Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

162Maggenti and Gardnerinto which the esophagus opens, sometimes differentiatedinto gizzard and stomach. 3. (NEMATA) The esophago-intestinalvalve.cardiac a. [Gr. kardia, heart] Pertaining to or near the heart.cardiac notch or incision (ARTHRO: Crustacea) Indentation onthe posterior margin of a carapace.cardiac pyloric valve (ARTHRO: Crustacea) In Decapoda, acalcified triangular plate that may be flat or curved, generallycovered with elongate setae pointing backwards, orcovered by a thick corrugated layer of pigmented chitin;functioning as a guard to the pyloric opening.cardiac region (ARTHRO: Crustacea) In Decapoda, the medianpart posterior to the cervical groove, between the urogastricand intestinal regions.cardiac sinus (ARTHRO) The dorsal part of the embryonichemocoel of certain arthropods, that corresponds to a circulatorysystem, a part of which becomes the lumen of thedorsal blood vessel.cardiac sphincter (ARTHRO: Insecta) Circular muscles at theentrance to the midgut of certain insects; cardiac valve;stomodeal valve.cardiac stomach 1. (ARTHRO: Crustacea) In Decapoda, theanterior portion of the stomach. 2. (BRYO: Phylactolaemata)That part of the stomach between the cardiac valve andcaecum. 3. (ECHINOD: Asteroidea) The large, loosely foldedadoral stomach of a sea star, that is capable of beingeverted when feeding.cardiac tooth (ARTHRO: Insecta) In Decapoda, a tooth on themid-line of a carapace just posterior to the cervical groove.cardiac valve 1. A valve at the junction of the foregut andmidgut of many invertebrates. 2. (NEMATA) see cardia.cardiform a. [Gr. kardia, heart; L. forma, shape] Resemblingthe shape of a heart.cardinal a. [L. cardo, hinge] 1. (ARTHRO: Insecta) Referring tothe cardo. 2. (MOLL: Bivalvia) Applied to the central or principalteeth in the hinge of a shell.cardinal area 1. (BRACHIO) The posterior sector of the articu-