Butlerius Goodey, 1929

Genus Butlerius Goodey, 1929 View in CoL

Syn. Butleroides Lordello & Zamith, 1959

Butleriellus Meyl, 1960 View in CoL

Mesodiplogasteroides Khera, 1969 View in CoL

Parabutlerius Andrássy, 1984 View in CoL

Monobutlerius Ebsary, 1986 View in CoL

(Continued)

The key characters for differentiating the species of Butlerius are given hereunder

1 – Female gonad prodelphic ............................................................................................................ 2

– Female gonad amphidelphic ...................................................................................................... 5

2 – Stoma with subventral armature ............................................................................................... 3

– Stoma without subventral armature ........................................................................................ 4

3 – Stoma with one dorsal & eight small teeth (two subventral, two smaller ventrolateral multi-teeth sets), gubernaculum long sickle-shaped, post-uterine duct cuticularized, genital sensilla, six pairs; two precloacal and four postcloacal ............................................... ........................................................................................................................ B. macrogubernaculum

– Stoma with one subventral tooth and denticles, gubernaculum triangular, triangle distally pointed, post-uterine duct not cuticularized, genital sensilla nine pairs; three precloacal and six postcloacal............... ....................................... B. monhystera

4 – Spicules very long, arcuate, fused for the distal two thirds of their length, gubernaculum proximally knobbed, genital sensilla nine pairs....................... B. macrospiculum

– Spicules distally hooked, gubernaculum keel-like; keel distally rounded, genital sensilla nine pairs .................................................... .................................................. B. degrissei

5 – Stoma with one dorsal tooth, subventral armature may be present or absent. .... 6

– Stoma with two dorsal tooth and two subventral teeth ...................................... B. okai

6 – Stoma without subventral armature ........................................................................................ 7

– Stoma with subventral armature ............................................................................................... 8

7 – Stoma 23–24 µm long .................................................................................................. B. demani

– Stoma 12–13 µm long... ........................................ ....................................... B. indicus sp. n.

8 – Procorpus lumen zipper-like.. ..................................................................................................... 9

– Procorpus lumen simple. ............................................................................................................ 10

9 – Sclerotised pieces in vagina............. .................... ................... B. sclerovaginatus

– Vagina without sclerotisation................ ........................ ....................... B. micans

10 – Large setose cephalic papillae, linear gubernaculum.. .................................................. 11

– Minute cephalic papillae, more expanded gubernaculum.. ........................................ 12

11 – Genital sensilla nine pairs, four unicellular uterine glands present... .. .. B. butleri

– Genital sensilla eight pairs, uterine glands absent.................................... B. canadensis

12 – Genital sensilla 11 pairs, ad more than one cloacal diam. posterior to cloaca, pd at the level of v7, rectal gland absent. ..................................... .................................... B. gerlachi

– Genital sensilla nine pairs, ad just posterior to cloaca at the level of v4, pd far posterior to v7, rectal gland present.............................................................................. B. longipyge