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