A guide to the deep-water sponges of - NMFS Scientific Publications ...
A guide to the deep-water sponges of - NMFS Scientific Publications ...
A guide to the deep-water sponges of - NMFS Scientific Publications ...
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78 Pr<strong>of</strong>essional Paper <strong>NMFS</strong> 12<br />
62. Crella brunnea (Hansen, 1885)<br />
Description. This sponge is polymorphic; may be tabular,<br />
irregularly compressed, occasionally massive-lobate<br />
or markedly lobate with an uneven, corrugated surface.<br />
The dermal membrane is thinly pellicular. Oscula are<br />
not visible on <strong>the</strong> surface. Dimensions are <strong>to</strong> 7 cm. Color<br />
in life is light <strong>to</strong> dark brown.<br />
Skeletal structure. Ec<strong>to</strong>somal <strong>to</strong>rnotes have 2–4<br />
pointed “teeth” at <strong>the</strong> ends (150–290 × 4–7 µm). There<br />
are choanosomal acanthostyles <strong>to</strong> acanthostrongyles<br />
(210–380 × 10–21 µm) and small anchorate isochelae<br />
(23–37 µm). Koltun (1959) additionally reports large<br />
anchorate isochelae (44–84 µm); <strong>the</strong>se were lacking in<br />
specimens we examined from <strong>the</strong> Aleutian Islands.<br />
Zoogeographic distribution. Uncommon. In Alaska –<br />
central Aleutian Islands. Elsewhere – Arctic Ocean (Barents<br />
Sea – White Sea, and Kara Sea) and North Atlantic<br />
Ocean (Norwegian Sea, Denmark Strait, Davis Strait).<br />
Habitat. In Alaska – attached <strong>to</strong> pebbles at a depth <strong>of</strong><br />
190 m. Elsewhere – reported at depths between 20 and<br />
300 m, temperatures <strong>of</strong> 1.5 <strong>to</strong> 4.95°C, and salinities <strong>of</strong><br />
27.68 <strong>to</strong> 35.01 psu.<br />
Pho<strong>to</strong>. 1) Fragmented specimen collected at a depth<br />
<strong>of</strong> 190 m in <strong>the</strong> central Aleutian Islands. Grid marks<br />
are 1 cm 2 .