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  • noun

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comb-like respiratory structure serving as the gill of certain mollusks

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Tip of male fixed cheliceral finger rounded, tapering anteriorally, palpal tarsus dark for at least the distal half, metatarsus dark 80% apically, dusky creamy orange chelicera, dark to dusky light orange propeltidium; ctenidia short (about half the succeeding segment), pointed.
Abdomen: 2 short, pointed ctenidia ventrally on fourth abdominal sternite (Fig.
Furthermore, feeding studies with the blue mussel (Mytilus edulis Linnaeus, 1758) indicate that high algal concentrations can severely overload the ctenidia and reduce filtration rates (Riisgard et al.
Three 2-3-mm cross-sections were excised from each animal to obtain tissues from the following organs: siphon, ctenidia, labial palps, mantle, heart, digestive organs, and gonad.
The most common geoduck parasites observed on histological examination included an RLO in the ctenidia (39%; Fig.
From the Spanish for trowel, paleta, which refers to the shape of the four ctenidia.
The four trowel-shaped ctenidia as well as the combination of coloration and "crimped" male fixed finger distinguishes it from other members of the Eremobates scaber group.
Ctenidia were squash mounted and examined under 100X magnification light microscopy (Morton 1977, Britton & Morton 1982).
pansa is an antero-posteriorly elongated organ located on the internal surface area of the mantle, that folds on its posterior side near the rectum, right of the ctenidia and anterior to the kidney.
Tissues containing mantle, ctenidia, labial palps and digestive system infected with sporocysts was immediately fixed in Davidson fixative prepared with seawater.
Concerning the mechanisms underlying the increased presence of dinoflagellates and chloropyta within the stomach contents of mussels from both populations, two hypothesis are at least possible: (1) these microalgae could be ingested in preference to diatoms through the differential retention in the ctenidia and/or selection during the pseudofeces forming process; (2) they would be far more resistant to extracellular digestion remaining longer within the gut and being preferentially voided with the feces.
3] samples of siphon and ctenidia tissues were collected and cryogenically preserved at -80[degrees]C, and foot tissues were divided into 0.
Gametes of brood oysters are fertilized at the ctenidia, and the embryos are released into the branchial chamber of females.
Metamorphosis is an energetically demanding process, and after the loss of the larval velum there is a cessation of filter-feeding capability until the postlarval ctenidia become functional (Bayne 1965, Hodgson & Burke 1988, Sastry 1965).