Notes on some tardigrades from South Africa, with the description of Diphascon (Diphascon) zaniewi sp. nov. (Eutardigrada: Hypsibiidae)
Author
Kaczmarek, L Ukasz
Author
Michalczyk, L Ukasz
text
Zootaxa
2004
576
1
6
journal article
41711
10.5281/zenodo.157712
1205af99-6351-43b0-a268-a56a5ae7e680
11755326
157712
A22DF8DD-4976-4CFF-BAEF-19175C01625D
1.
Diphascon
(
Diphascon
)
zaniewi
sp. nov.
(
Figs 1–4
;
Tab. 1
)
Description
Holotype
(2272/1): Body length 184.3 (
Fig. 1
). Body slender, transparent, eyes absent. Cuticle on dorsal and ventral side smooth and without pores. Peribucal lamellae and papulae absent.
Buccopharyngeal apparatus without strengthening bar. Dropshaped structure between rigid buccal and flexible pharyngeal tube present. Buccopharyngeal tube 53.2 long. Buccal tube 18.5 long and 0.9 [
4.9
] wide (34.8 % of total length of buccopharyngeal tube). Pharyngeal tube 34.7 long and 0.9 [
4.9
] wide. At end of pharyngeal tube small triangular apophyses present. Stylet supports inserted on buccal tube at 10.9 [
58.9
]. Pharyngeal bulb oval with three rodshaped macroplacoids (without central constrictions), very small granular microplacoid and septulum. First macroplacoid 2.9 [
15.7
] long, second 2.9 [
15.7
] long and third 4.3 [
23.2
] long. First and second macroplacoid in same length and each distinctly shorter then third one (configuration: 112). Septulum 1.9 [
10.3
] long. Macroplacoid row 11.4 [
61.6
] long. Placoid and septulum row 14.3 [
77.3
] long (
Fig. 2
).
Claws well developed and with distinct accessory points on primary branches. Claws on III pair of legs: external 8.6 [
46.5
], internal 6.2 [
33.5
]; IV pair of legs: posterior 9.5 [
51.4
], anterior 6.7 [
36.2
]. Lunules and other cuticular structures on legs absent (
Figs 3–4
). Eggs unknown.
Type
material
Holotype
(2272/1) and 7 (
3 in
simplex stage)
paratypes
on two slides (2272/1 and 2272/3):
South Africa
, Sun City, Dragon Mountains, moss from soil,
1000 m
asl, near the waterfall, 12.2003, leg. Krzysztof Kaczmarek.
Type
depositories
Holotype
(2272/1) and 3
paratypes
(2272/1) (one in simplex stage) are preserved at the Department of Animal Taxonomy and Ecology, A. Mickiewicz University, Pozna–, 3
paratypes
(2272/3) (
2 in
simplex stage) are preserved in the collection of £. MICHALCZYK (Jagiellonian University,
Poland
).
TABLE 1.
Measurements [in µm] and the
ptd
values of selected morphological structures of specimens of
Diphascon (D.) zaniewi
sp. nov.
mounted in Hoyer’s medium (in the body length order).
CHARACTERS |
Paratype 1 [µm]
ptd
|
Paratype 2 [µm]
ptd
|
HOLOTYPE [µm]
ptd
|
Body length |
175.8
950.3
|
183.4
1013.3
|
184.3
996.2
|
Buccal tube length |
18.5
|
18.1
|
18.5
|
Buccopharyngeal tube length |
52.3
282.7
|
50.4
278.5
|
53.2
287.6
|
Level of the stylet support insertion point |
10.9
58.9
|
10.5
58.0
|
10.9
58.9
|
Buccal tube external width |
0.9
4.9
|
0.9
5.0
|
0.9
4.9
|
Macroplacoid 1 length |
2.9
15.7
|
2.9
16.0
|
2.9
15.7
|
Macroplacoid 2 length |
2.9
15.7
|
2.9
16.0
|
2.9
15.7
|
Macroplacoid 3 length |
4.8
25.9
|
3.8
21.0
|
4.3
23.2
|
Septula length |
1.9
10.3
|
1.9
10.5
|
1.9
10.3
|
Macroplacoid row length |
11.4
61.6
|
11.9
65.7
|
11.4
61.6
|
Placoid row length |
14.3
77.3
|
14.3
79.0
|
14.3
77.3
|
Primary branch of external claw 2 length |
8.6
46.5
|
8.6
47.5
|
8.6
46.5
|
Primary branch of internal claw 2 length |
5.7
30.8
|
5.7
31.5
|
6.2
33.5
|
Primary branch of external claw 4 length |
5.7
30.8
|
6.2
34.3
|
6.7
36.2
|
Primary branch of internal claw 4 length |
8.6
46.5
|
9.0
49.7
|
9.5 51.4 |
FIGURES 1–4.
Diphascon zaniewi
sp. nov.
1 — Habitus; 2 — Buccopharyngeal apparatus; 3 — Claws of the second pair of legs; 4 — Claws of the fourth pair of legs.
Etymology
|
The name |
‘
zaniewi
’
|
is |
dedicating |
in |
honour |
of |
the |
first |
author’s |
friend, |
Mr. |
Grzegorz |
Zaniewicz. |
Differential diagnosis
Diphascon
(
Diphascon
)
zaniewi
sp. nov.
differs from all species of the
pingue
group by having a very narrow buccal tube (less then 1.0) and second macroplacoid in the same length as the first one. Besides, it differs from the most similar:
1.
Diphascon
.
(
D.
)
pingue
Marcus, 1936
by: smaller percentage proportion of buccal tube to buccopharyngeal tube (
37.8–39.8 in
D.
(
D.
)
pingue
and
34.8–35.9 in
D.
(
D.
)
zaniewi
sp. nov.
); longer macroplacoid row (6.7–10.7 [
53.5–58.8
] in
D.
(
D.
)
pingue
and 11.4–11.9 [
61.6–65.7
] in
D.
(
D.
)
zaniewi
sp. nov.
); longer placoid and septulum row(8.7– 13.9 [
51.5–62.9
] in
D.
(
D.
)
pingue
and 14.3 [
77.3–79.0
] in
D.
(
D.
)
zaniewi
sp. nov.
).
2.
Diphascon
(
D.
)
pinguiforme
Pilato & Binda, 1997
/98 by: smaller percentage proportion of buccal tube to buccopharyngeal tube (
37.04 in
D.
(
D.
)
pinguiforme
and
34.8– 35.9 in
D.
(
D.
)
zaniewi
sp. nov.
); shorter macroplacoids 1 and 2 (I 3.4–3.6 [
18.7–19.0
]; II 3.1–3.6 [
16.9–19.0
]) in
D.
(
D.
)
pinguiforme
and (I 2.9 [
15.7–16.0
]; II– 2.9 [
15.7–16.0
]) in
D.
(
D.
)
zaniewi
sp. nov.
); shorter septulum (2.2–2.5 [
11.8 –13.8
] in
D.
(
D.
)
pinguiforme
and 1.9 [
10.3–10.5
] in
D.
(
D.
)
zaniewi
sp. nov.
).