Eirene Eschscholtz 1829

Genus Eirene Eschscholtz, 1829 Diagnosis: Eirenidae medusa with distinct, broad gastric peduncle; cirri absent; with or without excretory pores; 4-6 simple radial canals; gonads on subumbrellar part of radial canals, not extending to gastric peduncle; numerous statocysts (>8). The hydroids of ��� Campanulina ���, ��� Campanopsis ��� or ��� Eugymnanthea ��� type (see Bouillon et al., 2006). Remark: Clytia species with a short gastric peduncle like Clytia gregaria (see below) are formally not distinguishable from Eirene species. Thus, some nominal Eirene species (Schuchert, 2017a; see Du et al., 2010 for a key to the species) with a shallow peduncle and no excretory papillae could therefore also be Clytia species. Life-cycle studies or DNA barcodes (Schuchert et al., 2017) have to confirm the identity of Eirene pentanemalis Lin, Xu & Huang, 2013, Eirene brevistylus Huang & Xu, 1994, and other similar species.
Published as part of Peter Schuchert, 2017, Systematic notes on some leptomedusa species with a description of Neotima galeai n. spec. (Hydrozoa, Cnidaria), pp. 351-375 in Revue suisse de Zoologie 124 (2) on page 358, DOI: 10.5281/zenodo.893549
{"references":["Eschscholtz F. 1829. System der Acalephen. Eine ausfuhrliche Beschreibung aller medusenartigen Strahltiere. Ferdinand Dummler, Berlin, pp. 1 - 190, 16 pls.","Bouillon J., Gravili C., Pages F., Gili J. M., Boero F. 2006. An introduction to Hydrozoa. Memoires du Museum National d'Histoire Naturelle 194: 1 - 591.","Schuchert P. 2017 a. World Hydrozoa database. Accessed at http: // www. marinespecies. org / hydrozoa on 2017 - 04 - 24.","Du F., Xu Z., Huang J., Guo D. 2010. New records of medusae (Cnidaria) from Daya Bay, northern South China Sea, with descriptions of four new species. Proceedings of the Biological Society of Washington 123 (1): 72 - 86.","Schuchert P., Hosia A., Leclere L. 2017. Identification of the polyp stage of three leptomedusa species using DNA barcoding. Revue suisse de Zoologie 124 (1): 167 - 182. https: // dx. doi. org / 10.5281 / zenodo. 322675","Lin M., Xu Z. - Z., Huang J. - Q., Guo D. - H., Wang C. - G., Xiang P., Dirhamsyah 2013. Two new species of leptomedusae from the Bitung Strait, Indonesia (Cnidaria). Acta Zootaxonomica Sinica 38 (4): 765 - 761.","Huang J., Xu Z. 1994. Description of four new species of Hydromedusae from Fujian Province (Athecatae - Anthomedusae and Thecatae - Leptomedusae). Acta Zootaxonomica Sinica 19 (2): 132 - 138."]}