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Issue: Vol. 7 No. 1: February 2024
Type: Correspondence
Published: 2024-02-27
DOI: 10.11646/palaeoentomology.7.1.4
Page range: 76-79
Abstract views: 67
PDF downloaded: 2

SEM morphological study on carapace of Cyclestheria hislopi and comparison with fossil taxa

State Key Laboratory of Palaeobiology and Petroleum Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China
Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar; State Key Laboratory of Genetic Resources and Evolution & Yunnan Key Laboratory of Biodiversity Conservation of Gaoligong Mountain, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China; Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation, Menglun 666303, China
Myanmar

Abstract

The circum-tropically distributed cryptic extant clam shrimp species Cyclestheria hislopi (Baird, 1859) is thought to be the only species of Cyclestherida, although molecular data show that its populations on different continents have large genetic distance (Schwentner et al., 2013). Its parthenogenetical reproduction and direct ovoviviparous development in the dorsal brood chamber indicate that C. hislopi is the sister taxon of all Cladocera (Olsen et al., 1996; Olsen, 1999; Olesen & Richter, 2013; Schwentner et al., 2018). While the large carapace, capable of enclosing the whole body, shows a close similarity with spinicaudatans. In this paper we document its carapace ornamentation by the use of a scanning electron microscope (SEM) and compare to related fossil taxa.

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