Hemiptera the tarsus modified as a hair-fringed scoop for particle feeding. Online Dictionary of Invertebrate Zoology 651 palaeartic region A zoogeographical region encompassing Europe and northern Asia including Japan the Middle and Near East and areas along the southern coast of the Mediterranean Sea. palatal a. L. palatum palate 1. Belonging to the outer lip. 2. MOLL Gastropoda Referring to folds and lamellae of the shell. palatal setae ARTHRO Insecta In Culicidae four small peglike cibarial setae located on the anterior hard palate. palate n.
