The earthworm fauna of Palawan, Philippines with description of nineteen new pheretimoid species (Clitellata: Megascolecidae) Author Aspe, Nonillon M. Author Manasan, Rafael Ethan Author Manlavi, Albert B. Author Patiluna, Ma. Lotus E. Author Sebido, Maria Asela B. Author Obusan, Marie Christine M. Author Simbahan, Jessica F. Author James, Samuel W. text Journal of Natural History 2021 2021-07-01 55 11 - 12 733 797 http://dx.doi.org/10.1080/00222933.2021.1923849 journal article 10.1080/00222933.2021.1923849 1464-5262 5463798 Genus Polypheretima Michaelsen, 1934 Type species Perichaeta stelleri Michaelsen, 1892 . Generic diagnosis Body cylindrical; setal arrangement perichaetine; annular clitellum covering segments xiv–xvi; pair of male pores in xviii on circular porophores that may be within copulatory bursae; ventral genital markings present or absent; oesophageal gizzard in viii; intestine begins in xv or xvi; nephridia on spermathecal ducts lacking; caeca lacking; male sexual system usually holandric, with testes and funnels enclosed in paired sacs in x and xi; seminal vesicles in xi and xii; spermathecal pores small, spermathecal diverticula simple and usually ectal in origin; prostates racemose; copulatory bursae may or may not be present; ovaries free in xiii; oviducts lead to single or closely paired opening ( Easton 1979 ).