• Aaptos hoshinoi Van Soest, 2024
• Aberranta magnumlanai Santos & Rizzo, 2024
• Aberrapex catarinensis Quadros, 2024
• Aberrapex panamensis Quadros, 2024
• Aborjinia profunda Zograf, Semenchenko & Mordukhovich, 2024
• Abranda xui Y.-Y. Zhang & J.-L. Zhang, 2024
• Abronica payaso A. Y. Kim & Gosliner, 2024
• Abronica turon A. Y. Kim & Gosliner, 2024
• Abyssochrysos quasilissus Simone, 2024
• Abyssocladia aurora Ekins & Wilson, 2024
• Abyssocladia hendrixii Eck, Kröner & Janussen, 2024
• Abyssocladia janusi Ekins & Wilson, 2024
• Abyssocladia johnhooperi Ekins & Wilson, 2024
• Abyssocladia truespacemeni Eck, Kröner & Janussen, 2024
• Acanthais sutii Z. Kovács & Vicián, 2024 † accepted as Penethais sutii (Z. Kovács & Vicián, 2024) †
• Acanthoatractis xinguensis Jesus & Melo in Jesus, Nandyara & Melo, 2024
• Acanthobothrium oceguerai Rodríguez-Ibarra, Adán-Torres, RuizEscobar & Torres-Carrera, 2024
• Acanthochitona barbarae Dell'Angelo, Sosso & Taviani, 2024
• Acanthocyclops borutzkyi Chaban & Alekseev, 2024
• Acanthomira Ekimova, Nikitenko, Stanovova, Schepetov, Antokhina & Á. Valdés, 2024
• Acanthomolgus crassae Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus dokdoicus Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus jei Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus notialis Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus oporinus Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus rugosus Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus taenichaetatus Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthomolgus triplus Lee J., T.J. Lee & I.H. Kim, 2024
• Acanthophrys keeae Ng, Prema & Ravichandran, 2024
• Acanthotetilla noronhensis Fernandez & Hajdu, 2024
• Acar bernardi Zelaya, Güller & Bieler, 2024
• Acarnus hooperi Santos & Menegola, 2024
• Acarnus tupiniquim Ozga & Menegola, 2024
• Acartia ohnoi Ueda, 2024
• Acesta plioiberica Brunetti & Della Bella, 2024 †
• Acetes maratayama Bochini, Costa & Mantelatto, 2024
• Acetes omorii Hanamura, Imai & Hardianto in Hanamura, Hardianto, Fukuchi, Imai, Siow, Kanak, Islam, Tsutsui, Kassim, 2024
• Achaeta florens Schmelz, Chen & Józefowska, 2024
• Achaeta gemmata Schmelz, Chen & Józefowska, 2024
• Acharax haimaensis M. Yang, B.-Q. Li, Z.-B. Gan, D. Dong & X.-Z. Li, 2024
• Aclis corniculata L. Souza, Araújo & Pimenta, 2024
• Aclis pulchra L. Souza, Araújo & Pimenta, 2024
• Acromoldavicus xerophilus Robles & Abolafia, 2024
• Acryptolaria seamountensis Peña Cantero, 2024
• Actaeodes ogasawaraensis Takeda & Komatsu, 2024
• Actenidia Arconada & M. A. Ramos, 2024
• Actenidia baetica Arconada & M. A. Ramos, 2024
• Actinopteria alba Pacaud, 2024 †
• Actumnus ngankeeae Takeda & Komatsu, 2024
• Acusicola rochai Couto, Nunes, Paschoal & Pereira, 2024
• Adalaria boussoleana Ekimova, Grishina & Nikitenko, 2024
• Adeliella debroyeri Souza-Filho, Guedes-Silva & Andrade, 2024
• Admetella levensteini Wu, Kou, Sun, Zhen & Xu, 2024
• Admetella multiseta Wu, Kou, Sun, Zhen & Xu, 2024
• Admetella nanhaiensis Wu, Kou, Sun, Zhen & Xu, 2024
• Admetella undulata Wu, Kou, Sun, Zhen & Xu, 2024
• Adontorhina diaphana Kamenev & Lisitsyna, 2024
• Adontorhina inflata Kamenev & Lisitsyna, 2024
• Aegistohadra jiangrixini Z.-Y. Chen, 2024
• Aegla atropos Bueno & Tavares in Bueno, Camargo, Lobo, Vera-Silva, Tavares & Mantelatto, 2024
• Aegla clotho Bueno & Tavares in Bueno, Camargo, Lobo, Vera-Silva, Tavares & Mantelatto, 2024
• Aegla lachesis Bueno & Tavares in Bueno, Camargo, Lobo, Vera-Silva, Tavares & Mantelatto, 2024
• Aegla schubarti Colavite, Bueno, da Silva & Tavares, 2024
• Aegla urussanga Arantes, Souza-Shibatta & Teixeira, 2024
• Aesopus translucidus K. Monsecour & D. Monsecour, 2024
• Aethisis Xu, Lu & Xu in Xu et al., 2024
• Aethisis turriformis Xu, Lu & Xu in Xu et al., 2024
• Aethozoon flavum Schwaha, Zeppilli, Gonzalez-Casarrubios & Cepeda, 2024
• Afrocaris Corgosinho & Da Rocha, 2024
• Agaronia bernardi Nolf & Hubrecht, 2024
• Agaronia sterica Simone, 2024
• Agathodesmus urbanus Romero-Rincon & Douch, 2024
• Aguadites hexagranula Vega, Garassino, Nyborg & Pasini in Vega, Nyborg, Garassino, Pasini, Aguilar-Pérez, Borges-Sellén, Arano Ruiz, Quintero-Vázquez & Gutiérrez-Domech, 2024 †
• Ahuastra kupanaha Mah, 2024
• Akatopora oviaviculata Håkansson, Gordon & Taylor, 2024 †
• Akoya zhui Vilvens, 2024
• Akoyazara Nakano, Yamamori, B. A. Marshall, S. T. Williams & H. Fukuda, 2024
• Akritogyra crenulata D. G. Herbert, 2024
• Albinaria arcadica hermanni Hirschfelder & Theves, 2024
• Albinaria pseudunicolor H. Nordsieck, 2024
• Alcomon rotungense Mitra & Khamo, 2024
• Alcomon siangense Mitra & Khamo, 2024
• Aldanispirifer selennyakhensis Baranov & Nikolaev, 2024 †
• Alexandrella cedrici Souza-Filho, Guedes-Silva & Andrade, 2024
• Alfahariella Quiñonero-Salgado, López-Soriano, Raven, Glöer & Prieto, 2024
• Alfahariella panxampla Quiñonero-Salgado, López-Soriano, Raven, Glöer & Prieto, 2024
• Alisigemmula Kantor, Bouchet, Fedosov, Puillandre & Zaharias, 2024
• Alisigemmula astrolabiensis Kantor, Bouchet, Fedosov, Puillandre & Zaharias, 2024
• Allocreadium anastasii Vainutis, 2024
• Allocreadium macrolecithum Vainutis, 2024
• Allopeas agnolini Miquel, 2024 †
• Allopinna Yancey, 2024 †
• Allopinna godleskya Yancey, 2024 †
• Alluviobolus omega Wesener, 2024
• Alobophora sandrae Cajiao-Mora & Bullard in Cajiao-Mora, Brule, Warren, Ksepka, Dutton & Bullard, 2024
• Alopia bogatensis laevior H. Nordsieck, 2024
• Alopia canescens striicollis H. Nordsieck, 2024
• Alpheus berumeni Anker, 2024
• Alpheus caigeri Anker, 2024
• Alpheus cangiopalus Marin & Thinh, 2024