Belongs within: Gonyleptidae.
Geraecormobius is a heterogeneous genus of gonyleptid harvestmen found from Argentina and Paraguay to southern Brazil (Vasconcelos 2005).
Characters (from Vasconcelos 2005): Ocularium bearing two spines; opisthosomatic area II with two tubercles; free tergites usually unarmed (may have spines present in females); pedipalpal femur lacking mesodistal spine.
<==Geraecormobius Holmberg 1887V05 (see below for synonymy) |--*G. sylvarum Holmberg 1887 [=Ge. silvarum (l. c.); incl. Anomaloleptes princeps Piza 1940, Geraecormobius princeps]K03 |--G. anomalus (Mello-Leitão 1931) [=Weyhia anomala, G. anomala]K03 |--G. armatus (Roewer 1913) [=*Weyhia armata, G. armata]K03 |--G. bispinifrons (Roewer 1943) [=Geraecormobiella bispinifrons]K03 |--G. cervifrons Mello-Leitão 1944 [=G. spinifrons Mello-Leitão 1942 non Weyhia spinifrons Mello-Leitão 1923]K03 |--G. clavifemur (Mello-Leitão 1927)V05 (see below for synonymy) |--G. convexus (Mello-Leitão 1931) [=*Geraecormobiella convexa; incl. Geraecormobius cheloides Mello-Leitão 1940]K03 |--G. cunhai Soares 1945K03 |--G. granulosus (Mello-Leitão 1937) [=Weyhia granulosa, G. granulosa]K03 |--G. indivisus (Mello-Leitão 1933) [=*Guascaleptes indivisus]K03 |--G. nanus (Mello-Leitão 1935) [=Weyhia nana, G. nana]K03 |--G. pallidimanu (Mello-Leitão 1935) [=Weyhia pallidimanu]K03 |--G. reitzi Vasconcelos 2005V05 |--G. rohri (Mello-Leitão 1933) [=Weyhia rohri; incl. W. serriperna Mello-Leitão 1937, Geraecormobius serriperna]K03 |--G. salebrosus (Roewer 1913) [=Weyhia salebrosa, G. salebrosa]K03 `--G. spinifrons (Mello-Leitão 1923) (see below for synonymy)K03
Geraecormobius Holmberg 1887V05 [incl. Geraecormobiella Mello-Leitão 1931V05, Geraecomorbiella (l. c.)KA-Z11, Guascaleptes Mello-Leitão 1933V05, Weyhia Roewer 1913V05, Weghia (l. c.)V05]
Geraecormobius clavifemur (Mello-Leitão 1927)V05 [=Weyhia clavifemurV05; incl. Ilhaia meridionalis Mello-Leitão 1927V05, Jlhaia meridionalisK03, Mischonyx meridionalisV05]
Geraecormobius spinifrons (Mello-Leitão 1923) [=Weyhia spinifrons ; incl. W. bresslaui Roewer 1927, Geraecormobius bresslaui, W. montis Mello-Leitão 1935, G. montis]K03
*Type species of generic name indicated
References
[K03] Kury, A. B. 2003. Annotated catalogue of the Laniatores of the New World (Arachnida, Opiliones). Revista Ibérica de Aracnología, volumen especial monográfico 1: 1–337.
[KA-Z11] Kury, A. B., & M. A. Alonso-Zarazaga. 2011. Addenda and corrigenda to the “Annotated catalogue of the Laniatores of the New World (Arachnida, Opiliones)”. Zootaxa 3034: 47–68.
[V05] Vasconcelos, E. G. 2005. Notes on Geraecormobius clavifemur (Mello-Leitao, 1927) and description of Geraecormobius reitzi n. sp. (Arachnida: Opiliones: Gonyleptidae). Zootaxa 1088: 1–10.