| a comparative ultrastructural study of spermatozoa of the teiid lizards cnemidophorus gularis gularis, cnemidophorus ocellifer, and kentropyx altamazonica (reptilia, squamata, teiidae). | the ultrastructure of the spermatozoa of cnemidophorus gularis gularis, cnemidophorus ocellifer, and kentropyx altamazonica is described for the first time. mature spermatozoa of cnemidophorus spp. and k. altamazonica differ in the occurrence of a perforatorial base plate, the enlargement of axonemal fibers 3 and 8, and shape of mitochondria. the comparisons of the ultrastructure sperm of cnemidophorus spp. and k. altamazonica with ameiva ameiva [j. morphol. (2002) in press] suggest that ameiva ... | 2002 | 12182806 |
| structural characterization and rapid manual isolation of a reptilian testicular tunic rich in leydig cells. | during the annual breeding season, the testes of the lizard cnemidophorus gularis are yellow-orange, oviod organs measuring almost 1 cm in greatest diameter. the pigment is confined to the testicular tunic, which contains a zone of leydig cells and vascular channels more than 50 mu thick. leydig cells constitute approximately 60% of the zone, with remaining space occupied by capillaries, sinusoids, and lymphatic vessels. lymphatics are concentrated at the interface between tunic and seminiferous ... | 1976 | 1034450 |
| behavioral facilitation of reproduction in sexual and unisexual whiptail lizards. | all-female, parthenogenetic species afford a unique test of hypotheses regarding the nature and evolution of sexuality. mating behavior accomplishes the transfer of gametes and stimulates the coordination of reproductive activity of the male and female. cnemidophorus uniparens, a parthenogenetic species, is believed to have resulted from the hybridization of two extant gonochoristic species, cnemidophorus inornatus and cnemidophorus gularis. c. uniparens regularly and reliably perform behaviors ... | 1986 | 3467325 |