Pheretima lamaganensis
sp. nov.
( Figure 4
View Figure 4
)
Type material
Holotype: Clitellate (NMA 04376): Philippines, Mountain province,
Mt. Lamagan
(17 ◦ 07.34 ′ N, 121 ◦ 10.20 ′ E), 1980 m a.s.l., in soil of montane forest, 4 April 2001, S. W. James coll.
GoogleMaps
Paratype: 1 clitellate (NMA 04382): Same data as for holotype
GoogleMaps
.
Other material
Same data as for holotype, 1 semi-clitellate, 5 aclitellates.
Etymology
The species is named after its type locality.
Diagnosis
Three pairs small ventral spermathecal pores in 6/7–8/9, 0.27–0.28 circumference apart, spermathecae two pairs in VII, one pair in VIII; copulatory bursae openings 0.21–0.22 circumference apart, openings flanked by internal anterior, posterior circular pads, penis a low ridge with pore on apex; small-bodied worms with more setae in VII than in XX, vestigial typhlosole.
Description
Brown dorsal pigment. Dimensions 46–55 mm by 3 at segment X, 3–3.2 mm at XXX, 2.5–3 mm at clitellum, segments 84–93; body circular in cross-section. Setae numbering 43–44 at VII, 23–30 at XX; 7–10 between male pores, dorsal setae more widely spaced, setal formula AA:AB:YZ:ZZ = 2.5:2:3.5:6.5 at XIII. Clitellum annular XIV–XVI; setae invisible externally.
First dorsal pores 11/12. Three pairs small ventral spermathecal pores in 6/7–8/9 at 9th setal lines (counted at IX) deep in furrows, ventrolateral, 0.27–0.28 circumference apart; distance between spermathecal pores around 2.5–2.6 mm. Female pore single in XIV; 0.3–0.4 mm openings of copulatory bursae paired in XVIII at 7th setal lines, ventrally placed, 0.21–0.22 circumference apart ventrally; distance between openings 2.1 mm. Genital markings lacking.
Septa 5/6–7/8 thin, 8/9 very thin, 9/10 absent, 10/11–13/14 thinly muscular. Gizzard in VIII, intestine begins in XVI, small paired lymph glands from XXVII along dorsal vessel; intestinal caeca simple originating in XXVII, and extending anteriorly about to XXV, finger-shaped sac; typhlosole vestigial from XXVII. Hearts in X–XIII oesophageal.
Ovaries and funnels in XIII, spermathecae three pairs in VII–VIII; in VII one pair behind septum 6/7, one pair in front of 7/8, one pair in VIII, with nephridia on ducts; spermatheca with short ovate ampulla, muscular narrow duct shorter than ampulla; iridescent small diverticulum chamber egg-shaped on very short stalk. Male sexual system holandric, testes and funnels in ventrally paired sacs in X, XI. Seminal vesicles two pairs in XI, XII, dorsal lobes elongate, deep in dorsal clefts, prostates in XVII–XVIII, one or two lobes, weakly muscular short ducts, ducts pass in front of anterior faces of copulatory bursae, bend 90 ◦ to posterior, enter medial upper side of copulatory bursae without coelomic glands; copulatory bursae openings flanked by anterior, posterior circular pads; penis a low ridge with pore on apex.
Remarks
Pheretima lamaganensis
sp. nov. belongs to the
dubia
group in Sims and Easton (1972), which is composed of five long known species,
P. philippina Rosa, 1981
,
P. callosa Gates, 1937
,
P. dubia Horst, 1893
,
P. korinchiana Cognetti, 1922
and
P. poiana Michaelsen, 1913
. Six more species are now known from the Philippines; three of them reported here, two in Hong and James (2010) and one in an unpublished manuscript on earthworms from the Kalbaryo peninsula of Luzon.
Pheretima lamaganensis
sp. nov. is small, with body length 46–55 by 2.5–3.0 mm, and 84–93 segments, but
P. poiana
and
P. philippina
are large worms, greater than 180 mm in length and more than 110 segments.
Pheretima poiana
has a sausage-shaped spermathecal diverticulum rather than ovate as here, and the prostatic duct is in an S-curve.
Pheretima dubia
has a spirally bent diverticulum unlike any described here.
Pheretima callosa
is large bodied (330 × 16 mm), and has at least twice as many setae per segment as
Pheretima lamaganensis
sp. nov., as well as having pseudovesicles in XIII and looped spermathecal diverticula.
Pheretima callosa
is from the Philippines, Luzon Island, Benguet Province at 2130 m in oak forest, so is geographically the nearest neighbour among the
dubia
group.
Pheretima philippina
is from Cebu, in the central Philippines, and has a thicker spermathecal duct, a longer diverticulum, and a shorter prostatic duct than
P. lamaganensis
sp. nov.
Pheretima korinchiana
is also much larger (90–180 mm), has violet-brown dorsal pigment, 12 setae between the male pores, laterally placed spermathecal pores, and a club-shaped diverticulum on an undulating or spiral stalk.
Pheretima lamaganensis
sp. nov. shares the locations of the spermathecae (two pairs in VII, one pair in VIII) with
Pheretima julkai
sp. nov. and two
dubia
-group species from Balbalasang, Kalinga, Luzon ( Hong and James 2010). Differences from
P. banaoi Hong and James, 2010
from Kalinga are (characters of the Kalinga worm given) 25–35 setae in VII, 46 setae in XX, typhlosole present, spermathecal pores 0.18 circumference apart, and septum 8/9 absent.
Pheretima balbalanensis Hong and James, 2010
, another
dubia
-group member from Kalinga, differs by spermathecal location and numbers of setae.
Pheretima lamaganensis
sp. nov. differs from
Pheretima julkai
sp. nov. by pigmentation colour, separation of spermathecal pores (0.28 and 0.22 circumference apart respectively), and the numbers of setae. The number of setae in VII for
Pheretima julkai
sp. nov. is smaller than for
Pheretima lamaganensis
sp. nov. (29–31 versus 43–44), but the setal number in XX is greater, with 51–54 for
Pheretima julkai
sp. nov. versus 23–30 for
Pheretima lamaganensis
sp. nov.
