Parastenheliidae (Copepoda: Harpacticoida) from the Isles of Scilly Author Gee, J. Michael text Journal of Natural History 2006 2006-12-30 40 47 - 48 2611 2652 http://dx.doi.org/10.1080/00222930601108194 journal article 10.1080/00222930601108194 1464-5262 5230315 Genus Karllangia Noodt, 1964 Diagnosis Parastenheliidae . Body small, usually with deeply divided ornamental hyaline frills. Rostrum, defined at base, triangular, reaching at most to end of second segment of antennule. Operculum semi-circular, variously ornamented. Caudal ramus with row(s) of spinules across dorsal surface and with seven elements. Female antennule eight- or indistinctly ninesegmented but with distal four or five segments small, combined length only slightly longer than segment 4. Male antennule eight-segmented, haplocer with three segments distal to geniculation, segment 5 moderately swollen. Female antenna with partially divided allobasis with a small pinnate seta on abexopodal margin; exopod two-segmented (or segments partially fused), proximal segment with two setae, distal segment with one lateral and two terminal setae; endopod with two subdistal spines and on distal margin one spine, four geniculate setae and two normal setae. Male antenna with enlarged, highly plumose seta on allobasis and exopod segments of different size with only one seta on proximal segment and all lateral setae enlarged and highly plumose. Mandibular basis with three setae, endopod one-segmented with eight setae, exopod usually present as a very small segment with two setae. Maxillule with slender elements on distal margin of praecoxal arthrite, two surface setae and two setae on inner margin; coxal endite with two to four setae and usually a seta representing the epipodite; basis and rami poorly chitinized, endopod present, exopod represented by one seta. Maxilla with three syncoxal endites with 3.2-3.2-3 elements, allobasal endite with three elements, endopod with four or five setae. Maxilliped syncoxa with one seta, basis oval with two setae on palmar margin, endopod a claw with one accessory seta. P1 exopod of three equal segments, exopod 2 with or without a small inner seta, distal segment with four elements (a naked seta, a geniculate spine and two outer spines, all spines strongly spinulous); endopod two-segmented, proximal segment about twice as long as exopod with inner seta implanted medially in a region of reduced chitinization of segment wall, distal segment small with one naked seta, a geniculate spine and a normal spine. P2–P4 rami three-segmented, exopod 1 without inner seta, setae on other segments well developed. Usually no sexual dimorphism in swimming legs but occasionally outer spine on P3 enp 3 in male reduced in size. Setal formula of exp/enp as follows: P2 0.1.223/1.1.121; P3 0.1.2-323/1.1.221; P4 0.1.323/1.1.221. Female P5 with triangular endopodal lobe with five setae and exopod two to five times longer than wide with five or six setae. Male P5 endopodal lobe with two setae, exopod with four setae. Type species: Karllangia arenicola Noodt, 1964 . Other species: K. psammophila Wells, 1967 , K. bengalensis Wells and Rao, 1987 , K. pulchra Meilke, 1994 , K. obscura Mielke, 1994 , K. ornatissima (Monard) comb. nov.