Alluroides pordagei Beddard 1894
Creators: name: Jamieson, Barrie G. M.
name: Fragoso, Carlos
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Alluroidida
Alluroididae
Alluroides
Alluroides pordagei

description: Alluroides pordagei Beddard 1894 (see Fig 8)
Alluroides pordagei Beddard, 1894: 244, Fig. 4, 5.
Alluroides pordagei Beddard, Michaelsen 1900: 106–107; Brinkhurst 1964: 527. Jamieson 1968: 75, Fig. 15 –18; Brinkhurst & Jamieson 1971: 713–714, Fig. 14.3D, E.
? Alluroides tanganyikae Beddard. Michaelsen 1913: 7, Pl. XIX, Fig. 9; 1914 a: 89; 1914 b: 165, Pl. V. Fig. 13; 1915: 29; 1935: 36; 1936: 37 (part.)
(Non) A. tanganyikae Beddard 1906.
Length 25–48 mm, width 1.0 mm, segments 202. Prolobous. Form approximately cylindrical throughout, anterior segments at least biannulate with the transverse furrow shortly postsetal. Lateral line in bc, nearer to b than to c. Anus terminal. Ventral setal couples of XIII absent at maturity; all setae sigmoid, with approximately central, well–developed node; none modified as genital setae. Outer setal couples dorsal, dd:u =ca 0.2. Clitellum annular, XII–XVI. Male pores a pair precisely lateral, or slightly ventrolateral, nearer to b than to c lines in the setal arc of XIII, each surrounded by a circular tumescence almost filling the segment longitudinally. Female pores in 13/14 directly in line with the male pores, inconspicuous. Spermathecal pore paired or single, dorsal and anterior in VIII, in the type paired near the dorsal midline.
Septa 4/5 (the first clearly developed), 9/10 exceptionally strongly thickened, 10/11 thin and attenuated, 11/12 and (though less so) 12/13 moderately thickened, the succeeding septa thin. Septal glands posterior in V– IX? Nephridia commencing in XII–XVI. Pharynx anterior to septum 4/5. Intestine commencing in XIII, internal epithelium with tall cilia; oesophagus similarly ciliated in XII in front of the oesophageal valve; ciliation not certainly present further anteriorly. Brown–granuled chloragogen cells commencing (always?) at 1/2 IX. Dorsal blood vessel large and adherent to the gut in XIII posteriorly; slender and freer anteriorly to this. Hearts (posterior commissural) very tortuous extending posteriorly into XI(XII?). Septum 10/11 bulging posteriorly far into XI to form a wide–mouthed (unpaired?) seminal vesicle. Muscular tubes of the atria forming slender somewhat coiled tubes extending from XIII into XIV or as far as XVI and widening immediately before opening at the male pores. With the exception of the terminal ectal chamber each tubular atrium surrounded by a sheath of unicellular prostate cells, which approximately doubled the width of the apparatus, the cells communicating with the atrial lumen by minute ductules. Vasa deferentia running in the glandular prostatic duct and presumably entering the atrium entally. Ovaries and funnels in XIII. Oviduct penetrating the body wall immediately behind septum 13/14. Female gonadial cells, at maturity, in XIII–XXI, probably in ovisacs. Spermatheca single or paired, dorsally in VIII.
Distribution. Kenya: swamp 4 miles inland from Mombasa (Type locality, Beddard 1894); lower forest region of Mt. Kenya at 2400 m (Michaelsen 1914 a, b; Michaelsen 1915, as A. tanganyikae); Kahawa stream, Athi River tributary, near Nairobi, collector B.G.M. Jamieson, 11 Dec. 1967. Republic of the Congo: Mulongo, Niunzu; Albertville (Michaelsen 1935); Leopoldville (Michaelsen 1936). Rhodesia: swampy earth, Zambezi River, near Victoria Falls (as A. tanganyikae, Michaelsen 1913).
Remarks. Because of the uncertain status of Michaelsen’s material this account (from Jamieson 1968) was derived solely from Beddard’s type –series, and his description, and incorporated results of examinations by Brinkhurst (1964) and Jamieson (Athi River material).
The extreme septal thickening, and its distribution, now emerge as diagnostic features of A. pordagei (condition still unknown, however, in A. tanganyikae s. Beddard and s. Michaelsen). Intraspecific variation from a paired to a single spermatheca (in VIII) is confirmed and reinforces Brinkhurst’s conclusion (1964) that A. tanganyikae s. Michaelsen (spermatheca single in VIII), but not s. Beddard (spermatheca single in IX), should be included in A. pordagei.
The decision by Michaelsen (1936) to recognize three subspecies, pordagei, tanganyikae and congicus, has not been followed here though it still deserves consideration. A. tanganyikae has been retained as a distinct species but recognition of congicus, from Leopoldsville, as a subspecies appears reasonable. Michaelsen distinguished it by the spermatheca with a thin–walled, sac–like ampulla and sharply demarcated muscular duct. He added that congicus was 90–100 mm long, with ca 210 segments, the largest form, whereas the typical subspecies was 22 mm long, the smallest form, while tanganyikae had a length of 45 mm, with ca 150 segments, intermediate between the two other forms. Some of these figures no longer hold.
description: Published as part of Jamieson, Barrie G. M. & Fragoso, Carlos, 2024, A monograph of the Oligochaete family Alluroididae, pp. 401-435 in Zootaxa 5529 (3) on pages 417-419, DOI: 10.11646/zootaxa.5529.3.1, http://zenodo.org/record/14022623