[A]
Microdiscohexasters are common.
Discoctaster terminals are straight. |
| | Rhabdocalyptus dawsoni
(Lambe, 1893) |
Sponge:
Straight or curved tube or sac; veil of Diactins and Pentactins.
Color: Light yellowish grey in alcohol.
Spicules: Megascleres:
(1) Principal Diactins:
4.2 -6.6- 11.4 mm.
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(2) Thick Prostal Diactins:
to 6 cm.
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(3) Short Diactins:
0.35 -0.78- 1.62 mm.
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(4) Thorned Hypodermal Pentactins (tangential ray):
0.9 -2.6- 4.1 mm.
(proximal ray): 4.8 -6.6- 8.8 mm.
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Mesoscleres:
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(1) Dermal Stauractins (ray):
50 -77- 101 um.
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(2) Dermal Pentactins (tangential ray):
54 -77- 99 um.
(proximal ray): 44 -73- 100 um.
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(3) Gastral Hexactins (ray):
55 -105- 177 um.
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Microscleres:
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(1) Oxy-hemihexasters (diameter):
48 -83- 104 um.
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(2) Discoctasters (diameter):
56 -66- 82 um.
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(3) Microdiscohexasters (diameter):
17 -21- 28 um.
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Skeleton:
Composed entirely of loose spicules.
Distribution: Southern and Northern California.
Depth: Deep water.
Note: Data mostly from Syntype CMN 1900-2811;
Prostal Diactin length from Lambe, 1892. Reported to slough outer veil of spicules in winter. Tabachnick's 2002 proposed move of Rhabdocalyptus to a subgenus of Acanthascus is not followed here.
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[B]
Microdiscohexasters are NOT present.
Discoctaster terminals are strongly curved resulting in flared terminal bundles.
|
| | Rhabdocalyptus tener
Schulze, 1899 |
Sponge:
Known only from incomplete lower part; probably tube or sac-shaped.
Color: Not reported.
Spicules: Megascleres:
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(1)Principal Diactins:
3.2 -7.3- 13.1 mm.
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(2)Thick Prostal Diactins:
to 2.1 cm.
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(3)Short Diactins:
0.60 -1.37- 2.92 mm.
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(4)Thorned Hypodermal Pentactins (tangential ray):
1.6 -2.6- 4.1 mm.
(proximal ray): 5.2 -5.8- 7.6 mm.
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Mesoscleres:
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(1) Dermal Stauractins (ray):
Length-ray 61 -89- 137 um.
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(2) Dermal Pentactins (tangential ray):
68 -103- 130 um.
(proximal ray): 76 -112- 149 um.
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(3) Gastral Hexactins (ray):
87 -157- 252 um.
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Microscleres:
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(1)Oxyhexactins (diameter):
68 -86- 104 um.
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(2)Oxyhexasters and Oxyhemihexasters (diameter):
62 -84- 119 um.
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(3)Discoctaster (diameter):
71 -85- 110 um.
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Skeleton:
Composed entirely of loose spicules.
Distribution: Southern California.
Depth: Deep water.
Note: Data from Holotype USNM 7577. See note above.
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