Melvill (1918: 148) described: Fossarus eutorniscus from Karachi, Pakistan (NMW n°lb-051). Janssen, Zuschin & Baal (2011: 442) proposed a new systematic position in the genus Conradia because due to its main shell features it looked rather similar to other species assigned to that genus described from Japan and figured by Okutani (2000: p. 83, Pl. 41). However, it cannot be identified with either of these. Rubio, Rolan & Fernandez-Garces (2015) considered Parviturbo dibellai a junior synonym of F. eutorniscus and based on the morphological characters of its protoconch, they concluded that F. eutorniscus was a vitrinellid although the general shape of its teleoconch, the ornamentation and the microsculpture resemble those of the Parviturbo genus. The protoconch of F. eutorniscus has 1.5 whorls, is smooth and develops in two phases; it has probably a planktotrophic development, which would justify the wide distribution of the species (From Karachi to Madagascar). It seems a more typical protoconch of a vitrinellid than a vetigastropod, however, the presence of rounded spiral ridge that borders and delimits the umbilicus, and the columella, with an anterior channel at the base and a shallow anterior notch (characters present in other species recently described as Crosseola marquesensis Rubio & Rolan, 2017; Crosseola madagascarensis Rubio & Rolan, 2017 and Crosseola ordinata Rubio & Rolan, 2017) make us to think that it could be a crosseolid.

= Fossarus eutorniscus Melvill, 1918. Ann. Mag. Nat. Hist. (9) 1: 148, pi. 5, fig. 21 [Type locality: Karachi, Pakistan].
= Parviturbo dibellai Buzzurro & Cecalupo, 2007 "2006". Boll. Malac, 42 (1-4): 27-32. [Type locality: Tacucu, SE Turkey].
= Conradia eutornisca (Melvill, 1918): Janssen, Zuschin&Baal (2011:442).
Type material. Fossarus eutorniscus: syntype deposited in NMW (lb-051) from Karachi, Pakistan (Melvill-Tomlin collection: NMW 1955.158.2510), examined from photograph. Parviturbo dibellai: Holotype deposited in MNHN (MNHN-IM-2000-29773) and 1 paratype in HUJ (HUJ 50847). Examined from a photograph; 1 paratype from Tacucu, Turkey (CAC).
Material examined. 2 s: Turkey: 1 s, the paratype from Tacucu mentioned (CAC). South of Madagascar, Atimo Vatae: 1 s, Baie des Galions, Stn TB11 (25o09.2'S-46°45.4'E), 5-6 m, rock ledge and silt (MNHN).

Known from Karachi, Pakistan (Melvill, 1918); and south of Madagascar; introduced into the Mediterranean Sea at Tacucu (southeast coast of Turkey) and Akko, Haifa e Rosh Hanikra, Israel coast (Buzzurro & Cecalupo, 2007).