Comparisons of developmental processes of air-breathing organs among terrestrial isopods (Crustacea, Oniscidea): implications for their evolutionary origins.

IF 4.1 2区 生物学 Q1 DEVELOPMENTAL BIOLOGY
Evodevo Pub Date : 2024-07-18 DOI:10.1186/s13227-024-00229-z
Naoto Inui, Toru Miura
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引用次数: 0

Abstract

Background: The acquisition of air-breathing organs is one of the key innovations for terrestrialization in animals. Terrestrial isopods, a crustacean lineage, can be interesting models to study the evolution of respiratory organs, as they exhibit varieties of air-breathing structures according to their habitats. However, the evolutionary processes and origins of these structures are unclear, due to the lack of information about their developmental processes. To understand the developmental mechanisms, we compared the developmental processes forming different respiratory structures in three isopod species, i.e., 'uncovered lungs' in Nagurus okinawaensis (Trachelipodidae), 'dorsal respiratory fields' in Alloniscus balssi (Alloniscidae), and pleopods without respiratory structures in Armadilloniscus cf. ellipticus (Detonidae).

Results: In N. okinawaensis with uncovered lungs, epithelium and cuticle around the proximal hemolymph sinus developed into respiratory structures at post-manca juvenile stages. On the other hand, in Al. balssi with dorsal respiratory fields, the region for the future respiratory structure was already present at manca 1 stage, immediately after hatching, where the lateral protrusion of ventral epithelium occurred, forming the respiratory structure. Furthermore, on pleopods in Ar. cf. ellipticus, only thickened dorsal cuticle and the proximal hemolymph sinus developed during postembryonic development without special morphogenesis.

Conclusions: This study shows that the respiratory structures in terrestrial isopods develop primarily by postembryonic epithelial modifications, but the epithelial positions developing into respiratory structures differ between uncovered lungs and dorsal respiratory fields. This suggests that these two types of respiratory structures do not result from simple differences in the degree of development. Future analysis of molecular developmental mechanisms will help determine whether these are the result of heterotopic changes or have different evolutionary origins. Overall, this study provides fundamental information for evolutionary developmental studies of isopod respiratory organs.

陆生等脚类动物(甲壳纲,Oniscidea)呼吸空气器官发育过程的比较:对其进化起源的影响。
背景:获得呼吸空气的器官是动物陆生化的关键创新之一。陆生等脚类动物(甲壳类)是研究呼吸器官进化的有趣模型,因为它们根据不同的栖息地表现出不同的呼吸结构。然而,由于缺乏有关其发育过程的信息,这些结构的进化过程和起源尚不清楚。为了了解这些结构的发育机制,我们比较了三种等足类动物不同呼吸结构的发育过程,即冲绳长尾藻(Nagurus okinawaensis,气管足类)的 "无盖肺"、Alloniscus balssi(Alloniscidae)的 "背呼吸区 "和Armadilloniscus cf. ellipticus(Detonidae)的无呼吸结构的胸足:结果:在冲绳濑鱼(N. okinawaensis)中,肺部无盖,近端血淋巴窦周围的上皮和角质层在后满月幼体阶段发育成呼吸结构。另一方面,在具有背侧呼吸区的 Al. balssi 中,未来呼吸结构的区域在孵化后的漫卡 1 阶段就已出现,腹侧上皮侧向突出,形成呼吸结构。此外,在椭圆蟾蜍的胸足上,胚后发育过程中只形成了增厚的背侧角质层和近端血淋巴窦,没有特殊的形态发生:本研究表明,陆生等脚类动物的呼吸结构主要是通过胚后上皮的改变而发育的,但发育成呼吸结构的上皮位置在无盖肺和背呼吸野之间有所不同。这表明这两种类型的呼吸结构并不是由简单的发育程度差异造成的。未来对分子发育机制的分析将有助于确定这些结构是异位变化的结果,还是有不同的进化起源。总之,本研究为等足类呼吸器官的进化发育研究提供了基础信息。
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
Evodevo
Evodevo EVOLUTIONARY BIOLOGY-DEVELOPMENTAL BIOLOGY
CiteScore
7.50
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: EvoDevo publishes articles on a broad range of topics associated with the translation of genotype to phenotype in a phylogenetic context. Understanding the history of life, the evolution of novelty and the generation of form, whether through embryogenesis, budding, or regeneration are amongst the greatest challenges in biology. We support the understanding of these processes through the many complementary approaches that characterize the field of evo-devo. The focus of the journal is on research that promotes understanding of the pattern and process of morphological evolution. All articles that fulfill this aim will be welcome, in particular: evolution of pattern; formation comparative gene function/expression; life history evolution; homology and character evolution; comparative genomics; phylogenetics and palaeontology
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