Remaneicaris drepanephora ( Kiefer, 1967 )

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 : 512-514

Remaneicaris drepanephora ( Kiefer, 1967)

(Figs. 6–7)

Synonyms: Parastenocaris drepanephora ( Kiefer 1967) ; Remaneicaris drepanephora ( Jakobi 1972) ; Parastenocaris drepanophora ( Löffler 1981) ; Parastenocaris drepaneophora ( Dussart 1984) ; Parastenocaris drepanophora ( Rouch 1986) ; Parastenocaris drepanophora ( Dussart & Defaye 1990) ; Parastenocaris drepanephora ( Reid 1998) ; Remaneicaris drepanephora ( Corgosinho & Martínez Arbizu 2005)

Material examined: The whole type series deposited in the Kiefer's collection at the Staatliches Museum für Naturkunde , Karlsruhe ( Germany). Locus typicus: Rio Tapajós , near the city of Santarém (Pará Brazil)

Male: Length 365 µm from rostrum to distal rim of telson (in accordance with Kiefer 1967, size range vary between 340–380µm from rostrum to telson). Rostrum not fused to Cph, with wide base and 2 sensilla on tip. Cph and Urs-2 with 1 dorsal integumental window. Urs-5 with lateral integumental window on each side of segment. Anal operculum smooth and slightly concave. Furca as depicted for female ( Fig. 7 G), without row of spinules, shorter than telson, 3 times longer than wide, setae I–III and VII at the distal 1/3 opposite to each other, setae II and III approximately of same size, seta I shorter, seta V the longest, seta IV bipinate, as long as seta VI and shorter than VII, seta VI longer than lateral setae. A1 (Fig. 6A): 9-segmented and haplocer; armature beginning with proximal segment: 0/5/4/2/5+Ae/1/2/1/9+Ae. A2 (Fig. 6B): with allobasis; 1-segmented exp with 1 seta, and 1- segmented enp bearing 7 setae. Md, Mx 1, Mx 2 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 and 3 setae on distal endite. P1 (Fig. 6C): basis with outer seta, 3 spinules on outer margin; enp 2-segmented, enp-1 slightly longer than exp-1 and 2 together, without ornamentation on inner margin, outer margin with 3 spinules at proximal 2/3 and 2 spinules at distal 1/3, with 2 anterior distal spinules; enp-2 with 2 spinules on inner margin, 2 spinules on outer margin, 1 unipinate outer spine and 1geniculated seta 2 times 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 1 unipinate outer spine on distal 1/3, 1 unipinate distal outer spine and 2 geniculated setae, innermost the longest. P2 (Fig 6D) coxa with posterior row of small spinules; 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 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 size at distal margin; exp-3 with 1 spinule located medially on outer margin, distal hyaline frill, 1 unipinate subapical spine, 1 unipinate seta and 1 bipinate apical setae, outer seta shorter than inner one; enp 1-segmented, longer than 1/2 exp-1, with 1 distal smooth seta, 2 distal spinules and 3 spinules on outer margin. P3 (Fig. 6E): coxa with posterior row of small spinules; basis with outer seta; enp short, spine-like and without ornamentation; exp 1-segmented, straight, with row of 4 large spinules on proximal 2/3 and 4 strong spinules on distal 1/3; last distal spinule modified, with hyaline lamella on inner margin; apophysis short, triangular, covered by hyaline lamella; thumb is shorter than apophysis, inward curved, with blunt tip. P4 (Fig. 6F): 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 spine at 2/3 of outer margin, 1 distal hyaline frill, 2 spinules medially on outer margin; enp longer than half of exp-1, straight on outer margin, tapering distally at inner margin, with spinules along inner surface decreasing in length from proximal to distal margin..P5 (Fig. 6G): without intercoxal sclerite, 2 plate not fused to the somite, rectangular, ending in small process on inner margin, with 1 long outer seta and 3 smooth distal setae, distalmost seta the longest, proximalmost seta the shortest.

Female: Sexually dimorphic in A1, P3, P4, furca and genital field. Length 360 µm, from cph to distal rim of telson. Rostrum as in male. For sensila see figure 7A. Dorsal integumental windows on cph and double genital somite; lateral window on Urs-4. Telson as it is in male in Fig. 7 F, with 2 ventral spinules on Fig. 7 B. Furca variable, proximally inflate, slightly piriform in specimen depicted in Fig. 7 B, 2.8 times longer than wide in 7B, with small proximal concavity ( Fig. 7 G), about 3 times longer than wide in 7B and F, dorsally ornamented with 2 rows of spinules on 7B, both varieties with dorsal and ventral rows of spinules distally; setae I–III and VII on distal 2/3 opposite to each other, setae II and III approximately of same size, seta I shorter, seta V the longest, seta IV FIGURE 6. Remaneicaris drepanephora ( Kiefer, 1967) , male. A, antennule; B, antenna; C, P1; D, P2; E, P3; F, P4; G, P5, Urs- 1–2. Scale bar= 50µm.

bipinate on 7F, as long as seta VI and VII on 7B and shorter than VII in 7F and G, seta VI longer than lateral setae. A1: 7-segmented; number of setae beginning at proximal segment: 0/4/5/2+Ae/1/2/9+Ae. A2: as it is in male. P3 ( Fig. 7 C): basis with one outer seta, an outer pore and row of spinules on posterior margin; exp 2-segmented, exp-1 with proximal row of spinules, an outer spine, row of spinules before insertion of outer spine, 1 spinule distal to outer spine and row of small spinnules distally on inner margin; exp-2 with 1 outer unipinate spine, 1 bipinate distal seta, 1 spinule medially on outer margin and 1 spinule near the outer spine; enp 1-segmented and spiniform, longer than half of exp-1 with 1 spinule on outer margin. P4: enp ( Fig. 7 D) dimorphic, spiniform, with 2 anterior spinules on inner margin, 2 posterior spinules on outer margin and some alternated spinules distally. P5 ( Fig. 7 E): as in male. Genital field with 1 medially located copulatory pore. Gonopore with transverse slit.

Figures

FIGURE 7. Remaneicaris drepanephora (Kiefer, 1967), female. A, habitus schematic, lateral view; B) telson, and furca, lateral view; C, P 3; D) enp, P 3; E, P 5 and Urs- 1, genital double somite; F, telson and furca, lateral view; G, telson and furca, ventral view. Scale bar = 50 µm.