Species Overview

Hymedesmia (Stylopus) 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

Surface:

Texture: Superficially smooth to somewhat granular soft slippery

Megasclere:

Shape: Acanthostyles (may include a few styles)
Length: 211 -(272|285)- 318 µ
Width: 9 -(10|11)- 14 µ

Megasclere:

Shape: Subtylotes
Length: 213 -(234|240)- 260 µ
Width: 5 -(6|7)- 8 µ

Megasclere:

Shape: Styles - Subtylostyles
Length: 199 -- 248 µ
Width: 2 -- 3 µ

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 µ
Width: 4 -(5|6)- 7 µ

Megasclere:

Shape: Tylotes - Subtylotes
Length: 96 -(136|154) - 169 µ
Width: 1 -(2.0|2.5)- 3 µ