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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126 Pr<strong>of</strong>essional Paper <strong>NMFS</strong> 12<br />
105. Cladocroce ventilabrum (Fristedt, 1887)<br />
Description. Two growth forms exist: 1) massive <strong>to</strong><br />
hemispherical, and 2) fan-shaped and stalked. The fan<br />
may be thin-bladed or form an ovoid tube with a large<br />
osculum on <strong>to</strong>p. The surface is irregularly corrugated<br />
with crater-like oscula. Both growth forms narrow somewhat<br />
<strong>to</strong> a basal attachment or short stalk. Consistency<br />
is s<strong>of</strong>t, elastic, and easily <strong>to</strong>rn. Size is <strong>to</strong> 10 cm × 10 cm.<br />
Color in life is reddish brown or golden brown.<br />
Skeletal structure. There is an ec<strong>to</strong>somal unispicular<br />
reticulation <strong>of</strong> tangentially arranged oxeas (160–180 ×<br />
5–12 µm). Where oxeas are connected, one <strong>to</strong> four are<br />
arranged perpendicular <strong>to</strong> <strong>the</strong> surface. There is a choanosomal<br />
unispicular reticulation; in places paucispicular<br />
tracts are connected by single spicules.<br />
Zoogeographic distribution. Widespread but uncommon.<br />
In Alaska – central Aleutian Islands. Elsewhere<br />
– North Pacific Ocean (Sea <strong>of</strong> Japan), Arctic Ocean<br />
(Barents Sea and Greenland Sea), and North Atlantic<br />
Ocean (Davis Strait).<br />
Habitat. In Alaska – attached <strong>to</strong> cobbles, pebbles,<br />
and bivalve shells at depths between 155 and 235 m.<br />
Elsewhere – reported at depths between 40 and 718 m.<br />
Pho<strong>to</strong>s. 1) Specimen collected at a depth <strong>of</strong> 190 m<br />
in <strong>the</strong> central Aleutian Islands. Grid marks are 1 cm 2 .<br />
2) Same specimen as in pho<strong>to</strong> 1 (center) in situ.<br />
3) Specimen attached <strong>to</strong> a scallop shell (Chlamys sp.)<br />
collected at a depth <strong>of</strong> 155 m in <strong>the</strong> central Aleutian<br />
Islands. Grid marks are 1 cm 2 . 4) Specimen attached<br />
<strong>to</strong> a pebble collected at a depth <strong>of</strong> 155 m in <strong>the</strong> central<br />
Aleutian Islands. Grid marks are 1 cm 2 .