-82.933, 9.05: 11 Treatments

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Ariadna reginae   new species  Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 87-90 87-90
Adelomyrmex tristani     Fernández, F., 2003, Revision of the myrmicine ants of the Adelomyrmex genus-group (Hymenoptera: Formicidae)., Zootaxa 361, pp. 1-52: 30-33 30-33
Myrmelachista joycei   NEW SPECIES  Longino, J. T., 2006, A taxonomic review of the genus Myrmelachista (Hymenoptera: Formicidae) in Costa Rica., Zootaxa 1141, pp. 1-54: 25-28 25-28
Argia elongata   n. sp.  Garrison, Rosser W. & Ellenrieder, Natalia Von, 2017, New species of the damselfly genus Argia from Mexico, Central America and Ecuador with an emphasis on Costa Rica (Insecta: Odonata: Coenagrionidae), Zootaxa 4235 (1), pp. 1-93: 14-21 14-21
Nops tico   new species  Sánchez-Ruiz, Alexander & Brescovit, Antonio D., 2018, A revision of the Neotropical spider genus Nops MacLeay (Araneae: Caponiidae) with the first phylogenetic hypothesis for the Nopinae genera, Zootaxa 4427 (1), pp. 1-121: 61-64 61-64
Phanolinopsis metaksenios   new species  Chatzimanolis, Stylianos, 2017, And then there were six: a revision of the genus Phanolinopsis Scheerpeltz (Coleoptera: Staphylinidae: Staphylininae), Zootaxa 4323 (1), pp. 49-67: 62-64 62-64
Phanolinopsis discedens     Chatzimanolis, Stylianos, 2017, And then there were six: a revision of the genus Phanolinopsis Scheerpeltz (Coleoptera: Staphylinidae: Staphylininae), Zootaxa 4323 (1), pp. 49-67: 54-57 54-57
Orasema arimbome   n. sp.  Burks, Roger A., Heraty, John M., Dominguez, Chrysalyn & Mottern, Jason L., 2018, Complex diversity in a mainly tropical group of ant parasitoids: Revision of the Orasema stramineipes species group (Hymenoptera: Chalcidoidea: Eucharitidae), Zootaxa 4401 (1), pp. 1-107: 16-19 16-19
Protoptila orotina subsp. orotina     Holzenthal, Ralph W. & Blahnik, Roger J., 2006, The caddisfly genus Protoptila in Costa Rica (Trichoptera: Glossosomatidae), Zootaxa 1197, pp. 1-37: 25-37 25-37
Myrmelachista zeledoni     Longino, J. T., 2006, A taxonomic review of the genus Myrmelachista (Hymenoptera: Formicidae) in Costa Rica., Zootaxa 1141, pp. 1-54: 46-48 46-48
Myrmelachista longiceps   NEW SPECIES  Longino, J. T., 2006, A taxonomic review of the genus Myrmelachista (Hymenoptera: Formicidae) in Costa Rica., Zootaxa 1141, pp. 1-54: 33-36 33-36