Novel integrative data for Indomalayan echiniscids (Heterotardigrada): new species and old problems

IF 1.9 3区 生物学 Q3 EVOLUTIONARY BIOLOGY
Piotr Gąsiorek, Łukasz Michalczyk
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Abstract

The Malay Archipelago comprises thousands of islands that house a variety of biomes, from tropical rainforests of Borneo, Sumatra and Celebes to the Lesser Sundas deciduous forests. In this paper, we present an extensive genetic and morphological dataset for the genus Kristenseniscus, demonstrating the presence of the walteri complex that contains several pseudocryptic species. One of them, Kristenseniscus exanthema sp. nov., is described from Ambon and Seram (the Moluccas). First genetic data are released for two potentially pantropical Echiniscus species: E. africanus Murray, 1907 and E. pusae Marcus, 1928. Furthermore, Echiniscus minutus sp. nov. (Sulawesi Tengah), exhibiting trunk spines and contrasting dorsal sculpturing that comprise both pores and epicuticular granules, is found to constitute a separate evolutionary lineage within the Echiniscus spinulosus morphogroup (epicuticular granules are typically absent in the spinulosus group). Based on the phylogenetic reconstructions involving ca. 80 spp. of echiniscids representing the Echiniscus evolutionary line, we hypothesise that the tropical and subtropical regions served as the main radiation zone for this heterotardigrade clade. Finally, Pseudechiniscus (Meridioniscus) celebesiensis sp. nov. (Sulawesi Tengah) is a characteristic species with an apomorphic lack of claw spurs and intricate dorsal cuticular sculpturing. Our findings suggest that the tropical areas of the globe harbour a phylogenetically important but yet mostly uncovered portion of Earth’s tardigrade diversity.

Abstract Image

印度洋棘皮动物(Heterotardigrada)的新综合数据:新物种和老问题
马来群岛由数以千计的岛屿组成,这些岛屿拥有多种生物群落,从婆罗洲、苏门答腊岛和西里伯斯岛的热带雨林到小巽他群岛的落叶林。在本文中,我们展示了 Kristenseniscus 属的大量遗传和形态学数据集,证明了 Walteri 复合物的存在,其中包含多个假隐性物种。其中一个物种--Kristenseniscus exanthema sp.首次公布了两个潜在的泛热带棘皮苣苔物种的遗传数据:E. africanus Murray, 1907 和 E. pusae Marcus, 1928。此外,新发现的 Echiniscus minutus sp.(苏拉威西腾格里省)表现出躯干棘刺和由气孔和表皮颗粒组成的对比鲜明的背部雕刻,被认为是 Echiniscus spinulosus 形态群中的一个独立进化世系(spinulosus 形态群中通常不存在表皮颗粒)。根据代表棘皮动物进化系的约 80 种棘皮动物的系统发育重建,我们推测热带和亚热带地区是这一异棘皮动物支系的主要辐射区。最后,Pseudechiniscus (Meridioniscus) celebesiensis sp.我们的研究结果表明,全球热带地区蕴藏着地球上重要的、但大部分尚未发现的沙蜥多样性。
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来源期刊
Organisms Diversity & Evolution
Organisms Diversity & Evolution 生物-进化生物学
CiteScore
3.60
自引率
0.00%
发文量
56
审稿时长
>12 weeks
期刊介绍: Organisms Diversity & Evolution (published by the Gesellschaft fuer Biologische Systematik, GfBS) is devoted to furthering our understanding of all aspects of organismal diversity and evolution. Papers addressing evolutionary aspects of the systematics, phylogenetics, morphology and development, taxonomy and biogeography of any group of eukaryotes, recent or fossil, are welcome. Priority is given to papers with a strong evolutionary and/or phylogenetic focus. Manuscripts presenting important methods or tools or addressing key theoretical, methodological, and philosophical principles related to the study of organismal diversity are also welcome. Species descriptions are welcome as parts of a manuscript of broader interest that strive to integrate such taxonomic information with the other areas of interest mentioned above.
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