Sertularella pinnata Clark, 1877
- Dataset
- GBIF Backbone Taxonomy
- Rank
- SPECIES
- Published in
- Clark, S. F. (1877). Report on the hydroids collected on the coast of Alaska and the Aleutian Islands by W.H. Dall, U.S. Coast Survey, and party, from 1871 to 1874 inclusive. - Proceedings of the Academy of Natural Sciences of Philadelphia 1876: 209-235, plates. https://www.marinespecies.org/hydrozoa/aphia.php?p=sourcedetails&id=35652
Classification
- kingdom
- Animalia
- phylum
- Cnidaria
- class
- Hydrozoa
- order
- Leptothecata
- family
- Symplectoscyphidae
- genus
- Symplectoscyphus
- species
- Symplectoscyphus pinnatus
general
Stem: up to 200 mm high, 5 mm thick at base, plumose, with several secondary and tertiary branches given off in the same or nearly the same plane; stem and lower branches heavily fascicled, ultimate branches monosiphonic. Monosiphonic branch internodes short, very wide, nodes oblique, tilted in opposite directions, hydrocladium arising a little more than halfway up internode; internode with three hydrothecae, one in axil of hydrocladium, one below and one opposite.
Hydrocladia alternate on a short apophysis marked by a constriction in perisarc, hydrocladial internodes variable in length, two to five hydrothecae along each side, nodes distinct, oblique.
Hydrothecae seated on front of hydrocladium, separated late rally, abcauline walls lightly sinuous, hydrotheca widest about middle, adcauline wall convex, completely adnate to internode; length-width ratio of abcauline to adcauline wall 1:1.2; hydrotheca without true floor, a short spur of perisarc extending inwards from base of adcauline wall. Margin tilted upward at an angle of 55° - 60° to hydrocladial axis, circular in frontal view, with four low equidistant cusps, one abcauline, one adcauline and two lateral; rim thickened, margin not replicated, operculum of four flaps.
Gonotheca large, elongate conical, one to several along hydrocladium inserted without pedicel at base of a hydrotheca, connection with hydrocladium a wide foramen, gonotheca adpressed to or laying c lose to hydrocladium, perisarc thick with up to 14 smooth, deep transverse corrugations; corrugations less distinct on adcauline side and fading out proximally; orifice a shallow, circular apical depression, transverse to slightly oblique with a short adcauline lip; operculum a single thick flap.
Colour: Deep yellow to orange.
general
Was mistakenly described as a Bryozoan, Caberea pinnata Lamouroux 1816
Infertile material of Sertularella quadridens, Sertularella diaphana and Sertularella pinnata cannot be easily distinguished on microscopic characters alone, a situation that has probably led to much past misidentification of species. When fertile they are, however, readily separated, the gonothecae of S. quadridens and S. decipiens being more or less tubiform and ridged, that of S. diaphana is conical with longitudinal pleats while that of S. pinnata is conical and transversely corrugated.
Name
Bibliographic References
- Cairns, S. D., D. R. Calder, A. Brinckmann-Voss, C. B. Castro, P. R. Pugh, et al., 1991: Common and Scientific Names of Aquatic Invertebrates from the United States and Canada: Cnidaria and Ctenophora. American Fisheries Society Special Publication, no. 22. vii + 75.
- Cairns, Stephen D., Dale R. Calder, Anita Brinckmann-Voss, Clovis B. Castro, Daphne G. Fautin,..., 2002: Common and Scientific Names of Aquatic Invertebrates from the United States and Canada: Cnidaria and Ctenophora, Second Edition, 2002. American Fisheries Society Special Publication 28. xi + 115.
- Clark, S. F. (1877). Report on the hydroids collected on the coast of Alaska and the Aleutian Islands, by W.H. Dall, U.S. Coast Survey, and party, from 1871 to 1874 inclusive. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 28, 209-238.
- Spencer Jones, M.,D’Hondt, J.-L.,Watson, J.E.,Gordon, D.P.: Discovery of the lost type species of <i>Caberea </i>(Bryozoa) and the identity of <i>Cabera pinnata </i>Lamouroux, 1816 (Hydroida)