Quinquelaophonte prolixasetae, Walker-Smith, 2004

Walker-Smith, Genefor K., 2004, A new species of Quinquelaophonte (Crustacea: Copepoda: Harpacticoida: Laophontidae) from Port Phillip Bay, Victoria, Australia, Memoirs of Museum Victoria 61 (2), pp. 217-227 : 219-222

publication ID	https://doi.org/ 10.24199/j.mmv.2004.61.14
persistent identifier	https://treatment.plazi.org/id/EF3EA343-FFF5-FFED-FF38-0D3DFB4FE6FB
treatment provided by	Felipe
scientific name	Quinquelaophonte prolixasetae
status	sp. nov.

Treatment

Quinquelaophonte prolixasetae View in CoL sp. nov.

Figures 1–8 View Figure 1 View Figure 2 View Figure 3 View Figure 4 View Figure 5 View Figure 6 View Figure 7 View Figure 8

Material examined. Holotype. NMV J52388 About NMV (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. GoogleMaps

Paratypes. NMV J52389 About NMV (1 male, allotype, on 6 slides) , NMV J53020 About NMV (1 female on 5 slides) , NMV J53110 About NMV (1 female on 5 slides) , NMV J53111 About NMV (1 female on 1 slide) , NMV J53112 About NMV (1 male on 1 slide) , NMV J53021 About NMV (20 adult females and 2 juveniles) , NMV J53022 About NMV (9 males) , SAM C6096 View Materials (20 females, including 2 ovigerous and 4 juveniles) , SAM C6097 View Materials (9 males) , SAM C6098 View Materials (8 females on a SEM stub) , SAM C6099 View Materials (4 males on an SEM stub). All paratypes collected with the holotype .

Other material. NMV J48528 About NMV (13 specimens) , NMV J48529 About NMV (3 specimens) , NMV 48530 About NMV (5 specimens) , NMV J48531 About NMV (12 specimens) , NMV J48532 About NMV (29 specimens) , NMV J48533 About NMV (3 specimens) , NMV J48535 About NMV (103 specimens) . Collection data as for holotype GoogleMaps .

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 View Figure 1 ). 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 View Figure 3 , 8D View Figure 8 ). Caudal rami length 3 times width ( Fig. 3D View Figure 3 ); 3 setae on lateral margin ( Figs 3D View Figure 3 , 8C View Figure 8 ), 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 View Figure 3 , 8C View Figure 8 ), terminal accessory seta (VI) on inner subdistal corner, dorsal seta (VII) triarticulate at the base.

Antennule 6-segmented ( Fig. 2A View Figure 2 ), 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 View Figure 2 ), 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 View Figure 2 , 7A View Figure 7 ). Paragnaths as in figures 2H and 7A. Mandible with well developed gnathobase ( Fig. 2C View Figure 2 ), 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 View Figure 2 , 7A View Figure 7 ) 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 View Figure 2 , 7B View Figure 7 ) 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 View Figure 2 ), prehensile, syncoxa with 2 setae, basis without ornamentation, endopod represented by terminal claw with 1 seta and some distal spinules.

P1 ( Figs 3A View Figure 3 , 8A–B View Figure 8 ) 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 View Figure 3 , 4A–B View Figure 4 ). P2 endopod reaching just beyond distal margin of P2 exopod-2 ( Fig. 3C View Figure 3 ). P3 endopod not reaching beyond distal margin of P3 exopod-2 ( Fig. 4A View Figure 4 ). P4 endopod not reaching beyond distal margin of P4 exopod-2 ( Fig. 4B View Figure 4 ). P3 and P4 endopod-2 without tube pore.

Armature formulae for swimming legs:

P5 baseoendopod ( Fig. 5C View Figure 5 ), 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 View Figure 2 , 7C–F View Figure 7 ); P2–P4 larger and more chitinised ( Figs 5B View Figure 5 , 6A–B View Figure 6 ), 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 View Figure 5 ).

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.