Remaneicaris argentina ( Noodt, 1965 )

Corgosinho, Paulo Henrique C., Mercado-Salas, Nancy F., Arbizu, Pedro Martínez, Silva, Edinaldo Nelson Dos Santos & Kihara, Terue C., 2017, Revision of the Remaneicaris argentina - group (Copepoda, Harpacticoida, Parastenocarididae): supplementary description of species, and description of the first semi-terrestrial Remaneicaris from the tropical forest of Southeast Mexico, Zootaxa 4238 (4), pp. 499-530 : 503

Remaneicaris argentina ( Noodt, 1965)

( Figs. 1–2 )

Synonyms: Parastenocaris argentina ( Noodt 1965) ; Remaneicaris argentina ( Jakobi 1972) ; Parastenocaris argentina ( Rouch 1986) ; Parastenocaris argentina ( Dussart & Defaye 1990) ; Remaneicaris argentina ( Corgosinho & Martínez Arbizu 2005)

Material examined: Noodt's collection; C137 (M3, slide 11; locus typicus and M3, slide 12). Locus typicus: Rio Sierra (La Bolsa), in the mountain between the city of Córdoba and Alta Gracia (Carretera) , Córdoba Argentina .

Male: Length 450 µm (Noodt's measurement, from rostrum to distal rim of furca). Rostrum not fused to Cph, with wide base and two sensilla on tip. Cph and Urs-2 with 1 dorsal integumental window each. Urs-5 with 1 oval lateral window on each side of somite ( Noodt 1965). Anal operculum smooth and slightly concave. Furca as described by Noodt (1965); shorter than telson, 4 times longer than wide, in dorsal view constricted proximally and dilated at midlength, setae I–III and VII at the distal 1/3 opposite to each other, setae I–III approximately of same size, seta V the longest, seta IV longer than seta VI and VII, seta VI and VII approximately of same size. A1 and A2 armature and segmentation as described by Corgosinho eta al. (2007b) for R. tridactyla . A1: 9-segmented, haplocer; armature beginning with proximal segment: 0/5/4/2/5+Ae/1/4/2/9+Ae. 2: with allobasis; 1-segmented exp with 1 seta, 1-segmented enp with 7 setae. Md, Mx1, Mx2 and Mxp armature as described by Corgosinho eta al. (2005, 2007a, 2007b and 2010a). Mx 2: of Remaneicaris type, with 2 slender setae on proximal endite and 3 setae on distal endite. P1 as described for female. P2 ( Fig. 1 A): basis without outer seta, ornamented with 1 row of spinules on outer margin and 1 pore near anterior margin; exp 3-segmented, exp-1 longer than each of the remaining two segments; with PRVS on outer margin, row of spinules anterior to insertion of outer spine, 2 spinules of different size distal to outer spine and inner hyaline frill; exp-2 without armature,with 1 spinule medially on outer margin and row of distal spinules of unequal sizes at distal margin; exp-3 with 1 spinule located medially on outer margin, 1 row of spinules along outer corner, distal hyaline frill, 1 unipinate subapical spine and 2 bipinate apical setae, outer seta shorter than inner one; enp subcylindrical, 1-segmented, nearly half the length of exp-1, with 1 bare distal seta, two distal spinules and 2 spinules on outer margin. P3 ( Fig. 1 B): basis with outer seta; enp 1-segmented, pointed, with thin tip; exp 1-segmented, straight, increasing distally, with proximal hump at 1/3 of inner margin, inner margin with small process on distal 2/3, 2 rows of spinules on outer margin, proximal row of 5 strong spinules, distal row of 4 spinules, distalmost with a hyaline lamella on inner margin,apophysis shorter than thumb, wider than long, with a well developed hyaline margin, which is inwardly turned at the end of a straight exp, conferring to it a final angle of approximately 90° with the main exp axis; thumb long, almost 2/3 as long as exp, inwardly curved on proximal third and almost straight on distal 2/3. P4 ( Fig. 1 C): basis with outer seta and 1 pore on anterior margin; exp 3-segmented, exp-1 longer than each of the remaining two segments with PRVS on outer margin, row of spinules anterior to insertion of outer spine, 2 spinules of different sizes distal to outer spine and inner hyaline frill; exp-2 without armature, with 1 spinule medially on outer margin and row of distal spinules of unequal sizes at distal margin (innermost spinules smaller than outermost ones); exp-3 with 1 bipinate apical seta and 1 bipinate setae at 2/3 of outer margin, 1 distal hyaline frill and 2 spinules medially on outer margin; enp 1-segmented, slightly longer than exp-1, slender, with numerous spinules on inner margin. P5 ( Fig. 1 D): without intercoxal sclerite, 2 plate not fused to the somite, trapezoidal, ending in small process on inner margin, with 1 long outer seta and 3 smooth distal setae, distal most the longest, proximal most the shortest.

Female: Sexually dimorphic in A1, P3, P4 and genital field.

Length 450 µm (Noodt's measurement). Rostrum as in male. Cph and double genital somite with 1 dorsal integumental window each. Urs-4 with 1 oval lateral window on each side ( Fig. 2 D). Furca ( Fig. 2 D) as described by Noodt (1965), shorter than telson, 4 times longer than wide, in dorsal view constricted proximally and dilated at midlength, setae I–III and VII at the distal 1/3 opposite to each other, setae I–III approximately of same size, seta V the longest, seta IV longer than seta VI and VII, seta VI and VII approximately of same size. A1 armature and segmentation as described by Corgosinho eta al. (2007b) for R. tridactyla . A1: 7-segmented; number of setae beginning at proximal segment: 0/4/5/2+Ae/1/2/9+Ae. A2 and P5: as in male. P1 ( Fig. 2 A) basis with outer seta, 3 spinules on outer margin below outer seta; enp 2-segmented, enp-1 as long as exp-1 and 2, without ornamentation on inner margin, outer margin with a strong spinule at the proximal 1/3 and 2 spinules at distal 2/3; enp-2 with 4 spinules on inner margin and 2 on outer margin and 2 distal elements, 1 unipinate outer spine and 1geniculated seta twice as long as outer spine; exp 3-segmented, exp-1 with outer spine and rows of spinules on outer margin, exp-2 unarmed, with spinules on outer margin, exp-3 with spinules on outer margin, 1 unipinate outer spine on distal 2/3, 1 unipinate outer spine and 2 geniculated setae, innermost the longest. P3 ( Fig. 2 B): basis with 1 outer seta; exp 2- segmented, exp-1 with proximal row of spinules, outer spine, row of spinules proximal to outer spine and row of spinules distally, on inner margin; exp-2 with 1 unipinate outer spine and 1 bipinate distal seta; enp 1-segmented and spiniform, with 2 spinules at 3/4 of segment. P4 ( Fig. 2 C): basis with row of spinules near enp insertion and 1 anterior pore; exp as in male, enp spine-like, as long as exp-1, with 2 small spinules on inner margin and two larger spinules on outer margin. Genital field as described for R. analuizae ( Corgosinho & Martínez Arbizu, 2005) with 1 medially located copulatory pore. Gonopore is transverse slit.

Figures

FIGURE 1. Remaneicaris argentina (Noodt, 1965), male. A, P 2; B, P 3; C, P 4; D, P 5. Scale bar = 50 µm.

FIGURE 2. R. argentina (Noodt, 1965), female. A, P 1; B, P 3; C, P 4 (partly); D, Ur- 4, telson and furca, lateral view. Scale bar = 50 µm.