摘要
在调查兰州陆栖寡毛类的过程中,发现一新亚种,现记述如下。河北环毛蚓兰州新亚种Pheretima tschiliensis Michaelsen lanzhouensis subsp.nov.外部特征:体长245—310毫米,宽6~7毫米,体节数111~149(模式:长310毫米,宽7毫米,体节139节)。体圆柱形。土黄色、背中线深灰色。口前叶为1/2上叶式。背孔自12/13节间始。环带占ⅩⅣ~ⅩⅥ节,较长(7~8毫米),无刚毛和背孔(仅1条标本有背孔)。
A new subspecies belonging to Pheretima is described as follows;Pheretima tschiliensis lanzhouensis subsp.nov.Type locality:Lanzhou,Kansu Province.Description;Length 245-310mm;diameter 6-7mm.Segments 111-149.Body cylindrical.Prostomium epilobous.First dorsal pore in 12/13.Clitellum in xiv-xvi,without setae.Setae fine,closely arranged,32-40 on iii,50 on v,35-46 on vi,46-55 on viii,formulla:14-17 (vi),16-24(viii),8-14 (xviii),Ventral setae aa about 1.2-2 times as ab before the clitellum,about 2 times as ab behind the clitellum;dorsal setae zz about 1.2-2 times as yz before the clitellum,2 times as yz behind the clitellum.Female pore single,mid-ventral on xiv,surrounded by a circular white area.Male pores paired within shallow copulatory pouches opening onto xviii,usually with one small flat papilla in pouches.Spermathecal pores 3 paired,ventrally,inconspicuous in 6/7,7/8,8/9;ca.1/3 ventral apart.Genital papillae absent.Septa 5/6-7/8 thickened,9/10 absent but 8/9 traceable ventrally and me-mbraneously,10/11 backward membranous.Gizzard in segments ix and x.Intestine caeca complex,in xxvii-xxiii,with dis- tinct ventral indentations.Intestine swelling in segment xv.Last lateral hearts in xiii.Paired lymph glands along dorsal vessel behind caecnl region.Holandric,testes sac paired,in x and xi.Seminal vesicles in xi and xii.Prostate gland small in xvii-xix.Prostatic ducts V-shaped.Spermathecae paired in vii,viii,ix.Ampulla spherical,surface wrinkled into transverse line.Diverticulum equal in length to main pouch,ental 2/3 closely twisted in zigzag fashion.Ampulla 2 mm.Wide and 2 mm.long;ampulla duct 2 mm.long and 1.2 mm.at its widest part.The differences between the new subspecies and other geographical races of Pheretima tschiliensis are given in table 1.
作者
冯孝义
Feng Xiaoyi(Medical College of Lanzhou,Kansu)
