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Taxon profile

genus

Manzonia Brusina, 1870

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Caenogastropoda »  family Rissoidae

Description

Shell: minute to small, ovate-conic, nonumbilicate, usually with strong, axial ribs (weak to absent on base), crossed by spiral cords or spiral cords predominate; axial ribs rarely absent; a few spiral cords prominent on base. Aperture oval, with or without very weak, broad excavation in rounded posterior corner, rounded anteriorly, with varix on opisthocline outer lip; peristome duplicated. Protoconch multispiral or paucispiral; if multispiral with netted microsculpture, if paucispiral with gemmate or smooth spiral keels; apex usually strongly tilted. Periostracum very thin or calcified.
Head foot: unpigmented, cephalic tentacles long, parallel-sided, foot not markedly constricted in middle as in Rissoa; posterior mucous gland apparently absent. Pallial tentacles present or absent, a metapodial tentacle present or absent.
Operculum: thin, oval, nucleus eccentric, last whorl large.
Development: direct or with planktotrophic larval stage.
Ponder, 1985. A review of the genera of the Rissoidae.

Distribution

Western Europe, Mediterranean, Caribbean, eastern Pacific and Indo-Pacific.

Interchangeable taxa

The species included in Manzonia have a number of features in common and, as far as can be determined, appear to be a natural group that has been distinct from Alvania since at least the Oligocene. Species of Manzonia can be distinguished from most Alvania species by the duplicated peristome and strong, rather smooth basal spirals. The head-foot differs from that of Alvania in having one or no metapodial tentacles, in showing no pigmentation and in apparently lacking a posterior pedal gland. In the features of the head-foot, Manzonia has more in common with Onoba, from which it differs in its Alvania-like sculpture and duplicated peristome.
Ponder, 1985. A review of the genera of the Rissoidae.
Author: Jan Delsing

Subordinated taxa

Number of records: 39

species Manzonia abrupta Dell, 1956
species Manzonia apiculata F. Nordsieck, 1972
species Manzonia aupouria A. W. B. Powell, 1937
species Manzonia aurantiaca R. B. Watson, 1873
species Manzonia boogi Moolenbeek & Faber, 1987

Manzonia boogi

species Manzonia castanea Moolenbeek & Faber, 1987

Manzonia castanea

species Manzonia clarionensis P. Bartsch, 1911
species Manzonia crassa (Kanmacher, 1798)
species Manzonia crispa R. B. Watson, 1873
species Manzonia darwini Moolenbeek & Faber, 1987
species Manzonia exserta H. Suter, 1908
species Manzonia gallegosi F. Baker, G. D. Hanna & A. M. Strong, 1930
species Manzonia gallinacea Finlay, 1930
species Manzonia gibbera R. B. Watson, 1873
species Manzonia gradatoides Finlay, 1930
species Manzonia granti Strong, 1938
species Manzonia ingrami J. G. Hertlein & A. M. Strong, 1951
species Manzonia isolata C. F. Laseron, 1956
species Manzonia janmayeni Friele, 1878
species Manzonia lamellata Ph. Dautzenberg, 1889
species Manzonia lucasana F. Baker, G. D. Hanna & A. M. Strong, 1930
species Manzonia maclurgi A. W. B. Powell, 1933
species Manzonia madeirensis Moolenbeek & Faber, 1987
species Manzonia milleriana J. G. Hertlein & A. M. Strong, 1951
species Manzonia moniziana R. B. Watson, 1873
species Manzonia mutans P. P. Carpenter, 1857
species Manzonia myriosirissa Shasky, 1970
species Manzonia overdiepi J. J. van Aartsen, 1983

Manzonia overdiepi

species Manzonia pelorum Moolenbeek & Faber, 1987

Manzonia pelorum

species Manzonia pingue Webster, 1906
species Manzonia pinguoides A. W. B. Powell, 1940
species Manzonia sculptilis T. A. di Monterosato, 1877
species Manzonia solitaria Dell, 1956
species Manzonia subareolata T. A. di Monterosato, 1879
species Manzonia talaverai Moolenbeek & Faber, 1987
species Manzonia unifasciata Ph. Dautzenberg, 1889
species Manzonia veleronis J. G. Hertlein & A. M. Strong, 1939
species Manzonia watsoni R. B. Watson, 1873
species Manzonia wilmae Moolenbeek & Faber, 1987

Manzonia wilmae


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