Amynthas species

Amaliah, Rizki, Fahri, F. & Nguyen, Anh D., 2024, New species and new record of the genus Amynthas Kinberg, 1867 (Oligochaeta: Megascolecidae) from Sulawesi, Indonesia, Raffles Bulletin of Zoology 72, pp. 116-126 : 123-124

Key to Amynthas species recorded in Sulawesi, Indonesia

1. Spermathecal pores absent (not visible)................................... ........................................................... Amynthas bonthainensis

– Spermathecal pores present.....................................................2

2. First spermathecal pores at 4/5......................... A. hexathecus

– First spermathecal pores behind 4/5.......................................3

3. First spermathecal pores at 5/6...............................................4

– First spermathecal pores behind 5/6.......................................5

4. One thecal segment ................................. A. lompobatangensis

– More than one thecal segment........................... A. padasensis

5. First spermathecal pores at 6/7 ...............................................6

– First spermathecal pores at 7/8 .............................................10

6. Genital markings absent............. A. triatmowidii , new species

– Genital markings present ........................................................7

7. More than 40 setae in each segment v–viii ...........................8

– Less than 40 setae in each segment v–viii.............................9

8. Ampulla sac-shaped ............................................ … A. juloides

– Ampulla almost spherical-shaped ..................... A. minahassae

9. Ampulla pear-shaped to sac-shaped, with narrow, short, and a slender duct........................................................ A. kalaenensis

– Ampulla sack-shaped, rounded, with enlarged duct ................ .............................................................................. A. castaneus

10. One thecal segment ...............................................................11

– Two thecal segment ..............................................................12

11. Ampulla pyriform-shaped, with defined duct............ A. zebrus

– Ampulla sack-shaped, short, and wide, with barely visible duct ......................................................................... A. culminis

12. Genital markings absent........................................................13

– Genital markings present ......................................................15

13. Spermathecae with a short diverticulum duct .......................... .......................................................................... A. sarasinorum

– Spermathecae with a long undulating diverticulum duct.....14

14. Ampulla pyriform sac-shaped................................ A. digitatus

– Ampulla nearly spherical-shaped........................ A. jampeanus

15. Intestinal caeca extending to xxv .........................................16

– Intestinal caeca extending to xxvi ........................................17

16. Ampulla globular with a narrow duct and a long, club-shaped diverticulum.......................................................... A. purpureus

– Ampulla irregular sack-shaped with a thick, spindle-shaped duct, and a twisted diverticulum............................... A. dorous

17. Ampulla sack-shaped with an enlarged duct and a twisted diverticulum.............................................................. A. fissiger

– Ampulla sack with flat-shaped, elongated, distally widened, with cylindrical duct....................................... A. semifasciatus