Notomastus, M. Sars, 1851

García-Garza, María Elena, León-González, Jesús Angel De & Tovar-Hernández, María Ana, 2019, Catalogue of Notomastus M. Sars, 1851 (Annelida, Capitellidae) and the description of a new species from the Gulf of California, Zootaxa 4577 (2), pp. 249-273 : 268-269

Key to species of Notomastus from the Gulf of California

1 First segment biramous................................................................................. 2 - First segment uniramous; fused notopodia; digitiform, dorsal branchiae....................... N. mazatlanensis sp. nov. 2 Thoracic bundles of chaetae inserted laterally............................................................... 3 - Anterior thoracic bundles of chaetae inserted laterally, then gradually inserted towards dorsum on the last posterior segments 5 3 Abdominal notopodial lobes fused............................ N. angelicae Hernández-Alcántara & Solís-Weiss, 1998 - Abdominal notopodial lobes separated..................................................................... 4 4 All thoracic segments tessellated.................................................... N. sonorae Kudenov, 1975 - Some thoracic segments tessellated.............................. N. landini García-Garza & de León-González, 2015 5 Abdominal notopodial lobes fused........................................................................ 6

- Abdominal notopodial lobes separated.............................................. N. abyssalis Fauchald, 1972

6 Abdominal notopodial lobes with digitiform endings; dorsal papillae dispersed in abdominal segments............................................................................ N. fauchaldi García-Garza & de León-González, 2015

- Abdominal notopodial lobes without digitiform endings; dorsal papillae absent..................................... 7

7 Abdominal neuropodial lobes robust, expanded towards dorsal side.... N. lobulatus García-Garza & de León-González, 2015

- Abdominal neuropodial lobes not expanded dorsally.......................................................... 8

8 Noto- and neuropodium forming a high ridge around abdominal segments..................... N. cinctus Fauchald, 1972

- Noto- and neuropodium without ridges in abdominal segments............................. N. precocis Hartman, 1960