Mecolaesthus is a genus of cellar spiders that was first described by Eugène Louis Simon in 1893.

Species it contains forty species, found in South America, Dominica, on Saint Vincent and the Grenadines, Trinidad and Tobago, and Guadeloupe: Mecolaesthus alegria Huber, 2020 – Venezuela Mecolaesthus anzu Huber, 2023 – Ecuador Mecolaesthus arepa Huber, 2020 – Venezuela Mecolaesthus arima Huber, 2000 – Trinidad Mecolaesthus azulita Huber, 2000 – Venezuela Mecolaesthus bienmesabe Huber, 2020 – Venezuela Mecolaesthus cachapa Huber, 2020 – Venezuela Mecolaesthus chicha Huber, 2020 – Venezuela Mecolaesthus chuwitayo Huber, 2023 – Ecuador Mecolaesthus cordiformis (González-Sponga, 2009) – Venezuela Mecolaesthus cornutus Huber, 2000 – Venezuela Mecolaesthus discrepantis (González-Sponga, 2003) – Venezuela Mecolaesthus fallax Huber, 2020 – Venezuela Mecolaesthus grandis (González-Sponga, 2009) – Venezuela Mecolaesthus graphorn Huber, 2020 – Venezuela Mecolaesthus guasacaca Huber, 2020 – Venezuela Mecolaesthus hoti Huber, 2000 – Venezuela Mecolaesthus lechosa Huber, 2020 – Venezuela Mecolaesthus lemniscatus (Simon, 1894) – St. Vincent Mecolaesthus limon Huber, 2020 – Venezuela Mecolaesthus longipes Huber, 2020 – Venezuela Mecolaesthus longissimus Simon, 1893 (type) – Venezuela Mecolaesthus misahualli Huber, 2023 – Ecuador Mecolaesthus mucuy Huber, 2000 – Venezuela Mecolaesthus multidenticulatus (González-Sponga, 2003) – Venezuela Mecolaesthus nigrifrons (Simon, 1894) – St. Vincent Mecolaesthus niquitanus (González-Sponga, 2011) – Venezuela Mecolaesthus parchita Huber, 2020 – Venezuela Mecolaesthus peckorum Huber, 2000 – Venezuela Mecolaesthus piedras Huber, 2020 – Venezuela Mecolaesthus puntiagudus (González-Sponga, 2003) – Venezuela Mecolaesthus pusillus Huber, 2020 – Venezuela Mecolaesthus putumayo Huber, 2000 – Colombia Mecolaesthus quasimodo Huber, 2023 – Ecuador Mecolaesthus tabay Huber, 2000 – Venezuela Mecolaesthus taino Huber, 2000 – Guadeloupe, Dominica Mecolaesthus trampa Huber, 2020 – Venezuela Mecolaesthus tuberculosus (González-Sponga, 2009) – Venezuela Mecolaesthus yawaperi Huber, 2000 – Brazil Mecolaesthus yerbatero Huber, 2020 – Venezuela

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