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Morphogenesis and histogenesis during the arm regeneration in a basket star Astrocladus dofleini (Euryalida, Ophiuroidea, Echinodermata)
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-11-07 , DOI: 10.1002/jmor.21296
Masanori Okanishi 1 , Hisanori Kohtsuka 1 , Toru Miura 1
Affiliation  

Basket stars, that is, Ophiuroidea in Echinodermata, exhibit distinctive morphological characteristics with their complicatedly branched arms that can regenerate immediately after mutilation. Although, in brittle stars, that is, ophiuroids with nonbranched arms, the arm regeneration process following accidental trauma or autotomy have been morphologically and histologically observed in several species, few studies have so far been carried out on the regeneration of branched arms in basket stars. In this study, the developmental and morphological features of arm regeneration in Astrocladus dofleini (Gorgonocephalidae, Euryalida, Euryophiurida), one of the most common basket star species in Japanese waters, was anatomically and histologically investigated. Results clearly showed the following phases during the arm regeneration: (a) repair phase, (b) early regenerative phase, (c) intermediate regenerative phase, (d) advanced regenerative Phase I, and (e) advanced regenerative Phase II. The morphogenetic process during the arm regeneration in the basket star showed similar patterns to those of nonbranched arms observed in other ophiuroids. However, differences were also seen between the two ophiuroid types, that is, there were some developmental features specific to the basket star. In the early regenerative phase, branching of coelomic cavities was observed prior to the formation of other tissues, probably inducing the later morphogenesis of branched arms. In addition, hard skeletal ossicles form rapidly at the advanced regenerative Phase II. These developmental features may have led the evolution of bizarre morphologies seen in basket stars, probably contributing to the adaptation to shallow waters from deep‐sea habitats.

中文翻译:

篮状星星形星状星形多夫莱尼 (Euryalida, Ophiuroidea, Echinodermata) 手臂再生过程中的形态发生和组织发生

篮状星,即棘皮动物中的 Ophiuroidea,表现出独特的形态特征,其复杂的分支臂在切割后可以立即再生。尽管在脆性星体中,即具有非分支臂的阿片类动物,意外创伤或自体切除后的臂部再生过程已在几个物种中进行了形态学和组织学观察,但迄今为止对篮状星体中分支臂的再生的研究很少. 在这项研究中,从解剖学和组织学上研究了 Astrocladus dofleini(Gorgonocephalidae、Euryalida、Euryophiurida)(日本水域中最常见的篮星物种之一)手臂再生的发育和形态特征。结果清楚地显示了手臂再生过程中的以下阶段:(a)修复阶段,(b) 早期再生阶段,(c) 中间再生阶段,(d) 高级再生阶段 I,和 (e) 高级再生阶段 II。篮星臂再生过程中的形态发生过程显示出与在其他类鸦片中观察到的非分支臂相似的模式。然而,这两种鸦片类型之间也存在差异,即存在一些特定于篮星的发育特征。在早期再生阶段,在其他组织形成之前观察到体腔的分支,这可能诱导了分支臂的后期形态发生。此外,硬骨小骨在高级再生阶段 II 迅速形成。这些发育特征可能导致了篮状星中奇异形态的演变,
更新日期:2020-11-07
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