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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82 Pr<strong>of</strong>essional Paper <strong>NMFS</strong> 12<br />
66. Phorbas paucistylifer Koltun, 1958<br />
Description. This sponge is globular with two distinct<br />
surface morphologies; some specimens are covered with<br />
round, crater-like depressions and round oscula that are<br />
flush with <strong>the</strong> surface, o<strong>the</strong>rs have a surface covered<br />
with short papillae. Dermal membrane is thick. Consistency<br />
is s<strong>of</strong>t and elastic. Diameter is <strong>to</strong> 20 cm. Color in<br />
life is bright orange (dominant phase) or yellow.<br />
Skeletal structure. Aniso<strong>to</strong>rnotes (420–490 × 8–12<br />
µm) with long thin points form a dense ec<strong>to</strong>somal<br />
crust <strong>to</strong>ge<strong>the</strong>r with numerous isochelae. Choanosomal<br />
ascending plumose spicule tracts are <strong>of</strong> <strong>the</strong> same <strong>to</strong>rnotes,<br />
cored and echinated by acanthostyles (280–540<br />
× 10–30 µm). Anchorate isochelae are strongly bent,<br />
<strong>the</strong> outline <strong>of</strong> a half circle and tridentate (32–40 µm).<br />
Koltun (1959) described somewhat smaller <strong>to</strong>rnotes and<br />
acanthostyles.<br />
Zoogeographic distribution. North Pacific Ocean.<br />
Locally common. In Alaska – central Aleutian Islands.<br />
Elsewhere – Sea <strong>of</strong> Okhotsk and Sea <strong>of</strong> Japan.<br />
Habitat. In Alaska – patchily distributed on bedrock<br />
and cobbles at depths between 56 and 120 m. Elsewhere<br />
– reported on rocks and ooze at depths between 3 and<br />
414 m and a temperature <strong>of</strong> 2.3°C.<br />
Remarks. Gross morphology and spicule complement<br />
are similar <strong>to</strong> Lissodendoryx behringi, but <strong>the</strong> spicule architecture<br />
is quite different.<br />
Pho<strong>to</strong>s. 1) Specimen collected at a depth <strong>of</strong> 124 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 in situ with <strong>the</strong> gorgonian<br />
Fanellia compressa. 3) Specimen collected at a depth<br />
<strong>of</strong> 110 m in <strong>the</strong> central Aleutian Islands. Grid marks are<br />
1 cm 2 . 4) Same specimen as in pho<strong>to</strong> 3 in situ.