Aplustridae Gray, 1847

Szabó, János & Jaitly, Anand Kumar, 2019, Additional Middle Jurassic gastropods from Kachchh (western India) in the collections of the Banaras Hindu University (Varanasi, India), Fragmenta Palaeontologica Hungarica 36, pp. 3-30 : 25

Family Aplustridae Gray, 1847 ( Bullinidae Gray, 1850 ) Genus? Parvulactaeon Gründel, 1997

Type species – Parvulactaeon spiralocostata Gründel, 1997

Parvulactaeon ? sp.

( Fig. 78)

Material – A poorly preserved, fragile specimen.

Measurements – Inv. No.: BHU 2029I 309; H dam. = 4.3 mm, D = 2.8 mm.

Description – Four teleoconch whorls are available that form a slightly gradate shell. Suture is impressed and accompanied by an indistinct subsutural ramp. Below the ramp, slightly convex whorl surface is formed that smoothly turns into the subglobular base in the last whorl. No information is accessible about the peristome; on the broken apical shell surface, the shell seems anomphalous.

The shell surface has “bulliniform” ornament, i.e. subequally distributed spiral striae cut the surface into nearly uniform strips. No growth lines are observable.

Remarks – In lack of the earliest and latest shell parts, bearing crucial information for a right identification, only the open nomenclature remained, which is based on the general shape. Similar sized and constructed shells are found in Aplustridae and Parvulactaeon is the genus, which may have similar subsutural ramp. Actually, this species may belong even to different family on the basis of the unknown protoconch and peristome characters. Species level identification needs also further specimens and studies.

Occurrence – Fakirwari, Chari Formation, Callovian.