Pyura stolonifera

Hartmeyer, R 1911
Phylum Chordata
Class Ascidiacea
Order Stolidobranchia
Family Pyuridae
  • Common species along intertidal rocky shores and on the upper regions of submerged shallow reef pinnacles were they form dense aggregations.
  • Individuals can grow to a large size (up to 20cm in diameter).
  • Two large siphons open in the upper part of the body close together.
  • This species lack the pointed papillae on and around the siphons as is characteristic of Pyura herdmani.
  • The test may be clean and relatively smooth to heavily encrusted by various other organism such as algae, sponges or other ascidian.
  • Elaborately branched tentacles form a ring at the opening of the branchial sac.
  • Dorsal tubercle in the form of two spiral cones.
  • Branchial sac has 6 folds with longitudinal vessels.
  • The oesophagus is long, the stomach voluminous with a large hepatic gland and the intestines form a loop obscured by endocarps.
  • Single gonads on each side are divided into lobes which may be hidden by endocarps.
© 2015 Shirley Parker-Nance 2015-02-22 Bell Buoy 014.JPG © 2015 Shirley Parker-Nance 2015-03-22 Shark Alley 120.JPG

  • Millar, R. H. 1962 Further descriptions of South African ascidians56:113-221
  • Monniot, C.; Monniot, F.; Griffiths, C. and Schleyer, M. 2001 Ascidians of South Africa.108:1-141
  • Shenkar, N.; Gittenberger, A.; Ruis, M.; Rocha, R. M.; Swalla, B.; et al. 2017 Ascidiacea World Database. Atriolum marinense Kott, 2001. Accessed through: World Register of Marine Species at: on 2019-03-12