Periclocystis Iredale, 1937
publication ID |
https://doi.org/ 10.11646/zootaxa.2462.1.1 |
DOI |
https://doi.org/10.5281/zenodo.5321021 |
persistent identifier |
https://treatment.plazi.org/id/6413F378-FFDC-6A46-F28B-7039FB2AFC81 |
treatment provided by |
Felipe |
scientific name |
Periclocystis Iredale, 1937 |
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Periclocystis Iredale, 1937 View in CoL
Periclocystis Iredale, 1937a: 28 View in CoL . Type species Periclocystis ardeni Iredale, 1937 View in CoL (OD).
Description. External morphology: Shell 4.2–4.3 whorls, not glossy, spire and apex flattened, last whorl rapidly descending. Protoconch sculptured with incised spiral grooves; teleoconch with microscopic spiral grooves. Whorl profile rounded above and below evenly convex periphery. Internal walls of early whorls complete; umbilicus open, narrow U-shape. Mantle laps narrow, finger-shaped, very small, not fused, uniform in colour. Mantle lobes very small. Caudal apparatus as for family; caudal foss vertical slit in tail.
Mantle cavity: As for family. Mantle with no visible minor blood vessels; pigmentation of black and white spots.
Digestive system: Oesophageal crop absent.
Genital system: As for family. Carrefour and talon not examined. Free oviduct very long; capsular gland not examined; internal sculpture not examined. Bursa copulatrix inserted on vagina, moderately short, about half spermoviduct length; duct of bursa copulatrix wide, distinguishable from bursa copulatrix, interior not examined. Epiphallus enters penis through simple pore; penis internally covered in flat, ridged, diamondshaped pustules, pilasters absent, diverticulum on penis absent. Penial sheath thick, enclosing only penis; penis retractor muscle attached to epiphallus. Epiphallus internally with longitudinal pilasters. Epiphallic retractor caecum absent. Very short lime-sac present. Spermatophore not present in dissected material.
Radula: Not examined.
Remarks. Periclocystis , like Echonitor , is restricted to South Australia. This monotypic genus was separated from Echonitor on the basis of a more flattened shell, dull rather than glossy, with a slightly wider umbilicus and a small, thick, non-reflected columella. No description of the anatomy has been previously published.
Periclocystis shares with five other genera ( Echonitor , Tarocystis , Sheaia , Levidens ) the lack of a flagellum and epiphallic caecum but can be distinguished by the flattened, non-glossy shell with a descending last whorl and the distinctive diamond-shaped, ridged pustules covering the inside of the penis.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Periclocystis Iredale, 1937
Hyman, Isabel T. & Ponder, Winston F. 2010 |
Periclocystis
Iredale, T. 1937: 28 |