A new Mexican species of the Cryptopygus complex (Collembola, Isotomidae) associated with the hermit crab Coenobita clypeatus (Crustacea, Coenobitidae) Author Palacios-Vargas, José G. 0000-0001-9097-6813 Laboratorio de Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México, D. F., Mexico text ZooKeys 2024 2024-06-20 1205 89 99 journal article 10.3897/zookeys.1205.114394 8447F80F-36AE-4EAB-9BE2-6D868D47A6B7 Cryptopygus Willem, 1901 Diagnosis (modified from Potapov 2001 ). Anurophorinae with fused Abd V and VI , well-developed furcula and bidentate or tridentate mucro. Slender body shape, from small to median size. Eyes from 0 + 0 to 8 + 8. Color usually pale. Integument smooth, with rare exceptions. Furcula present, mucro separated from dens, bi- or tridentate. Manubrium with 1–8 pairs of anterior setae. Dens slender, smooth or crenulated, continuously narrowing towards its apex. Abd V and VI fused. PAO and empodium present; anal spines absent, apical bulb usually absent on antenna. Clavate tibiotarsal hairs absent or present. Body setae usually short, macrosetae differentiated at least on last abdominal segments.