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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67. Melonanchora globogilva Lehnert, S<strong>to</strong>ne and Heimler, 2006<br />
Description. This sponge is globular. The surface is<br />
covered with numerous thin-walled, bulbous fistules,<br />
4–8 mm high and up <strong>to</strong> 4 mm in width; widest at <strong>the</strong><br />
distal end. The ec<strong>to</strong>some is a translucent white layer, easily<br />
detachable, 400–650 µm thick. Diameter is <strong>to</strong> about<br />
10 cm. Color in life is light yellow with whitish, almost<br />
translucent fistules.<br />
Skeletal structure. SEM images <strong>of</strong> spicules are shown<br />
in Appendix IV. The ec<strong>to</strong>some has smooth tylotes<br />
partially arranged perpendicular <strong>to</strong> <strong>the</strong> surface but<br />
oriented in all directions <strong>to</strong> some degree. From <strong>the</strong><br />
choanosome <strong>the</strong>re are tracts <strong>of</strong> tylotes fanning out <strong>to</strong>wards<br />
<strong>the</strong> ec<strong>to</strong>some. Tylotes with acanthostyles are also<br />
found in <strong>the</strong> choanosome. Tylotes are 640–680 × 10–<br />
12 µm. Choanosomal acanthostyles (660–670 × 20–<br />
30 µm) are singly distributed without recognizable orientation.<br />
Microscleres are three categories <strong>of</strong> isochelae:<br />
large isochelae with fimbriae (65–93 µm), large isochelae<br />
<strong>of</strong> <strong>the</strong> same size but with dented outer margins, and<br />
small anchorate isochelae (23–25 µm).<br />
Zoogeographic distribution. Rare. In Alaska – central<br />
Aleutian Islands. Elsewhere – not reported.<br />
Habitat. Attached <strong>to</strong> pebbles and shell hash at a depth<br />
<strong>of</strong> 173 <strong>to</strong> 190 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) Specimen (indicated by <strong>the</strong> white arrow) observed at<br />
a depth <strong>of</strong> 179 m in <strong>the</strong> central Aleutian Islands.<br />
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