Dichogaster (Eutrigaster) oraedivitis, Cognetti, 1904

Sherlock, Emma, Lee, Stewart, Mcphee, Sally, Steer, Mark, Maes, Jean Michel & Csuzdi, Csaba, 2011, The first earthworm collections from Nicaragua with description of two new species (Oligochaeta), Zootaxa 2732, pp. 49-58 : 51-52

Eutrigaster (Eutrigaster) oraedivitis Cognetti, 1904

( Fig. 2 )

Eutrigaster oraedivitis Cognetti, 1904: 2 , Cognetti 1905a: 36. Dichogaster oraedivitis: Michaelsen 1912: 120 .

Eutrigaster oraedivitis : Sims 1987: 432.

Eutrigaster (Eutrigaster) oraedivitis : Csuzdi 1996: 359.

Non Dichogaster oraedivitis: Talavera & Bacallado 1983: 6 , Talavera 1992: 346. Dichogaster kepo Righi & Merino, 1987: 540 . syn. nov.

Material. BMNH 2010.75, 2010.92. Locality: EJ, 2 ex. (micro).

Diagnosis. L. 79–83 mm, D. 4–5 mm. No. segments: 132–146. Pigmentation pale with praeclitellar reddish hints on dorsum. First dorsal pore in 12/13. Clitellum 13–20. Ƥ 14 paired, in between a–a. Prostatic pores 17, 19. Spermathecal pores 7/8, 8/9, spermathecae with egg-shaped ampoule, and a duct which entally bears a racemose diverticulum. A thick proventriculus in 5, gizzards in 6–7, last pair of hearts in 12. Meronephridia 5-6 on each side, penial setae lacking.

Remarks. This is the first report of E. (E.) oraedivitis , the generotype of Eutrigaster, since the original description. This new material from Nicaragua completely agrees with the description of the Costa Rican types by Cognetti (1904). Dissecting the animal, the large shining proventriculus in 5 was quite obvious and it is easy to understand why Cognetti regarded Eutrigaster as having three gizzards.

In 1987, Righi & Merino described a new species, Dichogaster kepo , from Costa Rica. Their description and furthermore the figures of the male field and the spermathecae are highly similar to those of E. oraedivitis . They seemingly overlooked the existence of E. oraedivitis , which had even been revised in the very same year by Sims (1987), and they did not mention it among the possible similar species of D. kepo in their paper.

Figures

FIGURE 2. Eutrigaster (Eutrigaster) oraedivitis Cognetti, 1904. A. Ventral view of the clitellar region, B. Spermatheca. fp = female pores, pp = prostatic pores.