84 



R. HUYS AND S. OHTSUKA 



Table 1 Interstitial harpacticoid copepods reported from marine localities in Japan. 



Species 



Locality 



Reference 



ECTINOSOMATIDAE 



Microsetella norvegica (Boeck, 1864) 

 Arenosetella bidenta Ito, 1972 

 Noodtiella sp. 



DARCYTHOMPSONIIDAE 



Leptocaris brevicornis (van Douwe, 1904) 



PARAMESOCHRIDAE 

 Paramesochra sp. 



LEPTASTACIDAE 



Cerconeotes japonicus (Ito, 1968) 

 Paraleptastacus unisetosus Ito, 1972 



CYLINDROPSYLLIDAE 



Arenopontia ishikariana Ito, 1968 

 Arenopontia sakagamii Ito, 1978 

 Stenocaris intermedia Ito, 1972 

 Psammopsyllus imamurai Kikuchi, 1972 



PARASTENOCARIDIDAE 



Parastenocaris hinumaensis Kikuchi, 1970 



Hokkaido 

 Hokkaido 

 Hokkaido 



Lake Hinuma 1 



Hokkaido 



Hokkaido 

 Hokkaido 



Hokkaido 

 Bonin Islands 

 Hokkaido 

 Lake Hinuma 1 



Lake Hinuma 1 



Ito (1968) 



Ito (1972, 1984) 



Ito (1984) 



Kikuchi & Yokota 

 (1984) 



ltd (1984) 



Ito (1968, 1984) 

 Ito (1972, 1984) 



Ito (1968, 1984) 

 Ito (1978) 

 Ito (1972) 

 Kikuchi (1972) 



Kikuchi (1970) 



1 Brackish lagoon. 



fixed and preserved in 10% neutralized formalin/sea-water. 

 Females of S. flandricus Willems & Claeys, 1982 were 

 collected by the senior author in different localities along the 

 coast of The Netherlands in the course of the biological 

 monitoring programme BIOMON. All specimens have been 

 deposited in the collections of The Natural History Museum, 

 London. 



Specimens were dissected in lactic acid and the dissected 

 parts were placed in lactophenol mounting medium. Prepara- 

 tions were sealed with glyceel (Gurr®, BDH Chemicals Ltd, 

 Poole, England). All drawings have been prepared using a 

 camera lucida on a Leitz Diaplan differential interference 

 contrast microscope. The descriptive terminology is adopted 

 from Huys & Boxshall (1991). Abbreviations used in the text 

 are: P1-P6, first to sixth thoracopod. 



DESCRIPTIONS 



Family Cylindropsyllidae 



Subfamily Leptopontiinae Lang, 1948 



The genus Syrticola was established by Willems & Claeys 

 (1982) to accommodate the type species S. flandricus Willems 

 & Claeys, 1982 and Tetragoniceps trispinosus A. Scott, 1896. 

 Previously, the latter species had been considered 'species 

 incertcC in the genus Evansula T. Scott and thus placed in the 

 subfamily Cylindropsyllinae (Lang, 1948). The close relation- 

 ship between Syrticola and Notopontia Bodiou noted by 

 Willems & Claeys (1982) was already hinted at by Bodiou 

 (1977) who recognized a certain resemblance between T. 

 trispinosus and N. stephaniae Bodiou, 1977, and indirectly 

 also by Mielke (1982) who described (?) N. galapagoensis, a 



species provisionally placed in Notopontia but subsequently 

 allocated to Syrticola (Bodiou & Colomines, 1986; Willems et 

 ai, 1987). However, none of these authors has formally 

 assigned either of these genera to any of the subfamilies of 

 the Cylindropsyllidae recognized at that time. The only 

 attempt was that by Bodiou (1977) who suggested that 

 Notopontia is closest to Evansula (Cylindropsyllinae) but to a 

 certain extent is also related to Arenopontia Kunz and 

 Leptopontia T. Scott (Leptopontiinae). 



Lang (1948) subdivided the family into the Cylindropsylli- 

 nae, Leptastacinae and Leptopontiinae and a fourth subfam- 

 ily, the Psammopsyllinae, was added by Krishnaswamy 

 (1956). Recently, the Leptastacinae has been upgraded to full 

 family status (Huys, 1993). The diagnostic sexual dimorphism 

 displayed on thoracopods 2 and 3 by all genera of the 

 Cylindropsyllinae excludes Notopontia and Syrticola from 

 this subfamily since their swimming leg sexual dimorphism is 

 only slightly developed (and therefore might well have been 

 overlooked in Notopontia for which it has been recorded as 

 being completely absent). A detailed comparison with the 

 Leptopontiinae, currently encompassing Arenopontia, 

 Par arenopontia Bodiou & Colomines and Leptopontia, 

 reveals a suite of apomorphic characters supporting a sister- 

 group relationship between Leptopontia and the Notopontia- 

 Syrticola lineage. These characters include: (i) anal 

 operculum drawn out into spinous process(es); (ii) outer 

 distal corner of caudal ramus produced into backwardly 

 directed spinous process; (iii) first antennulary segment ( 

 extremely elongated, much longer than second; (iv) mandib- 

 ular gnathobase stylet-like with teeth along one side; (v) 

 distal exopod segment PI with 3 armature elements (proximal 

 outer spine lost); (vi) middle exopod segment PI without 

 outer spine (in Syrticola and Notopontia the middle and distal 

 segment are fused or have failed to separate); (vii) apical 

 spines of distal exopod segments P3-P4 setiform; (viii) sexual 



