Dichogaster (Diplothecodrilus) silvestris ( Michaelsen, 1896 )

Csuzdi, Csaba, 2008, Earthworms from the Kivu Region, D. R. Congo with description of two new Dichogaster Beddard, 1888 (Oligochaeta: Acanthodrilidae, Ocnerodrilidae), Journal of Natural History 42 (33 - 34), pp. 2227-2241 : 2235-2236

publication ID

https://doi.org/ 10.1080/00222930802277616

persistent identifier

https://treatment.plazi.org/id/038287A1-F319-FFA4-6A49-FCADFC88C867

treatment provided by

Felipe

scientific name

Dichogaster (Diplothecodrilus) silvestris ( Michaelsen, 1896 )
status

 

Dichogaster (Diplothecodrilus) silvestris ( Michaelsen, 1896)

( Figure 5A–D View Figure 5 )

Benhamia silvestris Michaelsen 1896, p. 24 .

Dichogaster silvestris: Michaelsen 1900, p. 352 , Michaelsen 1905, p. 310. Dichogaster seriatospina Michaelsen 1912, p. 30 syn. nov.

Dichogaster anguana Michaelsen 1915, p. 209 syn. nov.

Dichogaster (Diplothecodrilus) seriatospina: Csuzdi 1995, p. 114 , Csuzdi 1996, p. 357. Dichogaster (Diplothecodrilus) anguana: Csuzdi 1995, p. 112 , Csuzdi 1996, p. 357. Dichogaster (Diplothecodrilus) silvestris: Csuzdi 1995, p. 114 , Csuzdi 1996, p. 357, Csuzdi 2000, p. 67.

Material examined

Dichogaster silvestris Holotype, ZMUH V295 , D.-O. Afrika, Ru-nsosro, leg. Stuhlmann.

New records. HNHM 3537 About HNHM , four exemplars , BMNH 1997.1468 1474 , seven exemplars , BMNH 1997.1524 1525 , two exemplars. D . R. Congo, Kivu Region , Ngungu, leg. Gasana N’Doli, 16 July 1973 , HNHM 3547 About HNHM , one exemplar , BMNH 1997.1509 1511 , three exemplars. D . R. Congo, Kivu Region , Katana, in stems of banana trees, leg. Gasana N’Doli, 5 August 1973 . HNHM AF/3552, two exemplars, BMNH 1997.1648 1650 , three exemplars. D . R. Congo, Kivu Region , Idjiri island, leg. Gasana N’Doli, 2 July 1973 . HNHM AF/3559, one exemplar, BMNH 1997.1677 1678 , two exemplars. D . R. Congo, Kivu Region , Lwiro, leg. Gasana N’Doli, 19 January 1973 . HNHM AF/3563, three exemplars, BMNH 1997.1493 1498 , six exemplars. D . R. Congo, Kivu Region , Ngungu, in the swamp, leg. Gasana N’Doli, 16 July 1973 . HNHM AF/3567, 10 exemplars, BMNH 1997.1652 1661 , ten exemplars. D . R. Congo, Kivu Region , Lwiro, leg. Gasana N’Doli, 16 February 1973 .

Diagnosis

Length 35–60 mm, D. 3–4 mm, no. of segments 85–112. Pigmentation brownish. First dorsal pore in 5/6. Clitellum 13–20, K 21, 21. ♀ 14 paired between setae a–a. Prostatic pores 17, 19, genital field oblong with rounded edges. Spermathecal pores 7/8, 8/9, ampoule of the spermatheca bulb-shaped with small distal part bearing a round and stalked diverticulum. The duct is slightly convoluted and much longer than the ampoule. Gizzard in 5/6, last pair of hearts in 12. Calciferous glands in 15–17 of equal size. Excretory system meroic with six meronephridia per side. Penial seta L. 4–5 mm, D. 0.02 mm, ectal third undulated, tip hook-shaped, ornamentation fine teeth.

Remarks

This species was described on a pre-adult specimen with not fully developed clitellum on segment 13–19. Dichogaster (Dt.) seriatospina Michaelsen, 1912 differs from D. (Dt.) silvestris only in the position of the clitellum therefore it must be regarded as a synonym of D. (Dt.) silvestris . Dichogaster anguana Michaelsen, 1915 was also described on a juvenile specimen; however, its spermathecae and the structure of the penial setae are identical to those of D. (Dt.) silvestris . It differs only in the length of the penial setae, which is because of the juvenile stage of the type specimen, therefore D. (Dt.) anguana is also a synonym of D. (Dt.) silvestris .

ZMUH

Zoological Museum, University of Hanoi

R

Departamento de Geologia, Universidad de Chile

HNHM

Hungarian Natural History Museum (Termeszettudomanyi Muzeum)

Kingdom

Animalia

Phylum

Annelida

Class

Clitellata

Order

Haplotaxida

Family

Octochaetidae

Genus

Dichogaster

Loc

Dichogaster (Diplothecodrilus) silvestris ( Michaelsen, 1896 )

Csuzdi, Csaba 2008
2008
Loc

Dichogaster (Diplothecodrilus) seriatospina:

Csuzdi Cs 2000: 67
Csuzdi Cs 1996: 357
Csuzdi Cs 1996: 357
Csuzdi Cs 1996: 357
Csuzdi Cs 1995: 114
Csuzdi Cs 1995: 112
Csuzdi Cs 1995: 114
1995
Loc

Dichogaster anguana

Michaelsen W 1915: 209
1915
Loc

Dichogaster silvestris: Michaelsen 1900 , p. 352

Michaelsen W 1912: 30
Michaelsen W 1905: 310
Michaelsen W 1900: 352
1900
Loc

Benhamia silvestris

Michaelsen W 1896: 24
1896
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