S.stimpsonii

 

 

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
Man,1888)

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,
1938           

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

Location : Vizhinjam

Specimens
Examined : 2 males and 2 females

 

 

 

 

 

 

 

Description:The
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
well-developed; 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.

 

Carapace depressed and 
rounded ridges running on to it and in between them grooves are present;
2-3 times longer and wider rostrum than the orbital processes; absence of
orbitorostral process large chela propodus upper margin ending in tooth; same
length of fixed finger and dactylus of small chela;fingers not crossing; the
merus of 3rd periopod with acute distal tooth; dactylus of  lower claw acute;weak dorsolateral setae on
telson.

Remarks:
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.