Unraveling the insect head: Segmentation and pancrustacean homologous

IF 1.3 3区农林科学 Q2 ENTOMOLOGY

Arthropod Structure & Development Pub Date : 2025-05-31 DOI:10.1016/j.asd.2025.101462

Patricia Nel , Michael S. Engel , Carmen Soriano , Sylvain Pont , Lauriane Jacquelin , Laurence Dollinger , Laure Desutter-Grandcolas , Tony Robillard , Romain Garrouste , Dany Azar , André Nel

{"title":"Unraveling the insect head: Segmentation and pancrustacean homologous","authors":"Patricia Nel , Michael S. Engel , Carmen Soriano , Sylvain Pont , Lauriane Jacquelin , Laurence Dollinger , Laure Desutter-Grandcolas , Tony Robillard , Romain Garrouste , Dany Azar , André Nel","doi":"10.1016/j.asd.2025.101462","DOIUrl":null,"url":null,"abstract":"<div><div>The segmental composition of the arthropodan head is a long-standing biological question. This is particularly controversial in insects where considerable fusion and modification obfuscate the postembryonic segmentation. Here we propose a reinterpretation of the insect head morphology and segmentation, which also accords with current genetic and embryological data. The new interpretation of a generalized insect head is based on the discovery of intercalary segment remnants (the intercalates), thanks to the use of 3D-reconstruction of a Cretaceous thripidan and to a reassessment of the ‘anterior tentorial arm’ as the anteriormost part of a lateral segmental suture from the contact of the head lobe and gnathal segments during development. We show that the two-jointed mandibular articulation is likely symplesiomorphic for Insecta, no longer supporting the clade ‘Dicondylia’, the most diverse lineage of all insects. We discuss new perspectives on the ‘labrum’ in Pancrustacea.</div></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":"87 ","pages":"Article 101462"},"PeriodicalIF":1.3000,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Arthropod Structure & Development","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1467803925000544","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENTOMOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The segmental composition of the arthropodan head is a long-standing biological question. This is particularly controversial in insects where considerable fusion and modification obfuscate the postembryonic segmentation. Here we propose a reinterpretation of the insect head morphology and segmentation, which also accords with current genetic and embryological data. The new interpretation of a generalized insect head is based on the discovery of intercalary segment remnants (the intercalates), thanks to the use of 3D-reconstruction of a Cretaceous thripidan and to a reassessment of the ‘anterior tentorial arm’ as the anteriormost part of a lateral segmental suture from the contact of the head lobe and gnathal segments during development. We show that the two-jointed mandibular articulation is likely symplesiomorphic for Insecta, no longer supporting the clade ‘Dicondylia’, the most diverse lineage of all insects. We discuss new perspectives on the ‘labrum’ in Pancrustacea.

Abstract Image

查看原文本刊更多论文

昆虫头的解剖：分节与盘壳类同源

节肢动物头部的节段组成是一个长期存在的生物学问题。这在昆虫中尤其有争议，因为相当大的融合和修饰混淆了胚胎后的分割。在此，我们提出了昆虫头部形态和分割的重新解释，这也符合目前的遗传和胚胎学数据。对广义昆虫头部的新解释是基于对白垩纪thripidan的3d重建，以及对“前幕臂”的重新评估，这是在发育过程中头叶和颌节接触的外侧节缝合线的最前端，发现了蝶间节残留物（intercalates）。我们表明，对于昆虫来说，双关节下颌关节可能是同构的，不再支持所有昆虫中最多样化的分支“双髁”。我们讨论了关于泛壳科“唇形”的新观点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Arthropod Structure & Development 生物-昆虫学

CiteScore

3.50

自引率

10.00%

发文量

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.