Steinernema keralense n. sp., a new entomopathogenic nematode (Nematoda: Steinernematidae) from India.

IF 1.3 3区生物学 Q4 PARASITOLOGY

Journal of Helminthology Pub Date : 2025-02-17 DOI:10.1017/S0022149X25000136

K M Anes, J Patil, M Babu, N Aarthi, B S Gotyal, A Josephrajkumar, P H Mhatre, J V Sajan, M T Gowda, V Půža

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引用次数: 0

Abstract

In this study, morphological and molecular features were used to identify a new Steinernema sp. from Kerala, India. Morphological and molecular features provide evidence for placing the new species into the longicaudum clade. The new species is characterized by the following morphological features: infective juveniles with a body length of 1067 μm (914-1268 μm); a distance from the anterior end to excretory pore of 82 μm (73-92 μm); a distance from anterior end to nerve ring of 105 μm (91-118 μm). The distinguishing feature of the infective juveniles of S. keralense n. sp. is the presence of seven ridges in the mid-body region, while all other species classified within the logicaudum clade to date are characterized by eight ridges. The first-generation males are characterised by 25 genital papillae, very short spicules, with a length of 68 μm (60-72 μm), and the SW% ratio is 136 (114-169). The new species is further characterized by sequences of the internal transcribed spacer and partial 28S regions of the ribosomal DNA. Phylogenetic analyses show that S. keralense n. sp. is closely related to species within the longicaudum clade.

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本研究利用形态学和分子特征鉴定了产自印度喀拉拉邦的一种新的 Steinernema sp.。形态学和分子特征为将该新种归入 longicaudum 支系提供了证据。该新种具有以下形态特征：感染性幼虫体长为 1067 μm（914-1268 μm）；前端到排泄孔的距离为 82 μm（73-92 μm）；前端到神经环的距离为 105 μm（91-118 μm）。Keralense n. sp.感染性幼虫的显著特征是身体中部有七条脊，而迄今为止被归入 logicaudum 支系的所有其他物种都有八条脊。第一代雄虫的特征是有 25 个生殖器乳突、非常短的刺，长度为 68 μm（60-72 μm），SW% 比率为 136（114-169）。核糖体 DNA 内部转录间隔区和部分 28S 区的序列进一步确定了该新物种的特征。系统发生学分析表明，S. keralense n. sp.与 longicaudum 支系中的物种关系密切。

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来源期刊

Journal of Helminthology 生物-动物学

CiteScore

2.80

自引率

12.50%

发文量

127

审稿时长

3 months

期刊介绍： Journal of Helminthology publishes original papers and review articles on all aspects of pure and applied helminthology, particularly those helminth parasites of environmental health, medical or veterinary importance. Research papers on helminths in wildlife hosts, including plant and insect parasites, are also published along with taxonomic papers contributing to the systematics of a group. The journal will be of interest to academics and researchers involved in the fields of human and veterinary parasitology, public health, microbiology, ecology and biochemistry.