Echinopsyllus grohmannae, 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 : 63-67

ECHINOPSYLLUS GROHMANNAE SP. NOV.

Type locality: Station 75F, 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: two females, dissected on 14 slides, MZUSP collection no. 18829 .

Etymology: the species name is given in grateful dedication to Dr. Priscila A. Grohmann (Universidade Federal do Rio de Janeiro, Brazil), in recognition of her contribution to the scientific formation of the first author.

Description: Female: Habitus ( Fig. 12A ) body length measured from tip of R to posterior margin of FR of approximately 670 Mm. Pattern of body processes and sensilla as in E. brasiliensis sp. nov. Telson ( Fig. 12A ) smaller than preceding body somites, broader than long, anal operculum with small teeth. FR ( Fig. 13A ) long and slender, about 11 times as long as broad, with seven setae: I and II bipinnate of nearly same length, inserted close together in the middle of FR. Seta III bipinnate as long as I and II, inserted in distal quarter of FR. Setae IV, V, and VI inserted distally; seta V longest, seta IV much smaller, seta VI shorter than seta IV. Seta VII inserted dorsally in the middle of FR, close to setae I and II.

A1 ( Fig. 14A ) four-segmented. Segments 1, 3, and 4 elongate. First segment with several long spinules and distally with one 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 setae and apical acrothek consisting of two setae and aes. Setal formula: I-1; II- 5; III-8 + aes; IV- 11 + aes.

A2 ( Fig. 14B ) with allobasis ornamented with spinules, with two abexopodal setae (distal one bare, arrowed in Fig. 14B , 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. Terminally with six setae, three of which geniculate, two unipinnate, and one small bare seta.

Md ( Fig. 13B and B′ ). Mandibular palp onesegmented, long and slender; covered with spinules, with two bare terminal setae.

Mxl ( Fig. 12B ). Praecoxal arthrite with two surface setae subapically and seven distal spines. Coxa with one single pinnate seta. Basis, enp, and exp fused, bearing four setae (three bare and one unipinnate).

Mx ( Fig. 13C ). Syncoxa with spinular patches, with two coxal endites; proximal endite with one bipinnate, apically bifid spine, and distal endite with one bipinnate, apically bifid spine and one bare seta. Allobasal endite with one fused spine and an accessory armature consisting of two bare setae, one apically bifid spine, and one spine. Enp with two bare setae.

Mxp ( Fig. 12C ). Subchelate and slender. Syncoxa with spinule patches. Enp with curved claw bearing one accessory seta.

P1 ( Fig. 15A ) with three-segmented exp, without enp. Basis transversely prolonged, with bare inner and outer bipinnate seta. Exps 1 and 2 with outer

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

P3 I;0 I;0 II;2;0

P4 I;0 I;0 II;2;0

bipinnate spine, exp3 with two outer and two apical geniculate setae.

P2 as in E. brasiliensis sp. nov.

P3–P4 ( Figs 15B, B′ and 16A, A′) with transversely prolonged bases, with long spinules on their dorsal margins. Exp three-segmented, exp2 without inner seta. P3 with one-segmented enp, with two small bare setae. Enp P4 one-segmented, with one small bare seta and one longer bipinnate seta. Armature formula as follows:

Endopod 1 Endopod 2 Endopod 3 – – –

2 – –

2 – –

P5 ( Fig. 16B ) baseoendopod bearing two small bare setae accompanied by one tube-pore. Setophore long, articulated. One additional very long tube-pore present on the outer margin near the setophore. Exp distinct, with four setae and one long tubepore.

GF ( Fig. 16C ) gonopores covered by fused P6 bearing one pair of bare setae.

Male unknown.

With the addition of three new species to the genus Echinopsyllus , a key to the species is presented.

1. Cephalothorax with pair of anterolateral conical processes; P2–P4 exp2 with inner seta ... E. normani Sars, 1909 Cephalothorax without pair of anterolateral conical processes; P2 exp2 without inner seta.............................2

2. P4 enp two-segmented ........................................................................................ E. brasiliensis sp. nov. P4 enp one-segmented ........................................................................................................................3

3. P4 enp with one unipinnate seta; P5 benp minute and distinct, with one small bare seta, exp with four bare setae ......................................................................................................................... E. nogueirae sp. nov. P4 enp with two setae; P5 baseoendopodal lobe elongate with two small bare setae and one tube-pore, exp with four bare setae and one tube-pore.............................................................................. E. grohmannae sp. nov.

Figures

Figure 12. Echinopsyllus grohmannae sp. nov., female. A, habitus, lateral view; B, mxl; C, mxp. Scale bars: A = 100 Mm, B, C = 50 Mm.

Figure 13. Echinopsyllus grohmannae sp. nov., female. A, FR, lateral view; B, B′, md; C, mx. Scale bar = 50 Mm.

Figure 14. Echinopsyllus grohmannae sp. nov., female. A, A1; B, A2 (distal minute seta on the allobasis arrowed). Scale bar = 50 Mm.

Figure 15. Echinopsyllus grohmannae sp. nov., female. A, P1 (geniculate outer setae arrowed); B, P4; B′, P4, enp Scale bar = 50 Mm.

Figure 16. Echinopsyllus grohmannae sp. nov., female. A, P4; A′, P4 enp; B, P5; C, GF with P6. Scale bar = 50 Mm.