Zyzzyzus parvula

• Main Authors: Soto, Joan J., Peña, Álvaro L.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Anthoathecata; Tubulariidae; Zyzzyzus; Zyzzyzus parvula; Ross Sea; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.5934901; http://treatment.plazi.org/id/03B887B7A47EFFE2E983FD3AFD049C12

Zyzzyzus parvula (Hickson & Gravely, 1907) (Fig. 5 a–h) Material examined. ANT XVII/3 : 111-9 , numerous polyps, up to 45 mm high, on E. generale, H. interpolatum, Sc. unifurcata and T. longstaffi , with mature gonophores; 111-18 , a single polyp, c. 1 mm high, on Lafoea dumosa (Fleming, 1820). Remarks. As also mentioned by Svoboda & Stepanjants (2001), many juveniles have been observed sharing substrate with adults, pointing to a gregarious habit, and putatively restricted dispersal capabilities. Juvenile specimens, especially the youngest ones, have slightly capitate aboral tentacles (Fig. 5a), which is in agreement with the genus diagnoses by Campos et al. (2007). Originally described from the Ross Sea as Lampra parvula Hickson & Gravely, 1907, the species has had a complicated taxonomical history, being re-allocated in several genera, even belonging to different families. It was considered as Corymorpha by Stepanjants (1972), and later re-allocated in Lampra by Stepanjants & Svoboda (1999). Svoboda & Stepanjants (2001) included it in the reestablished genus Monocaulus . Nowadays, after the revision of the genus Zyzzyzus by Campos et al. (2007), included within Tubulariidae, the species is considered as a member of this genus (Schuchert 2018). Svoboda & Stepanjants (2001) re-described the syntypes of Z. parvula and provided a detailed account on new material from the Weddell Sea. However, the authors pointed out, based on in situ photographs from the Weddell Sea (Svoboda & Stepanjants 2001:57), that living specimens are white, but reddish-orange after preservation. We disagree with that assumption. In situ photographs by Brueggeman (1998) referable to Z. parvula show deep-red to brown polyps, with a pale-orange basal section, coloration similar to that found in preserved specimens. Therefore, those white specimens mentioned by Svoboda & Stepanjants (2001) could actually correspond to an undescribed species. Material examined here entirely agrees with the description given by ...