Jasmineira Langerhans, 1880
Several species in genus Jasmineira were collected from Falkland Islands in this study and these are summarised in table below as well as comparative image of staining patterns. These cannot be unambiguously assigned to the species previously reported from the area, mostly due to limitations of existing descriptions and the fact that branchial crowns are often missing. Further, Jasmineira sp. 2, Jasmineira sp. 3 and J. cf. regularis (itself having 2 forms) are very similar to each other, mostly differing in number of radiolar pairs (where possible to establish or at least estimate from abscission zone), number of abdominal segments and body shape of posterior end and pygidium as well as Methyl Green staining patterns. Additionally two more Jasmineira species with number of abdominal segments greater than 30 were distinguished Jasmineira sp. 1 with lateral incision on collar (not detected in other species collected here or reported in literature available on species known from the area) and Jasmineira sp. 4, which differs in its body shape, with segments having shallow, but distinct constrictions given them somewhat bead-like appearance. Of the species known from the area (see table below) only Jasmineira crumenifera Hartmann-Schröder, 1986 has over 30 abdominal segments, however it is unclear which (if any) of the specimens encountered here belong to this species and examination of the holotype is required.
Comparison of characters of Jasmineira species known from the area as reported in literature from original descriptions.
|
Species |
Body + crown length (mm) |
Pairs of radioles |
No. of pairs of radiolar appendages |
Collar incision |
No. of abdominal chaetigers |
Type locality |
|
J. caeca |
3 + 1.3 |
8 |
? |
absent |
12 |
Kerguelen Islands, shallow? |
|
J. crumenifera |
17 + ? |
12-15 |
1 |
midventral present |
37 |
S. Shetlands, 488m |
|
J. macrophthalma |
? |
3 |
? |
? |
10-12 |
Wilhelm II Coast, 385m |
|
J. regularis |
10-16 + ? |
5 |
? |
midventral present |
24-28 |
Weddell Sea, 512-2936m |
|
J. scotti (not considered valid) |
? |
25-30 |
? |
? |
20 |
McMurdo Sound (Ross Sea), shallow |
Comparison of characters of Jasmineira species collected from Falkland Islands in this study. See images for Methyl-Green staining patterns.
|
Species |
Body + crown length (mm) |
Pairs of radioles |
No. of pairs of radiolar appendages |
Collar incision |
No. of abdominal chaetigers |
Form of posteriomost chaetigers and pygidium |
Voucher locality |
|
Jasmineira sp. 1 (this study) |
6.5 + 5 |
8 |
3 |
midventral and lateral present |
36 |
gradually narrowing into sharp triangular pygidial lobe |
Falkland Is., ~ 1000m |
|
Jasmineira sp. 2 (this study) |
7.5 |
10? |
? |
midventral present |
18 (18-20) |
narrowing abruptly into triangular pygidial lobe |
Falkland Is., ~ 500m |
|
Jasmineira sp. 3 (this study) |
15 + ? |
? (15 scars in total ) |
? ? (15 scars in total ) |
midventral present |
30-32 |
gradually narrowing into sharp triangular pygidial lobe |
Falkland Is., ~ 500m |
|
Jasmineira sp. 4 (this study) |
13.5 + ? (segments constricted) |
? |
? |
midventral present |
34 |
narrowing abruptly into triangular pygidial lobe |
Falkland Is., ~1000m |
|
Jasmineira sp. 5 (Claviramus?) (this study) |
2 + ? |
? |
? |
midventral present |
10 |
narrowing abruptly into wide triangular pygidial lobe with short, slender terminal cirrus |
Falkland Is., ~ 500m |
|
Jasmineira sp. 6 (this study) |
2.2 + ? |
? |
? |
midventral present |
10 |
gradually narrowing into blunt triangular pygidial lobe |
Falkland Is., ~ 500m |
|
J. cf. regularis (this study) form 1 |
6 + 3 |
5 |
2 |
midventral present |
24 |
gradually narrowing into blunt triangular pygidial lobe |
Falkland Is., ~ 500m |
|
J. cf. regularis (this study) form 2 |
9.5 + ? |
7 scars in total (5?) |
7 scars in total (2?) |
midventral present |
26-28 |
gradually narrowing into sharp triangular pygidial lobe |
Falkland Is., ~ 500m |