Polyzoa-The Occurrence of Entoprocta in Indian Waters
1915; Zoological Survey of India; Volume: 7; Issue: 2 Linguagem: Inglês
10.26515/rzsi/v7/i2/1915/163106
ISSN0375-1511
Autores Tópico(s)Marine Invertebrate Physiology and Ecology
ResumoOnthe stems of specimens of the Hydroid genera Bimeria and Tubu-Zaria collected at Port Canning on March loth, 1912, I fin].a minute entoproctous potyzoon that appears to be specifically identical with Busk's Bare-n~sia (or Ascopodaria) dl:screta, a species originally found at Tristan da Cunha in 100 to 150 fathoms by the " Challenger" Expedition (Busk, Zool.Rep. "Challenger," vol.xvii, part L (Polyzoa II), p. 44, pI.X,, but recently recorded from Ceylon by Miss L. Thornley, apparently from shallow water (Herdman's Rep. Ceylon Pearl Fisheries, part iv, p. I28).My specimens are much smaller than the type-specimens, the full-grown heads measuring only about 0•21 mm. in length and 0'18 mm. in transverse diameter, the same measurements as given by Busk being 0•5 and 0•4 mm.The length of the stalk and the proportions of the muscular bulb at its base vary considerably and the zoaria are colourless.Otherwise I can detect no divergence from Busk's original figures and description.Miss Thornley states that the specimens she examined were of a reddish colour.In view of the conditions under which the species V\I~as growing at Port Canning it is not surprising that it should be dwarfed, and I do not consider it advisable in the circumstances to give the phase a separat~ name.My specimens were found on Hydrozoa that grew on stones and logs partially embedded in dense mud at the edge of the river Mutlah.They were just uncovered by an unusually low tide.The water at the point at which they occurred contains in March about 25"46 per mille of saline residue.Prof. K. Ramunni lVlenon has recently sent me a specimen of Barentsia gracilis (Sars) taken in JVladras harbour.The species is common in Europe and has been recorded from the Pacific coast of N. America by Miss Robertson (PrOf.Calif.A cad. Sci.(3) II, p. 344) and from Australian waters by Kirkpatrick (Ann.Mag.Nat.Hist.(6) II, p. 21, 1888).The list of Entoprocta as yet known from Indian seas is a very short one, comprising, so far as I am aware, only three species:-Barentsia gracilis.
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