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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95. Latrunculia sp. (undescribed)<br />
Description. This globular sponge has broad cratershaped<br />
pore fields; <strong>the</strong>se are prominent structures<br />
on <strong>the</strong> sponge surface. Surface is uneven and slimy.<br />
Diameter is <strong>to</strong> about 8 cm. Color in life is khaki-green<br />
<strong>to</strong> olive-green.<br />
Skeletal structure. The majority <strong>of</strong> megascleres are<br />
anisostyles, fusiform, not terminally spined, rarely<br />
polytylote, with only slight differentiation between<br />
<strong>the</strong> two ends (325–397 × 7–10 µm). Microscleres are<br />
anisodiscorhabds (49–66 × 4–7 µm). The manubrium,<br />
a base <strong>of</strong> six short, downward pointing smooth spines,<br />
is closely followed by <strong>the</strong> basal whorl, which consists <strong>of</strong><br />
a ring <strong>of</strong> horizontally aligned, smooth spines. The median<br />
whorl (21–31 µm in diameter) is located midway<br />
along <strong>the</strong> shaft and composed <strong>of</strong> undulate petals with<br />
denticulate margins, and some sculpted regions. The<br />
subsidiary whorl is composed <strong>of</strong> similar undulating petals<br />
with denticulate margins and sculpted sections, but<br />
<strong>the</strong> petals slant upwards and are located just underneath<br />
<strong>the</strong> apical whorl. The apical whorl is formed <strong>of</strong> fused<br />
undulating petals with denticulate margins forming a<br />
beautiful corona.<br />
Zoogeographic distribution. Locally abundant. In<br />
Alaska – continental shelf <strong>of</strong>f Cape Ommaney, Baran<strong>of</strong><br />
Island, eastern Gulf <strong>of</strong> Alaska. Elsewhere – a sponge,<br />
believed <strong>to</strong> be this species, has also been reported from<br />
British Columbia and nor<strong>the</strong>rn Washing<strong>to</strong>n State.<br />
Habitat. In Alaska – attached <strong>to</strong> bedrock at depths<br />
between 69 and 210 m, temperatures between 5.5 and<br />
7.6°C, and salinities between 32.2 and 33.7 psu. Elsewhere<br />
– no information available.<br />
Pho<strong>to</strong>s. 1) Specimen collected at a depth <strong>of</strong> 102 m<br />
in <strong>the</strong> eastern Gulf <strong>of</strong> Alaska. Grid marks are 1 cm 2 .<br />
2) Same specimen as in pho<strong>to</strong> 1 in situ with <strong>the</strong> hydrocoral<br />
Distichopora borealis (right).<br />
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