Suborder proximal tooth; antennal scale with blade well-developed;



Suborder : Pleocyemata Burkenroad, 1963   

Infraorder : Caridea Dana, 1852

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Superfamily : Alpheoidea Rafinesque, 1815 

Family : Alpheidae Rafinesque, 1815 

Genus : Synalpheus Spence Bate, 1888 


Synalpheus stimpsonii  (de

Synonyms:  Alpheinus tridens Borradaile, 1900; Alpheus amboinae Zehntner, 1894 ; Alpheus
stimpsonii de Man, 1888 ; Synalpheus brucei Potts, 1915 ; Synalpheus consobrinus de Man,
1909 ; Synalpheus
stimpsonii var. maldivensis Coutière, 1905; Synalpheus striatus Kubo,

: Indian Ocean, Eastern Africa and Madagascar to Singapore,Thailand, Japan, Philippines,
Indonesia, Australia, and Marshall,Gilbert, and Loyalty islands

 Habitat : Marine,
associated with crinoids, occasionally with alcyonarians
and in dead coral heads and under rocks , 2 m to 155m in depth ; intertidal to 155 meters,

Collection site : Vizhinjam

 Examined :
2 males  of maximum Tl 20 mm and 2 females
of maximum Tl 15 mm

length of  rostrum reaching 1st  antennular segment; slightly concave dorsally,
seen more wider at base than in the orbital teeth part; 6th  abdominal somite with or without acute tooth;
at mesial end of posterolateral lobe on either side of base of telson,
posterior margin unarmed mesially; telson with dorsolateral spines distinct,
anterior pair situated slightly anterior to midlength,
posterior angles not projecting; stylocerite
reaching nearly to or overreaching level of distal margin of 1st antennular segment;
basal antennal segment (basicerite) with ventrolateral
tooth not nearly overreaching stylocerite, dorsal
tooth spinose, not accompanied by 2nd, proximal tooth; antennal scale with blade



major chela with movable finger not overreaching
fixed finger, palm usually terminating distally in tooth at level of
articulation with movable finger, minor chela without patterned row of setae on
extensor margin of movable finger, each finger terminating in single tooth; 2nd
 pereopod with 5 carpal articles; 3rd
pereopod with dactyl biunguiculate, extensor tooth bent at nearly right angle
and fully twice as long as flexor tooth, segment neither excavate nor swollen
on flexor margin proximal to flexor tooth, merus armed with small, acute distal
tooth on flexor margin, without movable spines; uropod with transverse
articulation on lateral branch; maximum carapace length to base of rostrum
about 13 mm.

Found in association with crinoids and rarely with dead corals. S. stimpsonii is species complex.Colour
variation seen according to the crinoids. A pair obtained with light green and
yellow tinges and a pair with dark brown.

Original description :
De Man, J.G., 1888b. Bericht über die von Herrn Dr.
J. Brock im indischen Archipel gesammelten Decapoden und Stomatopoden.— Archiv
für Naturgeschichte 53 (3): 289-600, Plates 11-22a.