Plectroninia celtica n. sp. a Overview of paratype specimen SMF 8013, station GeoB 6722-1. b Overview of holotype specimen SMF 8012, station GeoB 6722-1. c SEM image showing the large regular-fused tetractine meshwork (clearly visible as honeycomb pattern in (a) and (b) and the lamina layer around the perimeter of the sponge consisting of small, fused, irregular and spined tetractines. d SEM close up image showing parts of the large tectractines and how they are fused with the meshwork of the small irregular and spined tectractines (GeoB 6722-1). e SEM image of ectosomal triactines lying unconnected on the large tetractine meshwork (GeoB 6722-1)
Holotype : Stored at Forschungsinstitut und Naturmuseum
Senckenberg, Frankfurt am Main, Germany, inventory number SMF 8012;
Propeller Mound, station GeoB 6722-1, 52°08.88N, 12°46.30W,
735 m water depth, substrate Lophelia pertusa ,
measurements 5×3 mm, collected 18th August 2000; see
Fig. 2b . .
Paratype : Inventory number SMF 8013; Propeller Mound,
same station, substrate dead skeletal portions of the scleractinian
Lophelia pertusa , measurements 4×2.5 mm; see
Fig. 2a .
Shape, size and consistency : Sponge encrusting, initially
circular (Fig. 2a ), with increased growth achieving a
slightly irregular outline.
Maximum size observed 5 mm×3 mm (Fig. 2b ).
Ectosome : Thin smooth layer with scattered nearly
equal-rayed triactines which are lying separate and parallel to the
surface without touching (Fig. 2e ).
Choanosome : Basal layer formed of small fused
tetractines, irregular and spined, with straight rays and forming a
lamina around the perimeter of young specimens (Fig. 2c , d
Main skeleton formed of large regular fused tetractines (Fig.
2a – c ), with the smaller rays angled halfway and fusing with
neighbouring rays and the basal layer, building a honeycomb
pattern; large apical rays pointing upwards and supporting
Spicules : Endosomal basal small fused tetractines, with
large and nearly regularly arranged conical spines, with the base
and height nearly equal to the diameter of the rays; with straight
rays of 40–60 μm (Fig. 2c , d ); endosomal large regular
fused tetractines, apical rays 140–170 μm, angled section
50–60 μm (Fig. 2a – c ).
Regular ectosomal triactines, with straight rays 140–250 μm
long (Fig. 2e ).
Continuing growth of the large fused tetractines is evidenced in
Fig. 2 and would in any case be a requisite for a secondarily
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This image is from the article titled "Plectroninia celtica n. sp. (Calcarea, Minchinellidae), a new species of “pharetronid” sponge from bathyal depths in the northern Porcupine Seabight, NE Atlantic"
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