Ochetostoma

Biseswar, Ramlall, 2009, The geographic distribution of echiurans in the Atlantic Ocean (Phylum Echiura), Zootaxa 2222, pp. 17-30 : 22-23

Key to the species of the genus Ochetostoma from the Atlantic Ocean

The keys provided by DattaGupta and Menon (1971) and Stephen and Edmonds (1972) for the species of Ochetostoma have been modified in light of additional information obtained from redescriptions of some of the species.

1 Gonoducts 7 pairs; 7 longitudinal muscle bands .................................................................................. O. senegalense

- Gonoducts 2 or 3 pairs .................................................................................................................................................. 2

2 Gonoducts 3 pairs ...........................................................................................................................................................

- Gonoducts 2 pairs ......................................................................................................................................................... 4

3 12–18 longitudinal muscle bands ................................................................................................... O. erythrogrammon

- 21–22 longitudinal muscle bands ........................................................................................................ O. multilineatum

4 Proboscis with gill-like processes along basal edges; 8 longitudinal muscle bands ........................................ O. arkati

- Proboscis without gill-like processes ........................................................................................................................... 5

5 Oesophageal diverticulum is present; 13 longitudinal muscle bands .......................................................... O. mercator

- Oesophageal diverticulum is absent ............................................................................................................................ 6

6 Interbasal muscle between the setae is present; 17–18 longitudinal muscle bands ........................................ O. baronii

- Interbasal muscle is absent .......................................................................................................................................... 7

7 Subulate papillae are present at posterior tip of trunk around anus; 12–13 longitudinal muscle bands …. O. glaucum

- Subulate papillae are absent ......................................................................................................................................... 8

8 Trunk covered with small uniformly distributed papillae; 10–11 longitudinal muscle bands........................ O. hupferi

- Papillae are not uniformly distributed over surface of trunk; longitudinal muscle bands more than 11..................... 9

9 Small papillae are present only on anterior and posterior ends of trunk; 18 longitudinal muscle bands. O. kefersteini

- Papillae are larger and more densely packed at posterior end of trunk; 13 longitudinal muscle bands .. O. pellucidum