Larval and adult digestive tract of the carrion beetle Oxelytrum discicolle (Brullé, 1840) (Coleoptera: Silphidae)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2022-11-01 DOI:10.1016/j.asd.2022.101213
Alessandra Santana Batista Toni , Verônica Saraiva Fialho , Jamile Fernanda Silva Cossolin , José Eduardo Serrão
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引用次数: 2

Abstract

Oxelytrum discicolle is a necrophagous beetle occurring in Central and South America, with potential use in forensic entomology for investigations in the context of legal medicine. The present work aimed to describe the morphology of the digestive tract of larvae and adults and contributes to the knowledge about the digestion associated with necrophagy. In the three larval instars, the foregut is short and narrow, the midgut is a dilated tube, elongated with a smooth surface, and the hindgut is narrow and long, with small lateral projections and a dilated terminal region. The gut epithelium in the second and third instar larvae is vacuolated in the mid- and hindgut, with high production of apocrine secretions in the midgut lumen. In adults, the foregut is short, with small spines in the cuticular intima that covers the flattened epithelium. The midgut is dilated, with many short gastric caeca with regenerative cells in the blind portion, which differentiate in digestive columnar cells towards the midgut lumen. The hindgut is long and narrow, with an enlarged distal portion with folded epithelium lined by a thin cuticle. The histochemical tests reveal the absence of protein storage granules in the gut epithelium of larvae and adults. The gut characteristics of the carrion beetle O. discicolle are similar to those of other predatory and phytophagous Coleoptera, which may indicate that ancestry may influence the alimentary canal morphology more than the feeding habits.

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腐尸甲虫Oxelytrum discicolle (brull, 1840)的幼虫和成虫消化道(鞘翅目:Silphidae)
Oxelytrum discicolle是一种发生在中美洲和南美洲的尸食性甲虫,在法医昆虫学中具有潜在的用途,可以用于法律医学的调查。本工作旨在描述幼虫和成虫消化道的形态,并有助于了解与坏死相关的消化。3个幼虫的前肠短而窄,中肠为扩张管状,拉长,表面光滑,后肠窄而长,外侧突起小,终端区扩张。二龄和三龄幼虫的肠道上皮在中肠和后肠呈空泡状,中肠腔分泌大量大汗液。成人前肠短,在覆盖扁平上皮的角质层内膜上有小刺。中肠扩张,盲部可见许多短胃盲肠,再生细胞向中肠管分化为消化柱状细胞。后肠长而窄,远端部分增大,上皮呈折叠状,衬有薄角质层。组织化学试验表明,幼虫和成虫肠道上皮缺乏蛋白质储存颗粒。食腐甲虫的肠道特征与其他掠食性和植食性鞘翅目相似,这可能表明其祖先对消化道形态的影响大于对摄食习性的影响。
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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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