- ventral nerve cord
- Ganglia or connectives in somites joined by single or double tract of nerve fibers running longitudinally beneath alimentary canal [McLaughlin, 1980].(Order Cladocera):Pair of widely separated, longitudinal nerve cords extending into trunk from posterior part of brain; forms ladder-like chain with relatively few, occasionally fused ganglia [Stachowitsch, 1992].(Order Notostraca):Pair of widely separated longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain (with series of ganglia) [Stachowitsch, 1992].(Order Diplostraca):Pair of widely separated, longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain [Stachowitsch, 1992].(Order Anostraca):Pair of widely separated, longitudinal nerve cords originating from posterior part (tritocerebrum) of brain and forming ladder-like chain (with series of ganglia) extending to second abdominal somite [Stachowitsch, 1992].(Class Cephalocarida):Pair of longitudinal nerve cords extending from subesophageal ganglia to end of abdomen; bears pair of ganglia in each somite [Stachowitsch, 1992].(Order Cumacea):Longitudinal nerve cord extending posteriorly from brain (supraesophageal ganglion). Located below digestive tract; bears 16 pairs of segmentally arranged ganglia [Stachowitsch, 1992].(Order Decapoda):Longitudinal pair of more or less fused nerve cords extending from subesophageal ganglion to telson. Basically bears pair of (fused) ganglia in each somite [Stachowitsch, 1992].(Order Amphipoda):Longitudinal nerve cord extending below digestive tract from subesophageal ganglion to end of abdomen. Bears series of segmentally arranged (posteriorly occasionally fused) ganglia [Stachowitsch, 1992].(Order Isopoda):Longitudinal nerve cord extending below digestive tract from subesophageal ganglion into abdomen. Bears series of segmentally arranged ganglia (anteriorly displaced in pleon) [Stachowitsch, 1992].(Order Mysida):Longitudinal nerve cord extending below digestive tract to last abdominal somite. Extends posteriorly from subesophageal ganglion or directly from supraesophageal ganglion via esophageal connectives. Bears series of segmental ganglia [Stachowitsch, 1992].(Order Stomatopoda):Longitudinal pair of fused nerve cords extending from postoral ganglion to posterior end of body; located midventrally and bearing ganglia (segmental ganglia) in each somite [Stachowitsch, 1992].(Order Leptostraca):Longitudinal nerve cord extending below digestive tract to sixth abdominal somite (next to last somite). Joined to brain (supraesophageal ganglion) by pair of esophageal connectives; bears series of segmentally arranged ganglia [Stachowitsch, 1992].(Subclass Cirripedia):Pair of nerve cords extending posteriorly from subesophageal ganglion. Ganglia of ventral nerve cord may be fused with subesophageal ganglion to form large ventral nerve mass [Stachowitsch, 1992].(Subclass Mystacocarida):Pair of longitudinal nerve cords extending from brain to posterior end of body; bears series of ganglia. (Syn. ventral nerve chain) [Stachowitsch, 1992].(Class Ostracoda):Paired, longitudinal nerve cord extending through trunk; bears pair of ganglia near base of appendages. Typically more or less concentrated and forming, along with subesophageal ganglion, posterior part of circumesophageal nerve ring [Stachowitsch, 1992].(Class Ostracoda):Unpaired, longitudinal nerve cord extending through thorax and joined to supraesophageal ganglion by pair of circumesophageal connectives. May be concentrated anteriorly in parasitic copepod, leading to prominent nerve ring around esophagus [Stachowitsch, 1992].(Class Remipedia):Pair of longitudinal nerve cords extending from circumesophageal connectives to posterior end of body; connected to eachoth via commissures and bearing only modestly developed trunk-segment ganglia [Stachowitsch, 1992].(Superorder Syncarida):In anaspidacean, longitudinal nerve cord extending below digestive tract to end of abdomen. Band-shaped, bearing series of segmental ganglia. Connected anteriorly to supraesophageal ganglion by pair of esophageal connectives [Stachowitsch, 1992].(Order Thermosbaenacea):Longitudinal nerve cord extending posteriorly from brain. Located below digestive tract; bears segmentally arranged ganglion pairs [Stachowitsch, 1992].(Order Euphausiacea):Longitudinal nerve cord extending below digestive tract to last (sixth) abdominal somite. Joined to brain (supraesophageal ganglion) by pair of esophageal connectives; bears series of segmentally arranged ganglia [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.