Filenchus microdorus
(Chawla, Prasad, Khan & Nand, 1969) Siddiqi, 1986
Syn.: Tylenchus (Lelenchus) microdorus Chawla, Prasad, Khan & Nand, 1969
Photo Gallery- Konza Prairie

Dimensions:  (specimens fixed in 4% formalin solution and mounted in glycerine).
Females (2):  L = 0.4-0.5 mm; a = 26-34; b = 4.5-6.0; c = 4.2-5.8; V = 65-71; spear = 6-7um.
Males (20):  L - 0.38- 0.48 mm; a = 29-37; b = 5-6; c = 4-6; T = 32-38; Spicule = 12-14um; Gubernaculum = 3-4um.

Holotype (Female): L = 0.42 mm; a = 31; b = 5.7; c = 4.8; V = 69.
Body slender, ventrally arcuate, tapering towards both ends.  Cuticle finely striated; lateral field marked with 4 incisures, measuring 1/4 of body width.  Head continuous, rounded, striations not seen; amphidial openings about 1/4th of head-width across.  Excretory pore located posterior to nerve ring 72um from the anterior end.  Buccal spear 6.6um long with small rounded knobs, the former measuring 1/11th of oesophageal length (1/10th to 1/12th in paratypes); opening of dorsal oesophageal gland 2.5um posterior to spear-base; oesophagus typical of the genus; median bulb oval, located anterior to middle of oesophagus dividing it in ratio of about 2:3; basal bulb pyriform, cardia present.  Ovary single, anteriorly outstretched;  oocytes in single row.  Post-vulval sac small, about 3/4th of corresponding body width in length.  Rectum and anus distinct.  The former measures about 3/4th of corresponding body width in length.
Allotype (Male):  L = 0.45; a = 33; b = 6; c = 5.5; T = 35
Testes single anteriorly outstretched; spicules paired, similar, ventrally arcuate, measuring about 13um in length (along median curved line); gubernaculum 4um long.  Bursa small, measuring about 1/6th of tail-length.  Tail gradually tapering to an acute terminus, measuring about 9 times the anal body-diameters in length.

Type habitat:  Soil about the roots of Rye (Brassica juncea).

Type locality:  Kanpur, U.P., India

Diagnosis and relationship:  T. (L.) microdorus n. sp. comes close to T. (L.) minutus (Cobb, 1893) Andrassy, 1954 T.(L.) aberrans Altherr, 1952.  It can readily be distinguished from T. (L.) minutus by having a long body (L = 0.37-0.4 in T.(L.) minutus), small spear (spear = 8-10um in T.(L.) minutus), more posteriorly located excretory pore (excretory pore anterior to nerve ring in T. (L.) minutus) broad Lateral field (1/5.3-1/6.3 in T. (L.) minutus), and wide amphidial apertures.  From T. (L.) aberrans it differs in having a distinct bursa and gubernaculum (Bursa and Gubernaculum absent in T. (L.) aberrans).
(Description- Chawla, Prasad, Khan & Nand, 1969)