Lyria

Merle, Didier, Pacaud, Jean-Michel, Métais, Grégoire, Bartolini, Annachiara, Lashari, Rafiq A., Brohi, Imdad A., Solangi, Sarfraz H., Marivaux, Laurent & Welcomme, Jean-Loup, 2014, Volutidae (Mollusca: Gastropoda) of the Lakhra Formation (Earliest Eocene, Sindh, Pakistan): systematics, biostratigraphy and paleobiogeography, Zootaxa 3826 (1), pp. 101-138 : 107

Lyria sp.

( Fig. 4A )

Description. Fragment of a narrow spire, H 14.8, D 9.0 mm. Protoconch eroded, probably paucispiral. Teleoconch of four whorls, the last broken. Whorls high, weakly convex, delineated by a deep, linear suture. Axial sculpture of strong but narrowly rounded costae, almost corresponding from whorl to whorl. No spiral sculpture. Costae opisthocline, rather straight. Columella with at least three folds.

Material. 1 spm (stn 5: CPAG.RAN. I.1, cast MNHN.F. A50339 ).

Comments. Although the aperture of this specimen is lacking, the shape of its teleoconch whorls is similar to those found in other members of Lyria , as for example in Lyria subturgidula (d’Orbigny, 1850) from the Middle Eocene of the Paris Basin. By its high whorls and its straight costae, this specimen is easily distinguishable from Lyria cossmanni Vredenburg, 1923 (=? L. feddeni Vredenburg, 1923 ) from the Lakhra Formation and from Lyria samanaensis Cox, 1930 from the Hangu Formation (Samana Range, North Pakistan). Both species belong to another genus, Lyriopsis nov. gen., described below.

Stratigraphic range. Lakhra Formation: Lakhra Dome.

Figures

FIGURE 4. A. Lyria sp., CPAG. RAN. I. 1, stn 5; B – H. Mitreola brohii sp. nov., B – C (holotype, CPAG. RAN. I. 2, ventral (B) and dorsal (C) views, stn 4), D (paratype 1, CPAG RAN. I. 3, ventral view, stn 4), E – F (paratype 2, CPAG. RAN. I. 4, ventral (E) and dorsal (F) views, stn 4), G – H (paratype 3, CPAG. RAN. I. 5, juvenile, ventral view (G) and enlarged view of the spire (H), stn 4); I – K. Lyriopsis cossmanni (Vredenburg, 1923), I – J (CPAG. RAN. I. 6, ventral view (I) and enlarged view of the spire (J), stn 4), K (CPAG. RAN. I. 7, ventral view, stn 4); L. Lyrischapa haimei (d’Archiac & Haime, 1853), CPAG. RAN. I. 8, ventral view, stn 6; M – N. Lyrischapa sismondai (d’Archiac & Haime, 1853), M (CPAG. RAN. I. 10, ventral view, stn 6), N (CPAG. RAN. I. 9, dorsal view, stn 3). Scale bars: B – G, I, K – N = 10 mm; A, H, J = 5 mm.