• Dicolpus Philippi, 1887

might belong to Thersiteidae

Original Description of Dicolpus by Philippi. 1887, p. 40:

• "Testa oblonga vel ovoidea; spira brevis, anfractus ultimus saepe maximus; apertura oblonga vel ovata, basi effusa, haud canaliculata, interdum posterius (s. superius) angustata, labio sc. posterius valde calloso; labrum rectum, bis sinuatum, sinu uno ad suturam, altero coque magis aperto ad medium anfractus ultimi sito; columella haud plicata."

Comment Philippi, 1887, p. 40:

• "Die Schnecken, für welche ich dieses neue Genus errichten zu müssen glaube, nähern sich durch ihre Gestalt gewissen Pleurotomas, z. B. Pl. auriculifera und Pl. imperialis, während die Mündung des Gehäuses an die einiger Arten Cancellaria erinnert, namentlich an C. scalarina und C. trigonostoma, aber sie unterscheiden sich vom ersten Geschlecht dadurch, dass ihnen der Kanal fehlt und vom zweiten durch den Mangel der Falten an der Spindel, sowie von beiden durch die doppelte Einbuchtung der Aussenlippe. Die Höhlung für das Thier war sehr eng."

Species are

• Dicolpus obesus Philippi, 1887
• Dicolpus anculotoides Philippi, 1887
• Dicolpus distortus Philippi, 1887
• Dicolpus striatus Philippi, 1887
• Dicolpus scalaris Philippi, 1887

History and Synonymy

1909

Cossmann, 1909, p. 177:

• "Enfin je considère comme synonyme évident de Canthidomus le G. Dicolpus Phil. (1887. Tert. u. Quart. Verst. Chiles. p. 40) que l'auteur a rapproché soit de Pleurotoma, soit de Cancellaria et qui a tout a fait le galbe court et épineux de M.[Melanopsis] Bouei. D'ailleurs Dicolpus était préemployé dès 1884, par Gerstacker. pour un Insecte."

2017

Coan & Kabat, 2017, p. 42:

• "Also, two of Philippi’s genera, both fossils, are junior homonyms and would require renaming if they are to be used as valid taxa – Plagia Philippi, 1899 [Bivalvia: Bakevillidae], non Meigen, 1838 [Insecta], and Dicolpus Philippi, 1887 [Gastropoda, incertae sedis], non Gerstaecker, 1884 [Insecta]."

Coan & Kabat, 2017, p. 172:

• "Dicolpus – Philippi, 1887a: 40 [1887b: 37], non Gerstaecker, 1884 [Insecta]. Type species Dicolpus obesus Philippi, 1887 (SD Wenz, 1939: 720). Cossmann (1909: 177) listed this as a junior synonym of Canthidomus Swainson, 1840, itself subsequently synonymized with Melanopsis Férussac, 1807 (Pallary, 1916: 76–77). Wenz (1939: 720) initially listed Philippi’s genus as questionably within the freshwater Cerithioidea (Thiaridae), and later (1943: 1227) listed Philippi’s genus as a possible junior synonym of Buccinanops d’Orbigny, 1841 (Nassariidae), but Cernohorsky (1984: 23) made no mention of Dicolpus in connection with Buccianops or any other genus of the Nassariidae. The familial placement of this genus and its species remains uncertain, but it is known from Eocene marine outcrops, so that it is probably not referable to “Melanopsis” or other freshwater taxa (S. N. Nielsen, in litt., 20 Apr. 2015). If it proves to be a useful taxon, it would have to be renamed because it is a junior homonym."

References

• Coan, E.V. & Kabat, A.R. 2017. The malacological contributions of Rudolph Amandus Philippi (1808-1904); Malacologia, 60(1-2): 31-322.
• Cossmann, M., 1909, Essais de paléoconchologie comparée, 8: 1–248, 4 pls., Fulltext
• Kabat, A.R. & Coan, E.V. 2017. The Life and Work of Rudolph Amandus Philippi (1808–1904), Malacologia 60(1–2), 1-30.
• Philippi, 1887. Die Tertiären und Quartären Versteinerungen Chiles; Brockhaus, Leipzig, 266 pp. 58. pls, [Mollusca: pp. 33-216, pls. 1-47]. Published simultaneously in Spanish as 1887b, Los fósiles Terciarios i Cuatarios de Chile. Gobierno de Chile, Santiago, 256 pp. [with added Errata on p. 256, keyed to pagination of Spanish vol.], 58 pls. [Mollusca: pp. 30-209, same pls.], Fulltext