Amynthas ani, Hong & James, 2009

Hong, Yong & James, Samuel W., 2009, Some new Korean Megascolecoid earthworms (Oligochaeta), Journal of Natural History 43 (21 - 22), pp. 1229-1256 : 1252-1254

Amynthas ani sp. nov.

( Figure 13 )

Type material

Holotype: Clitellate (NIBRIV0000120474) specimen: Korea, Gyeongsangnam-do, Mt Jiri , 22–26 July 1969, Y. T. An coll. 1 paratype: 1 clitellate (NIBRIV0000120481): same data as for holotype.

Other material

Same data as for holotype, 2 clitellate specimens.

Etymology

The species is named for its type collector.

Diagnosis

Spermathecal pores ventral on anterior of VI–IX, near 5/6–8/9, 0.30 mm circumference apart; male pores superficial at lateral ends of seminal grooves within paired hardened male discs, 0.20–mm circumference apart.

Description

Brown dorsal pigment. Dimensions 164–171 by 8.2 mm at segment X, 7.8 mm at XXX, 8.0 mm at clitellum; body cylindrical throughout, segments 125–130. Setae regularly distributed around segmental equators, numbering 65 at VII, 68 at XX; 10– 15 between male pores, distance regular; setal formula AA: AB: YZ: ZZ = 6: 3: 3: 6 at XIII. Female pore single in XIV, 0.8 mm, round-shaped. First dorsal pore 12/13.

Male pores superficial at lateral ends of seminal grooves within paired hardened male discs; discs oval, raised above body wall level, with diagonal seminal groove, 0.20 mm circumference apart. Spermathecal pores ventral on anterior of VI–IX, near 5/6–8/9 respectively, slightly elevated conspicuous small flat-top porophore, pore opening appears black, spermathecal pores 0.30 mm circumference apart. Genital markings absent.

Septa 5/6, 6/7, 7/8 thick, 8/9, 9/10 absent, 10/11–13/14 thick. Gizzard globular in VIII–X. Intestine begins in XV, lymph glands small from XX. Typhlosole medium height from XXVII. Intestinal caeca simple, originating in XXVII, and extending anteriorly to about XXIII, each finger-shaped with seven or eight serriform outgrowths. Hearts X–XIII oesophageal, IX lateral.

Ovaries in XIII. Four pairs of spermathecae in VI–IX; ampulla vary among segments, increasing in size and roundness posteriorly; pear-shaped or nearly spherical, ducts short, diverticula somewhat slender and thin, shorter than ampulla, straight or slightly curved, not coiled; no nephridia on spermathecal ducts. Male sexual system holandric, testes and funnels in paired sacs in X, XI, both united ventrally through a posterior extension, sacs of XI enclose seminal vesicles, hearts. Hearts of X enter dorsal wall of testes sacs, hearts of XI completely within testes sacs but separated from contents by internal membrane. Seminal vesicles small, two pairs in XI, XII. Prostates XVIII large within XVII– XX; short, thick ducts, both glandular portions consist of three main lobes. Genital papillae glands absent.

Remarks

Amynthas ani sp. nov. keys out to the rimosus -group in Sims and Easton (1972), which is composed of A. rimosus effeminatus (Gates, 1932) and A. rimosus rimosus (Gates, 1931) , both of which are from Myanmar. Amynthas formosae (Michaelsen, 1922) and A. chaishanensis ( James et al., 2005) are proandric species from Taiwan, with dorsal intrasegmental pores on VI–IX ( James et al. 2005), but this new species has ventral intrasegmental spermathecal pores. Until now, only A. monstriferus ( Kobayashi, 1936) recorded from Korea has ventral intrasegmental spermathecal pores, but A. monstriferus has manicate intestinal caeca.

Figures

Figure 13. Amynthas ani sp. nov.: ventral view and spermathecae.