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