A guide to the deep-water sponges of - NMFS Scientific Publications ...

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80 Professional Paper NMFS 12 64. Hymedesmia (Hymedesmia) irregularis Lundbeck, 1910 Description. This sponge is thinly encrusting with a smooth or partially hispid surface. According to Koltun (1959) there are oscula atop broad papillae. Color in life is greyish yellow or bluish white. Skeletal structure. There are acanthostyles (125–540 × 16–32 µm). Ectosomal spicules are polytylote strongyles (280–410 × 6–10 µm) tangentially arranged in bundles. Microscleres are arcuate isochelae (32–48 µm). Zoogeographic distribution. Widespread but uncommon. In Alaska – Bering Sea (Pribilof Canyon). Elsewhere – Arctic Ocean (White Sea) and North Atlantic Ocean (Davis Strait, Denmark Strait, southwest of Iceland near the Faroe Islands). Habitat. In Alaska – grows on boulders and cobbles at depths around 300 m. Elsewhere – reported at depths between 293 and 1441 m. Photo. 1) Fragments of a preserved (frozen and then stored in ethanol) specimen collected at a depth of 300 m in Pribilof Canyon, Bering Sea.
65. Kirkpatrickia borealis Koltun, 1970 Description. In situ this species has a globular body covered with numerous papillae and possesses large circular oscula. On deck specimens typically collapse completely and appear to be irregularly massive-lobate without papillae and oscula. Surface is smooth and covered by a thin ectosomal membrane. Circular oscula on the surface are slightly elevated and close upon collection. The consistency is elastic and compressible. Diameter is to 10 cm. Color in life is yellow, orange, or golden brown. Skeletal structure. There are ectosomal tylotes (350– 440 × 4–7 µm); choanosomal styles include a few strongyles (470–680 × 15–22 µm). Zoogeographic distribution. Locally common. In Alaska – central Aleutian Islands. Elsewhere – Northwest Pacific Ocean (previously known only from off Shikotan Island, Kuril Islands). Habitat. In Alaska – attached to boulders and cobbles at depths between 82 and 426 m. Elsewhere – reported at depths between 472 and 479 m. Remarks. K. borealis is similar to Inflatella globosa but is irregularly massive with relatively inconspicuous oscules, while the latter species is more globular with oscules on top of small papillae. Also, K. borealis has tylotes, styles, and a few strongyles while I. globosa has tylotes only. Photos. 1) Collapsed specimen collected at a depth of 146 m in the central Aleutian Islands. Grid marks are 1 cm 2 . 2) Same specimen as in photo 1 in situ. 81
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CONTENTS Introduction . . . . . . .
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CONTENTS (continued) 75. Tedania (T
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2 Professional Paper NMFS 12 larly
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4 Professional Paper NMFS 12 Figure
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8 Professional Paper NMFS 12 Bering
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11 CLASS CALCAREA
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2. Leucandra poculiformis Hozawa, 1
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15 CLASS HEXACTINELLIDA
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5. Farrea occa occa Bowerbank, 1862
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7. Family Euretidae; Genus nov., sp
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9. Aphrocallistes vastus Schulze, 1
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10. Heterochone calyx calyx Schulze
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11. Regadrella okinoseana Ijima, 18
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13. Acanthascus (Rhabdocalyptus) da
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