AnimaliaacceptedsubspeciesAccepted

Alluroides brinkhursti abyssinicus

Jamieson, 1968

GBIF:245596634

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ABOUT

Descriptions(2)

Septa 4 / 5 – 12 / 13 fairly strong, with the exception of 10 / 11 which is very thin and is evaginated posteriad to form a bulbous seminal vesicle; 7 / 8 – 9 / 10 the thickest; 3 / 4 imperfect and very delicate; 13 / 14 – 15 / 16 thin but not as delicate as the succeeding septa. 13 / 14 is deflected posteriad by the atria so as almost to touch 14 / 15 and is prolonged backwards to XVIII as the (unpaired?) ovisac. Chromophil glands extend posteriorly to the posterior wall of VII. The first nephridia with recognizable lumina in XVI, but peritoneal masses in XV and some more anterior segments possibly represent nephridia. The alimentary canal widens in XIII, but not until XV, which may be the segment of intestinal origin, is enlargement pronounced. Dorsal and ventral blood vessels well developed; subneural vessel absent. Sperm morulae in X form a compact mass suggesting the presence of a testis – sac and also contained in a narrow stalked seminal vesicle formed by backward evagination of septum 10 / 11 into XI which it almost fills. The sperm funnel situated in the spermatogenic mass at the neck of the seminal vesicle and directed dorsally so as to serve both X and the seminal vesicle. Atria each a bulbous tube with narrow lumen, restricted to XIII, with lining epithelium of eosinophil glandular cells surrounded in turn by a thick sheath of predominantly circular muscle and a layer of similar width and several cells thick of unicellular gland cells: total width of muscular tube (external surface) 0.38 mm, narrowing to 0.195 mm ectally. Ovaries and funnels in XIII. The ovisac almost occluded at the intersegmental septa but bulging dorsally to the gut in each segment and posteriorly containing large oocytes full of large eosinophil yolk granules. Spermatheca unpaired; a simple, narrow, blind tube, 0.14 mm wide, recurving at the ental third, widening ectally before opening, via a narrower section at its pore dorsally in VIII.

Jamieson, Barrie G. M., Fragoso, Carlos (2024): A monograph of the Oligochaete family Alluroididae. Zootaxa 5529 (3): 401-435, DOI: 10.11646/zootaxa.5529.3.1, URL: http://dx.doi.org/10.11646/zootaxa.5529.3.1

Distribution. Ethiopia: Stream at 10,500 feet (3,200 m) in Choke Mts (Mt. Tab). Senan District, Goj jam Province.

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaAnnelidaClitellataAlluroididaAlluroididaeAlluroidesAlluroides brinkhursti abyssinicus

Ssp

Alluroides brinkhursti abyssinicus

MULTIMEDIA

Media Files(6)

FIGURE 4. Alluroides brinkhursti brinkhursti Jamieson (1968). Longitudinal section of the holotype. Abbreviations: br, brain; bv, blood vessel; m, mouth; msh, muscular sheath of atrium; oe, oesophagus; oo, oocyte: os, ovisac; ph m, pharyngeal musculature; pr c, prostatic cells; sep, septum; sep gl, septal gland; sp p, spermathecal pore; s. ves, seminal vesicle; sp, spermatheca; sp f, sperm funnel; tes, testis; vd, vas deferens; v n, ventral nerve cord. Adapted from Jamieson (1968).

Imageimage/png© Jamieson, Barrie G. M.;Fragoso, CarlosJamieson, Barrie G. M.;Fragoso, Carlos

FIGURE 6. Alluroides brinkhursti abyssinicus Jamieson (1968). Longitudinal section of holotype. Abbreviations: epi, epithelium of atrium; gl sh, glandular sheath of atrium; m, mouth; msh, muscular sheath of atrium; oe, oesophagus; oo, oocyte: ph m, pharyngeal musculature; s.ves, seminal vesicle; sp, spermatheca; vbv, ventral blood vessel; vd, vas deferens; v n, ventral nerve cord. Slightly modified from Jamieson (1968).

FIGURE 9. Alluroides ruwenzoriensis Brinkhurst 1964. Atrium and vas deferens entering at midlength. From Brinkhurst (1964).

FIGURE 10. Brinkhurstia americanus. (Brinkhurst 1964). Spermatheca opening mid–dorsally in the anterior of IX. Abbreviations: a, ampulla; cv, commissural vessel. From Omodeo & Coates (2001), reproduced with permission.

FIGURE 11. Brinkhurstia donaldi Omodeo and Coates (2001).A. Scheme showing arrangement of genital organs and vascular commissures. B. Cross section through spermathecal duct. C. Cross section of the muscular sac ensheathing penial seta. D. Section through ental part of prostate. E. Cross section of prostatic duct. F. Dorsal view of the arrangement of the penial setae within IX–XIII. Abbreviations: a, spermathecal ampulla, cv, commissural vessels, d, spermathecal duct, di, spermathecal diverticulum, e, egg, if‚ female funnel, md, male duct, pc, penial seta, pr, prostate. From Omodeo & Coates (2001), reproduced with permission.

FIGURE 14. Lacandodrilus paludosus Fragoso & Rojas 2023. A. External view of the anterior ventral region of a clitellate adult. B. Internal view of the anterior region of an adult. C. Spermatheca. Abbreviations: a, ampulla: clit, clitellum; d, duct; dv, dorsal vessel; gg, genital glands (prostates?); img, internal male gonoducts; mf, male funnels; n, nephridia; oe, oesophagus; sg, septal glands. Modified from Fragoso & Rojas (2023).

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Descriptions(2)

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Media Files(6)

Gallery(6)

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