Sertularella polyzonias

Sertularella polyzonias is a branching colonial hydroid in the family Sertulariidae.[2]

Sertularella polyzonias
The hydroid Sertularella polyzonias, Mull of Kintyre, Scotland.
Scientific classification
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa
Order: Leptothecata
Family: Sertularellidae
Genus: Sertularella
Species:
S. polyzonias
Binomial name
Sertularella polyzonias

Description

This hydroid branches rather sparsely and irregularly compared with Sertularella gayi. The main stems and side branches are thin, wavy, and of a pale straw colour. As in all Sertularella species, the side branches support alternate hydrothecae, one to each internode. The hydrothecae are bulbous at the base and become narrower towards the rim which has four cusps, and an operculum that consists of four triangular flaps. The gonothecae are generally ovate in shape and slightly rugose in texture. A raised tubular structure with four vertically projecting denticles surrounds the aperture. Although the male and female gonothecae are similar in shape the male is considerably smaller and is white, whilst the female is yellow in colour. Colonies are typically 40–50 mm in height.[3]

Distribution

Reported widely from the Atlantic Ocean and Mediterranean Sea, shallow sublittoral to considerable depths.[4]

References
  1. Linnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Editio decima, reformata. Laurentius Salvius: Holmiae. ii, 824 pp.
  2. WoRMS (2004). Sertularella polyzonias. In: Schuchert, P. (2017). World Hydrozoa database. Accessed through: World Register of Marine Species on 2018-02-03.
  3. Picton, B.E. & Morrow, C.C. (2016). Sertularella polyzonias (Linnaeus, 1758). [In] Encyclopedia of Marine Life of Britain and Ireland. Accessed on 2018-02-03.
  4. iNaturalist, 2018. Sertularella polyzonias
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