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 ...
- No tags were found...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
108 Pr<strong>of</strong>essional Paper <strong>NMFS</strong> 12<br />
90. Mycale (Mycale) jasoniae Lehnert, S<strong>to</strong>ne and Heimler, 2006<br />
Description. This massive sponge has several large<br />
tubes basally connected. In situ, several exhalent canals<br />
flow in<strong>to</strong> large circular oscula surrounded by thin walls.<br />
These oscula collapse and are not readily visible on collected<br />
specimens. The surface is bulbous with many irregularly<br />
distributed conical processes. The consistency<br />
is ra<strong>the</strong>r s<strong>of</strong>t, easily <strong>to</strong>rn, and fibrous. Diameter is <strong>to</strong> 25<br />
cm. Color in life is yellow <strong>to</strong> light yellow.<br />
Skeletal structure. SEM images <strong>of</strong> spicules are shown<br />
in Appendix IV. The ec<strong>to</strong>some is a tangential arrangement<br />
<strong>of</strong> short spicule tracts and single spicules with<br />
many microscleres in between <strong>the</strong> tracts. The choanosome<br />
consists <strong>of</strong> ra<strong>the</strong>r short spicule tracts (60–95 µm<br />
in diameter) that frequently branch <strong>of</strong>f side tracts in<br />
all directions. This pattern is obscured by <strong>the</strong> presence<br />
<strong>of</strong> many single mega- and microscleres in between <strong>the</strong><br />
tracts and without obvious orientation. Megascleres are<br />
tylostyles (405–460 × 10–12 µm). Microscleres include<br />
large anisochelae (80–100 µm), small anisochelae<br />
(40–60 µm), and rhaphides (42–65 µm).<br />
Zoogeographic distribution. Uncommon. In Alaska<br />
– central Aleutian Islands. Elsewhere – not reported.<br />
Habitat. Attached <strong>to</strong> cobbles at depths between 178<br />
and 340 m.<br />
Remarks. M. jasoniae is quite similar <strong>to</strong> M. loveni but<br />
possesses rhaphides that <strong>the</strong> latter species lacks.<br />
Pho<strong>to</strong>s. 1) Preserved (frozen) specimen collected at<br />
a depth <strong>of</strong> 208 m in <strong>the</strong> central Aleutian Islands. Grid<br />
marks are 1 cm 2 . 2) Same specimen as in pho<strong>to</strong> 1 in situ<br />
with a sculpin (Malacocottus sp.). 3) Close-up <strong>of</strong> same<br />
specimen as in pho<strong>to</strong>s 1 and 2.