Glossoscolex riograndensis subsp. nativus, 2018

Bartz, Marie L. C., James, Samuel W., Steffen, Gerusa P. K., Antoniolli, Zaida, Steffen, Ricardo B. & Brown, George G., 2018, New species-group taxa of Glossoscolex (Clitellata: Glossoscolecidae) from Rio Grande do Sul, Brazil, Zootaxa 4496 (1), pp. 548-561 : 553-554

GlossosColex (GlossosColex) riograndensis nativus Bartz & James , n. sp.

( Figures 1C,D )

Holotype. COFM BRRS0043 one adult, natiVe grassland, Santana do LiVramento , Rio Grande do Sul, Brazil, 29°46'23,1''S 54°05'43,1''O, 181 masl. 19 August 2010, M.P. Pontelli coll.

Paratype. COFM BRRS 0044 one adult. Same locality and collection data as holotype.

Etymology. The species is named from latin for “natiVe”, a natiVe species from the State of Rio Grande do Sul, Brazil.

Description. Dimensions: Holotype 48 mm by 3.2 mm at x, 4.0 mm at clitellum, 3.8 mm at xl, 169 segments; paratype 53 mm by 4.1 mm at x, 4.2 mm at clitellum, 3.7 mm at xl, 180 segments. Body cylindrical. Setae closely paired throughout; setal formula aa:ab:bc:cd:dd = 6.8:0.2:1.0:0.1:9.8. Setae not Visible before clitellum. Prostomium prolobous. Unpigmented. OVipores almost inVisible, in ab. Male pores 1.9 mm apart on xVii Within paired round eleVations (like a mound); clitellum saddle, 1/4 xiV, xV–1/2 xxV on the dorsal face, Ventral xV–1/2 xxV ( Fig. 1C,D ). Nephropores after clitellum in line of b.

Septa 6/7–10/11 equally thick and muscular. Alimentary canal With barrel-shaped gizzard in Vi; esophagus With high cheVron-patterned lamellae Vii–xi, ValVular in xii, intestinal origin xiii; typhlosole origin xiii, in xiii– xxVii zig-zag With Ventral edge bent oVer to form pockets, after xxViii simple WaVy lamina. Calciferous glands paired xii, flat bean-shaped, pedunculated, composite-tubular type; blood Vessels to gland include large branch of dorsal Vessel to approximate center of each gland. Holonephric, Vesiculate; ducts to body Wall near leVel of b.

Vascular system With Ventral trunk, single dorsal trunk, lateral Vessels in Vii–ix, esophageal hearts in x–xi, last pair (xi) free. Extra-esophageal Vessel from pharyngeal glands, along Ventral-lateral face of gizzard, esophagus back to calciferous glands; supraesophageal Vessel in x–xi.

OVaries, oVarian funnels free in xiii. Male sexual system metandric, testes and funnels in U shaped sac projected into xi–xii; seminal Vesicles tubular With lobulated edges, passing through xii–xiii, ranging posteriorly along intestine farther than lxxiV; Vasa deferentia long, looped from seminal Vesicles in xii, form dense zig-zag on body Wall en route to middle-anterior face of muscular round copulatory bulbs (1 mm diameter); bulbs extend oVer xVi–xViii. Copulatory bulbs With thin muscular outer layer, dense, delicate corrugated glandular inner surface With small lumen leading to male pore at approximate center of bulb connection to body Wall; transVerse muscle bands crossing oVer bulbs in the anterior and posterior face.

Remarks. Glossoscolex (Glossoscolex) r. nativus is close to Glossoscolex (G.) minor Zicsi & Czusdi, 1999 considering the small body (comp. Table 1). The differences betWeen G. (G.) r. nativus and G. (G.) minor are as folloWs, With the characteristics of the latter in parentheses: size 48–53 mm (24–45 mm), number of segments 169– 180 (198–231), clitellum saddle (annular), clitellum extension 1/4 xiV–1/2 xxV (xiV–xxiii), testis sacs U shaped sac in xi–xii (unpaired in xi), seminal Vesicles big tubular With lobulated edges until lxxiV (band until l), copulatory bulbs round (elongated).

G. (G.) r. nativus is close to G. (G.) r. riograndensis , the differences are the clitellum extension 1/4 xiV–1/2 xxV (xV–xxiii), shape of the calciferous grand flat bean (heart), the form of the copulatory bulbs round (round to oVal), size of copulatory bulbs 1.0 mm (1.7 mm).

G. (G.) r. nativus is close to G. (G.) r. pollulus , the differences are the size 48–53 (28–36), number of segments 169–180 (105–139), the clitellum extension 1/4 xiV–1/2 xxV (xV–xxiii), shape of the calciferous grand flat bean (small heart), the size of the copulatory bulbs 1.0 mm (0.7 mm) ( Table 1).

G. (G.) r. nativus has no storage of the sperm in the nephridia as G. (G.) r. riograndensis and G. (G.) r. pollulus .

Figures

FIGURE 1. Glossoscolex (Glossoscolex) riograndensis n. sp.. A, B. Glossoscolex (Glossoscolex) riograndensis riograndensis. C, D. Glossoscolex (Glossoscolex) riograndensis nativus n. ssp. E, F. Glossoscolex (Glossoscolex) riograndensis pollulus n. ssp. FM = female pOres; MP = male pOres; NF = nephridial pOres.