Dendrobaena pavliceki Szederjesi & Csuzdi, 2018

Szederjesi, Tímea, Dányi, László, Kaydan, Mehmet Bora & Csuzdi, Csaba, 2018, Contribution to the knowledge of the earthworm fauna of Turkey with description of three new species (Clitellata: Megadrili), Zootaxa 4496 (1), pp. 160-172 : 165

Dendrobaena pavliceki Szederjesi & Csuzdi , sp. nov.

( Figure 2 )

Holotype. HNHM /17260 1 adult ex., No. 40, Uzun Ahmetköy , Erzurum, NW of the village, pasture, N39°57.710' E41°24.461', 1855 m, leg. L. Dányi, M.B. Kaydan, 26.0 4.2015.

Paratypes. HNHM /17082 4 adult ex., NHMA 1 adult ex., locality and date same as that of the Holotype.

Derivatio nominis. The new species is named in honour of our colleague Tomáš Pavlíček (University of Haifa) who has collected rich earthworm materials all over the world and especially in the East Mediterranean.

Diagnosis. Length 36–48 mm, diameter 3–4 mm, setae distant. Colour pale with slight reddish hints on dorsum at the head. First dorsal pore in 5/6. Clitellum on 25, ½25–33, tubercles on 1/n30–½32. Male pores on 15, surrounded by glandular crescents. Nephridial pores irregularly alternate between b and above d. Three pairs of vesicles in 9, 11, 12, the last pair vestigial. Spermathecae two pairs in 9/10, 10/11, open near d. Calciferous glands in ½10–11. Hearts in segments 6–11, nephridial bladders simple, sausage-shaped.

External characters. Holotype 42 mm long and 4 mm wide. Number of segments 132. Paratypes 36–48 mm long and 3–4 mm wide. Number of segments 128–140. Colour pale with slight reddish hints in the head region. Prostomium tanylobous. First dorsal pore at intersegmental furrow 5/6. Setae distant. Setal arrangement behind clitellum: aa: ab: bc: cd: dd = 1.6:1.1:1.7:1:4.6 ( Fig. 2A ). Male pores on segment 15, surrounded by glandular crescents, protruding into the neighbouring segments. Nephridial pores irregularly alternate between setal line b and above d. Clitellum on 25, ½25–33. Tubercula pubertatis on 1/n30, 31–½32. Glandular tumescence on 10, 26– 27 ab ( Fig. 2B ).

Internal characters (based on holotype and two paratypes). Septa 6/7– 8/9 and 11/12 –12/13 slightly thickened, 13/14–14/15 thickened. Testes and funnels paired in 10–11. Three pairs of seminal vesicles in 9, 11 and 12, the last pair vestigial. Spermathecae two pairs in 9/10, 10/11 with external openings near setal line d. Calciferous glands in ½10–11. Last heart in 11, with a pair of extraoesophageal vessels in 12. Nephridial bladders simple, sausage-shaped. Crop in 15–16, gizzard in 17–18. Typhlosolis bilobate. Longitudinal musculature of pinnate type.

Remarks. The new species with tubercles in the region of 31–32 seems to be close to D. nevoi Csuzdi & Pavlíček, 1999 and D. cevdeti Szederjesi, Pavlíček, Coşkun & Csuzdi, 2014 . D. pavliceki differs from D. nevoi first of all in the position of the last pair of hearts (11 vs. 10), the presence of an extraoesophageal vessel, in its colour (pale with slight reddish hints at the head vs. overall dark red) and in the position of the clitellum (25, ½25–33 vs. 23, 24–33). The new species differs from D. cevdeti in the position of the clitellum (25, ½25–33 vs. ½24–34), in the presence of an extraoesophageal vessel and in the head (tanylobous vs. epilobous).

With lack of vesicles in 10 and vestigial vesicles in 12, D. pavliceki shows an incomplete metandric reduction.

Figures

FIGURE 2. Dendrobaena pavliceki sp. nov. A. Setal ratio. B. Ventrolateral view of the forebody, Cl = clitellum, Tb = tubercles, Mp = male pore.