Barriejamiesonia Ljungström 1971

Jamieson, Barrie G. M. & Fragoso, Carlos, 2024, A monograph of the Oligochaete family Alluroididae, Zootaxa 5529 (3), pp. 401-435 : 420

Genus Barriejamiesonia Ljungström 1971

Barriejamiesonia Ljungström 1971: 321 . (Correction for Barryjamiesonia of Ljungström)

Alluroidinae in which the ‘atria’ are divided into three regions: an ectal muscular spindle–shaped chamber, a short narrow duct and an ental gland; vas deferens opening independently from the corresponding atrial duct and not thickened. Male pores ventral just in front of or slightly lateral to a. Setae ab of XIII present but not modified. Genital setae absent. Spermathecal pores lateral on extreme posterior margin of VIII. First septum 5/6; 10/11 not attenuated. First visible nephridia in VII. Intestine commencing in XIV. Seminal vesicles present.

Remarks. Ljungström distinguished this genus from Alluroides by the atria not being wide coiled tubes, the vasa deferentia opening ectally rather than entally; the atria being divided into a muscular duct and a glandular prostate; first septum 5/6 rather than 3/4; first nephridia in VII rather than in XIII–XIV. From Brinkhurstia in having a muscular rather than non–muscular chamber; the prostate cells not surrounding the muscular duct; penial setae absent; male pores ventral rather than ventro–lateral; setae ab present in XIII; spermathecal pores paired ventral on VII rather than?IX or further back. From Standeria in having the atria divided into a glandular and muscular duct rather than a muscular duct lined internally with prostatic cells; vas deferens opening ectally rather than entally into the chamber; setae ab present in XIII; spermathecal pores on VIII rather than IX; first septum 5/6 rather than 4/5; 10/11 not attenuated; genital setae absent; first nephridia in VII rather than XI; intestinal origin in XIV rather than XV; seminal vesicles present.

Further differences from other alluroidine genera were that the atria are more like the prostates of the Ocnerodrilinae; the wide separation of the dorsal setae at 0.44 rather than 0.2 of the circumference; and the absence of a visible latero-muscular groove.