A new species of Quinquelaophonte (Crustacea: Copepoda: Harpacticoida: Laophontidae) from Port Phillip Bay, Victoria, Australia Author Walker-Smith, Genefor K. text Memoirs of Museum Victoria 2004 2004-12-31 61 2 217 227 https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-61-issue-2-2004/pages-217-227/ journal article 10.24199/j.mmv.2004.61.14 1447-2554 12209606 Quinquelaophonte prolixasetae sp. nov. Figures 1–8 Material examined. Holotype . NMV J52388 (ovigerous female, on 8 slides). Australia , Victoria , Port Phillip Bay : at the end of Grand Scenic Drive , in front of the Sands Caravan Park , Moolap ( 38º09.92'S 144º28.42'E ). Collected from the surface of unvegetated sediments, adjacent to subtidal seagrass beds of Heterozostera tasmanica (water depth approximately 1 m ), G. K. Walker-Smith , 17 Nov 1997 . Paratypes . NMV J52389 ( 1 male , allotype , on 6 slides) , NMV J53020 ( 1 female on 5 slides) , NMV J53110 ( 1 female on 5 slides) , NMV J53111 ( 1 female on 1 slide) , NMV J53112 ( 1 male on 1 slide) , NMV J53021 ( 20 adult females and 2 juveniles ) , NMV J53022 ( 9 males ) , SAM C6096 ( 20 females , including 2 ovigerous and 4 juveniles ) , SAM C6097 ( 9 males ) , SAM C6098 ( 8 females on a SEM stub) , SAM C6099 ( 4 males on an SEM stub). All paratypes collected with the holotype . Other material . NMV J48528 ( 13 specimens ) , NMV J48529 ( 3 specimens ) , NMV 48530 ( 5 specimens ) , NMV J48531 ( 12 specimens ) , NMV J48532 ( 29 specimens ) , NMV J48533 ( 3 specimens ) , NMV J48535 ( 103 specimens ) . Collection data as for holotype . Diagnosis . A1 of female 6-segmented; A2 exopod with 3 setae; P1 exopod-2 with 5 thin, elongate setae; P1 endopod-2 accessory setae longer than terminal claw; P3 exopod-3 of female with 1 inner seta; P3 endopod-2 of female with 5 setae; P4 exopod-3 of female without inner seta; P4 endopod-2 with 3 setae; P5 exopod of female with 6 setae; P5 of male with 5 setae. Adult dimensions. Females: mean length 0.85 mm ± 0.05 mm (n = 22). Males: mean length 0.82 mm ± 0.03 mm (n = 21). Description of female. Body tapering posteriorly ( Fig. 1A–B ). Rostrum fused to cephalothorax, with 2 sensillae. Clear delineation of body somites. Somite margins with setules. Hyaline frill present on somite preceding anal somite. Anal somite with anal operculum ( Figs 3D , 8D ). Caudal rami length 3 times width ( Fig. 3D ); 3 setae on lateral margin ( Figs 3D , 8C ), seta I minute (difficult to see under compound microscope), seta IV reduced, seta V well developed and covered with minute spinules (only visible via SEM) ( Figs 3D , 8C ), terminal accessory seta (VI) on inner subdistal corner, dorsal seta (VII) triarticulate at the base. Figure 1. Quinquelaophonte prolixasetae sp. nov. , female, paratype (NMV J53020): A, habitus, dorsal view; B, habitus, lateral view. Antennule 6-segmented ( Fig. 2A ), aesthetasc fused basally to seta on segment 4, terminal segment with smaller aesthetasc fused basally to 2 setae (i.e. tritheck). Antenna with allobasis ( Fig. 2B ), abexopodal seta reduced to a small spine no different from the surrounding spines, exopod reduced to single segment with 3 setae. Endopod with 2 pinnate spines laterally and 3 geniculate setae and 2 pinnate spines terminally. Endopod also with spinules laterally and a subapical hyaline frill. Mouthparts. Labrum with setules along anterior margin ( Figs 2G , 7A ). Paragnaths as in figures 2H and 7A. Mandible with well developed gnathobase ( Fig. 2C ), palp 1-segmented and with 4 setae (endopod and exopod fused to basis), endopod represented by 3 setae, exopod represent by 1 seta, basal armature represent by a larger pinnate seta. Maxillule ( Figs 2D , 7A ) arthrite with 6 spines and a row of setae on the posterior surface, also with 1 seta on lateral margin; coxa with 1 smooth seta, 1 long spine and a row of spinules on upper surface; endopod and basis fused, endopod represented by 2 setae, basis endite with 2 smooth setae and 1 long spine; exopod 1-segmented and with 2 smooth setae. Maxilla ( Figs 2E , 7B ) syncoxa with 3 endites, first endite with 1 spinose seta, middle endite with 2 setae and 1 pinnate spine, distal endite with 1 pinnate spine and 2 setae; allobasis with a pinnate claw and 2 smooth setae inserted at the base of the claw, also with 3 lateral setae that are remnants of the endopod. Maxilliped ( Fig. 2F ), prehensile, syncoxa with 2 setae, basis without ornamentation, endopod represented by terminal claw with 1 seta and some distal spinules. Figure 2. Quinquelaophonte prolixasetae sp. nov. , female, holotype (NMV J52388): A, A1, ventral view; B, A2. Female, paratype (NMV J53110): C, mandible; D, maxillule. Female, paratype (NMV J53020): E, maxilla; F, maxilliped; G, labrum; H, paragnaths. Male, paratype (NMV J52389): I, A1, dorsal view. Figure 3. Quinquelaophonte prolixasetae sp. nov. , female, holotype (NMV J52388): A, P1; C, P2. B, P2 Q. wellsi (redrawn from Hamond, 1973 ). Female, paratype (NMV J53020): D, caudal rami and anal somite. P1 ( Figs 3A , 8A–B ) coxa with spinules on outer margin. Basis with 2 rows of spinules and 2 spinulose spines. Exopod 2-segmented, exopod-1 with 3 rows of spinules and 1 unipinnate spine, exopod-2 with 5 elongate, smooth setae. Endopod 2-segmented, endopod-1 with fine setules along inner margin, endopod-2 with 1 spinulose claw, 3 setae on lateral margin and 2 short setae at the base of the claw, terminal accessory seta is more than twice the length of the claw. P2–P4 exopod 3-segmented, endopod 2-segmented ( Figs 3C , 4A–B ). P2 endopod reaching just beyond distal margin of P2 exopod-2 ( Fig. 3C ). P3 endopod not reaching beyond distal margin of P3 exopod-2 ( Fig. 4A ). P4 endopod not reaching beyond distal margin of P4 exopod-2 ( Fig. 4B ). P3 and P4 endopod-2 without tube pore. Figure 4. Quinquelaophonte prolixasetae sp. nov. , female, holotype (NMV J52388): A, P3; B, P4. Armature formulae for swimming legs: Figure 5. Quinquelaophonte prolixasetae sp. nov. male, paratype (NMV J52389): A, P1 and intercoxal sclerite; B, P2 and intercoxal sclerite; D, section of urosome, ventral view showing P5 and P6. Female, holotype (NMV J52388): C, P5.

Exopod	Endopod
P2	0.1.123	0.120
P3	0.1.123	0.221
P4	0.1.023	0.120

P5 baseoendopod ( Fig. 5C ), outer setophore with 1 seta, endopodal lobe with 2 serrate spines and 3 smooth setae, endopodal lobe not reaching to distal margin on exopod. Exopod longer than wide, with 3 pinnate setae and 3 smooth setae, as well as some spinules. Description of male. Male same as for female except for the following: A1 subchirocer and without seta on segment-1 ( Figs 2I , 7C–F ); P2–P4 larger and more chitinised ( Figs 5B , 6A–B ), lateral spines longer, exopod-3 almost at right angles to exopod-2. P4 endopod-2 more than 2 times length of endopod-1. P5 reduced to 5 setae ( Fig. 5D ). Etymology. Prolixus (Latin): stretched out, long; plus setae (Latin): bristles; referring to the five elongate setae on P1 exopod-2. Distribution. Australia , Victoria , Port Phillip Bay, specifically: Blairgowrie, St Leonards, Grassy Point, Point Richards, Clifton Springs and Moolap. Remarks. Although all appendages of the holotype have been mounted on microscope slides, the orientation of the mouthparts did not allow for clear illustration, thus mouthparts have been illustrated using paratypes . Careful comparison of the holotype and paratypes were made.