Definition of families, subfamilies, genera and subgenera of the Eutardigrada, and keys to their identification
Author
Pilato, Giovanni
Author
Binda, Maria Grazia
text
Zootaxa
2010
2404
1
54
journal article
37600
10.5281/zenodo.194138
8e9e99c9-423f-49ff-8556-b05ec9db04f2
1175-5326
194138
Key to the genera of
Macrobiotidae
1. Claws on the fourth pair of legs reduced to granular rudiments or absent; claws on the first three pairs of legs of the
Xerobiotus
type
(
Fig. 20
E) ............................................................................................................
Pseudohexapodibius
- Claws on the fourth pair of legs normally developed.................................................................................................. 2
2. Bucco-pharyngeal apparatus with rigid tube ................................................................................................................ 3
- Bucco-pharyngeal apparatus with the tube subdivided into an anterior rigid and a flexible caudal tract .................. 11
3. Claws of the
hufelandi
type
(
Figs. 1
F, 20C); peribuccal lamellae may be present or absent ....................................... 4
- Claws different; peribuccal lamellae present................................................................................................................ 9
4. Dorsal wall of the buccal tube smooth (without ridge or hook). Branches of the stylet furcae typically shaped (
Fig. 4
A),
i. e.
, with thickened, swollen, rounded apices ...................................................................................................... 5
- Dorsal wall of the buccal tube with a dorsal ridge or hook. Branches of the stylet furcae with thickened but not swol- len apices (
Fig. 4
B) ....................................................................................................................................................... 8
5. Double systems of transverse ridges present in the buccal armature (
Fig. 21
B).....................................
Famelobiotus
-
Only one (well or less developed) system of dorsal and ventral transverse ridges present in the buccal armature..... 6
6. Peribuccal lamellae absent. Peribuccal papulae present. Buccal tube narrow or very narrow; stylet supports inserted on the bucal tube at 48–73 % of its length in the known species (
Fig. 22
C, D)...........................................
Minibiotus
- Peribuccal lamellae present. Stylet supports inserted on the buccal tube at well over half its length (
Fig. 21
A) ........ 7
7. All the following characters present: claws of the
hufelandi
type
; cuticle without pores; buccal tube wide; three rod- shaped macroplacoids; microplacoid distant from the third macroplacoid (more than its length) (
Fig. 21
C); eggs with conical processes and areolated egg shell ..........................................................................................
Paramacrobiotu
s
-
Claws of the
hufelandi
type
. At least one of the above indicated characters is different; in particular, when three macroplacoids and microplacoid are present, the microplacoid is not so distant from the third macroplacoid (
Fig. 21
A) ...........................................................................................................................................................
Macrobiotus
8. Dorsal wall of the buccal tube and anterior tract of the ventral lamina with a ridge but without a hook (
Fig. 22
A).....
...................................................................................................................................................................
Adorybiotus
- Both buccal tube dorsal wall and anterior tract of the ventral lamina with a hook (
Fig. 22
B)
.....................
Richtersius
9. Claws of the
Xerobiotus
type
(
Fig. 20
E)
.......................................................................................................
Xerobiotus
-
Claws of the
Calcarobiotus
type
, at least on the first three pairs of legs (
Fig. 20
A,B) ............................................. 10
10. Claws of the
Calcarobiotus
type
with very long accessory points connected to the primary branch by a flexible tract (
Fig. 20
B)
......................................................................................................................................................
Schusterius
- Accessory points normally developed (
Fig. 20
A)
...................................................................................
Calcarobiotus
(see below the key to the subgenera)
11. Claws of the
Biserovus
type
(
Fig. 20
F). Peribuccal lamellae present (
Fig. 23
A)..........................................
Biserovus
- Claws of the
hufelandi
type
(
Figs. 1
F, 20C). Peribuccal lamellae present or absent.................................................. 12
12. Peribuccal lamellae absent, peribuccal papulae present (
Fig. 23
B). Branches of the stylet furcae typically shaped (
Fig. 23
B)
.......................................................................................................................................................
Minilentus
- Peribuccal lamellae present (
Fig. 23
C). Branches of the stylet furcae arched and converging backwards (
Figs. 4
C, 23C).............................................................................................................................................................
Insuetifurca