Species Overview

019
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Hymedesmia (Stylopus) arndti (de Laubenfels, 1930)

Synonyms:
Astylinifer arndti de Laubenfels, 1930.

SPONGE:
Shape: Thin encrusting Often takes the form of the substrate on which it is found
Size_Thickness: -- 2 mm
Color_Alive: Ochre-yellow
Consistency: Moderately firm
HABITAT:
Benthic Region: Marine: Intertidal to Subtidal
Depth: 0--10 m
Distribution: California

CHARACTERS

Surface:
Texture: Superficially smooth to somewhat granular soft slippery
Megasclere:
Shape: Acanthostyles (may include a few styles)
Length: 211 -(272|285)- 318 Ám
Width: 9 -(10|11)- 14 Ám
Megasclere:
Shape: Subtylotes
Length: 213 -(234|240)- 260 Ám
Width: 5 -(6|7)- 8 Ám
Megasclere:
Shape: Styles - Subtylostyles
Length: 199 -- 248 Ám
Width: 2 -- 3 Ám
Skeleton:
Composition: Silicate
Architecture: Modified Hymedesmoid
Oscula:
Visible: Not evident
Skeleton:
Architecture: Acanthostyles with heads embedded in thick basal layer of spongin are perpendicular rising to surface
Tracts: Thick tracts of Tylotes to Subtylotes extending to surface. These also often curve and may end up parallel to surface
Megasclere:
Shape: Acanthostyles
Length: 72 -(94|103)- 157 Ám
Width: 4 -(5|6)- 7 Ám
Megasclere:
Shape: Tylotes - Subtylotes
Length: 96 -(136|154) - 169 Ám
Width: 1 -(2.0|2.5)- 3 Ám