THE BIOLOGY O F WOOD-BORING TEREDINID MOLLUSCS
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EC
PAR
I
EC
-M
/a
2
EC
iBV -
7 'MGR
4
ABV
6
FIG. 20. The gills of shipworms. Sections of shipworms taken towards the posterior
part of the body beyond the caecum through the gills (ctenidia). Note the nature
and extent of the gills in the different genera. ( 1 ) Bankia go&; (after Sigerfoos,
1908) ; (2) B. ircdica (after Nair, 1965) ; (3) Teredo navalis (after Ridewood, 1903) ;
(4) Nausitora hedleyi (after Saraswathy and Nair, 1971) ; (5) Psredoficrcifera (after
Saraswathy and Nair, 1971) ; (6) Teredora princesae (after Saraswathy and Nair
1971). AAF, Ascending arm of filament; ABV, afferent branchial vein; ARV,
afferent renal vein ; CABV, common afferent branchial vein; CMT, ciliated mantle
tract; DAF, descendmg arm of filament; EBV, efferent branchial vein; EC, epibranchid (exhalant) cavity ; G, gill ; GC, gland cells; GDS, glands of Deshayes ;
IBC, infra-branchial (exhalant) cavity ; ILJ, interlamellar junction; MA, mantle ;
MG, mantle groove; MGR, branchial or food groove; PAR, pallial artery; PAS,
stalk of the pallet.
median line (Ridewood, 1903). The shape and length of the gills in
several species have been described by Turner (1966). I n Bactronophorus the descending limb of each lamella is nearly straight while the
ascending limb extends laterally before bending upward forming a
U-shaped lamella. In Neoteredo the broad and flat gills form little more