Marongiu Martina Francesca, Porcu Cristina, Pascale Noemi, Bellodi Andrea, Cau Alessandro, Mulas Antonello, Pesci Paola, Porceddu Riccardo, Follesa Maria Cristina
Dipartimento di Scienze della Vita e dell'Ambiente, Università degli Studi di Cagliari, Via Tommaso Fiorelli 1, 09126 Cagliari, Italy.
Consorzio Nazionale Interuniversitario per le Scienze Mare (CoNISMa), Piazzale Flaminio 9, 00196 Roma, Italy.
Animals (Basel). 2021 Sep 9;11(9):2653. doi: 10.3390/ani11092653.
Oviducal glands (OGs) are distinct expanded regions of the anterior portion of the oviduct, commonly found in chondrichthyans, which play a key role in the production of the egg in-vestments and in the female sperm storage (FSS). The FSS phenomenon has implications for understanding the reproductive ecology and management of exploited populations, but little information is available on its taxonomic extent. For the first time, mature OGs from three lecithotrophic oviparous and four yolk-sac viviparous species, all considered at risk from the fishing impacts in the central western Mediterranean Sea, were examined using light microscopy. The OG microanatomy, whose morphology is generally conserved in all species, shows differences within the two reproductive modalities. Oviparous species show a more developed baffle zone in respect to viviparous ones because of the production of different egg envelopes produced. Among oviparous species, and show presence of sperm, but not sperm storage as observed, instead, in and in all the viviparous sharks, which preserve sperm inside of specialized structures in the terminal zone.
输卵管腺（OGs）是输卵管前部明显扩张的区域，常见于软骨鱼类，在卵子包裹物的产生和雌性精子储存（FSS）中起关键作用。FSS现象对于理解受开发种群的生殖生态学和管理具有重要意义，但关于其分类范围的信息却很少。首次使用光学显微镜检查了来自三种卵黄营养型卵生和四种卵黄囊胎生物种的成熟OGs，所有这些物种都被认为受到地中海中西部捕捞影响的威胁。OG的微观解剖结构在所有物种中形态通常是保守的，但在两种生殖方式之间存在差异。由于产生的卵包膜不同，卵生物种相对于胎生物种显示出更发达的隔板区。在卵生物种中，[此处原文可能缺失物种名称]显示有精子存在，但未观察到精子储存，而在[此处原文可能缺失物种名称]和所有胎生鲨鱼中则观察到精子储存在末端区域的特殊结构内。
