Echinopsyllus nogueirae, Wandeness & George & Santos, 2009

Wandeness, Adriane P., George, Kai H. & Santos, Paulo J. P., 2009, First record of the taxon Echinopsyllus (Copepoda, Harpacticoida, Ancorabolidae) from the deep sea of Campos Basin, Brazil, with the description of three new species and their contribution to phylogenetic analysis, Zoological Journal of the Linnean Society 156 (1), pp. 52-78 : 59-63

ECHINOPSYLLUS NOGUEIRAE SP. NOV.

Type locality: Station 75P, 22°31′28.3″S 40°03′50.4″W, depth 1050 m, layer 0–2 cm, 4 °C, 34.3 psu, Campos Basin (Rio de Janeiro, Brazil) in silt-clay sediments .

Type material: one female (holotype), dissected on 12 slides, MZUSP collection no. 18828 .

Etymology: the species is dedicated in fond appreciation of the late Professor Catarina R. Nogueira, who introduced the first author to the taxonomic study of copepods.

Description: Female. Habitus ( Fig. 7A ) body length measured from tip of R to posterior margin of FR of approximately 673 Mm. Pattern of body processes and sensilla as in E. brasiliensis sp. nov. Telson ( Fig. 10A ) smaller than preceding body somites, broader than long, anal operculum with small teeth. FR ( Fig. 10A ) long and slender, about 11 times as long as broad, with seven setae. Setae I and II of different length, seta I smaller and bare, seta II bipinnate, close to proximal quarter of FR. Seta III bare, inserted in distal quarter of FR. Setae IV, V, and VI inserting distally. Setae IV and V lost during processing, seta VI bare. Seta VII articuled at its base, inserted dorsally in the middle of FR.

A1 ( Fig. 8A ) four-segmented. Segments 1, 3, and 4 elongate. First segment with several long spinules, with one bipinnate seta. Second segment shortest, with five setae. Third segment with seven setae and apical acrothek consisting of aesthetasc and one bare seta. Fourth segment with nine bare setae (one broken) and apical acrothek enclosing two setae and aes. Setal formula: I-1; II- 5; III-8 + aes; IV- 11 + aes.

A2 ( Fig. 9A ). Allobasis ornamented with spinules with two abexopodal setae (distal one bare and smaller than the proximal, pinnate seta), without exp. Enp with several spinules, medially with two (one unipinnate and one bare) spines and one bare seta smaller than preceding spines. Apically with six setae, four of which geniculate and one small bare seta.

Md ( Fig. 7B ). Mandibular palp one-segmented, long and slender; covered with spinules, with one inner and three apical setae.

Mxl ( Fig. 7D ). Praecoxal arthrite with two surface setae subapically and seven distal spines. Coxa with one single bare seta. Basis, enp, and exp fused, bearing three setae (two bare and one unipinnate).

Mx ( Fig. 7C ). Syncoxa with spinule patches. With two coxal endites; proximal endite with one bipinnate spine and second endite with one bipinnate spine and one bare seta. Allobasal endite with one fused spine and an accessory armature consisting of three bare setae, one apically bifid spine, and one spine. Enp represented by two bare setae.

Mxp ( Fig. 8B ) Subchelate and slender. Syncoxa with spinule patches. Enp with curved claw bearing one accessory seta.

P1 ( Fig. 10B ) with three-segmented exp, without enp. Basis transversely prolonged, with bare inner and outer bipinnate seta. Exps 1 and 2 with outer bipinnate spine, exp3 with one bipinnate spine and one geniculate seta on outer margin and two geniculate setae on distal margin.

P2 as in E. brasiliensis sp. nov.

P3–P4 ( Fig. 11A, B ) with transversely prolonged bases ornamented with long spinules and one tube-pore on their dorsal margins. Exps three-segmented, exp2 without inner seta. P3 with one-segmented enp armed with one small and one long bipinnate seta. Enp P4 one-segmented, with one bipinnate seta. Armature formula as follows:

Exopod 1 Exopod 2 Exopod 3 Endopod 1 Endopod 2 Endopod 3 P2 I;0 I;0 II;2;0 – – –

P3 I;0 I;0 II;2;0 2 – –

P4 I;0 I;0 II;2;0 1 – –

P5 ( Fig. 9B ). Baseoendopodal lobe represented by one small bare seta; with tube-pore at base of setophore. Exp distinct, with four bare setae.

GF ( Fig. 9B ) gonopores covered by P6 with one bare seta.

Male unknown.

Figures

Figure 7. Echinopsyllus nogueirae sp. nov., female. A, habitus, lateral view; B, md; C, mx; D, mxl. Scale bars: A = 100 Mm, B–D = 50 Mm.

Figure 8. Echinopsyllus nogueirae sp. nov., female. A, A1, ventral view; B, mxp. Scale bar = 50 Mm.

Figure 9. Echinopsyllus nogueirae sp. nov., female. A, A2; B, P5 with P6. Scale bar = 50 Mm.

Figure 10. Echinopsyllus nogueirae sp. nov., female. A, telson and FR, dorsal view; B, P1. Scale bar = 50 Mm.

Figure 11. Echinopsyllus nogueirae sp. nov., female. A, P3; B, P4. Scale bar = 50 Mm.