Echinoderella elongata Nyholm, 1947 accepted as Echinoderes elongata (Nyholm, 1947) Karling, 1954 accepted as Echinoderes elongatus (Nyholm, 1947) (original description)
Hapaloderes minimus Zelinka, 1928 accepted as Echinoderes minimus (Zelinka, 1928) (additional source)

Nontype Private uncatalogued, geounit Gullmarn, identified as Pycnophyes communis Zelinka, 1908
Nontype Private uncatalogued, geounit Gullmarn, identified as Pycnophyes communis Zelinka, 1908
Syntype uncatalogued, geounit Gullmarn, identified as Echinoderella elongata Nyholm, 1947
Nontype Private uncatalogued, geounit Gullmarn, identified as Pycnophyes flaveolatus Zelinka, 1908
Nontype Private uncatalogued, geounit Gullmarn, identified as Semnoderes armiger Zelinka, 1928
Nontype Private uncatalogued, geounit Gullmarn, identified as Semnoderes armiger Zelinka, 1928
Nontype uncatalogued, geounit Gullmarn, identified as Hapaloderes gracilis Zelinka, 1928
Nontype uncatalogued, geounit Gullmarn, identified as Hapaloderes minimus Zelinka, 1928
Nontype uncatalogued, geounit Gullmarn, identified as Hapaloderes minutus (Panceri, 1878) Zelinka, 1928
Nontype Private uncatalogued, geounit Gullmarn, identified as Pycnophyes quadridentatus Zelinka, 1928
Nontype Private uncatalogued, geounit Skagerrak, identified as Pycnophyes flagellatus Zelinka, 1928

 Etymology

 for Echinoderella elongata Nyholm, 1947

[The species name was derived from Latin elongatus, elongated, and possibly referred to its elongated trunk.] [details]