Dichogaster (Diplothecodrilus) cagnii Cognetti, 1906

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 : 2228-2229

Dichogaster (Diplothecodrilus) cagnii Cognetti, 1906

( Figure 1A–D )

Dichogaster cagnii Cognetti 1906, p. 2 ; Cognetti 1909, p. 12.

Dichogaster (Diplothecodrilus) cagnii: Csuzdi 1995, p. 112 ; Csuzdi 1996, p. 356.

Material examined

Dichogaster cagnii Holotype, MZUT OL56 , Ruwenzori, Ibanda, Toro (1800 m), leg. Duca degli Abruzzi , July 1906. Dichogaster cagnii Paratype, MZUT OL54 , Ruwenzori, Lago Kianga, leg. Duca degli Abruzzi , July 1906. Dichogaster cagnii Paratype, MZUT OL 55 , Ruwenzori, Toro, leg. Duca degli Abruzzi , July 1906 .

New records. HNHM AF/3549, one exemplar, BMNH 1997.1605 – 1606 two exemplars. D . R. Congo, Kivu Region , between Kagundu and Gitovu, leg. Gasana N’Doli, 17 July 1973 . HNHM AF/3569, one exemplar, BMNH 1997.1563 – 1564 , two exemplars. D . R. Congo, Kivu , Butembo, in the stem of a banana tree, leg. Gasana N’Doli, 15 July 1973 . HNHM AF/3556, two exemplars, BMNH 1997.1485 – 1488 , four exemplars. D . R. Congo, Kivu , Mewa, leg. Gasana N’Doli, 17 July 1973 . HNHM AF/3554, three exemplars, BMNH 1997.1500 – 1505 , six exemplars. D . R. Congo, Kivu , Katana, in stems of banana trees, leg. Gasana N’Doli, 05 August 1973 . HNHM AF/3562, five exemplars, BMNH 1997.1596 – 1604 , nine exemplars. D . R. Congo, Kivu , Lwiro, leg. Gasana N’Doli, 10 May 1973 . HNHM AF/3546, five exemplars, BMNH, 1997.1583– 1592, 10 exemplars. D. R. Congo, Kivu , river Mululu, leg. Gasana N’Doli, 15 July 1973 .

Diagnosis

Length 30–63 mm, D. 2–2.5 mm, no. of segments 110–120. Pigmentation brownish. First dorsal pore in 5/6. Clitellum 13–20. ♀ 14 paired before setae a–a. Prostatic pores 17, 19, genital field oblong. Spermathecal pores 7/8, 8/9, spermathecae with elongated ampoule, and an equally long duct. The distal part of the ampoule bears a round and stalked diverticulum. Gizzard in 5/6, last pair of hearts in 12. Calciferous glands in 15–17, their size slightly increasing backwards. Excretory system meroic with five or six meronephridia per side. Penial setae are of two types, larger L. 1.1– 1.3 mm, D. 0.02 mm, tip sharply pointed, ornamentation strong spines. Smaller penial setae L. 0.60–0.65 mm, D. 0.01 mm, tip rounded, ornamentation lacking.

Remarks

This species was described by Cognetti (1906) with a unique type of penial setae, therefore previously I placed it in the congica species group ( Csuzdi 1996). An examination of the type material ( MZUT OL 54, OL 55) revealed that the species possesses two different types of penial setae and consequently it belongs in the bolaui species group.

Figures

Figure 1. Dichogaster (Dt.) cagnii. (A) Ventral part of the clitellar region; (B) larger penial seta; (C) smaller penial seta; (D) spermatheca. St, spermathecal pores; Pr, prostate pores.