Remanea arenicola Klie, 1929

Back, Jinwook, Lee, Wonchoel & Huys, Rony, 2011, A new species of Remanea Klie, 1929 (Copepoda: Harpacticoida: Paramesochridae) with a redescription of the type species, Journal of Natural History 45 (47 - 48), pp. 2939-2964 : 2948-2955

Remanea arenicola Klie, 1929

( Figures 8 , 9 )

Original description. Klie (1929): 364–367; figs 44–56.

Type locality. Germany, Kiel Bay , off Bülk lighthouse (vicinity of “ Nebenfahrwassertonne A ”); clean coarse sand, 10 m depth .

Material examined

Zoologisches Museum der Universität Kiel. Walter Klie collection. Two females (Cop 586, 589) and two males (Cop 584, 588) dissected on individual slides.

Unfortunately the slides were partly dried out and not in a sufficiently good condition to make a complete detailed redescription.

Description of female

General shape of appendages similar to those given in Klie’s original description ( Klie 1929).

Caudal ramus ( Figure 8C ) rectangular, about 1.5 times as long as wide; with three inner rows of spinules dorsally; with seven setae; setae I–II arising from anterior outer margin, setae III–VI around posterior margin, and seta VII in distal third of ramus; seta I short and bipinnate; seta II spinulose in distal half; seta III plumose; seta IV well developed and plumose, seta V longest and pinnate in distal half; seta VI spinulose; seta VII bi-articulate at base and naked. Ventral spinules present along posterior margin and at base of seta III.

Antenna ( Figure 8A ): basis with row of spinules distally. Exopod arising from distal margin of basis, two-segmented; exp-1 as long as exp-2; exp-1 with one long pinnate seta; exp-2 with two lateral and two pinnate apical setae. Enp-1 with pinnate seta, without surface ornamentation; enp-2 with two bare setae of different lengths and one spinulose seta laterally, with five geniculate setae and one bare seta fused with largest geniculate seta at base.

P1 ( Figure 8D ): coxa well developed, with rows of spinules as figured. Basis with one inner and one outer pinnate seta. Exopod much shorter than endopod; exp-1 longest, with outer spinules and one pinnate outer spine; exp-2 somewhat swollen distally, with one pinnate outer spine and one long spinulose inner seta; exp- 3 with six spines/setae. Endopod prehensile; enp-1 elongate, longer than exopod, with outer row of spinules, with one long plumose inner seta in proximal third; enp-2 small, quadrangular, with two strong setae and one small pinnate apical element.

P5 ( Figure 9C ) with medially fused baseoendopods and discrete exopods. Baseoendopod with pinnate outer basal seta; endopodal lobes narrow, shorter than exopod, each with one short outer seta and one long slender plumose inner seta, with row of spinules along inner margin. Exopod well developed, with inner and outer rows of spinules; with two short spinulose outer setae and two plumose apical elements (subequal in length).

P6 ( Figure 8B ) forming small narrow transverse plate with one long outer and two bare inner setae; middle seta shortest.

Description of male

Sexual dimorphism expressed in antennule, P3 endopod, P5, P6 and urosomal segmentation.

P3 ( Figure 9A ). Coxa, basis, and exopod virtually similar to those of female (see Klie 1929). Endopod two-segmented; enp-1 with outer rows of spinules and one inner plumose seta; enp-2 longer than enp-1, with two apical pinnate setae and with well developed outer apophysis (see inset in Figure 9A ).

P5 ( Figure 9B ). Baseoendopods confluent, each with one outer bare basal seta. Exopod ovate, discrete, with inner row of spinules, and with two spinulose outer setae, one pinnate apical element, and one pinnate inner seta.

Figures

Figure 8. Remanea arenicola Klie, 1929. Female: (A) Antenna; (B) urosome (excluding P5- bearing somite and caudal rami), ventral; (C) caudal rami, ventral; (D) P1 and intercoxal sclerite, anterior. Scale bars in µm.

Figure 9. Remanea arenicola Klie, 1929. Male: (A) P3, posterior (inset showing apophysis on enp-2, outer lateral); (B) right P5, anterior. Female: (C) fifth pair of legs, anterior. Scale bars in µm.