DIOGENES OF SINGAPORE AND THE MALAY PENINSULA 



39 



2mm 



Fig. 6 Shield and cephalic appendages, Diogenes platvoeti nom. nov., 

 9 SL = 4.67 mm. UMZC Nov. 30, 1899. 



cheliped with row of very small spines on upper surfaces of carpus, 

 palm, and dactyl, all practically obscured by rows of long setae. 

 Ambulatory legs with dorsal margins of carpi each with row of 

 closely-spaced small spines; dorsal margins of propodi each with 

 row of very small spinules and long setae (second) or double row of 

 long stiff setae (third); mesial faces of dactyls (Fig. 8a) each with 4 

 rows of setae, dorsal and ventral rows long and simple, median rows 

 shorter and pinnate, more distinct on third. 



Telson with distinct median cleft, lobes slightly asymmetrical; 

 terminal margins with 2-4 moderate to strong and 3-6 smaller 

 spines, sometimes extending onto lateral margins. 



Colour. Not reported. 



Distribution. Vietnam; Malaysia; Indonesia. 



REMARKS. The Malay specimen of D. goniochirus is the largest of 

 12 specimens identified by Lanchester (1902) as Diogenes 

 rectimanus, and the only one he removed from its shell. Lanchester 

 remarked that the small size of the specimens probably accounted 

 for the lack of prominence of the spines on the lower margin of the 

 left chela and more obscure arrangement of granules on this append- 

 age. Judging from the development of the pleopods, this specimen is 

 most probably a mature female. In having a prominent spinose 

 protuberance on the carpus and lack of a crest on the outer surface of 

 the palm of the left cheliped, this specimen agrees well with the 

 paralectotypes of D. goniochirus that we examined. The spinose 

 dorsodistal angle of the palm is also apparent, but not as prominent 



2 mm 



Fig. 7 Shield and cephalic appendages, a. Diogenes stenops Morgan and 

 Forest. 199 1 . ovigerous 9 SL = 3. 1 1 mm, UMZC Nov. 30. 1 899; b. 

 Diogenes mixtus Lanchester, 1902, lectotypecf SL = 6.88 mm, UMZC 

 1.10050. 



as in the paralectotype female. The setation of the mesial faces of the 

 ambulatory legs is a little more distinct, but corresponds well with 

 that of the paralectotypes. The remaining 1 1 specimens, all of 

 appreciably smaller size but none the less mature, differ markedly 

 from this specimen of D. goniochirus, and are assigned toD. avarus. 



Diogenes avar us Heller, 1865 

 (Figs 3b, 8b, 9b, c, d, lib) 



Diogenes avarus Heller, 1 865:83. pi. 7, fig. 2; Alcock, 1905: 68, pi. 



6, figs 6, 6a; Forest, 1956:524, figs l^t;Lewinsohn, 1969:37, fig. 



4; Tirmizi and Siddiqui, 1982a:54, fig. 29; Haig and Ball, 



1988:167; Rahayu and Forest, 1995:398, Figs 2b, g, h. 

 Diogenes rectimanus: Lanchester, 1902:366 (in part) [Non Diogenes 



rectimanus Miers, 1884]. 

 ? Diogenes avarus: Ajmal Khan and Natarajan, 1984:18, fig. 15. 



Material examined. Lanchester's material. 7d\ 3 9,1 ovi- 

 gerous 9 , (SL= 1.04-1.52 mm), 'Loc. ?', 'Skeat' Expedition, 



Malay Peninsula, UMZC, Nov. 30, 1899. 



Diagnosis. Shield (Fig. 3b) longer than broad, with few short 

 transverse spinulose ridges and long setae on dorsal surface; rostrum 

 obsolete or broadly rounded. Dorsal margins of branchiostegites 

 with 5-8 small spines. Ocular peduncles short and moderately stout; 

 overreached by both antennular and antennal peduncles. Ocular 

 acicles broad, with 1-3 strong spines and several minute spinules on 

 terminal margin, not extending entire length. Intercalary rostriform 

 process slender, reaching beyond proximal half of acicle but not 

 beyond tip of inner-most acicular spines.Antennal peduncles slightly 



