no. 3641 STOMATOPOD CRUSTACEA — MANNING 33 



Key to Indo-West Pacific Species of Acanthosquilla 



1. Telson with 4 pairs of fixed marginal teeth 2 



Telson with 2 pairs of fixed marginal teeth 4 



2. Ventral margin of sixth abdominal somite with posterior spines. 



A. tigrina (Nobili, 1903) 

 Ventral margin of sixth abdominal somite unarmed 3 



3. Rostral plate trispinous; dactylus of claw with 10-11 teeth; submedian 



denticles arranged in semicircle A. vicina (Nobili, 1904) 



Rostral plate angled anterolateral^, with median spine; dactylus of claw with 

 7 teeth; submedian denticles in transverse row . . A. humesi, new species 



4. Lobes on outer margin of dactylus subequal; submedian denticles in trans- 



verse row; first and third intermediate denticles larger than second and 



fourth A. acanthocarpus (Miers, 1880) 



Distal lobe on outer margin of dactylus much larger than proximal; submedian 

 denticles in oblique row; second and fourth intermediate denticles larger 

 than first and third A. multifasciata (Wood-Mason, 1895) 



Acanthosquilla humesi, new species 



Figure 11 

 Acanthosquilla Humes, 1965, p. 184. 



Holotype. — 1 9, 62.5; Ambatozavary, Nosy Be, Madagascar; 

 E. Cutler; 16 July 1964; USNM 124095. 



Paratypes. — 1 d\ 63.2; 1 9, 64.5; Antsakoabe, northwestern shore 

 of Nosy Be, Madagascar; dug from 30 cm intertidal sand; A. G. 

 Humes; host no. 889; 12 July 1964; USNM 124096. 



Description. — Eye small, not extending to end of antennular 

 peduncle; cornea subglobular, slightly larger than and set obliquely 

 on stalk; ocular scales small, erect, bases fused, apices divergent. 



Antennular peduncle short, less than half as long as carapace; 

 dorsal processes of antennular somite visible on either side of rostral 

 plate as a slender, anteriorly directed spine. 



Antennal peduncle with 1 mesial and 1 ventral papilla; antennal 

 scale short, less than half as long as carapace. 



Rostral plate trapezoidal, narrowed anteriorly, angled antero- 

 laterally, with slender median spine; anterior portion of median spine 

 resting in apex of V formed by ocular scales. 



Carapace narrowed anteriorly, rounded anterolaterally and poste- 

 riorly, lacking spines, carinae, or cervical groove. 



Raptorial claw stout, dactylus with 7 teeth, penultimate shorter 

 than antepenultimate; base of dactylus with proximal angled projec- 

 tion and distal obtuse projection separated by a shallow concavity; 

 propodus with 4 proximal movable spines and normal pectination; 

 dorsal ridge of carpus terminating in slender spine; merus much longer 

 than ischium. 



273-102—67 3 



