Definitions

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Mouth

(Taxon-specific: Order Cladocera) Anterior opening of digestive tract under labrum; opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Notostraca) Anterior opening of digestive tract on underside of head; located under labrum and opening into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Diplostraca) Anterior opening of digestive tract; located under labrum and associated with large preoral cavity (atrium oris). Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Anostraca) Anterior opening of digestive tract on underside of head; located under labrum and opening into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Class Cephalocarida) Anterior opening of digestive tract; located under labrum and associated with large preoral cavity (atrium oris). [Stachowitsch, 1992]
(Taxon-specific: Order Cumacea) Anterior opening of digestive tract. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium); opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Tanaidacea) Anterior opening of digestive tract. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium); opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Decapoda) Anterior opening of digestive tract on underside of head; bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium), and flanked by mandibles, maxillules, and maxillae (and to various degrees by maxillipeds). Leads into cardiac stomach via esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Amphipoda) Anterior opening of digestive tract on underside of head. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium); opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Isopoda) Anterior opening of digestive tract on underside of head (cephalon). Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium). [Stachowitsch, 1992]
(Taxon-specific: Order Mysida) Anterior opening of digestive tract. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium). Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Stomatopoda) Anterior opening of digestive tract on underside of head (cephalon); bordered anteriorly by labrum, posteriorly by labrum and mouthparts. Opens directly into stomach. [Stachowitsch, 1992]
(Taxon-specific: Order Leptostraca) Anterior opening of digestive tract on underside of head. Bordered anteriorly by labrum, posteriorly by labium (paragnaths); opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Subclass Branchiura) Anterior opening of digestive tract on underside of cephalothorax; typically enclosed, along with surrounding labrum, mandibles, and paragnaths, in proboscis. Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Subclass Cirripedia) Anterior opening of digestive tract. Closely associated with labrum and mouthparts (trophy). Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Subclass Mystacocarida) Anterior opening of digestive tract. Located under labrum; opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Anterior opening of digestive tract on underside of head. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium), and flanked by mandibles (and to a lesser extent by other mouthparts: maxillules, maxillae, maxillipeds). Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Anterior opening of digestive tract on underside of head. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium), and flanked by mandibles. Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Class Remipedia) Anterior opening of digestive tract on underside of head (cephalon); located in cavity (atrium oris) formed by projecting posterior margin of labrum and by paragnaths. Perioral area highly setose due to setae of labrum and paragnaths. Opens into foregut. [Stachowitsch, 1992]
(Taxon-specific: Superorder Syncarida) Anterior opening of digestive tract. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (paragraphs). Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Thermosbaenacea) Anterior opening of digestive tract. Located on underside of cephalon and bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium). Opens into esophagus. [Stachowitsch, 1992]
(Taxon-specific: Order Euphausiacea) Anterior opening of digestive tract on underside of head. Bordered anteriorly by upper lip (labrum), posteriorly by lower lip (labium); opens into esophagus. [Stachowitsch, 1992]