Apomatus giganteus Iroso, 1921 accepted as Apomatus ampulliferus Philippi, 1844 (original description)
Eupomatus helmatus Iroso, 1921 accepted as Hydroides helmata (Iroso, 1921) (original description)
Hydroides pectinata (Philippi, 1844) (taxonomy source)
Hydroides pectinata dioperculata Iroso, 1921 accepted as Hydroides elegans (Haswell, 1883) [nomen protectum] (original description)
Hydroides rostrata Iroso, 1921 [original] accepted as Hydroides floridana (Bush, 1910) (original description)
Hypsicomus caecus Iroso, 1921 accepted as Hypsicomus phaeotaenia (Schmarda, 1861) accepted as Notaulax phaeotaenia (Schmarda, 1861) (original description)
Pomatoceros globiger Iroso, 1921 accepted as Pomatoceros lamarcki (Quatrefages, 1866) accepted as Spirobranchus lamarcki (Quatrefages, 1866) (original description)
Potamilla obscura Iroso, 1921 accepted as Pseudopotamilla reniformis (Bruguière, 1789) (original description)
Potamilla oligophthalma Iroso, 1921 accepted as Pseudopotamilla saxicava (Quatrefages, 1866) (original description)
Potamilla troncatula Iroso, 1921 accepted as Pseudopotamilla reniformis (Bruguière, 1789) (original description)
Protula pallida Iroso, 1921 accepted as Protula intestinum (Lamarck, 1818) (original description)
Protula rubra Iroso, 1921 accepted as Protula intestinum (Lamarck, 1818) (original description)
Sabella euplaeana Delle Chiaje, 1822 [1828?] accepted as Hydroides euplaeana (Delle Chiaje, 1822 [1828?]) (source of synonymy)
Sabella neapolitana Iroso, 1921 (original description)
Serpula (Hydroides) uncinata non Philippi, sensu Gravier, 1906 accepted as Hydroides heterocera (Grube, 1868) (additional source)
Vermilia incrustata Iroso, 1921 accepted as Vermiliopsis striaticeps (Grube, 1862) (original description)

 Etymology

 for Eupomatus helmatus Iroso, 1921

Derivation of helmatus Latinisation not stated, and usage is almost unique. Author: "Lo scarso numero di esemplari ... [details]

 Grammatical gender

 for Eupomatus helmatus Iroso, 1921

Helm and helmet are not from Latin, though the author's construction appears to be intended as masculine adjectival ... [details]

 Grammatical gender

 for Hydroides helmata (Iroso, 1921)

Zibrowius (1971) used 'helmata' for gender agreement, as Iroso evidently intended her invention of 'helmatus' as an ... [details]

 Taxonomy

 for Hydroides rostrata Iroso, 1921 [original]

nov.nom. suggested for Eupomatus uncinatus sensu Ehlers, 1887, non Philippi, 1844. 'Per Eupomatus uncinatus ... [details]