Belongs within: Cerithiimorpha. The Siliquariidae are a family of sessile gastropods, living embedded within sponges with their aperture protruding for filter feeding. The shell is loosely coiled, generally with the first few whorls close but later whorls becoming uncoiled. This part of the shell can easily be confused with that of a tube worm, and… Continue reading Siliquariidae


Belongs within: Cerithiimorpha. The Melanopsidae are a group of freshwater snails with a disjunct distribution in the western Palaearctic and New Zealand. They have an ovate or elongate conical shell that is smooth or ornamented with nodulose ribs. Though modern species are only found in fresh water, fossil representatives may have inhabited brackish or shallow… Continue reading Melanopsidae


Belongs within: Turritellidae. Zeacolpus is a predominantly New Zealand genus of turritellid gastropods (with Z. bartoni known from the Eocene of Western Australia) characterised by a paucispiral apex of one whorl and a sculpture of spiral cords (Finlay 1927a). <==Zeacolpus Finlay 1927 [Zeacolpini]W93 | i. s.: Z. albolapis (Finlay 1924)F27a [=Turritella albolapisF27a, T. concava Hutton… Continue reading Zeacolpus


Belongs within: Cerithiimorpha. The Fossarinae are a group of small marine snails whose shells usually have a large body whorl, open umbilicus and strong spiral sculpture. In which I am defeated by shells Published 12 January 2009 I knew this day was coming. Every Monday I assign myself a random taxon to write a post… Continue reading Fossarinae


Belongs within: Gastropoda.Contains: Palaeostylinae, Diala, Melanopsidae, Procerithiidae, Alabina, Hemisinidae, Pachychilidae, Pickworthiidae, Modulidae, Campaniloidea, Turritellidae, Siliquariidae, Batillariidae, Pleuroceridae, Potamididae, Paludomidae, Thiaridae, Fossarinae, Planaxis, Litiopidae, Diastomatidae, Clava, Clypeomorus, Bittium, Cerithium, Rhinoclavis. The Cerithiimorpha are a large assemblage of aquatic (both marine and freshwater) gastropods, combining the modern Cerithioidea, Campaniloidea and their fossil relatives. They have typically have turriform, often… Continue reading Cerithiimorpha


Belongs within: Cerithiimorpha. The Pleuroceridae are a group of freshwater gastropods with robust shells found in eastern North America. Members of the genus Pleurocera have high-spired shells of several whorls whereas Leptoxis shells are more inflated with only a few whorls. <==Pleuroceridae [Pleuroceratidae, Pleurocerinae] |–Io fluviatilis (Say 1825) [incl. I. brevis Anthony 1860]BC01 |–TriasamnicolaG88 |–Madagasikara… Continue reading Pleuroceridae


Belongs within: Cerithiimorpha. The Campaniloidea are a group of marine gastropods united by sperm morphology, with members having a euspermatozoon containing seven or eight stright mitochondria, accompanied by a dense segmented sheath. They also share a simple larval shell morphology (Ponder et al. 2008). The Campaniloidea are largely relictual in the modern fauna, with Campanilidae… Continue reading Campaniloidea


Belongs within: Cerithiimorpha.Contains: Turritella, Zeacolpus, Tachyrhynchus, Colpospira. The Turritellidae are a group of high-spired marine gastropods. They are generally sessile, feeding by filtering particles from the water column. Members of the subfamily Vermiculariinae become loose or disjointed in later whorls. Vermiculariines are otherwise similar to members of the Turritellinae and have sometimes been included within… Continue reading Turritellidae


Belongs within: Turritellidae. Turritella is a genus of high-spired marine gastropods known from tropical and subtropical waters in the Oligocene to the present of the Indo-West Pacific, and also from the Miocene of the Atlantic (Knight et al. 1960). Fossils have been assigned to the genus as far back as the early Triassic (T. costifera)… Continue reading Turritella


Belongs within: Cerithiimorpha. The Litiopidae are a family of small marine gastropods found in shallow waters on algae and sea-grasses. They are characterised by a high-spired, conical translucent shell, and a long, narrow foot with a median slit in the rear part of the underside, and several epipodial tentacles along the side. The litiopids: small… Continue reading Litiopidae