Pheretima kalbaryoensis, new, 2011

Hong, Yong & James, Samuel W., 2011, New Species Of Pheretima, Pithemera, And Polypheretima (Clitellata: Megascolecidae) From Kalbaryo, Luzon Island, Philippines, Raffles Bulletin of Zoology 59 (1), pp. 19-28 : 21-22

Pheretima kalbaryoensis, new species

( Figs. 2 A–B)

First dorsal pore in 11/12, four pairs of spermathecal pores in 5/6–8/9, conspicuous, distance between spermathecal pores 4.5 mm (0.23 circumference ventrally apart). Female pore single in xiv, on 0.6 mm oval, 1.0 mm openings of copulatory bursae paired in xviii, distance between male pores 3.6 mm (0.17 circumference ventrally apart). Genital markings absent.

Septa 5/6–7/8 thick, 8/9, 9/10 very thin, 10/11–12/13 thick with muscle, 13/14 thin. Gizzard in viii, intestine enlarged from xv, small paired lymph glands from xxviii along dorsal vessel; intestinal caeca simple, originating in xxvii, and extending anteriorly about to xxiv or xxiii, each consisting of a large finger-shaped sac; typhlosole low simple fold from xxvii, 32 longitudinal blood vessels in intestinal wall from xxviii. Hearts x–xiii esophageal; ix lateral, left side large.

Ovaries and funnels in xiii, spermathecae in vi–ix with nephridia on spermathecal ducts; spermathecae with small ampulla, diverticulum sausage-shaped, as long as ampulla or longer than ampulla. Male sexual system holandric, testes and funnels in ventrally paired sacs in x, xi. Seminal Material examined. – Holotype: One clitellate ( NMA 4386 ), Philippines, Ilocos Norte Province, Pagudpud , Kalbaryo (18°33.65'N 127°57.83'E), 239 m, litter layers in the forest, coll. Y. Hong, A. Castillo & M. Levi, 14 Mar.2001, 3 Jun.2001.

Other material: 2 aclitellates, same data as for holotype ( NMA) .

Diagnosis. – Four pairs of spermathecal pores in 5/6– 8/9; spermathecal pores and male pores 0.23 and 0.17 circumference ventrally apart, respectively, typhlosole present, septa 8/9/10 present.

Etymology. – The species is named after its type locality, Kalbaryo in Philippines.

Description. – Dark brown dorsal pigment,1/3 segment length white stripes on setal rings, narrowing dorsally. Dimensions 210 mm (aclitellate 145 mm) by 6.2 mm at segment x, 7.0 mm at xxx, 6.7 mm at clitellum, segments 93; body cylindrical in cross-section. Setae numbering 38 at vii, 49 at xx; 7 between male pores; setae slightly more widely spaced dorsally, setal formula AA:AB:YZ:ZZ = 6:2:3:6 at xiii. Clitellum annular in xiv–xvi; setae invisible externally.

vesicles two pairs in xi, xii with dorsal lobes. Prostates in xvii– xviii, two lobes, smooth duct entering center of the copulatory bursae without coelomic glands, penis small, male pore just below tip; copulatory bursa openings flanked by anterior and posterior large flat circular pads.

Remarks. – The species also keys to the darnleiensis group in Sims & Easton (1972). P. darnleiensis has fewer setae per segment, shorter body length, ampulla shorter than diverticulum and first dorsal pore in 9/10. The present species is larger than Pheretima margaritata , new species, and has more setae per segment, more closely placed male and spermathecal openings, septa 8/9/10 present, and a sausage-shaped diverticulum rather than a diverticulum with an egg-shaped seminal chamber.

Figures

Fig. 2. Pheretima kalbaryoensis, new species: A, ventral view; B, spermathecae and diverticulum. Scale bars = 5 mm (A), 1 mm (B).