Tritogenia Kinberg, 1867,

Nxele, Thembeka Clara, Plisko, Jadwiga Danuta & Ramongalo, Boipelo K., 2018, The first proandric species of Tritogenia Kinberg, 1867 from Botswana, Tritogenia talana sp. n. (Clitellata, Crassiclitellata, Tritogeniidae), Zootaxa 4496 (1), pp. 214-217: 215

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Tritogenia Kinberg, 1867


Genus Tritogenia Kinberg, 1867 

Brachydrilus: Benham 1888: 72  ; Michaelsen 1900: 462; Michaelsen 1918: 332; Stephenson 1930: 900; Reynolds & Cook 1976: 77.

Microchaetus: Michaelsen 1902: 33  ; Michaelsen 1907: 6; Michaelsen 1913: 431; Reynolds & Cook 1976: 77, 192.

Type species. Tritogenia sulcata Kinberg, 1867  .

Diagnosis. One oesophageal gizzard in 6–7. Four or five septa variably thickened, with thickened septa 6/7 attached externally to the gizzard. Dorsal blood vessel double in segments 4–10, 11, 12; double when crossing septa; single after segment 10, 11 or 12. Two or more small nephridia per segment (may be missing in some posterior segments). Testes and their funnels in the species earlier accredited to this genus in holandric arrangement, in presently described new species these are proandric. Description based on Plisko (2013).

Description. Annulation of pre-clitellar segments present; 1–3 usually simple, 4–9, 10 ringleted, with 2–4 ringlets annulated or not, with an external segmental subdivision; first ringlet may be longer than second. Postclitellar segments may be externally subdivided, or not. Setae: minute and irregularly placed; on preclitellar segments, may be recognizable under high magnification (120–250×) and only as a few pairs of ab or cd; sometimes ab seen only on a few segments. As from segment 9, ab may be associated with papillae. On postclitellar segments, setae easier to notice, although variably placed; in four pairs located mostly ventrally, with ab and cd paired very closely, or distantly, with aa 2–3 times as bc; dd nearly 0.6–0.7 of U. Occasionally cd not noticeable, when ab easily noted. Papillae and genital glands variably shaped, with segments on/in which they occur varying, occasionally associated with genital setae. Male pores occur variably in the area of tubercula pubertatis, although the pores are difficult to detect externally. Spermathecae small, present or absent, often deeply embedded in body tissue; variably shaped, paired or multiple; in the majority of species they are close to septa 11/ 12 and 12/13, although in some species may be located in more segments, sometimes up to six.












Tritogenia Kinberg, 1867

Nxele, Thembeka Clara, Plisko, Jadwiga Danuta & Ramongalo, Boipelo K. 2018


Benham 1888 : 72
Michaelsen 1900 : 462
Michaelsen 1918 : 332
Stephenson 1930 : 900
Reynolds & Cook 1976 : 77


Michaelsen 1902 : 33
Michaelsen 1907 : 6
Michaelsen 1913 : 431
Reynolds & Cook 1976 : 77