Pheretima rugosa, James, 2004

James, Samuel W., 2004, New Species Of Amynthas, Pheretima And Pleionogaster (Clitellata: Megascolecidae) Of The Mt. Kitanglad Range, Mindanao Island, Philippines, Raffles Bulletin of Zoology 52 (2), pp. 289-313 : 300

Pheretima rugosa , new species

( Figs. 2F, G )

Material examined. – Holotype - adult ( NMA 003980 ) Philippines, Mindanao Island, Bukidnon Province, Mt. Kitanglad Range , 8 9' N, 124 44' E, 1800 m. elevation, coll. D. Balete, no date.

Paratype – adult ( FMNH 011065 ) Philippines, Mindanao Island, Bukidnon Province, Mt. Kitanglad Range , 8 9' N, 124 44' E, 1800 m. elevation, coll. D. Balete, no date .

Etymology. – The species is named for broad corrugated pad adjacent to the spermathecal pores.

Description. – Dark brown dorsal pigmentation, body 70 x 2.8 mm (vii), 3.2 (x), 3.4 mm (xxv), 92 segments, six regenerated; body cylindrical in cross-section. First dorsal pore 11/12, spermathecal pores paired in 7/8, 0.20 circumference apart, female pore single in xiv, openings of copulatory bursae paired in xviii, 0.15-0.16 circumference apart between 5 th and 6 th setal lines, 0 setae between openings. 8-10 setae closely spaced on ventrum, 1.5-2X more widely spaced elsewhere around post-clitellar segments; some setae missing from vii; 18, 24 setae on vii, 36 on viii, 30, 32 setae on xx; no dorsal gap in vii; in xx ZZ: YZ = 2.0, no ventral gaps. Clitellum annular xiv-xvi; ventral surface of vii, anterior 2/3 of viii thickened to form a broad corrugated pad extending laterally just beyond spermathecal pores ( Fig. 2F ).

Septa all thin, all anterior septa present. Nephridia in dense tufts on anterior faces of 5/6, 6/7; those of intestinal segments pre- and post-septal at septum-body wall junction. Large gizzard in viii, esophagus deeply pouched, vascularized, with vertical lamellae x-xiii, pebble-grained internally xiv, xv, valvular xvi; intestinal origin xvii, simple caeca originating in xxvii, extending forward to xxiv, ventral margins smooth; typhlosole xxvii-lx, lxv, simple fold approximately 0.4-0.5 lumen diameter: 20 longitudinal vessels in intestinal wall.

Hearts x-xiii esophageal, commissural vessels vi, vii, ix lateral; viii to gizzard; supra-esophageal vessel x-xiii; extra esophageal vessel joins ventral esophageal wall in x, receives efferent parieto-esophageal vessel in xiii.

Ovaries and funnels free in xiii, spermathecae paired, preseptal in vii with nephridia on ducts; each spermatheca with rounded ampulla, single stalked diverticulum terminating in sausage-shaped receptacle, stalk passing through 7/8 to place diverticulum in viii ( Fig. 2G ). Male sexual system holandric, testes and funnels enclosed in paired sacs in x, xi; sacs separate; seminal vesicles large in xi, xii, each with dorsal lobe; vasa deferentia free from body wall en route to ental end of prostatic ducts, thick and muscular xiii-xviii; each prostate racemose, occupying xvi-xx, bilobed, each lobe with two or three minor lobes, stout muscular duct entering center of ovate copulatory bursa in xviii; coelomic surfaces of copulatory bursae muscular, lacking glandular or other projections; interior of outer bursa wall with one long pad lateral to opening, two pads medial to opening; penis present.

Remarks. – The spermathecae are preseptal in vii and the diverticulum is in viii, suggesting that the spermathecae migrated forwards one segment while retaining the pore location at 7/8. It has three pads in the copulatory bursae rather than two as in P. diesmosi and has true penes. Like P. quincunxia , P. diesmosi and P. rubida , P. rugosa has a distinct thickening of the epidermis on vii and viii. The extent of epidermal thickening in vii and viii is greatest in P. quincunxia and P. rugosa , minimal in P. diesmosi , and confined to narrow bands in P. rubida . Pheretima quincunxia and P. rugosa have the greater extent of thickening in viii and vii, respectively.

Figures

Fig. 2. Spermathecae, and ventral views showing spermathecal pores, female pores, and male pores of Pheretima quincunxia (A, B), C: setal distribution pattern of P. quincunxia with mid dorsal line of dorsal pores at center, P. diesmosi (D, E), P. rugosa (F, G), and P. monoporata (H, I, with spermatophore). Symbols: fp, female pore(s); mp, male pores; sp, spermathecal pores.