Gieysztoria shiyanensis Wang & Xia, 2014

Xia, Xiao-Jie, Lu, Yan-Hong & Wang, An-Tai, 2014, A new species of Aequales, genus Gieysztoria (Rhabdocoela: Dalyelliidae) from China, Zoological Systematics 39 (2), pp. 229-235 : 232

4.1 Gieysztoria shiyanensis Wang & Xia , sp. nov.

The freshwater Rhabdocoela turbellarians genus Gieysztoria can be divided into two groups—Aequales and Inaequales, based on the morphology of stylet (Tyler et al., 2012; Van Steenkiste et al., 2012; Lai, 2013). Furthermore, Inaequales is divided into 4 subgroups: Fenestratae, Radiatae, Aberrantes, and Falcatae ( Luther, 1955; Damborenea et al., 2005; Van Steenkiste et al., 2012). The new species is belong to Aequales group according to Luther (1955).

By comparing with the configuration and structure of the sclerotic stylet, G. shiyanensis Wang & Xia , sp. nov. is similar with five similar species: G. diadema ( Hofsten, 1907) , G. tigrensis (Noreña-Janssen, 1995) , G. italica ( Luther, 1955) , G. lugubris (Reisinger, 1924) , and G. oryzae (Nasonov, 1929) . Their characteristics are listed in Table 1. Among them, G. shiyanensis Wang & Xia , sp. nov. have 15 spines, while 8 spines in both G. diadema and G. tigrensis , 18 or 18–19 spines in G. italica , G. lugubris , and G. oryzae . Additionally, their total length of the stylet are different.