Form Alternation of the Gonopod and Chela from Breeding to Non-breeding Season in Males of the Crayfish Cambaroides dauricus (Decapoda: Cambaroididae).

IF 1.5 3区 生物学 Q2 ZOOLOGY
Zoological Studies Pub Date : 2024-09-04 eCollection Date: 2024-01-01 DOI:10.6620/ZS.2024.63-24
Alda
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引用次数: 0

Abstract

The occurrence of cyclic morphological alternation in male crayfish of the family Cambaridae following molting is widely acknowledged. However, there remains a contentious issue within the genus Cambaroides: Some previous studies have proposed that male Cambaroides exhibit a pair of noncorneous Form II gonopods during the non-breeding season, while others argue that these species lack Form II in adult males. This study examined the color and shape of the corneous tips on the gonopod to determine its form. Additionally, morphometric methods were utilized to distinguish between Form II adults and juveniles. The results of the study confirm the presence of Form II adults in Cambaroides dauricus and Cambaroides similis. The Form I gonopod is characterized by four golden-colored corneous terminal elements, whereas the Form II gonopod features blunt, non-corneous terminal elements, on which the color is the same as that of the surrounding surface. Furthermore, cyclic dimorphism on the gonopod of C. dauricus was observed seasonally, and distinct morphological differences in the chela were noted between Form I and Form II adults.

达乌尔螯虾(十足目:螯虾科)雄虾在繁殖期和非繁殖期的性腺和螯虾形态变化。
小龙虾科雄性小龙虾在蜕皮后出现周期性的形态变化是公认的。然而,在Cambaroides属中仍然存在一个有争议的问题:一些先前的研究提出,雄性Cambaroides在非繁殖季节表现出一对非角质的II型性腺,而另一些人则认为这些物种在成年雄性中缺乏II型性腺。这项研究检查了性腺上角质层尖端的颜色和形状,以确定其形状。此外,形态计量学方法用于区分II型成虫和幼虫。研究结果证实了II型成虫在达乌尔cambarides和相似cambarides中存在。形形性腺的特征是四个金色的角质部末端元件,而形形性腺的特征是钝的,非角质部末端元件,其颜色与周围表面相同。此外,达乌尔螯蟹性腺器官的周期性二态性在季节变化中也有明显的变化,在I型成虫和II型成虫的螯合器官形态上存在明显的差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Zoological Studies
Zoological Studies 生物-动物学
CiteScore
2.80
自引率
6.20%
发文量
35
审稿时长
6-12 weeks
期刊介绍: Zoological Studies publishes original research papers in five major fields: Animal Behavior, Comparative Physiology, Evolution, Ecology, and Systematics and Biogeography. Manuscripts are welcome from around the world and must be written in English. When the manuscript concerns the use of animals or specimens in research, a statement must be included to the effect that the author(s) has adhered to the legal requirements of the country in which the work was carried out or to any institutional guidelines.
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