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 Foweya anglica (Norman and T. Scott) comb. nov. ( Figures 7 –11) Synonyms Parastenhelia anglica Norman and T. Scott, 1905 . Material examined Holotype , 1 ♀ , dissected onto one slide, collected by Norman at Fowey, Cornwall , NHM Reg. No. 1911.11.8 .M.2423.371 . Paratype , 1♀ (spirit preserved) in Norman Collection NHM Reg. No. 1911.11.8.43325. Other material from St. Martins Flat , Isles of Scilly , 1♀ Figure 7. Foweya anglica comb. nov. ♀ habitus: (A) lateral view. ♀ urosome, omitting P5 bearing somite: (B) dorsal view; (C) ventral view. Figure 8. Foweya anglica comb. nov. „ urosome (excluding P5 bearing somite): (A) dorsal view; (B) lateral view; (C) ventral view; (D) Antennule segmentation. ♀ operculum and caudal ramus: (E) dorsal view; (F) ventral view. Figure 9. Foweya anglica comb. nov. ♀: (A) Antennule segmentation; (B) antenna; (C) mandible; (D) maxillule; (E) maxilla; (F) maxilliped. Figure 10. Foweya anglica comb. nov. ♀: (A) P1; (B) P2 protopod and endopod 1; (C) P5. „ : (D) P1 basis. Figure 11. Foweya anglica comb. nov. ♀ : (A) P3; (B) P4 exopod 3. „ : (C) P5. and 1 „ (each dissected onto three slides), NHM Reg. Nos 2006.1984–1985 and 3 „ (spirit preserved), NHM Reg. Nos 2006.2003–2005. Description of female Body ( Figure 7 ). Length 0.53 mm , semi-cylindrical, widest at posterior margin of cephalothorax, tapering posteriorly, without clear distinction between prosome and urosome. Cephalothorax tapering anteriorly and with pores and sensilla as in Figure 7A . This and free prosomites with plain hyaline frills. Urosomite-1 (P5-bearing somite) with two short rows of small spinules dorsally. Genital double somite with fusion line marked by lateral sub-cuticular rib and a row of spinules dorsally; posterior margin of double somite with lateral row of short spinules and a ventro-lateral row of longer spinules. Genital apparatus ( Figure 7C ) consisting of median ventral copulatory pore and separate anterior gonopores armed internally with a row of teeth each covered by a vestigial P6 bearing three setae. Urosomite 4 with lateral row of small spinules and ventral row of larger spinules. Urosomite 5 unadorned. Hyaline frills on urosomites delicate but deeply divided and with minutely dentate distal margin. Anal somite with a row of spinules near ventral anterior margin; partially divided on posterior margin which bears a row of spinules ventrally at base of caudal rami. Anal operculum semi-circular, ornamented with approximately 30 small, closely set denticles ( Figures 7B , 8E ). Caudal rami ( Figure 8E, F ) about as long as broad with a diagonal rows of spinules on dorsal face and a row of spinules and a tube pore on ventral posterior margin: bearing seven setae, antero-lateral seta I minute; setae II and III broad, spinulose with terminal flagellum; setae IV and V well developed, seta VI long and naked; triarticulate seta VII arising from dorsal distal part of ramus. Rostrum ( Figure 9A ). Well developed, reaching almost to end of segment 2 of antennule, defined at base, triangular with rounded tip and a pair of sub-apical sensilla. Antennule ( Figure 9A ). Distinctly nine-segmented, combined length of distal five segments markedly longer than segment 4. All segments without pinnate setae; aesthetascs on segments 4 and 9. Setal formula as follows: 1–[1], 2-[8], 3–[4], 4-[2+(1+a)], 5-[2], 6-[2], 7- [2], 8-[2], 9-[5+(2+a)] but some setae probably missing on segments 2 and 3. Antenna ( Figure 9B ). Allobasis partially divided, with a pinnate seta and a row of spinules on abexopodal margin. Exopod two-segmented, proximal segment with two setae (a naked proximal seta and a strong pinnate distal seta); distal segment with a distal dentate frill and five setae (two strong pinnate setae on lateral margin and, on distal margin, a strong pinnate seta, a well-developed naked seta and a very small naked seta). Endopod with row of spinules and two sub-distal spines on outer margin; distal margin with two rows of spinules and seven elements, a pinnate spine, four geniculate setae (inner with large pinnules at geniculation) and two plain setae, one of which is fused to base of inner geniculate seta. Mandible ( Figure 9C ). Coxal gnathobase well developed with bicuspid and unicuspid teeth and a seta at distal corner. Basis with row of spinules on outer and inner margin and three pinnate setae on distal margin; endopod elongate, one-segmented, with two lateral and six terminal setae; exopod small, one-segmented, with two lateral and two terminal setae. Maxillule ( Figure 9D ). Praecoxal arthrite with six slender elements on distal margin (of which at least one is pinnate at tip), two geniculate surface setae and three pinnate setae on inner margin. Coxal endite with two subdistal setae and four setae on distal margin; coxal epipodite represented by one seta. Basis with seven setae (four on distal margin and three subdistally); rami fused to basis but clearly discerned, endopod one-segmented, flexible and poorly chitinized with four setae; exopod one-segmented with two setae. Maxilla ( Figure 9E ). Coxa with row of spinules on outer margin and three endites on inner margin, proximal endite broad and bicuspid with two pinnate setae on inner cusp and two naked setae on outer cusp; middle and outer endite each with three setae (one broad and pinnate); allobasal endite with one fused spine, one articulating, pinnate, spine and two naked setae; endopod with four setae. Maxilliped ( Figure 9F ). Syncoxa with two rows of short, and two rows of long, surface spinules and three pinnate setae on distal margin. Basis with row of spinules on outer margin and, on lateral face, bearing two pinnate setae (one much larger than the other) near palmar margin. Endopod represented by a well-developed claw with small teeth on distal inner margin and two accessory setae proximally. P1 ( Figure 10A ). Intercoxal sclerite small, oval, unadorned. Praecoxa small, triangular with row of long spinules on distal margin. Coxa with a row of setules on outer margin, a row of spinules at the outer distal corner and four rows of small spinules on anterior face. Basis with rows of spinules on median distal margin and at base of inner and outer stout pinnate spines. Exopod three-segmented, middle segment only slightly longer than proximal segment, distal segment small; proximal and middle segments with row of spinules on outer margin and a spine at outer distal corner; middle segment with a small, naked seta at inner distal corner; distal segment bearing a slender, naked, geniculate seta, a spinulous, geniculate, spine and two spinulose, non-geniculate spines. Endopod two-segmented. Proximal segment elongate, about twice as long as exopod, with a row of spinules on outer margin; at one third of segment length the chitinous segment wall is noticeably thinner and at same point arises a stout, plumose, inner seta; distal segment small, bearing a very small naked seta and two minutely spinulose spines, one twice as long as the other. P2–P4 ( Figures 10B , 11A, B). Intercoxal sclerite with two rows of spinules (except on P4); praecoxa small with row of spinules on distal margin; coxa with row of spinules on outer margin and three rows of spinules on anterior face; basis with row of setules near inner margin and spinules on median distal margin and at base of outer element which is a stout pinnate spine on P2 and a naked seta on P3 and P4. Both rami three-segmented, all segments with row of spinules on outer margin; exp 2 and 3 and enp 3 with pore on anterior face; exp 1 with an inner seta; all setae as shown in figure 11A except inner seta on P2 enp 1 shorter than on other limbs ( Figure 10B ) and middle inner seta on P4 exp 3 more strongly developed with a serrate margin (Figure 11B). Setal formula of swimming legs as follows: Exopod Endopod P1 0.1.022 1.111 P2 1.1.223 1.1.221 P3 1.1.323 1.1.321 P4 1.1.323 1.1.221 P5 ( Figure 10C ). Benps of each side not fused medially and exopods also separate. Benp with well-developed inner expansion triangular in shape with row of setules on inner margin, row of spinules on outer margin and bearing five pinnate setae (four more or less equal in length, inner distal seta, missing in Figure 10C , somewhat longer). Outer basal peduncle of benp with a few spinules and a naked seta. Exopod slender, almost three times longer than wide, with row of pinnules on outer margin and spinules on inner margin, and bearing six setae (one pinnate seta on inner margin, two naked setae on distal margin and three minutely pinnate setae on outer margin). Description of male As in female except for urosome, antennule, P1 basis, P5 and P6. Body. Slightly smaller than female, length 0.32–0.443 mm (mean 0.37 mm , n 54) and urosomites 2 and 3 not fused ( Figure 8A–C ). Body ornamentation as in female except that row of spinules on urosomite 3 complete both dorsally and ventrally. Antennule ( Figure 8D ). Ten-segmented, haplocer, with moderately swollen segments 5–7 and major articulation between segments 7 and 8; with row of spinules and aesthetasc on segment 5, acrothek of two setae and small aesthetasc on distal segment. All setae naked. Tentative setal formula:- 1 [1], 2 [10], 3 [8?], 4 [2], 5–7 [11+(1+a)], 8 [2sp+1], 9[4], 10 [5+(2+a)]. P1 basis ( Figure 10D ). As in female except that inner spine modified to have a bifid tip bearing a minute setule. P5 (figure 11C). Benps of each side fused medially, inner expansions more rounded than in female, with row of spinules on inner and outer margin and bearing two pinnate setae, outer twice as long as inner. Exopod a single segment, oval, not quite twice as long as wide, with short row of spinules on inner and outer margin and bearing six setae as shown in Figure 11C. P6 ( Figure 8C ). A single plate with three setae on a small extension on each side.