Sectonema tran s silvanicum n. sp, Popovici, 1978

Popovici, Iuliana, 1978, New Nematode Species (Dorylaimoidea) From Romania, Nematologica 24 (4), pp. 404-411 : 406-408

Sectonema tran s silvanicum n. sp .

( Fig . 2, A-F)

Measurements:

Holotype (female): L = 5.59 mm; a = 48; b = 5.2; c = 100; V = 11.35313.7.

Allotype (male): L = 5.58 mm; a = 43.5; b = 4.8; c = 106; T = 16.

Paratypes (2 males): L = 4.17-4.78 mm; a = 47-51; b = 4-4.5; c = 89-93.

Description

Body long cylindroid, tapering anteriorly to a well offset lip region, with the posterior third slightly curved. Cuticle smooth 7 [Lm thick (3-7 jum) at odontostyle level, and mid-body, and 15 gm (9-12.5 jum) on tail; criss-cross striation. Lateral chords are one fifth (female) to one eighth (male) body width near middle. Ventral body pores about 55, irregularly distributed between base of mural tooth and end of oesophagus. Lateral body pores about 88, observed with difficulty.

Lip region 25 pm wide (25-26 item), distinctly off-set, about one fourth the body width at the base of the oesophagus. Lips almost rounded, three times as wide as high. Amphid 10 gm, occupying about two fifth the width of the head. Odontostyle a mural tooth, 13 gm long (12.5- 1 3 half as long as the width of the lip region. Pharyngeal cavity 41.5 /,tm long. Oesophagus is slender anteriorly (2/5) the basal expanded portion occupies 57glo (57-63) of the total oesophageallength. Cardia conoid, one fourth the body diameter. A flattened disc is present between the base of the oesophagus and the intestine. Nerve ring at 225 pm (205-237,¡.tm) from head end.

Female: Reproductive system amphidelphic, ovaries reflexed to reach of their length from the vulva (52-62% o). Oocytes in a single row; vulva transverse, vagina extending into the body about two fifth of its width. Egg 184 X 76 pin one and a half times the corresponding body width. Sperms 5 -6 ttm, oval, present in the uteri. Prerectum 216 gm long, about three times the anal body width, rectum 57 ¡.tm long, slightly shorter (0.8) than the anal body width. Tail 56 gm long, bluntly rounded to hemispherical, shorter than anal body width (0.8), with two pairs of caudal papillae.

Male: Spicules 113,¡.tilllong (ioo-1 14 ttm) measured along the curved median line; lateral guiding pieces 27 um (25- 27.5 gm) long, characteristic. Supplements consisting of an adanal pair and a ventromedian series of six (6-7), beginning one and one-fourth spicule length anterior to the anus, irregularly spaced, 22-525 μm apart (15- 38,gm). Prerectum begins within the range of the supplements (100-172 ttm long). Tail 50:/Am long, bluntly rounded.

Type specimens: Holotype female and allotype male deposited in " Grigore Antipa " Museum Collection , Bucharest , Romania ; one paratype male deposited at Plantenziektenkundige Dienst, Wageningen, the Netherlands, one male with the author.

Type habitat and locality: Collected from a brown soil, basically mull-moder, in a beech-spruce fir forest in Vladeasa Mountain Mass ( Western Carpathians ), July 1974, and June, August 1975.

Differential diagnosis.: According to Heyns' table (1965) the new species comes closest to S. ba. rilgoodeyi Heyns, 1965 from which it differs in the thinner cuticle, shorter odontostyle, rectum and prerectum, more lateral and ventral body pores, fewer ventromedian supplements, irregularly spaced. From S. macro. rpiculum (Altherr, 1955) Heyns, 1965 it differs in the relatively narrower lip region, shorter odontostyle, hemispherical tail, fewer and not mammiliform ventromedian supplements. The new species differs also from S. heyya. ri Altherr, 1968 in having a smaller and stouter body, longer tail, shorter odontostyle, fewer lateral body pores. It differs from S. procta Jairajpuri & Baqri, 1966 in the longer tail, egg and prerectum, shorter rectum, fewer lateral and ventral body pores.

Figures

Fig. 2, A-F. Sectonematranssilvanicumn. sp. A- Head end; B - Cardia region; C- Anterior sexual branch; D - Female tail, rectum and prerectum; E - Female tail; F- Posterior region of male.