An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
|by Paul S. Mikkelsen|
|AURIFORM||Shaped like a human ear; used in describing the rhinophores of Hermaea spp.; see also: AURICULATE; HALIOTOID.|
|CARDINAL PLATFORM||Shelly internal plate bearing hinge teeth, situated below beak and adjacent parts of dorsal margins and lying in plane parallel to that of commissure; = HINGE PLATE.|
|CORBULIFORM||Shaped like the shells of the bivalve genus Corbula.|
|CORDIFORM||Heart shaped, as in the bivalve Corculum cardissa. See also: CORDATE.|
|CYATHIFORM||Cup-shaped (as in the "cup" of "cup and saucer" limpets, the Calyptraeidae).|
|CYPRAEIFORM||A shape exemplified by the gastropod genus Cypraea. See other gastropod shapes.|
|DENTAL FORMULA||See: RADULA FORMULA.|
|DONACIFORM||A form of TRIGONAL shape exemplified by the BIVALVE genus Donax. See other bivalve shapes.|
|ECOLOGIC FORM||A morphological condition brought about by the influence of the environment, such as long SPINES in quiet waters; also called: ECOTYPE or ECOPHENOTYPE. See also: FORM or FORMA|
|ENSIFORM||An ELONGATE bivalve shape, like an Ensis; with outline resembling a curved sword. See other bivalve shapes.|
|FORM or FORMA||A minor genetic variant, color phase, aberration, or variation due to diet or environment (e.g., an ECOLOGIC FORM); see also: ECOPHENOTYPE; ECOPHENOTYPIC VARIATION; ECOTYPE; VARIETY.|
Spindle-shaped; biconic, i.e., swelling in the central part and tapering at the extremities.
See other gastropod shapes.
|HAMIFORM||Curved at the extremity; see also: FLEXUOUS; RECURVED; REFLECTED.|
|HELICIFORM||Shaped like shells of the genus Helix. See also: ESCARGOT. See other gastropod shapes.|
|INFUNDIBULIFORM||Funnel-shaped, as in the siphon or funnel of a CEPHALOPOD.|
|LIMACIFORM||[need definition]; used by Abbott, 1974 (pg. 367) in description of Dendronotus.|
|LINGUIFORM||Tongue-shaped. See also: ELONGATE|
|MODIOLIFORM||Shaped like the shell of Modiolus spp.; differing from MYTILIFORM in that the BEAKS are not quite terminal and ANTEROVENTRAL region forms slight bulge.|
|MONILIFORM||Composed of a row of beads, like a necklace; see also: BEADED.|
|MUSCLE SCAR, CRUCIFORM||[need definition].|
Shaped like the shell of the genus Mytilus. See other bivalve shapes.
Photo: Modiolus modiolus (Linne, 1758)
|NERITIFORM||A GLOBOSE GASTROPOD shape resembling that of a Nerite snail (e.g., Nerita spp.; Neritina spp.): with few subglobose and rapidly enlarging whorls with a very reduced SPIRE. See other gastropod shapes.|
|NUCULANIFORM||A shape exemplified by the bivalve genus Nuculana; = ROSTRATE. See other bivalve shapes.|
|PATELLIFORM||Shaped like a human knee cap or patella; = PATELLATE. See other gastropod shapes.|
Photo: Argopecten irradians concentricus (Say, 1822)
A shape exemplified by the bivalve genus Pteria. See other bivalve shapes.
Photo: Pteria colymbus (Roding, 1798)
|PUPIFORM||Shaped like members of the genus Pupilla [Pupillidae]. See other gastropod shapes.|
|PYRIFORM||Shaped like a pear.|
A series of numbers indicating the number of MARGINAL TEETH, LATERAL TEETH and the RACHIDIAN TOOTH, and (again) the lateral teeth and marginals.
Example: a formula of 3+6+R+6+3 indicates 3 marginal teeth, 6 lateral teeth and 1 rachidian (R) tooth. The radula formula may be simply "1" if the radula is UNISERIATE, having only rachidian teeth. See also: DOCOGLOSSATE; STENOGLOSSATE; RHIPIDOOGLOSSATE; TAENIOGLOSSATE; TOXOGLOSSATE.
See the excellent illustrations on Wikipedia.
|RENIFORM||Shaped like a kidney (e.g., the aperture of Ampullaria spp.).|
|SCALARIFORM||Loosely coiled; see also: TIGHTLY COILED.|
A shape exemplified by the SHIPWORM bivalve genus Teredo. See other bivalve shapes.
Illustration: Teredo sp. (left = entire animal; center = PALLETS; right = shell)
|TRAPEZIFORM||With four straight sides, only two of which are parallel; see also: POLYGONAL; QUADRATE.|
|Having the form of a top; conical, with the base of the cone at the APERTURE; see also: TURBINATE. See other gastropod shapes.|
|TURRIFORM||Tower-shaped; = TURRICULATE. See other gastropod shapes.|
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