Echinopsyllus brasiliensis, 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 : 55

ECHINOPSYLLUS BRASILIENSIS SP. NOV.

Type locality: Station 49K, 22°04′33.9″S 39°52′04.9″W, depth 750 m, layer 0–2 cm, 9.4 °C, 34.6 psu, Campos Basin (Rio de Janeiro, Brazil) in silt-clay sediments .

Type material: one male (holotype), dissected on 15 slides, MZUSP collection no. 18827 .

Etymology: The specific name refers to the country where the species was collected.

Description: Male: Habitus ( Fig. 2A ) long and slender, without clear demarcation between prosome and urosome. Body length measured from tip of R to posterior margin of FR approximately 720 Mm. Integument moderately chitinized and ornate, with series of conical processes bearing unmodified sensilla arrowed in Figure 2A . All remaining sensilla on body somites branched. Cephalothorax ( Fig. 2A ) with two pairs of lateral and two pairs of dorsal processes. All processes apically with sensilla, each lateral process with one long tube-pore subdistally. Dorsal processes backwardly directed and armed with long spinules. Second pair of dorsal processes longer than first pair, each process protruded at its base and bearing additional sensilla proximally. Rostrum ( Fig. 2A ) small, rectangular, fused to cphth, with very long tube-pore at its tip, two sensilla, and with membranous bulbs laterally. Body somites bearing P3–P5 dorsally with tube-pores. All somites except for free abdominal somites third and fourth bearing dorsal cuticular processes, accompanied by sensilla apically. First and second abdominal somites dorsally with basally fused pair of divergent processes. Telson ( Fig. 3A ) smaller

Endopod 1 Endopod 2 Endopod 3 – – –

– – –

0 Apophysis 2 (male)

0 2 (female)

1 – –

than preceding body somites, broader than long, anal operculum with small teeth.

FR ( Fig. 3A ) long and slender, about 11 times as long as broad, with seven setae: I and II of nearly same length, inserted close together in the middle of FR. III as long as I and II, inserted in distal quarter of FR. IV, V and VI inserted distally; seta V longest, seta IV much smaller, VI shorter than IV. Seta VII articulated at its base, inserted dorsally in the middle of FR, close to setae I and II.

A1 ( Fig. 4A and A′ ) eight-segmented, subchirocer. First segment longest, with several long spinules, and with one bipinnate distal seta. Second segment smaller than first one, with six bare setae and several long spinules posteriorly. Third segment much smaller than preceding segments, with five bare setae. Fourth segment smallest, with two bare setae. Fifth segment slightly swollen, covered with long hairy spinules, and bearing seven very small spiniform setae, one longer seta proximally, three long setae distally, and one seta plus one aes arising subterminally from long protrusion. Sixth segment slender, with three modified spines, arrowed in Figure 4A′ , on its dorsal margin. Seventh segment small, with one bare seta; eighth segment enlarged, distally acute, with eight bare setae and one aes fused with one additional seta. Setal formula: I-1; II- 6; III-5; IV- 2; V-12 + aes; VI-3; VII-1; VIII-9 + aes.

A2 ( Fig. 4B ) with allobasis covered with spinules, with two abexopodal setae (the distal one bare and smaller than the first, bipinnate 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 long, dentate, and geniculate, two unipinnate setae, and one small bare seta. Subterminally on anterior margin there is a strong cuticular dentate frill.

Md ( Fig. 2B and B′ ) gnathobase badly damaged. Mandibular palp one-segmented, long and slender, covered with spinules, with two apical setae.

Mxl ( Fig. 2C ) praecoxal arthrite apically with seven strong spines, subapically with two surface setae. Additionally with surface row of long spinules. Coxa with one single bare seta. Basis, enp, and exp fused, bearing four setae.

Mx ( Fig. 2D ) badly damaged, proximal endite with one seta.

Figures

Figure 2. Echinopsyllus brasiliensis sp. nov., male. A, habitus dorsal view (unmodified sensillum arrowed); B, B′, md; C, mxl; D, mx. Scale bars = 100 Mm.

Figure 3. Echinopsyllus brasiliensis sp. nov., male. A, telson and FR, dorsal view; B, P5. Scale bar = 50 Mm.

Figure 4. Echinopsyllus brasiliensis sp. nov., male. A, A1 ventral view; A′, A1 segments 4–8 (modified spines arrowed); B, A2. Scale bar = 50 Mm.