Silva Luane Samara Alves E, Guerrero-Ocampo Cecilia Margarita, Negreiros-Fransozo Maria Lucia, Teixeira Gustavo Monteiro
LabIAS (Laboratory Aquatic Invertebrates and Symbionts), Department of Animal and Plant Biology, State University of Londrina - UEL - 86057-970, Londrina, Paraná, Brazil..
Zootaxa. 2017 Feb 26;4237(1):zootaxa.4237.1.9. doi: 10.11646/zootaxa.4237.1.9.
This study describes and illustrates the morphology of the first juvenile stage of Aegla castro Schmitt, 1942. Ovigerous females were collected from May to July 2013, in Couro River (Mauá da Serra, Paraná, Brazil). These females were kept individually under controlled feeding, aeration, water temperature and quality and checked daily for hatching of juveniles. The newly-hatched juveniles were fixed in alcohol series and kept in 70% alcohol with glycerin in a 2:1 ratio prior to study under light microscopy. The newly-hatched juvenile of A. castro is the largest among aeglid species whose juveniles have been described. Aegla castro has asynchronous hatching. Some specimens were analyzed using scanning electron microscopy, revealing details of the setal morphology, some cephalothoracic appendages and lineae aeglicae. The number of setae in newly-hatched A. castro is lower than that described for other species, but does not appear to be diagnostic. However, A. castro is the only species described that combines the presence of four plumose setae on the third maxilliped exopod and 63-65 plumose setae on the maxilla exopod.
本研究描述并阐释了1942年施密特所描述的卡斯特罗溪蟹（Aegla castro）第一幼体阶段的形态特征。2013年5月至7月间，在巴西巴拉那州毛阿达塞拉的库罗河采集到抱卵雌蟹。这些雌蟹被单独饲养，饲养过程中控制投喂、通气、水温及水质，并每天检查幼体孵化情况。刚孵化出的幼体用酒精系列固定，在光学显微镜下研究前保存在70%酒精与甘油比例为2:1的混合液中。卡斯特罗溪蟹刚孵化出的幼体是已描述过幼体形态的溪蟹种类中最大的。卡斯特罗溪蟹孵化不同步。部分标本用扫描电子显微镜进行分析，揭示了刚毛形态、一些头胸部附肢及溪蟹线的细节。卡斯特罗溪蟹刚孵化出时的刚毛数量比其他种类少，但这似乎并非鉴别特征。然而，卡斯特罗溪蟹是唯一被描述为第三颚足外肢有四根羽状刚毛且上颌外肢有63 - 65根羽状刚毛的种类。
