Euchone Malmgren, 1866
Species of Euchone collected from Falkland Islands in this study. See figure comparing Methyl-Green staining patterns for the Falkland Island specimens.
|
Thoracic inferior notochaetae |
Mid-ventral notch of collar +/- |
No. of abdominal chaetigers |
No. of radiolar pairs/No. of pairs of ventral radiolar appendage |
No. of abdominal chaetigers forming pre-pygidial depression |
Shape of pre-pygidial depression |
Size of specimen |
|
|
Euchone sp. 1 |
1 type narrowly limbate |
present |
19 |
?/? |
7 |
narrow |
small |
|
Euchone sp. 2 |
1 type narrowly limbate |
present |
27 |
?/? |
10 |
narrow |
small |
|
Euchone sp. 3 |
1 type narrowly limbate |
present |
22 |
?/? |
5 |
narrow |
very small |
|
Euchone sp. 4 |
2 types narrowly and broadly limbate (but not truly mucronate) |
absent; collar flared |
15 |
?/? |
5 |
narrow |
very small |
|
Euchone undulocincta |
2 types narrowly limbate and mucronate |
present |
23 |
8/2 |
7 |
broad |
medium sized |
Comparison of Euchone pallida records by different authors.
|
Length (mm) |
No. of abdominal chaetigers |
No. of radiolar pairs |
Form of inferior thoracic notochaetae |
Type locality and depth |
|
|
E. pallida Ehlers, 1908 (original description) |
22 (body) + 14 (crown) |
32 (12 forming anal funnel) |
? |
limbate |
Kerguelen Islands, 88m |
|
E. pallida sensu Hartman (1978) |
23-44 (body) for adults and 13 (body) + 5 (crown) for juvenile |
28 (10-18 forming anal funnel) in adults/ 20 (7 forming anal funnel) in juveniles |
?/? |
limbate |
report from Weddell Sea, South Orkneys Island, South Sandwich Islands |
|
E. pallida sensu Licciano et al. (2009) (redescription) |
medium size |
34 (14-15 forming anal funnel) |
20 |
limbate |
Livingstone and Deceptions Islands, 77m |
Comparison of Euchone species known from the geographical area.
|
Length (mm) |
No. of abdominal chaetigers |
No. of radiolar pairs |
Form of inferior thoracic notochaetae |
Type locality and depth |
|
|
E. undulocincta |
15 (including crown) |
22 (6 forming anal funnel) |
9 |
mucronate |
Joinville Island, 133m |
|
E. heterosetosa |
22 (body) + 14 (crown) |
29 (8 forming anal funnel) |
10 |
mucronate |
South Georgia, 2900m. |
|
E. scotiarum |
7.5 (not specified) |
8 (3 forming anal funnel) |
3 |
limbate |
Weddell Sea, 412-654m. |
|
E. pallida Ehlers, 1908 (original description) |
22 (body) + 14 (crown) |
32 (12 forming anal funnel) |
? |
limbate |
Kerguelen Islands, 88m |
