Haedropleura septangularis
(Montagu, 1803)
British Isles to Biafra Bight, Azores to Mediterranean.
Predator in the infralittoral.
Original taxon: Murex septangularis.
Synonyms: ginnania, heptagona, maltzani, rigida…
 
The shell of the true septangularis differs from that of secalina by its protoconch: multispiral in septangularis (more than two whorls before the first radial folds) with a minute egg-shell, vs. paucispiral in secalina with a globose and big starting.

Above: 6m deep, Bozcaada island, Çanakkale province, W. Marmara, NW. Turkey. 8,2mm.
The operculum and the small embryonic whorl in a specimen pictured by I. Nestares Pleguezuelo (ES).
– (CC BY-NC-SA) –

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