Cylorygmus Orchymont, 1933

FIKÁýEK, Martin & VONDRÁýEK, Dominik, 2014, A review of Pseudorygmodus (Coleoptera: Hydrophilidae), with notes on the classification of the Anacaenini and on distribution of genera endemic to southern South America, Acta Entomologica Musei Nationalis Pragae 54 (2), pp. 479-514 : 507-508

Cylorygmus Orchymont, 1933

Known distribution. In South America, the genus contains a single species, C. lineatopunctatus Orchymont, 1933 . It is known from the following localities: CHILE: SANTIAGO: Lo Águila (or Hospital Lo Águila) [33°54ƍS 70°46ƍW] ( MORONI 1985; FikáÞek, unpubl. data); Peñalolén, 14 km SE of Santiago de Chile [33°33ƍ21ƎS 70°31ƍ41.3ƎW] (Newton & Thayer, unpubl. data); Rungua [33°0ƍ24.12ƎS 70°53ƍ20.4ƎW] (FikáÞek, unpubl. data); Quebrada La Plata [33°29ƍ38ƎS 70°53ƍ23ƎW] (FikáÞek, unpubl. data); Rangue [33°51ƍ19ƎS 70°53ƍ11ƎW] (FikáÞek, unpubl.data). VALPARAÍSO: 4 km E of Quebrada Alvarado, 500 m, 33°3ƍS 71°3ƍW (Newton & Thayer, unpubl. data); La Vega vicinity, 940 m, 33°2.71ƍS 71°1.63ƍW (Newton & Thayer, unpubl. data); Parque Nacional La Campana, Sector Granizo, Cajon La Opositora, 685 m, 32°58.78ƍS 71°6.93ƍW (Newton & Thayer, unubl. data); Parque Nacional La Campana, Sector Ocoa, 4.75 km SE of park entrance, “La Cascada”, 870 m, 32°57.7ƍS 71°3.2ƍW (FikáÞek, unpubl. data); Parque Nacional La Campana, Sector Ocoa, vicinity of Quebrada Buitrera, 415 m, 32°55.89ƍS 71°5.1ƍW (Newton & Thayer, unpubl. data); Quillota [32°52ƍS 71°15ƍ0ƎW] ( ORCHYMONT 1933, MORONI 1985, FikáÞek, unpubl. data).

Results of the model of the potential distribution. Number of occurrence points analyzed: 10. Training AUC: 0.995.Treshholds for equal and maximum sensitivity and speci¿city:0.328.Most contributing climatic layers:bio18 – precipitation of warmest quarter of the year (35.7 %), bio19 – precipitation of coldest quarter of the year (24.7 %), bio14 – precipitation of driest month (15.7 %).

Potential distribution. Compared to other hydrophilid endemic genera, a very small area of potential distribution was predicted for Cylorygmus lineatopunctatus . It includes the small part of the Coastal Cordillera from northern Valparaíso Region southwards to the central/ southern O’Higgins Region (i.e. Vizcachas Mts. and the Altos de Cantillana range) and the adjacent foothills. Actual records are known from both these ranges. An additional small area of climatically suitable conditions is predicted in the coastal mountain range of the southernmost Antofagasta province, but actual occurrence there does not seem probable due to large isolation of this area from the southern range of the species and the lack of forests in this area (it is part of the Atacama Desert).

Biology. Collected in leaf accumulations at sides of the streams, either in forested areas or even in small remnants of forests e.g. in deep ravines (Newton & FikáÞek, unpubl. data).