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Sand shrimp

Scientific Name
Crangon uritai
Scientific Author
Hayashi and Kim, 1999
Taxonomy
(Decapoda: Caridea: Crangonidae)
Status
Exotic Species Establishment in Australia
Reliability
High
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Diagnostic Images (5)
Diagnostic Notes
In May 2008, three specimens of the crangonid sand shrimp species Crangon uritai Hayashi and Kim, 1999 were recorded from the muddy intertidal zone of Newport in Port Phillip Bay, Victoria. The discovery of the species in the bay is the first record of the genus Crangon from Australian waters and the first report of the East Asian coastal species Crangon uritai from the Southern Hemisphere.

Diagnosis

Rostrum only reaching to midlength of eyes, about 0.15 of carapace length, narrowing distally to rounded apex; carapace with median gastric spine arising from anterior about 0.20 of carapace length; hepatic spine arising slightly anterior to median gastric spine; hepatic groove distinct; antennal spine slightly falling short of or reaching rostral distal margin; branchiostegal spine reaching to level of distal corneal margin; orbital margin with distinct cleft; longitudinal suture extending from base of antennal spine to midlength of carapace.

Thoracic sternum nearly flat, not depressed below; sternite 5 with short median spine only reaching anterior margin of transverse keel on sternite 4; sternite 6 with small median tubercle.

Abdominal somites 3–5 without median carina; abdominal somite 6 with shallow median groove ventrally (Figure 2d), without even trace of submedian carinae or median groove dorsally; pleura unarmed. Telson without median groove dorsally.

Antennular peduncle reaching midlength of antennal scale; stylocerite abruptly tapering distolaterally in small acute spine. Antennal scale) 0.7–0.8 of carapace length, about 2.6 times longer than wide; lateral margin nearly straight; distolateral spine distinctly overreaching rounded distal lamella.

Maxilliped 3 reaching or slightly overreaching distal margin of lamella of antennal scale, bearing subdistal clump of 4 spines on ventral surface of antepenultimate segment.

Pereopod 1 with palm about 3.0 times longer than wide; cutting edge moderately oblique; merus with ventral spine arising at midlength of ventral margin. Pereopod 2 chelate, subequal in length to pereopods 3–5, fully flexed at articulation between merus and carpus. Pereopod 3 slender, overeaching pereopod 1. Pereopod 4 with dactylus 0.8–0.9 times as long as propodus. Pereopod 5 similar to pereopod 4.

Color in life. Body light sandy-brown with darker brown speckled spots on dorsal surface of carapace, abdomen, chela and walking legs. Spots on pleura are darker and denser.

Distribution. Natural geographical range includes the Yellow Sea, northern part of the East China Sea, central and southern part of the Sea of Japan, and Japanese mainland (southern Hokkaido to Kyushu); intertidal to 24 m.

The present discovery from Port Phillip Bay, Australia, is considered to be an artificial introduction from East Asian waters.

Key to species of Crangonidae of Port Phillip Bay and Western Port, Victoria

1. Pereopods 2 subequal in length to other pereopods .............

      Crangon uritai Hayashi and Kim, 1999 [Port Phillip Bay]

— Pereopods 2 much shorter than other pereopods .....

      Philocheras 2

2. Carapace with 3 middorsal teeth including epigastric tooth .......

      P. victoriensis [Port Phillip Bay and Western Port]

— Carapace with 1 or 2 middorsal teeth including epigastric tooth 3

3. Carapace with 1 middorsal tooth (epigastric tooth) ......

      P. flindersi [Western Port]

— Carapace with 2 middorsal teeth including epigastric tooth ..... 4

4. Carapace with longitudinal row of small teeth posterior to orbit ...

      P. intermedius [Port Phillip Bay]

— Carapace without longitudinal row of small teeth posterior to orbit

      P. obliquus [Port Phillip Bay]

More Information
Specimen Contact
Jo Taylor
Author
Jo Taylor
Created
09/03/2011 10:27 AEST
Last Updated
09/03/2011 12:25 AEST
Citation
Jo Taylor (2011) Sand shrimp (Crangon uritai) Updated on 3/9/2011 12:25:33 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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