Remaneicaris tridactyla, Corgosinho, Paulo Henrique C. & Arbizu, Pedro Martínez, 2007

Corgosinho, Paulo Henrique C. & Arbizu, Pedro Martínez, 2007, Three new species of Remaneicaris Jakobi, 1972 (Copepoda, Harpacticoida, Parastenocarididae) from the Ribeirão do Ouro River, Minas Gerais, Brazil, with some remarks on the groundpattern of the Parastenocarididae, Zootaxa 1437, pp. 1-28 : 2-11

publication ID	https://doi.org/ 10.5281/zenodo.175898
DOI	https://doi.org/10.5281/zenodo.6237261
persistent identifier	https://treatment.plazi.org/id/03FE4078-4764-2417-FF6A-B799FE594140
treatment provided by	Plazi
scientific name	Remaneicaris tridactyla
status	sp. nov.

Treatment

Remaneicaris tridactyla n. sp.

Type material: Holotype, one dissected male on 7 slides ( INPA 1339a).

Paratypes: One dissected female on 7 slides ( INPA 1339c); 2 undissected males mounted on different slides ( INPA 1339b and INPA 1339d), 1 dissected male mounted on 7 slides ( INPA 1339e), 1 undissected female mounted on one slide ( INPA 1339f).

Etymology: The species name refers to the trifid structure of the modified thumb of the male leg 3.

Type Location: Ribeirão do Ouro river, Sítio do Corgosinho, Florestal, state of Minas Gerais, Brazil. Coordinates: 19°48’19”S, 44°27’45”W.

Male ( Fig. 1 View FIGURE 1 A–B). Length 404 µm (measured from the tip of rostrum to the posterior rim of anal operculum). Rostrum not fused to cephalothorax, with a wide base and two sensilla on the tip. Cephalothorax and second urosomite with 1 dorsal integumental window. Urosomite 5 with a pair of lateral integumental windows. Dorsal pores on cephalothorax, thoracic somites 1 and 3 and second urosomite. Telson with 1 pair of lateral pores. For sensilla on tergites see Fig. 1 View FIGURE 1 A–B. Telson with 1 dorsal row of 10 spinules located on the anterior third (ARS), 2 rows of 5 large spinules on the posterior half (PRS), anterior to the sensilla, not reaching the operculum and 2 ventral rows of large spinules on the posterior half, near the insertion of the furca ( Fig. 2 View FIGURE 2 A–B). Anal operculum smooth and quadrate. Furca ( Figs. 1 View FIGURE 1 A–B and 2 A–B) about 6 times as long as wide, with 7 setae. All setae located on the posterior third. A1 ( Fig. 3 View FIGURE 3 A) 9–segmented and prehensile; armature beginning with proximal segment: 0/5/4/2/5+Ae/1/4/2/9+Ae, 1 modified seta on the last segment (indicated by an arrow) and 1 hyaline spinule on the seventh and eighth segments. A2 ( Fig. 3 View FIGURE 3 B) with allobasis; 1- segmented exp with 1 seta, and 1-segmented enp bearing an anterior hyaline frill and 7 setae. Md, Mx1, and Mxp armature as P. h i s p a n i c a Martínez Arbizu 1997; Mx2 with 2 slender setae on the proximal endite and 3 on the distal endite, as in R. analuizae Corgosinho & Martínez Arbizu 2005 . Leg 1 ( Fig. 4 View FIGURE 4 A) coxa without setae or spines, with 2 rows of spinules on the posterior side; basis with outer seta and 1 pore on the anterior side, 3 spinules on the outer margin, and 3 distal spinules anterior to the insertion of the enp; enp and exp of the same size; enp 2-segmented, segment 1 with 1 row of 5 long spinules along the inner margin, 1 row of 4 spinules on the outer margin and a posterior hyaline frill; segment 2 with a posterior hyaline frill and 2 distal setae, 1 of them geniculated; first enp segment of the same size of the first two exopodites; exp 3-segmented, segment 1 with 1 outer spine, segment 2 without setae or spines, segment 3 with 2 outer spines, 2 geniculated setae and a posterior pore. Leg 2 ( Fig. 4 View FIGURE 4 B) coxa without setae or spines, with 1 row of small spinules and 3 outer spinules on the posterior side; basis without outer seta and ornamented with 1 row of spinules on the outer margin, 1 row of small spinules at the level of the enp insertion and 1 pore near the outer margin; exp 3- segmented, the first segment approximately the same length as the remaining exopodites, with a proximal row of spinules on the outer margin, distributed in a “V” shape, a row of spinules anterior to the insertion of the outer spine and an inner hyaline frill, segment 2 without armature, with 2 spinules located medially on the outer margin and with a row of distal spinules, segment 3 with 3 setae, a distal hyaline frill on the inner corner and 2 spinules located medially on the outer margin; enp 1-segmented with 1 distal seta, 2 distal spinules, and 3 spinules along the outer margin. Leg 3 ( Fig. 4 View FIGURE 4 C–D) coxa without setae or spines; basis with an outer seta; enp 1-segmented with 3 subdistal spinules; exp 1-segmented, elongated, bearing 2 rows of spinules along the outer margin and with 1 very modified seta (“thumb”) in a subdistal position. Leg 4 ( Fig. 4 View FIGURE 4 E) coxa without setae or spines, with 3 small spinules on the posterior side; basis with outer seta, 1 pore near the outer margin, a row of spinules on the inner margin ( IBRS) and 1 row of larger spinules near the insertion of the enp ( PERS), in a hyaline area of the basis ( PEHZ); exp 3-segmented, segment 1 almost same length as remaining segments, with an outer spine, a proximal row of spinules distributed in a “V” shape (RVS) on the outer margin, a row of spinules anterior to the insertion of the outer spine and an inner hyaline frill on the distal corner, segment 2 without setae, with a row of spinules on the distal portion, a row of small spinules along the inner margin, conferring on it a serrated shape, and with 2 long spinules located medially on the outer margin, segment 3 with 1 apical and 1 subdistal outer seta, a distal hyaline frill on the inner corner and 3 spinules located medially on the outer margin; enp 1-segmented, leaf-shaped, covered with numerous long spinules (hirsute) along the inner and outer margin and with a distal spine. Leg 5 ( Fig. 2 View FIGURE 2 C) triangular, ending in a spiniform process and with all setae arranged on the outer margin.

Female: Sexually dimorphic in number of body segments, A1, leg 3, leg 4 and genital field.

Habitus ( Fig. 5 View FIGURE 5 A–B). Length 413 µm (measured from the tip of rostrum to the posterior rim of anal operculum). Rostrum as in male. Cephalothorax and genital double-somite with 1 dorsal integumental window. Urosomite 4 with 1 pair of lateral integumental windows. Dorsal pores as in male and 1 pair of lateral pores on the telson. For sensilla on tergites see Fig. 5 View FIGURE 5 A-B. Telson with 2 dorsal rows of 4 spinules on the anterior third (ARS), 2 rows of 4 larger spinules on the posterior half, not reaching the operculum (PRS) and 2 ventral rows of large spinules on the posterior half, near the insertion of the furca ( Fig. 5 View FIGURE 5 A–B and 6 A–B). Anal operculum smooth and convex ( Fig. 6 View FIGURE 6 B). Furca ( Fig. 6 View FIGURE 6 A–B) about 5 times as long as wide, with 7 setae. All setae located on the distal third, as in males. A1 ( Fig. 7 View FIGURE 7 A) 7-segmented, not prehensile; number of setae beginning with proximal segment:

0/4/5/2+Ae/1/2/9+Ae. A2 ( Fig. 7 View FIGURE 7 B) with allobasis, 1-segmented exp with 1 seta, 1-segmented enp bearing 7 setae and a posterior hyaline frill. Buccal parts as in male. Leg 1 ( Fig. 7 View FIGURE 7 C) coxa without setae or spines and with 1 posterior row of spinules; basis with outer seta, 3 outer accessory spinules and 3 distal spinules near the insertion of enp; enp and exp as in males. Leg 2 ( Fig. 7 View FIGURE 7 D) as in males. Leg 3 ( Fig. 7 View FIGURE 7 E) coxa without setae or spines, with 2 rows of spinules on the posterior side; basis with 1 outer seta, and ornamented with 1 row of spinules near the insertion of the enp; exp 2-segmented, segment 1 with an outer spine, a proximal row of spinules and a row of spinules next to the outer spine, segment 2 with 1 spine, 1 seta and 2 long spinules on the outer margin; enp 1-segmented and spiniform, with 2 spinules on the outer margin and 1 spinule on the inner margin. Leg 4 ( Fig. 7 View FIGURE 7 F) as in males, except for the presence of a spiniform enp ornamented with 1 row of 4 spinules on the outer margin and a row of small spinules on the basis, near the insertion of the enp. Leg 5 ( Fig. 6 View FIGURE 6 C) as in male. Genital field as illustrated in Fig. 6 View FIGURE 6 C, with a single, medially located copulatory pore. Gonopore is a transverse slit.