SIDIDAE INDET.
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publication ID |
https://doi.org/ 10.1111/j.1096-3642.2006.00204.x |
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DOI |
https://doi.org/10.5281/zenodo.5490742 |
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persistent identifier |
https://treatment.plazi.org/id/DA0A8786-8E61-FFD5-8C72-FDCF8FB6BD3D |
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treatment provided by |
Diego |
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scientific name |
SIDIDAE INDET. |
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Locality. Rocks of the northern slope of Ukha Mtount, 6 km west of Somon Khotont, Ara-Khangay Aymag, Mongolia. Numerous freshwater insects (or/and their larvae) from several orders (more than 1500 impressions), characteristic for the latest Jurassic and Lower Cretaceous, were also collected ( Rasnitsyn & Quicke, 2002). Only a single ctenopod specimen was found among numerous cladoceran remains (hundreds of impressions), the majority of which were assigned to adult prochydorids and ephippia of daphniids (see Smirnov, 1992).
Age . Jurassic/Cretaceous boundary, 145 Mya ( Rasnitsyn & Quicke, 2002).
Material. (22) PIN 4307/2005. AII.
Description. Only rami of antenna II of this putative sidid cladoceran have been preserved, although not too distinct ( Fig. 2E View Figure 2 ), antennal formula (9)–(> 11)/ (0)–(≥ 1)–(≥ 3). The reconstruction of the impression is shown in Fig. 2 View Figure 2 (F). Both rami seem to be thin, but this may be an artefact. Exopod length 0.91 mm. Apical setae of the exopod, one of the apical setae of the endopod and distolateral spines of the ramal segments are apparently missing. Approximate body size 2.7 mm.
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