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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59. Monanchora alaskensis (Lambe, 1895)<br />
Description. This stalked sponge widens from a<br />
relatively narrow peduncle <strong>to</strong> <strong>the</strong> appearance <strong>of</strong> many<br />
agglutinated tubes (up <strong>to</strong> eight tubes). Growth form<br />
may also be flabellate, dactylate, or irregularly lobate<br />
(Koltun, 1959). Surface is smooth; large oscula are arranged<br />
in rows on <strong>the</strong> apical surface. The consistency<br />
is elastic and compressible but difficult <strong>to</strong> tear due <strong>to</strong><br />
<strong>the</strong> polyspicular tracts <strong>of</strong> <strong>the</strong> choanosome. Height is <strong>to</strong><br />
at least 17 cm. Color in life is golden brown <strong>to</strong> brown.<br />
Skeletal structure. There are ec<strong>to</strong>somal thin styles<br />
(120–200 × 7–9 µm), choanosomal styles (180–360 ×<br />
13–20 µm) that form an irregular meshwork <strong>of</strong> polyspicular<br />
tracts, anchorate isochelae (70–90 µm), and<br />
small isochelae (30–40 µm).<br />
Zoogeographic distribution. Widespread but uncommon<br />
in <strong>the</strong> North Pacific Ocean. In Alaska – central<br />
Aleutian Islands and Bering Sea. Elsewhere – Bering Sea<br />
(Russia) and Sea <strong>of</strong> Okhotsk.<br />
Habitat. In Alaska – attached <strong>to</strong> bedrock and cobbles<br />
at depths between 146 and 364 m. Elsewhere – on peb-<br />
bles, rocks, and sand at depths between 32 and 148 m<br />
and temperatures <strong>of</strong> 1.4 <strong>to</strong> 6.5°C.<br />
Pho<strong>to</strong>. 1) Specimen collected at a depth <strong>of</strong> 146 m in<br />
<strong>the</strong> central Aleutian Islands. Grid marks are 1 cm 2 .<br />
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