DIOGENES OF SINGAPORE AND THE MALAY PENINSULA 



43 



ing double row of small spines on upper margin of dactyl; upper 

 margin of palm with very short double row of small spines, outer 

 surface of palm, fixed finger and dactyl with widely scattered small 

 spines and tufts of long setae; carpus with row of spines on upper 

 margin, and outer face with scattered spinules and longitudinal row 

 of spines, all partially obscured by long setae. Ambulatory legs with 

 dorsal margins of dactyls each with somewhat irregular row of small 

 spines and long stiff setae, lateral surfaces each with longitudinal 

 sulcus, mesial surfaces (Fig. 8d, e) each with 2 longitudinal rows of 

 quite long setae; propodi each with double row of spines on dorsal 

 surface, carpi and meri each with single row of spines; lateral 

 surfaces of propodi and carpi tuberculate or spinulose, lateral faces 

 of meri nearly smooth; segments all with setose lateral surfaces. 



Telson (Figs 9f, h) without median cleft, but with incipient lobes 

 markedly asymmetrical; smaller right lobe with few moderately 

 strong spines on terminal margin, lateral margin with several tuber- 

 cles or protuberances; elongate, subtriangular left lobe with few 

 spines on oblique terminal margin and series of spines on lateral 

 margin. 



COLOUR. Unknown. 



Distribution. Indonesia; Malaysia. 



Etymology. This species is named for Dirk Platvoet, Curator of 

 Crustacea, the Instituut voor Taxonomische Zoologie, Zoologisch 

 Museum, Universiteit van Amsterdam. The authors of this study 

 hope that honour has been fully satisfied and thank Dirk for his 

 persistence in locating the type of Diogenes intermedins De Man. 



REMARKS. The species name Diogenes intermedins of De Man. 

 1 892 is preoccupied by Diogenes pugilator var. intermedins Bouvier. 

 1891 (see page 404). According to ICZN 1985: 39, Article 16. a 

 name proposed with the term "variety' or 'form' before 1961 does 

 not prevent availability [Art. 45g].The species of De Man (1892) is, 

 therefore, given the replacement name Diogenes platvoeti nom. nov. 



Of the two specimens in the Lanchester collection, only the 

 female has chelipeds and ambulatory legs. Both the holotype and the 

 Malaysian specimens are notable in lacking armature on the dorsal 

 margins of the branchiostegites. Lanchester's specimens differ from 

 the holotype in having slightly longer antennular and antennal 

 peduncles. In these specimens the antennal peduncles overreach the 

 distal margin of the corneae by nearly the entire length of the 

 ultimate segment (Fig. 6); the antennal peduncles exceed the cor- 

 neae by 0.25-0.35 the length of the fifth segment. In the holotype, 

 the corneae are exceeded by only 0.75 the length of the ultimate 

 antennular segment (Fig. 6) and 0.15-0.20 the length of the fifth 

 segment of the antennal peduncles. De Man ( 1892) distinguished D. 

 intermedins [now D. platvoeti nom. nov.] from D. cnstos by the more 

 strongly bifurcate antennal acicles of his specimen. The acicles of 

 Lanchester's specimens are similarly more strongly forked (Fig. 6), 

 differing from the holotype (Fig. 5) only in having the outer projec- 

 tion slightly broader and the inner projection slightly shorter. The 

 spination of the lateral margins of the second segment of the 

 antennal peduncle is slightly stronger in Lanchester's material, but 

 the dorsal surface is more spinulose in the holotype. Minor differ- 

 ences between the holotype (Fig. 5) and Malaysian specimens (Fig. 

 6) have also been observed in the intercalary rostriform process, 

 which in the former is longer and more prominently spinulose in the 

 proximal half. 



There is general agreement between Lanchester's intact specimen 

 and De Man's specimen as it pertains to armature of the chelipeds; 

 however, we did find a difference in the specific number of spines 

 present on the inner marginal row of the dactyl and on the upper 

 margin of the palm of the left cheliped. Similarly, the spines on the 



outer face of the palm are somewhat stronger in the Malaysian 

 specimen than in the holotype. The row of spines on the dorsal 

 margin of each of the ambulatory dactyls is also stronger in 

 Lanchester's specimens, and the median setal row on the mesial face 

 more complete (Figs 8d, e). The telsons of Lanchester's specimens 

 are also more strongly armed, but the general configuration of the 

 lobes is comparable and the median cleft is absent in both (Figs 9f, 

 h ). Tirmizi and Siddiqui ( 1 982a) noted that females of D. custos have 

 a gonopore only on the right coxa of the third pereopods. Lanchester's 

 female has paired gonopores, a character which distinguishes it not 

 only from D. custos, but also D. planimanus. 



Diogenes stenops Morgan and Forest, 1991 



(Figs 7a, 9g, 13b) 



Diogenes senex: Lanchester, 1 902:366; non Diogenes senex Heller, 



1865. 

 Diogenes jousseanmei: Morgan, 1987b: 179; non Diogenes jousseau- 



mei (Bouvier. 1897). 

 Diogenes stenops Morgan and Forest, 1991 :671, figs 9, 10. 



Material examined. Paratypes: 2d"(SL = 3.20, 5.40 mm), 1 9 

 (SL = 4.90), 25 mi south of Cairns, Queensland, 8 November 1965, 

 27 m, WAM 516-65; 1 cf(SL = 2.42 mm). New Year's Island 



Fig. 12 Left chela (outer face), a. Diogenes planimanus Henderson, 

 1893, 9 SL = 4.85 mm, UMZC Nov. 30, 1899; b. Diogenes platvoeti 

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



