Quantcast Table 4-4 Comparison of Characteristics of Marine Borers

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Sphaeroma
Limnoria (Gribbles)
Characteristics
Teredo (Shipworms) Bankia (Shipworms)
Martesia (Pholads)
see Limnoria
louse like
clam like
Appearance
worm like
see Teredo
length 3/8-1/2 in.
length 1/8-1/4 in.
length 2 1/2 in.
Borer size
length 1-2 ft.
length 5-6 ft.
width 1/4 in.
1/3 as wide
diameter 1 in.
diameter 1/2 in.
diameter 7/8 in
Burrows typically
Surface severely
Entrance hole 1/4"
Damage
entrance hole 1/16"
see Teredo
1/4 in. in diameter
honeycombed, early-
diameter; damage close
diameter; surface
and about 3 times
wood preferred; holes
to surface; 2-2 1/2 in.
damage minimal;
as deep, and
1/6 in. diameter by
deep and 1 in. in
subsurface severely
perpendicular to
1/2 in. deep; wave
diameter
honeycombed; holes
the surface.
action erodes pile
lined with shelly
surface to hourglass
calcareous deposits
shape
Area commonly
see Limnoria
between half and low
--
attacked
mud line
see Teredo
tide, mud line





 


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