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difficilis, Taxa Only, Exact Match: 99 Treatments

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Dubiaranea difficilis     Cajade, Manuel, Hagopián, Damián, Rodrigues, Everton N. L., Guerrero, José C., Laborda, Álvaro & Simó, Miguel, 2024, A new species and new records of the spider genus Dubiaranea (Araneae, Linyphiidae) from southern Brazil and Uruguay, with an analysis of the potential distribution of the species, Zootaxa 5437 (2), pp. 223-244 : 236-238 236-238
Miscophus difficilis     Kumar, P. Girish, Mawadda, N. V. Ayisha, Terine, Joshua B. & Amal, S., 2024, Review of the genus Miscophus Jurine, 1807 (Hymenoptera: Crabronidae: Crabroninae) of the Indian subcontinent with descriptions of two new species from southern India, Zootaxa 5418 (5), pp. 589-600 : 590 590
Mansoa difficilis     Costa, Swami Leitão, Johanes, Isabella, Lohmann, Lúcia Garcez & Melo, José Iranildo Miranda de, 2022, Flora da Paraíba (Brasil): Bignonieae (Bignoniaceae), Iheringia, Série Botânica (e 2022019) 77, pp. 1-25 : 20-22 20-22
Cataulacus difficilis     Jimoh, Bunmi Omowumi, Gomez, Kiko, Kemabonta, Kehinde Abike, Wakanjuola, Winifred Ayinke, Phiri, Ethel Emmarantia & Mothapo, Palesa Natasha, 2024, A checklist of Nigerian ants (Hymenoptera, Formicidae): a review, new records and exotic species, Biodiversity Data Journal 12, pp. 99555-99555 : 99555 99555
Stictogrtllacris difficilis   comb. nov.  Cadena-Castañeda, Oscar J., 2019, A proposal towards classification of the Raspy Crickets (Orthoptera: Stenopelmatoidea: Gryllacrididae) with zoogeographical comments: An initial contribution to the higher classification of the Gryllacridines, Zootaxa 4605 (1), pp. 1-100 : 21 21
Mansoa difficilis     Hentz Júnior, Elmar J., Lohmann, Lúcia G., Caxambu, Marcelo G., Temponi, Lívia G. & Pires Lima, Laura C., 2022, Floristic Inventory of the Iguaçu and Iguazú National Parks (Brazil and Argentina): Bignoniaceae, Phytotaxa 570 (2), pp. 165-192 : 184 184
Technomyrmex (Mayri) albipes subsp. difficilis     Forel, A., 1909, Fourmis du Musée de Bruxelles. Fourmis de Benguela récoltées par M. Creighton Wellman, et fourmis du Congo récoltées par MM. Luja, Kohl et Laurent., Annales de la Societe Entomologique de Belgique 53, pp. 51-73 : 55 55
Stenus (Stenus) difficilis     Webster, Reginald P., Davies, Anthony E., Klimaszewski, Jan & Bourdon, Caroline, 2016, Further contributions to the staphylinid fauna of New Brunswick, Canada, and the USA, with descriptions of two new Proteinus species (Coleoptera, Staphylinidae), ZooKeys 573, pp. 31-83 : 60 60
Fromundus difficilis     Krüger, Andreas & Lis, Jerzy A., 2019, Notes on Afrotropical Cydnidae (Heteroptera) with emphasis on vehicle-mounted net samples and description of a new species from Liberia, West Africa, Zootaxa 4559 (3), pp. 559-567 : 563 563
Taphrocerus difficilis     Westcott, Richard L. & Hespenheide, Henry A., 2006, The description of a new species of Agrilus Curtis, with distributional records, and taxonomic and biological notes for Agrilinae and Trachyinae (Coleoptera: Buprestidae) of Mexico and Central America, Zootaxa 1367, pp. 1-35 : 33 33
Aulacaspis difficilis     Zuparko, Robert L., 2015, Annotated Checklist of California Encyrtidae (Hymenoptera), Zootaxa 4017 (1), pp. 1-126 : 94-97 94-97
Chydaeus bedeli subsp. difficilis     Kataev, Boris M., Wrase, David W. & Schmidt, Joachim, 2014, New species of the genus Chydaeus from China, Nepal, Myanmar, and Thailand, with remarks on species previously described (Coleoptera: Carabidae: Harpalini), Zootaxa 3765 (1), pp. 1-28 : 6 6
Sphaeropthalma difficilis     Wilson, Joseph S., 2017, Nocturnal Velvet Ants (Hymenoptera: Mutillidae) of Joshua Tree National Park, Riverside County, California with the description of three new species, Zootaxa 4319 (2), pp. 329-367 : 353-354 353-354
Agrilus difficilis     Hallinen, Marie J., Steffens, Wayne P., Schultz, Jennifer L. & Aukema, Brian H., 2021, The Buprestidae (Coleoptera) of Minnesota, with a Discussion of the Emerald Ash Borer, Agrilus planipennis Fairmaire, The Coleopterists Bulletin 75 (1), pp. 173-190 : 177 177
Tachysphex difficilis     Gadallah, Neveen S., 2020, Biodiversity of the aculeate wasps (Hymenoptera: Aculeata) of the Arabian Peninsula: Apoidea (Spheciformes), Crabronidae, Zootaxa 4754 (1), pp. 20-73 : 20-73 20-73
Calydiscoides difficilis     Justine, Jean-Lou, Beveridge, Ian, Boxshall, Geoffrey A. & Bray, Rod A., 2010, An annotated list of fish parasites (Copepoda, Monogenea, Digenea, Cestoda and Nematoda) collected from Emperors and Emperor Bream (Lethrinidae) in New Caledonia further highlights parasite biodiversity estimates on coral reef fish, Zootaxa 2691, pp. 1-40 : 33 33
Odontomyrme difficilis     Brothers, Denis J., 2022, Critical analysis of the type material of Mutillidae described from the Australasian Region (Hymenoptera), Zootaxa 5140 (1), pp. 1-215 : 207 207
Mesabolivar difficilis     Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, Zootaxa 4395 (1), pp. 1-178 : 111 111
Calydiscoides difficilis     Justine, Jean-Lou, Beveridge, Ian, Boxshall, Geoffrey A. & Bray, Rod A., 2010, An annotated list of fish parasites (Copepoda, Monogenea, Digenea, Cestoda and Nematoda) collected from Emperors and Emperor Bream (Lethrinidae) in New Caledonia further highlights parasite biodiversity estimates on coral reef fish, Zootaxa 2691, pp. 1-40 : 32 32
Cryptophagus difficilis     Majka, Christopher & Langor, David, 2010, Contributions towards an understanding of the Cryptophaginae (Coleoptera, Cryptophagidae) of Atlantic Canada, ZooKeys 35 (35), pp. 13-35 : 20-21 20-21
Rhopalomeces difficilis     Adlbauer, K., Ayalew, Amare, Beck, R. & Drumont, A., 2008, Cerambyciden aus Äthiopien (Coleoptera, Cerambycidae), Linzer biologische Beiträge 40 (2), pp. 1153-1191 : 1168 1168
Peromyscus difficilis     Wilson, Don E. & Reeder, DeeAnn, 2005, Order Rodentia - Family Cricetidae, Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2, Baltimore: The Johns Hopkins University Press, pp. 955-1189 : 1065 1065
Ampulex difficilis     Dollfuss, Hermann, 2017, The Ampulicidae Wasps of the " Biologiezentrum-Linz " - Collection in Linz, Austria, including the Genera Ampulex JURINE, Dolichurus LATREILLE and Trirogma WESTWOOD (Hymenoptera, Apoidea, Ampulicidae), Linzer biologische Beiträge 49 (1), pp. 441-457 : 443-444 443-444
Osmia (Hemiosmia) difficilis     Proshchalykin, M. Yu., Maharramov, M. M. & Aliyev, Kh. A., 2019, New data on the tribe Osmiini (Hymenoptera: Magachilidae) from Azerbaijan, Far Eastern Entomologist 383, pp. 12-20 : 15 15
Neogastropoda   new species  Stahlschmidt, Peter, Poppe, Guido & Tagaro, Sheila, 2018, Descriptions of remarkable new Turrid species from the Philippines, Visaya 5, No. 1, pp. 5-64 : 9 9
Mycotretus difficilis     Pecci-Maddalena, Italo Salvatore de Castro, Lopes-Andrade, Cristiano & Skelley, Paul, 2023, Catalogue of Mycotretus Lacordaire, 1842 (Coleoptera: Erotylidae: Tritomini): an annotated, illustrated and historical approach, European Journal of Taxonomy 876 (1), pp. 1-182 : 124 124
Xantholinus difficilis     Navarrete-Heredia, José Luis, Gómez-Rodríguez, Cecilia & Newton, Alfred F., 2006, Staphylinidae (Insecta: Coleoptera) of the Biologia Centrali-Americana: Current status of the names, Zootaxa 1251 (1251), pp. 1-70 : 38 38
Iberina difficilis     Růžička, Vlastimil, 2022, A review of the spider genus Iberina (Araneae, Hahniidae), Zootaxa 5133 (4), pp. 555-566 : 559-560 559-560
Hahnia difficilis     Candek, Klemen, Gregoric, Matjaz, Kostanjsek, Rok, Frick, Holger, Kropf, Christian, Kuntner, Matjaz, Miller, Jeremy A. & Hoeksema, Bert W., 2013, Targeting a portion of central European spider diversity for permanent preservation, Biodiversity Data Journal 1, pp. 980-980 : 980 980
Dubiaranea difficilis     Rubio, Gonzalo D., Rodrigues, Everton N. L. & Acosta, Luis E., 2010, Description of the male of the spider Dubiaranea difficilis (Araneae: Linyphiidae), with new records and modeling of its potential geographic distribution, Zootaxa 2405 (1), pp. 55-62 : 57-59 57-59
Ceutorhynchus difficilis     Yunakov, Nikolai, Nazarenko, Vitalij, Filimonov, Rostislav & Volovnik, Semyon, 2018, A survey of the weevils of Ukraine (Coleoptera: Curculionoidea), Zootaxa 4404 (1), pp. 1-494 : 112 112
Paraclius difficilis     Capellari, Renato Soares, 2016, FAMILY DOLICHOPODIDAE, Zootaxa 4122 (1), pp. 404-413 : 406 406
Fromundus difficilis     Lis, Jerzy A., Lis, Barbara & Compton, Stephen G., 2016, Chilocoris capensis n. sp., the first species of the genus Chilocoris Mayr, 1865 (Hemiptera: Heteroptera: Cydnidae) recorded in the Republic of South Africa with an annotated checklist of South African burrower bugs, Zootaxa 4147 (5), pp. 564-574 : 569 569
Eclytus (Eclytus) difficilis     Broad, Gavin R., 2016, Checklist of British and Irish Hymenoptera - Ichneumonidae, Biodiversity Data Journal 4, pp. 9042-9042 : 9042 9042
Hymenoptera   new species  Bischoff, Hans, 1921, Monographie der Mutilliden Afrikas, Archiv für Naturgeschichte, Abteilung A 86, No. 4, pp. 481-672 : 561, 577 561, 577
Hahnia difficilis     Candek, Klemen, Gregoric, Matjaz, Kostanjsek, Rok, Frick, Holger, Kropf, Christian & Kuntner, Matjaz, 2013, Targeting a portion of central European spider diversity for permanent preservation, Biodiversity Data Journal 1, pp. 980-980 : 980 980
Pseudovorticella difficilis     Chatterjee, Tapas, Dovgal, Igor & Fernandez-Leborans, Gregorio, 2021, A checklist of ciliates (Ciliophora) inhabiting on cnidarians, Zootaxa 5039 (2), pp. 151-178 : 168 168
Peromyscus difficilis     Guy G. Musser & Michael D. Carleton, 1993, Order Rodentia - Family Muridae, Mammal Species of the World (2 nd Edition), Washington and London: Smithsonian Institution Press, pp. 501-755 : 729-730 729-730
Stenodynerus difficilis     Selis, Marco, Cilia, Giovanni, Wood, Thomas J. & Soon, Villu, 2024, Taxonomic revision of the Stenodynerus fastidiosissimus species-group in Western Europe and North Africa (Hymenoptera: Vespidae: Eumeninae), Zootaxa 5418 (1), pp. 34-56 : 38-39 38-39
Pseudoscorpiones   new species  Vachon, Max, 1941, Pseudoscorpions récoltés en Afrique occidentale tropicale par P. Lepesme, R. Paulian et A. Villiers (Note préliminaire)., Bulletin Scientifique de Bourgogne 9, pp. 29-35 : 31 31
Verrucaria difficilis   sp. nov.  Pykaelae, Juha, Kantelinen, Annina & Myllys, Leena, 2020, Taxonomy of Verrucaria species characterised by large spores, perithecia leaving pits in the rock and a pale thin thallus in Finland, MycoKeys 72, pp. 43-92 : 43 43
Polauchenia difficilis   comb. nov.  Gil-Santana, Helcio R. & Deckert, Juergen, 2021, Transfer of Westermannia difficilis Dohrn to the genus Polauchenia McAtee & Malloch (Hemiptera, Heteroptera, Reduviidae, Emesinae, Emesini), ZooKeys 1043, pp. 103-116 : 103 103
Diptera   new species  Grzegorzek, Adalbert, 1884, Beitrag zur Dipteren-Fauna Galiziens, Kaiserthum Oesterreich, Berliner Entomologische Zeitschrift 28, No. 2, pp. 245-264 : 261-262 261-262
Plicanthus difficilis     Váňa, Jiří, Söderström, Lars, Hagborg, Anders & von Konrat, Matt, 2013, Notes on Early Land Plants Today. 33. Notes on Anastrophyllaceae (Marchantiophyta), Phytotaxa 81 (1), pp. 26-32 : 30 30
Osmia (Hemiosmia) difficilis     Müller, Andreas, 2020, Palaearctic Osmia bees of the subgenera Hemiosmia, Tergosmia and Erythrosmia (Megachilidae, Osmiini): biology, taxonomy and key to species, Zootaxa 4778 (2), pp. 201-236 : 213-214 213-214
Cheilosia difficilis     Barkalov, Anatolij V. & Ståhls, Gunilla, 2022, Cheilosia (Diptera, Syrphidae: Rhingiini) of Nepal with descriptions of 29 new species, European Journal of Taxonomy 829 (1), pp. 1-127 : 32 32
Calydiscoides difficilis     Justine, Jean-Lou, Beveridge, Ian, Boxshall, Geoffrey A. & Bray, Rod A., 2010, An annotated list of fish parasites (Copepoda, Monogenea, Digenea, Cestoda and Nematoda) collected from Emperors and Emperor Bream (Lethrinidae) in New Caledonia further highlights parasite biodiversity estimates on coral reef fish, Zootaxa 2691, pp. 1-40 : 33 33
Deroderus difficilis     Navarrete-Heredia, José Luis, Gómez-Rodríguez, Cecilia & Newton, Alfred F., 2006, Staphylinidae (Insecta: Coleoptera) of the Biologia Centrali-Americana: Current status of the names, Zootaxa 1251 (1251), pp. 1-70 : 46 46
Melzerus difficilis   comb. nov.  Monné, Miguel A., 2005, Catalogue of the Cerambycidae (Coleoptera) of the Neotropical Region. Part II. Subfamily Lamiinae, Zootaxa 1023 (1), pp. 1-760 : 1-760 1-760
Euvira difficilis     Navarrete-Heredia, José Luis, Gómez-Rodríguez, Cecilia & Newton, Alfred F., 2006, Staphylinidae (Insecta: Coleoptera) of the Biologia Centrali-Americana: Current status of the names, Zootaxa 1251 (1251), pp. 1-70 : 20 20
Cerceris difficilis     Gadallah, Neveen S., 2020, Biodiversity of the aculeate wasps (Hymenoptera: Aculeata) of the Arabian Peninsula: Apoidea (Spheciformes), Crabronidae, Zootaxa 4754 (1), pp. 20-73 : 20-73 20-73
Helophorus difficilis     Darilmaz, Mustafa C. & İncekara, Ümit, 2011, Checklist of Hydrophiloidea of Turkey (Coleoptera: Polyphaga), Journal of Natural History 45 (11 - 12), pp. 685-735 : 690 690
Stenodynerus fastidiosissimus subsp. difficilis     Yildirim, E. & Gusenleitner, J., 2007, The present situation of the Vespidae-fauna of Turkey (Hymenoptera: Vespidae), Linzer biologische Beiträge 39 (1), pp. 105-109 : 107 107
Sphaeropthalma difficilis     Boehme, Nicole F., Tanner, David A., Williams, Kevin A. & Pitts, James P., 2012, Faunal study of velvet ants (Hymenoptera: Mutillidae) and their activity patterns and habitat preference at Ash Meadows National Wildlife Refuge, Nye County, Nevada, USA, Zootaxa 3587, pp. 1-45 : 28-29 28-29
Pseudachorutes difficilis     Silveira, Tatiana Cristina Da & Mendonça, Maria Cleide De, 2019, Checklist of Poduromorpha (Collembola: Hexapoda) from Rio de Janeiro, Brazil, Zootaxa 4656 (3), pp. 572-590 : 584 584
Osmia (Hemiosmia) difficilis     Boustani, Mira, Rasmont, Pierre, Dathe, Holger H., Ghisbain, Guillaume, Kasparek, Max, Michez, Denis, Müller, Andreas, Pauly, Alain, Risch, Stefan, Straka, Jakub, Terzo, Michael, Achter, Xavier Van, Wood, Thomas J. & Nemer, Nabil, 2021, The bees of Lebanon (Hymenoptera: Apoidea: Anthophila), Zootaxa 4976 (1), pp. 1-146 : 57-58 57-58
Melzerus difficilis     De Barros, Rafael C., Da Fonseca, Mailson G., Vendramini, Vinicius E. & De Arvarenga Julio, Carlos E., 2019, Species of Lamiinae (Insecta, Coleoptera, Cerambycidae) from east Paraná State (Brazil), with new geographic records, Zootaxa 4545 (2), pp. 179-204 : 187 187
Toxomerus difficilis     Borges, Zuleica M. & Couri, Marcia S., 2009, Revision of Toxomerus Macquart, 1855 (Diptera: Syrphidae) from Brazil with synonymic notes, identification key to the species and description of three new species 2179, Zootaxa 2179, pp. 1-72 : 28-29 28-29
Chorebus difficilis     Broad, Gavin R., Shaw, Mark R. & Godfray, H. Charles J., 2016, Checklist of British and Irish Hymenoptera - Braconidae, Biodiversity Data Journal 4, pp. 8151-8151 : 8151 8151
Gymnetis hebraica subsp. difficilis     Orozco, Jesus & Pardo-Locarno, Luis Carlos, 2004, Description of immature stages of three species of American Cetoniinae (Coleoptera: Scarabaeidae: Cetoniinae), Zootaxa 769, pp. 1-14 : 3-6 3-6
Osmia difficilis     Müller, Andreas, 2020, Palaearctic Osmia bees of the subgenera Hemiosmia, Tergosmia and Erythrosmia (Megachilidae, Osmiini): biology, taxonomy and key to species, Zootaxa 4778 (2), pp. 201-236 : 210 210
Mutilla difficilis   new species  Bischoff, Hans, 1921, Monographie der Mutilliden Afrikas, Archiv für Naturgeschichte, Abteilung A 86, No. 5, pp. 673-830 : 684, 694, 823 684, 694, 823
Parapontophilus difficilis   sp. nov.  Komai, Tomoyuki, 2008, A world-wide review of species of the deepwater crangonid genus Parapontophilus Christoffersen, 1988 (Crustacea, Decapoda, Caridea), with descriptions of ten new species, Zoosystema 30 (2), pp. 261-332 : 297-302 297-302
Iberina difficilis     Naumova, Maria, Blagoev, Gergin & Deltshev, Christo, 2021, Fifty spider species new to the Bulgarian fauna, with a review of some dubious species (Arachnida: Araneae), Zootaxa 4984 (1), pp. 228-257 : 237 237
Xerolinus difficilis   comb. nov.  Ivie, Michael A. & Hart, Charles J., 2016, Redefinition ofDiastolinusMulsant and Rey, with a Review of West Indian Blapstinoid Genera (Coleoptera: Tenebrionidae: Opatrini), The Coleopterists Bulletin 70 (3), pp. 447-481 : 447-481 447-481
Lycoriella difficilis var. obscuratipes     Menzel, Frank, Smith, Jane E. & Chandler, Peter J., 2006, The sciarid fauna of the British Isles (Diptera: Sciaridae), including descriptions of six new species, Zoological Journal of the Linnean Society 146 (1), pp. 1-147 : 114 114
Catachlorops difficilis     Wolff, Marta & Miranda-Esquivel, Daniel Rafael, 2016, FAMILY TABANIDAE, Zootaxa 4122 (1), pp. 249-301 : 262 262
Aphaereta difficilis     Gadallah, Neveen S., Ghahari, Hassan, Peris-Felipo, Francisco Javier & Fischer, Maximilian, 2015, An annotated catalogue of the Iranian Alysiinae (Hymenoptera: Braconidae), Zootaxa 3974 (1), pp. 1-28 : 3 3
Stroudia difficilis     J. M, Gusenleitner, J. & Madl, M., 2010, A Catalogue of the Eumeninae (Hymenoptera: Vespidae) of the Ethiopian Region excluding Malagasy Subregion. Part II: Genera Delta de SAUSSURE 1885 to Zethus FABRICIUS 1804 and Species Incertae Sedis, Linzer biologische Beiträge 42 (1), pp. 95-315 : 243 243
Labiobaetis difficilis     Kaltenbach, Thomas & Gattolliat, Jean-Luc, 2019, The tremendous diversity of Labiobaetis Novikova & Kluge in Indonesia (Ephemeroptera, Baetidae), ZooKeys 895, pp. 1-117 : 1 1
Carpelimus difficilis     Webster, Reginald P., Davies, Anthony E., Klimaszewski, Jan & Bourdon, Caroline, 2016, Further contributions to the staphylinid fauna of New Brunswick, Canada, and the USA, with descriptions of two new Proteinus species (Coleoptera, Staphylinidae), ZooKeys 573, pp. 31-83 : 48 48
Ochthebius (Ochthebius) difficilis     Salah, Mohamed, Cueto, Juan Antonio Régil & Valladares, Luis F., 2014, An annotated checklist of the aquatic Polyphaga (Coleoptera) of Egypt I. Family Hydraenidae, Zootaxa 3873 (3), pp. 275-284 : 280 280
Campiglossa difficilis     Merz, B. & Kofler, A., 2008, Fruchtfliegen aus Osttirol und Kärnten (Österreich) (Diptera: Tephritidae), Linzer biologische Beiträge 40 (2), pp. 1211-1224 : 1215 1215
Pseudovorticella difficilis     Mayén-Estrada, Rosaura & Pinto Utz, Laura R., 2018, A checklist of species of Vorticellidae (Ciliophora: Peritrichia) epibionts of crustaceans, Zootaxa 4500 (3), pp. 301-328 : 309-310 309-310
Technomyrmex mayri subsp. difficilis     Santschi, F., 1930, Description de formicides éthiopiens nouveaux ou peu connus. V., Bulletin et Annales de la Societe Entomologique de Belge 70, pp. 49-77 : 72-73 72-73
Agrilus difficilis     Barringer, Lawrence, 2020, New records of woodboring beetles (Coleoptera: Buprestidae) for the eastern United States, Insecta Mundi 746, pp. 1-25 : 4 4
Aphaereta difficilis     Papp, J., 2007, Braconidae (Hymenoptera) From Korea Xxii. Subfamily Alysiinae, Acta Zoologica Academiae Scientiarum Hungaricae 53 (1), pp. 1-38 : 4 4
Galesus (Schizogalesus) difficilis     Notton, David G., 2014, A catalogue of the types of Diapriinae (Hymenoptera, Diapriidae) at the Natural History Museum, London, European Journal of Taxonomy 75, pp. 1-123 : 92-93 92-93
Ochthebius (Ochthebius) difficilis     Lamine, Smail, Lounaci, Abdelkader & Bennas, Nard, 2019, Biodiversity and chorology of aquatic beetles (Coleoptera: Elmidae and Hydraenidae) in Kabylia (central-north Algeria). New records and updates, Zootaxa 4700 (1), pp. 102-116 : 109 109
Campiglossa difficilis     Namin, Saeed Mohamadzade & Korneyev, Valery A., 2018, An annotated checklist of fruit flies (Diptera: Tephritidae) of Iran, Zootaxa 4369 (3), pp. 377-405 : 387 387
Peromyscus difficilis     García-Prieto, Luis, Falcón-Ordaz, Jorge & Guzmán-Cornejo, Carmen, 2012, Helminth parasites of wild Mexican mammals: list of species, hosts and geographical distribution 3290, Zootaxa 3290 (1), pp. 1-92 : 62 62
Characiformes   new species  Marini, T. L., Nichols, J. T. & La Monte, F. R., 1933, Six new eastern South American fishes examined in the American Museum of Natural History, American Museum Novitates 618, pp. 1-7 : 6 6
Monepidosis difficilis     Jaschhof, Mathias & Jaschhof, Catrin, 2020, The Porricondylini (Diptera: Cecidomyiidae: Porricondylinae) of Sweden revisited: descriptions of nineteen new species of ten genera, including a new genus, Zootaxa 4728 (2), pp. 151-182 : 160 160
Chrysolina difficilis subsp. yezoensis     Cho, H. - W. & An, S. L., 2020, AN ANNOTATED CHECKLIST OF LEAF BEETLES (COLEOPTERA: CHRYSOMELIDAE) OF KOREA, WITH COMMENTS AND NEW RECORDS, Far Eastern Entomologist 404, pp. 1-36 : 11 11
Iridomyrmex difficilis   sp. nov.  Heterick, Brian E. & Shattuck, Steve, 2011, Revision of the ant genus Iridomyrmex (Hymenoptera: Formicidae) 2845, Zootaxa 2845 (1), pp. 1-174 : 73-75 73-75
Stenodynerus fastidiosissimus subsp. difficilis     Gusenleitner, J., 2013, Die Gattungen der Eumeninae im Nahen Osten, in Nordafrika und in Arabien (Hymenoptera: Vespidae: Eumeninae), Linzer biologische Beiträge 45 (1), pp. 5-107 : 78 78
Technomyrmex mayri subsp. difficilis   n. st.  Forel, A., 1892, Hymenopteres 2 (supplement au 28 fascicule). Les Formicides., Histoire physique, naturelle et politique de Madagascar. 20., Paris: Unknown Publisher, pp. 232-280 : 242 242
Promitobates difficilis     Bragagnolo, Cibele & Pinto-Da-Rocha, Ricardo, 2012, Systematic review of Promitobates Roewer, 1913 and cladistic analysis of Mitobatinae Simon, 1879 (Arachnida: Opiliones: Gonyleptidae), Zootaxa 3308, pp. 1-48 : 16-17 16-17
Xeniades difficilis     Zhang, Jing, Cong, Qian, Shen, Jinhui & Grishin, Nick V., 2022, Taxonomic changes suggested by the genomic analysis of Hesperiidae (Lepidoptera), Insecta Mundi 2022 (921), pp. 1-135 : 50 50
Ochthebius difficilis     Ertorun, Nesil, Jäch, Manfred A., Kasapoġlu, Ahmet & Darilmaz, Mustafa C., 2011, Checklist of the Hydraenidae (Coleoptera) of Turkey, with notes on distribution, Zootaxa 3055 (1), pp. 22-42 : 35 35
Calydiscoides difficilis     Justine, Jean-Lou, Beveridge, Ian, Boxshall, Geoffrey A. & Bray, Rod A., 2010, An annotated list of fish parasites (Copepoda, Monogenea, Digenea, Cestoda and Nematoda) collected from Emperors and Emperor Bream (Lethrinidae) in New Caledonia further highlights parasite biodiversity estimates on coral reef fish, Zootaxa 2691, pp. 1-40 : 33 33
Plicanthus difficilis     Söderström, Lars, Hagborg, Anders & Konrat, Matt Von, 2016, Early Land Plants Today: Index of Liverworts & Hornworts 2013 - 2014, Phytotaxa 269 (3), pp. 133-185 : 160 160
Anthrax difficilis   new species  Meigen, Johann Wilhelm, 1820, Systematische Beschreibung der bekannten europäischen zweiflügeligen Insekten. Zweiter Theil., F. W. Forstmann : 167 167
Aulacaspis difficilis     Suh, Soo-Jung, 2013, On the armored scales, genus Aulacaspis Cockerell (Hemiptera: Diaspididae), of Korea, Insecta Mundi 2013 (295), pp. 1-8 : 2 2
Panorpa difficilis     Li, Ning, Wang, Ji-Shen & Hua, Bao-Zhen, 2021, Morphological phylogenetic analyses and taxonomic revision of the Panorpa davidi group (Mecoptera: Panorpidae), Arthropod Systematics & amp; Phylogeny 79, pp. 309-342 : 309 309
Sphaeropthalma difficilis     Pitts, James P., Wilson, Joseph S., Williams, Kevin A. & Boehme, Nicole F., 2010, Nocturnal velvet ant males (Hymenoptera: Mutillidae) of Deep Canyon, California including four new species and a fifth new species from Owens Lake Valley, California, Zootaxa 2553, pp. 1-34 : 21 21
Fromundus difficilis     Krüger, Andreas & Deckert, Jürgen, 2016, True bugs (Hemiptera-Heteroptera) of Botswana — Bibliographical inventory and new records, Zootaxa 4114 (1), pp. 33-63 : 46 46
Kokkocynips difficilis   comb. nov.  Nieves-Aldrey, José Luis, Nicholls, James A., Tang, Chang-Ti, Melika, George, Stone, Graham N., Pujade-Villar, Juli, Buffington, Matthew, Maldonado, Yurixi & Medianero, Enrique, 2021, Re-description and systematic re-appraisal of the genus Kokkocynips Pujade-Villar & Melika, (Hymenoptera: Cynipidae: Cynipini), including new combinations of Nearctic species and the description of a new species from Panama, Zootaxa 4938 (2), pp. 205-232 : 224-226 224-226
Peromyscus difficilis     James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Rodentia (Part 3), Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA: Alien Press, Inc. & The Association of Systematics Collections, pp. 392-476 : 449 449

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Specimens