Investigation of the ultrastructures and retinal arrangements of larval stomatopod eyes

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2023-03-01 DOI:10.1016/j.asd.2023.101251
Marisa S. McDonald , Kathryn D. Feller , Megan L. Porter
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Abstract

Though the transparent apposition eyes of larval stomatopod crustaceans lack most of the unique retinal specializations known from their adult counterparts, increasing evidence suggests that these tiny pelagic organisms possess their own version of retinal complexity. In this paper, we examined the structural organization of larval eyes in six species of stomatopod crustaceans across three stomatopod superfamilies using transmission electron microscopy. The primary focus was to examine retinular cell arrangement of the larval eyes and characterize the presence of an eighth retinular cell (R8), which is typically responsible for UV vision in crustaceans. For all species investigated, we identified R8 photoreceptor cells positioned distal to the main rhabdom of R1-7 cells. This is the first evidence that R8 photoreceptor cells exist in larval stomatopod retinas, and among the first identified in any larval crustacean. Considering recent studies that identified UV sensitivity in larval stomatopods, we propose that this sensitivity is driven by this putative R8 photoreceptor cell. Additionally, we identified a potentially unique crystalline cone structure in each of the species examined, the function of which is still not understood.

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口足类幼体眼超微结构及视网膜排列的研究
尽管口足类甲壳类动物幼虫的透明附着眼缺乏成年同类所知的大多数独特的视网膜特化,但越来越多的证据表明,这些微小的浮游生物拥有自己版本的视网膜复杂性。在本文中,我们使用透射电子显微镜检查了三个口足目超科中六种口足目甲壳类动物幼虫眼睛的结构组织。主要焦点是检查幼虫眼睛的视网膜细胞排列,并表征第八个视网膜细胞(R8)的存在,该细胞通常负责甲壳类动物的紫外线视觉。对于所研究的所有物种,我们鉴定了位于R1-7细胞主横纹肌体远端的R8感光细胞。这是R8感光细胞存在于口足类幼虫视网膜中的第一个证据,也是在任何甲壳类动物幼虫中首次发现的证据之一。考虑到最近的研究确定了口足类幼虫的紫外线敏感性,我们提出这种敏感性是由这种假定的R8感光细胞驱动的。此外,我们在所检查的每个物种中都发现了一种潜在的独特的结晶锥结构,其功能仍不清楚。
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来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
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