Moura, Carlos J., 2015, The hydrozoan fauna (Cnidaria: Hydrozoa) from the peaks of the Ormonde and Gettysburg seamounts (Gorringe Bank, NE Atlantic), Zootaxa 3972 (2), pp. 148-180: 154

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Eudendrium  sp.

(fig. 2 G, H, I)

Material studied. Ormonde, stn 1: fertile colonies, frequent on cauli of alga Zonaria tournefortii  , DBUA 1514.01, Genbank accession no. KM 402031View Materials. Ormonde, stn 3: few exemplars, delicate, unbranched and monosiphonic colonies, overgrowing cauli of Zonaria tournefortii  ; hydrocauli with few annulations, DBUA 1514.07. Ormonde, stn 4: frequent on the alga Zonaria tournefortii  , overgrowing other algae conjunctly with Orthopyxis integra  ; DBUA 1512.02. Gettysburg, stn 5: fertile specimens; small, delicate and unbranched colonies; overgrowing Zonaria tournefortii  and Aglaophenia pluma  ; DBUA 1514.02. Gettysburg, stn 6: abundant on Zonaria tournefortii  , fertile and monosiphonic colonies; DBUA 1514.03; Genbank accession no. KM 402026View Materials. Gettysburg, stn 7: frequent on cauli of Zonaria tournefortii  , hydrocauli somewhat annulated, DBUA 1514.04. Gettysburg, stn 8: fertile, predominantly on cauli of Zonaria tournefortii  , less common on hydrorhizae of Sertularella ellisii  , DBUA 1514.05. Gettysburg, stn 9: abundant, on small shrimp and cauli of the alga Zonaria tournefortii  , DBUA 1512.01. Gettysburg, stn 10: few colonies on cauli of Zonaria tournefortii  , pedicels strongly annulated, DBUA 1514.06.

Remarks. This biological material consists of extremely small, monosiphonic and stolonal rarely branched colonies, developing sporosacs on hydranths. Perisarc is smooth, corrugated or have annulated stretches. Nematocysts identified correspond to small microbasic euryteles (5–7.4)x(2.7–3.6)Μm, r= 1.5–2.4, and large unidentified capsules on the hydranth body (10.9–14)x(4.3–7.4)Μm, r= 2–2.8 ( Figs. 2View FIGURE 2. A H, I)

The present taxon resembles Eudendrium album Nutting, 1898  and E. simplex Pieper, 1884  , but 16 S haplotype data did not reveal any particular phylogenetic relationship with any of these species, as well as to a great variety of other Eudendrium  species mainly found in the NE Atlantic and Mediterranean (Schuchert & Moura, unpublished phylogenetic analyses). Because both morphologically and molecularly, this biological material of Eudendrium  is differentiated from the other herein reported, and because this is the only study reporting Eudendrium  taxa in the Gorringe, this represents the first record of this inconspicuous species in the Gorringe.

The publication of 16 S sequences obtained from samples of stations 1 and 6, is expected to allow a future correct taxonomic identification of this biological material.


Zoological Collection of the Biology Department, University of the Azores