Center of Biological and Health Science, UFOB - Univ. Federal do Oeste da Bahia, Barreiras, Bahia, Brazil.
Department of Zoology and Botany, UNESP - Univ. Estadual Paulista, São José do Rio Preto, São Paulo, Brazil.
Tissue Cell. 2023 Dec;85:102245. doi: 10.1016/j.tice.2023.102245. Epub 2023 Oct 15.
Molossus molossus is an insectivorous molossid bat that is important in the control of nocturnal insects. It is the nominal and the most representative species of the family. However, there are few studies about its reproduction. Thus, this study aimed to evaluate variations of its female reproductive organs during the different reproductive phases. Twenty adult females, divided into four sample groups (non-reproductive, early and advanced pregnancy and lactation), were submitted to morphological and morphometric analyses. Results show that the female reproductive system of M. molossus is composed of ovaries, a short bicornuate uterus, slightly convoluted uterine tubes and vagina. The system presents a distinct morphofunctional asymmetry, with a marked dextro-dominance. The right ovaries of all analyzed groups (NON, P1, P2, and LAC) showed follicles at different stages of development, a large number of interstitial glands and a small, but persistent corpus luteum. Ovulation is simple, unilateral and preferential, occurring exclusively in the right ovary. Follicular development in the left ovary usually does not pass the secondary stage. Implantation is fundic and preferential, occurring exclusively in the right uterine horn. The placenta is formed with two distinct chorioallantoic portions, one diffuse endotheliochorial, which covers the entire uterine cavity and regresses in the final stages of pregnancy, and the principal discoidal hemochorial portion, formed in the implantation site. The uterine cervix presents a pseudostratified epithelium, while the vagina has a little keratinized stratified epithelium, which does not accentually vary in the different reproductive stages, but can disrupt and shed in some cases.
马铁菊头蝠是一种食虫性的菊头蝠，在控制夜间昆虫方面具有重要作用。它是该科的模式种和最具代表性的物种。然而，关于其繁殖的研究较少。因此，本研究旨在评估其雌性生殖器官在不同繁殖阶段的变化。20 只成年雌性蝙蝠被分为四个样本组（非繁殖期、早期妊娠和晚期妊娠及哺乳期），进行形态学和形态计量学分析。结果表明，马铁菊头蝠的雌性生殖系统由卵巢、短双角子宫、稍卷曲的子宫管和阴道组成。该系统表现出明显的形态功能不对称性，具有明显的右旋优势。所有分析组（NON、P1、P2 和 LAC）的右侧卵巢均显示出处于不同发育阶段的卵泡、大量间质腺和小但持续存在的黄体。排卵是简单的、单侧的和优先的，仅发生在右侧卵巢。左侧卵巢的卵泡发育通常不会进入次级阶段。着床是基底部的和优先的，仅发生在右侧子宫角。胎盘由两个明显不同的绒毛膜尿囊部分组成，一个弥散的内皮绒毛膜，覆盖整个子宫腔，并在妊娠后期退化，另一个主要的盘状绒毛膜部分，形成在着床部位。子宫颈具有假复层上皮，而阴道具有少量角化的复层上皮，在不同的繁殖阶段没有明显变化，但在某些情况下会破裂和脱落。
