Two new species of tribe Thalassaphorurini Pomorski, 1998 (Collembola: Onychiuridae) from Northeast China
Author
Sun, Xin
Author
Wu, Dong-Hui
text
Zootaxa
2012
3226
61
68
journal article
45280
10.5281/zenodo.280297
b33e2000-0237-4f38-a50a-5e53c061f25c
1175-5326
280297
Thalassaphorura macrospinata
sp. nov.
Figs 10–18
.
Tab. 1
Type
material.
Holotype
female,
6 female
and
10 male
paratypes
.
China
: Jilin province: Changchun: Gaoxin:
30. IX.2011
, litter and soil, Berlese extraction, Song Lihong and Sun Xin leg. All deposited in the Key laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun.
Description.
Body color white in alcohol. Size 1.9–2.0 mm in females, 1.7–1.9 mm in males;
holotype
: 2.0 mm. Body cylindrical, body side parallel.
Pseudocellar formulae as 32/233/33343 dorsally, 11/000/01120 ventrally (
Figs 10, 15
&
17
), subcoxa 1 of legs I–III with 2, 2 and 2 pso respectively. Parapseudocelli present on each side of ventral tube anteriorly to basal chaetae. Pseudopore formulae as 00/011/11110 dorsally, 00/111/000x0 ventrally (
Figs 10, 15
&
17
).
FIGURES 10–15.
Thalassaphorura macrospinata
sp. nov.
: 10, dorsal chaetotaxy; 11, labial palp; 12, PAO and anterior cephalic pso; 13, antenna; 14, distal part of leg III; 15, ventral side of head. Scales: 0.1mm (10 & 13–15), 0.01 mm (11–12).
FIGURES 16–18.
Thalassaphorura macrospinata
sp. nov.
: 16, ventral tube; 17, ventral side of Abd. II–VI; 18, male genital plate. Scales: 0.1mm.
S-chaetae cylindrical, well differentiated, formulae as 11/011/222120 dorsally, 11/000/000100 ventrally (
Figs 10, 15
&
17
). Sp present on head. Microsensilla tiny and blunt, present on Th. II–III (
Fig. 10
).
Head. Antennae short and distinctly segmented, as long as head or slightly longer. Length ratio of antennal segments I: II: III: IV = 1: 2: 2: 2.3. Ant. IV with indistinct S-chaetae, subapical organite with apex globular and basolateral ms at about 1/4 length from base. Ant. III sensory organ composed of 5 papillae, 5 guard chaetae, 2 small sensory rods and 2 smooth subequal clubs, and a lateral ms (
Fig. 13
). Ant. II with 13 chaetae. Ant. I with 9 chaetae. Antennal base with distinct granulation. PAO composed 28–32 simple vesicles (
Fig. 12
). Dorsal cephalic chaeta d0 present. 3+3 chaetae between posterior inner pso on head. Mandible with strong molar plate and 4 apical teeth. Maxilla bearing 3 teeth and 6 lamellae. Maxillary palp simple with 1 basal chaeta and 1 sublobal hairs. Labral chaetae formula 4/142. Labium with 6 proximal, 4 basomedian (E, F, G and f) and 6 basolateral chaetae (a, b, c, d, e, e’); labial papillae of AC
type
, papillae A–E respectively with 1, 4, 0, 3, and 2 guard chaetae (
Fig. 11
). Postlabial chaetae 4+4 along ventral groove (
Fig. 15
).
Body chaetotaxy. Ordinary chaetae differentiated in meso- and macrochaetae, ratio sp: m1: p1 on Abd. V = 1: 0.4: 1.7 (
Fig. 10
). Th. I tergum with 7+7 chaetae dorsally. Th. II–Abd. III terga respectively with 3+3 chaetae on both side of axial line, without dorsal axial chaetae. Abd. IV tergum with m0 axial chaeta, Abd. V with a0 axial chaeta, Abd. VI with only m0 axial chaeta (
Fig. 7
). Th. I, II and III sterna with 1+1, 1+1, 1+1 chaetae respectively.
Subcoxa 1 of legs I–III with 5, 4 and 4 chaetae, subcoxa 2 with 1, 4 and 4 chaetae respectively. Tibiotarsi of legs I, II and III each with 18 (1, 8, 9) chaetae. Unguis with lateral teeth. Unguiculus slender and pointed, 0.9 times as long as inner edge of unguis, without inner basal lamella (
Fig. 14
). Ventral tube with 1+1 anterior chaetae, 6+6 distal chaetae, 2+2 basal chaetae (
Fig. 16
). Furca reduced to a field of fine granulation with 4 small dental chaetae arranged in 2 rows posteriorly; only one manubrial row of chaetae present posteriorly to dental chaetae (
Fig.17
).
Genital plate with 12–14 chaetae in females, 25–30 chaetae in males (
Figs 17–18
). Male organ present, 5+5 inflated distal chaetae with thorns on ventral tube (
Fig. 16
). Anal valves with numerous acuminate chaetae; each lateral valve with a0 and 2a1; upper valves with chaetae a0, 2b1, 2b2, c0, 2c1, 2c2 (
Fig. 17
). Anal spines set on distinct papillae, 1.1 times as long as inner edge of hind unguis (
Fig. 10
).
Ecology.
In broadleaved litter and soil, in a recreational park in town.
Etymology.
Named for its large anal spines.
Remarks.
The new species is very particular as having male organ on ventral tube and only one sublobal hairs on maxillary palp.
T. macrospinata
sp. nov.
is similar to
T. qixiaensis
Yan, Shi & Chen, 2006
, but they can be distinguished by the S-chaetae (well differentiated in
macrospinata
sp. nov.
and not differentiated in
qixiaensis
), the proximal chaetae of labium (
6 in
macrospinata
sp. nov.
versus
7 in
qixiaensis
), the number of chaetae on Th. I tergum (7+
7 in
macrospinata
sp. nov.
versus 6+
6 in
qixiaensis
), the dorsal axial chaetae on Abd.VI (m0 in
macrospinata
sp. nov.
versus a0 & m0 in
qixiaensis
), the number of chaetae on subcoxa 1 of legs I (
5 in
macrospinata
sp. nov.
versus
4 in
qixiaensis
), the position of male organ (5+5 inflated distal chaetae on distal ventral tube in
macrospinata
sp. nov.
versus 6–12 short, broad and thin with apex pointed chaetae on Abd. II and 7–10 on Abd. III in
qixiaensis
), and the ratio of anal spines/inner edge of hind unguis (1.1 in
macrospinata
sp. nov.
versus 0.8 in
qixiaensis
).
T. macrospinata
sp. nov.
belongs to the group including
T. encarpata
(
Denis, 1931
)
,
T. lifouensis
(
Thibaud & Weiner, 1997
)
,
T. petaloides
(
Rusek, 1981
)
,
T. qixiaensis
Yan, Shi & Chen, 2006
,
T. tenuis
Babenko, 2007
,
T. thaibinhensis
(
Nguyen, 2001
)
,
T. tiani
Sun, Chen & Deharveng, 2010
,
T. tibiotarsalis
Sun, Chen & Deharveng, 2010
,
T. zschokkei
(
Handschin, 1919
)
, with pseudocellar formulae as 32/233/33343 dorsally and 11/000/01120 ventrally. The mainly combined characters to separated them are shown in
Table 1
.
TABLE 1.
Comparison of species having the same pseudocellar formula (32/233/33343 dorsally and 11/000/01120 ventrally) in
Thalassaphorura
.
| Number of chaetae in distal whorl of tibiotarsi |
Number of chae- tae between pos- terior inner pso on head |
Ratio of AS/ unguis |
Inner basal lamella on unguiculus |
Number of vesi- cles in PAO |
Dorsal S-chaetae formula |
Labial type |
Axial chaetae on Abd. VI |
|
macrospinata
sp. nov.
|
9 |
3+3 |
1.1 |
absent |
28–32 |
11/011/222120 |
AC |
m0 |
|
encarpata
|
9 |
3+3 |
0.8 |
absent |
22–25 |
indistinct |
A |
a0, m0 |
|
lifouensis
|
9 |
4+4 |
0.5 |
present |
17–23 |
10/011/222120 |
AC |
a0, m0 |
|
petaloides
|
7* |
3+3 |
1.0 |
present |
18–21 |
10/011/221121 |
AC |
a0, m0 |
|
qixiaensis
|
9 |
3+3 |
0.8 |
absent |
21–30 |
indistinct |
AC |
a0, m0 |
|
tenuis
|
9 |
3+3 |
0.4 |
absent |
11–13 |
11/011/111010 |
ABC |
a0 |
|
thaibinhensis
|
? |
3+3 |
0.9 |
absent |
20 |
10/???/?????? |
? |
a0, m0 |
|
tiani
|
9 |
3+3 |
1.0 |
present |
24–26 |
11/011/222120 |
AC |
a0, m0 |
|
tibiotarsalis
|
7 |
3+3 |
0.7 |
present |
17–18 |
11/011/222120 |
ABC |
a0 |
|
zschokkei
|
9 |
3+3 |
0.7 |
present |
24–28 |
indistinct |
AC |
a0* |
*
T. petaloides
: data from personal examination on the specimens of
China
(Guangxi: Fushui, Longzhou and Huangjiang) preserved in the Museum national d’Histoire naturelle (Paris,
France
).
T. zschokkei
: data from the description in
Pomorski (1998)
.