Department of Biology, Evolutionary Ecology Laboratories, Provo, UT, United States of America.
BYU Life Science Museum, Brigham Young University, Provo, UT, United States of America.
PLoS One. 2023 Feb 2;18(2):e0281267. doi: 10.1371/journal.pone.0281267. eCollection 2023.
Xenophallus umbratilis is a freshwater livebearing fish that exhibits unique antisymmetry in the male gonopodium, which terminates in either a dextral or sinistral twist. This asymmetry in the gonopodium suggests that males might exhibit side-biased behavior when interacting with females to mate. We conducted two assays to assess the laterality of male and female mating interactions based on gonopodial morphology. We observed lateralized mating behavior in one test where males with sinistral gonopodial morphology interacted with a single female. However, we did not find lateralized mating behavior in males with dextral gonopodial morphology. We also examined male and female positioning in trials that placed a single female with five males, all with the same morphology. These trials also showed no evidence of lateralized body positioning.
弯鳍单孔鲀是一种淡水有袋鱼类，其雄性交接器表现出独特的反称性，要么是右旋扭曲，要么是左旋扭曲。这种交接器的不对称性表明，雄性在与雌性交配时可能表现出偏侧性行为。我们进行了两项实验，根据交接器形态评估了雄性和雌性交配互动的偏侧性。在一项测试中，我们观察到具有左旋交接器形态的雄性与单一雌性互动时表现出偏侧性行为。然而，我们没有在具有右旋交接器形态的雄性中发现偏侧性行为。我们还检查了在一项实验中雄性和雌性的定位情况，该实验将单一雌性与五只具有相同形态的雄性放在一起。这些实验也没有显示出身体定位的偏侧性证据。
