What is a scaphognathite?

: a thin leaflike appendage of the second maxilla of decapod crustaceans.

What are gill bailers used for?

Gill bailer Leaf-like flap in a channel at the anterior opening of each branchial chamber in decapod crustaceans; by its beating, drives water forward in and out of the branchial chamber.

What is a gill bailer?

: a flat membranaceous expansion of the second maxilla in the crayfish and other decapod crustaceans by which water is scooped out of the gill cavity. — called also gill scoop.

What is the function of the Scaphognathite?

(Zool.) A thin leafike appendage (the exopodite) of the second maxilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity.

What type of gill is characteristic of crabs?

Aquatic arthropods usually have gills which are in most cases modified appendages. In some crustaceans these are exposed directly to the water, while in others, they are protected inside a gill chamber. Horseshoe crabs have book gills which are external flaps, each with many thin leaf-like membranes.

What are the basic Tagmata of decapod crustaceans?

Crustaceans are usually segmented with one pair of appendages per segment. Segments are arranged into distinct tagmata (regions that are speciallized for specific purposes) such as the cephalon (head, cephalic = adjective), thorax (thoracic = adjective), and abdomen.

Why is a crayfish classified as a decapod?

The presence of five pairs of thoracic legs (pereiopods) is the basis for the name decapod (from the Greek meaning “10 legs”). Members of the order exhibit great diversity in size and structure.

What is prawn Scaphognathite?

A thin leafike appendage (the exopodite) of the second maxilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity.

Are crabs Stenohaline?

The blue crab and the Chinese crab, when in fresh water, maintain a hemolymph-water osmotic gradient of 600 mOsm or greater (see above). Many of these species are actually quite stenohaline and are restricted to fresh water or water of very low salinity.

Are crabs Osmoregulators?

In freshwater they are osmoregulators, while marine species are typically osmoconformers. Four species of decapod crustaceans (the marine osmoconformer crab Hepatus pudibundus, and three osmoregulators of different habitats) have been exposed in vivo to a salinity challenge, for up to 24 hr.

Do crustaceans have blood?

Crustaceans have an open circulatory system meaning that all their blood is not contained within vessels, instead, blood is drawn in to the heart through holes called ostia, then pumped out again to circulate through the tissues and return again to the heart.

Do crustaceans have a complete gut?

The digestive tract of crustaceans is more often very simple and rectilinear. Mastication takes places mostly place mostly in the stomach and absorption takes place in the tubules of the hepatopancreas.

What is the purpose of the scaphognathite appendage?

1. (Zool.) A thin leafike appendage (the exopodite) of the second maxilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster’s page for free fun content . References in periodicals archive ?

What kind of margin does scaphognathite exopod have?

Exopod ( scaphognathite) margin with 4 plumose setae and a setose posterior stout process. 3) and may be linked to episodic reversal or cessation of scaphognathite (gill-pump) beating common in marine crustaceans (Taylor, 1982).

Where was the settlement of the scaphognathite found?

Settlement was also recorded on the different part of the body like (hypobranchial gill rake, epibranchial gill rake, and scaphognathite) and the inner wall of the branchial chambers.

How many scaphognathite spines are on the maxilla?

The morphological characters of the first postlarva are 43 scaphognathite setae on the maxilla, three scaphocerite spines on the outer margin of antenna, and sternal plate spines: 2,2,0,1,1.