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Crayfish
Key definitions
| Question | Answer |
|---|---|
| Crayfish | Phylum: Arthropoda Class: Crustacea |
| Cephalothorax | Composed of the somites of the head and those of the thorax fused together |
| Carapace | exoskeleton that covers the cephalothorax dorsally and laterally |
| Rostrum | anterior extension of the carapace |
| Biramous | two-branched appendages |
| Caudal Fin | uropods of the two sides fit together with the telson// powerful backward propulsion in water |
| Pleopods | appendages of the abdomen// simmerets |
| Males | first pleopods are hardened// sperm delivery |
| Females | first pleopod is much shorter (uniramous) |
| Oviduct Openings | ventral surface of the basal segments of the 3rd pereiopods// allow for sexual reproduction |
| Pereiopods | walking legs |
| Cheliped | first pereiopd- more powerful than other ones |
| Maxillipeds | sensing, masticating, and manipulating food towards mouth |
| Maxillae | anterior to the maxillipeds// 1st: pushes food forward to mandibles/ 2nd: paddle to bail water from gill chambers |
| Mandibles | hard, toothed |
| Antennae/ Antennules | biramous |
| Compound Eyes | borne upon the motile stalks |
| External opening of the green glands | basal segment of each antenna |
| Stacyst | too small to see// equilibrium |
| Gill Chambers | feathery structures on each side of cephalothorax// oxygen transfer |
| Gills | Spongy |
| Epipodites | respiration and holds up the gills |
| Hypodermis | thin subject membrane |
| Pericardial cavity | triangular area behind the stomach |
| Digestive Gland | between pericardial cavity and the stomach |
| Mandibular Muscles | roots are fastened hypodermis |
| Esophagus | leads from mouth to stomach |
| Stomach | composed of cardiac stomach, gastric mill, and pyloric stomach |
| Cardiac Stomach | larger anterior chamber of stomach |
| Gastric Mill | hardened teeth// grinds food into smaller particles |
| Pyloric Stomach | funnel-shaped chamber posterior to gastric mill// lined by fine bristles to strain the food mixture and filters out larger food particles |
| Digestive Glands | pair of very large yellowish glands mainly in the cephalothorax// sends digestive secretions to intestine |
| intestine | runs form stomach to anus// digestion and absorption |
| Open Circulatory System | yes |
| Heart | lies in the pericardial cavity |
| Pericardial Cavity | fills with blood draining there from the gills |
| Ostia | openings in the heart that blood flows through |
| Green Glands | anterior part of cephalothorax// excretory glands |
Created by:
nwmoser
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