Okudrilus monticolus Csuzdi & Sherlock & Kouete & Doherty-Bone 2015, sp. n.
Creators: name: Csuzdi, Cs.
name: Sherlock, E.
name: Kouete, M. Talla
name: Doherty-Bone, T. M.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Crassiclitellata
Eudrilidae
Okudrilus
Okudrilus monticolus

description: Okudrilus monticolus Csuzdi & Sherlock sp. n.
Figs 5, 6
Etymology: From Latin monticolus (adj.) (mountain dweller) in reference to the type locality, the summit of Mount Oku.
Diagnosis: L: 150–190 mm, D: 5–7 mm. Colour reddish-brown, paler on ventrum. Head epilobous, setae closely paired. Clitellum annular on ½13–18. Prostatic pores in 17/18 a–a, spermathecal pores 12/13 between a–a, female pores on 14 close to 14/ 15 in d. Gizzard in 6, calciferous glands in 12, chylus-sacs in 10, 11. Testes in 11, vesicles in 12 long, running back to 45. Ovo-spermathecal apparatus paired, spermathecal ampulla elongated, apically continues in an ovo-spermathecal duct communicating with the ovarian capsule. The right and left ovarian duct interconnected by a small channel. Prostates without copulatory sacs. Simple penial setae 4 mm in length and 0.03 mm in diameter.
Description:
External characters:
Holotype: Preserved length 190 mm, diameter after clitellum 7 mm. Segment number: 274. Paratype: (aclitellate) 155 mm in length, 5 mm in diameter. Segment number: 268. Colour: Preserved dark reddish-brown between setae d–d, paler on ventrum. Head: Epilobous, ½ closed. Dorsal pores: Lacking. Setae: Closely paired, setal ratio aa:ab:bc:cd:dd = 11.2:2:8:1:36. Nephridial pores: Begin on segment 2, somewhat dorsal to setal line d.
Clitellum: Highly glandular, annular on segments ½13–18. Prostatic pores: Ventral on a spectacles-shaped papilla in 17/18, aligned with setal line a–a. Female pores: Small dots on 14, close to the intersegmental furrow 14/15 just below setal line d. Spermathecal pores: Paired on a spectacles-shaped papilla in intersegmental furrow 12/13 between setae a–a (Fig. 5).
Internal characters:
Muscular gizzard: In 6, well-developed, cylindrical. Septa: 6/7, 11/12 thickened, 7/8–10/11 highly strengthened. Calciferous glands: Paired in 12, large curved like a goat-horn, chylus-sacs in 10, 11. Dorsal blood vessel: Simple throughout. Hearts: In 9–11, large moniliform. Testes and sperm funnels: In 11 enclosed in an oval spermreservoir. Seminal vesicles: Long, running alongside the intestine from 12 to 45. Ovospermathecal apparatus: Ovaries in 13 enclosed in an ovarian capsule pendant from septum 12/13. This ovarian capsule medially continuing in an ovarian duct becoming undulating before joining the fertilisation chamber bearing a pendant ovisac. From the fertilisation chamber a straight oviduct leads to the female pore. The ovarian capsule laterally communicates with an ovo-spermathecal duct joining apically to the elongated and muscular spermathecal ampulla. The spermathecal ampulla joins a one-third as long spermathecal duct opening into the spermathecal pore in 12/13. The left and right ovarian ducts communicate by a small interconnecting channel (Fig. 6). Prostates: Long simple tubes without bursa copulatrix or bursa propulsoria. Penial setae: Simple with blunt tip, c. 4 mm long and 0.03 mm in diameter, almost smooth except for the apex which bears fine granulatiOn.
Holotype: CAMEROON: North-West Region, summit of the Oku Mt, 2867-2922 m, 15.vi.2012, T. DohertyBone (NHM 2013.441).
Paratype: Same data as Holotype (NHM 2013.442 1 preadult ex.).
Remarks: The new species differs from the other two Okudrilus species in the position of the spermathecal pores located in intersegmental furrow 12/13 (11 in O. sulcatus, 12 in O. nyosensis) and furthermore in the structure of the ovo-spermathecal apparatus. Habitat consists of loamy soil in high elevation (> 2000 m) sub-alpine grassland.
description: Published as part of Csuzdi, Cs., Sherlock, E., Kouete, M. Talla & Doherty-Bone, T. M., 2015, Four new earthworm species from the highlands of Cameroon with description of a new genus Okudrilus gen. n. (Oligochaeta: Eudrilidae & Acanthodrilidae), pp. 25-38 in African Invertebrates 56 (1) on pages 28-30, DOI: 10.5733/afin.056.0103, http://zenodo.org/record/7670419