Suborder : Pleocyemata Burkenroad, 1963 Infraorder : Caridea Dana, 1852Superfamily : Alpheoidea Rafinesque, 1815 Family : Alpheidae Rafinesque, 1815 Genus : Synalpheus Spence Bate, 1888 Synalpheus stimpsonii (deMan,1888)Synonyms: Alpheinus tridens Borradaile, 1900; Alpheus amboinae Zehntner, 1894 ; Alpheusstimpsonii de Man, 1888 ; Synalpheus brucei Potts, 1915 ; Synalpheus consobrinus de Man,1909 ; Synalpheusstimpsonii var. maldivensis Coutière, 1905; Synalpheus striatus Kubo,1938 Distribution: 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 alcyonariansand in dead coral heads and under rocks , 2 m to 155m in depth ; intertidal to 155 meters,Collection site : VizhinjamMaterials Examined :2 males of maximum Tl 20 mm and 2 femalesof maximum Tl 15 mmDescription:Thelength 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; styloceritereaching nearly to or overreaching level of distal margin of 1st antennular segment;basal antennal segment (basicerite) with ventrolateraltooth not nearly overreaching stylocerite, dorsaltooth spinose, not accompanied by 2nd, proximal tooth; antennal scale with bladewell-developed; major chela with movable finger not overreachingfixed finger, palm usually terminating distally in tooth at level ofarticulation with movable finger, minor chela without patterned row of setae onextensor margin of movable finger, each finger terminating in single tooth; 2nd pereopod with 5 carpal articles; 3rdpereopod with dactyl biunguiculate, extensor tooth bent at nearly right angleand fully twice as long as flexor tooth, segment neither excavate nor swollenon flexor margin proximal to flexor tooth, merus armed with small, acute distaltooth on flexor margin, without movable spines; uropod with transversearticulation on lateral branch; maximum carapace length to base of rostrumabout 13 mm.Remarks:Found in association with crinoids and rarely with dead corals. S. stimpsonii is species complex.
Colourvariation seen according to the crinoids. A pair obtained with light green andyellow 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.— Archivfür Naturgeschichte 53 (3): 289-600, Plates 11-22a.