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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
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| Term | Definition |
| BRANCH (pl. BRANCHIAE) |
The gills; see: GILL for list of the various type of taxonomic groupings. | |
| BRANCHIAL PLUME | [need definition]. In nudibranchs… See illustration: Composite Nudibranch. | |
| BRANCHITELLUM (pl. BRANCHITELLA) |
Point on posteroventral margin of OYSTERS nearest to palliobranchial fusion, commonly forming conspicuously projected posteroventral tip on left valve, especially in sickle-shaped oysters; ABORAL end of GILLS points towards it. | |
| DEMIBRANCH | One of the paired lamellibranch gills. The longitudinal half of a feather-shaped gill; see also: DIBRANCH; TETRABRANCH. | |
| DIBRANCH | Possessing two gills (CTENIDIA); the name applied to all living cephalopods, except Nautilus, which is a TETRABRANCH; see also: EULAMELLIBRANCH; FILIBRANCH; LAMELLIBRANCH; PROTOBRANCH; PSEUDOLAMELLIBRANCH; SEPTIBRANCH; TECTIBRANCH. | |
| EULAMELLIBRANCH | A type of bivalve CTENIDIUM or gill in which [need definition]; see also: DIBRANCH; EULAMELLIBRANCH; FILIBRANCH; LAMELLIBRANCH; PROTOBRANCH; PSEUDOLAMELLIBRANCH; SEPTIBRANCH; TECTIBRANCH; TETRABRANCH. | |
| EXTRA-BRANCHIAL APPENDAGE | [need definition]. In NUDIBRANCHS… See illustration: Composite Nudibranch. | |
| FILIBRANCH | A type of bivalve CTENIDIUM or gill in which [need definition]. The Mytilacea, Pteriacea, Pectinacea, and Anomiacea have filibranch CTENIDIA. See also: DIBRANCH; EULAMELLIBRANCH; LAMELLIBRANCH; PROTOBRANCH; PSEUDOLAMELLIBRANCH; SEPTIBRANCH; TECTIBRANCH; TETRABRANCH. | |
| HYPOBRANCHIAL | Situated below the gills. | |
| HYPOBRANCHIAL GLAND | Large mucous gland beside the rectum ("hypobranchial" is a misnomer) and which consolidates particles before the leave the pallial cavity. | |
| LAMELLIBRANCH | Older name for any BIVALVE having platelike gills. | |
| NUDIBRANCH | [need definition]. See also: ASCOGLOSSAN; SEA SLUG. | |
| OPISTHOBRANCH | Marine Mollusks which are characterised by having a single gill behind and to the right of the heart; they also have a reduced or absent shell and always lack an OPERCULUM. Included in this group are the BUBBLE SHELLS, the NUDIBRANCHS, SEA HARES and SEA BUTTERFLIES. | |
| PROTOBRANCH | [need definition]. | |
| SEPTIBRANCH | [need definition]. | |
| TECTIBRANCH | Molluscs of the order Cephalaspidea, or "BUBBLE SHELLS" usually having a shell present, gills present, head with a tentacular shield, jaws feeble or none, stomach usually with GIZZARD PLATES, and with or without an OPERCULUM. | |
| TETRABRANCH | Possessing four GILLS; that name applied to Nautilus (all other living cephalopods being DIBRANCHS); see also: BRANCH; DEMIBRANCH. | |
| Copyright ©Paul S. Mikkelsen, All Rights Reserved | Return to Home Page | Return to Top | Over 1700 Terms in the Glossary! |