Review of the classification of the Cyrenacea

Vol. _XVI, pp. 5-8

February

21, 1903

PROCEEDINGS

or THE

BIOLOGICAL SOCIETY OF WASHINGTON

REVIEW OF THE CLASSIFICATION OF THE CYRENACEA.

BY WILLIAM

^H.

DALL.

In working ^over

^the

Cyrenacea

^{for the}

Memoir on

the

Ter-

tiaryFossils of Florida, ⁱⁿ

course

of publication

by

^the

Wagner

Institute of Science, ^it

was found

that

both

the

nomenclature and

the classification

were

^{in a} state of

deplorable

^confusion.

While

the details arereserved for that

memoir,

^it

was _thought

that a

synopsis

^{of the}

arrangement adopted might ^be

^{of use to} the students of the

group, and

^{it is}hei-ewith presented.

Family

Cyrenidoe.

Genus

Miodontoptis Dall(nov.).

Type

Cyrena media Sowerby. ^Juras-

sic. ThisisMiodon Sandberger, 1870, not Carpenter, ^1865.

Genus

Loxoptychodon Sandberger, ^1872.

Type

Cyrena ^intermedia De- shayes.

Lower

Eocene, ^France.

Genus

Plesiastarte Fisher, 1887.

Type

^{P. crenulata} Deshayes ^(as Cyrena).

Lower

_Eocene, France.

This is

Anomala

_Cossmann, 1886, not Hiibner, ^1816.

Genus

Ditypodon Sandberger, ^1872.

Type

Cyrena ^suessiiC. Mayer.

Lower

Pliocene_{of Italy.}

?Genus_Donacopsis Sandberger, ^1872.

Type

CyrenaacutangularisDe-

3—

Phoc. Biol. Soc. Wash. vol. XVI, ^iy03. (6)

6

Dall — Revision of Cyrenacea.

shayes. Eoceneof France. I suspect ^{this to} be merelya subdivision of Cyrena.

Genus

_Cyrena

Lamarck,

^1818.

Type

Cyrena bcngalensis

Lamarck.

Recent. India.

Section Polymesoda Rafinesque, ^1820.

Type

Cyclas caroliniana Bosc.

Recent. South Carolina. Cyprinellaand Diodus Gabb, andLeptosiphon Fischeraresynonymous.

Section Pseudocyrena Bourguignat, ^1854.

Type

Cyrena maritima D'Orbigny. Cuba.

Anomala

_Deshayes, not Hiibner, Egeta H.

and

A.

Adams,

and Cyrenocapsa^{Fisher are}synonymous.

Section Oeloina Gray, ^1844.

Type

Cyrena ^coaxans

Gmelin

_(C.zeylan-

icaLamarck). ^Recent. Ceylon.

Section Egetaria Morch, 1861.

Type

E. pullastraMorch.

West

coast CentralAmerica.

Section Isodoma Deshayes, ^1858.

Type

^/. cyprinoides Deshayes.

Eoceneof France.

Subgenus

Leptesthes Meek, 1872.

Type

^Corbicula fracta Meek.

Eocene

of

Nebraska

Genus

Corbicula Megerle, ^1811.

Type

^Tellina fivminalis Muller.

India.

Section Veloritina Meek, 1871.

Type

Corbicula durkeei Meek. Cre- taceous of

Wyoming.

Section Corbiculina Dall(nov.).

Type

Corbicula angasi Prime. Aus-

tralia. Smaller and

more

delicatethan Corbiculas. s.

and

viviparous.

Section Tellinocyclas Dall _(nov.).

Type

Cyrena ^tellinella Deshayes Parisian Eocene. Small, heavy, elongateand acute, withshort distant lateral teeth.

Section Cyrenodonax^Dall (nov.).

Type

^C.formosana ^{Dall. Recent.}

Formosa. Like Donacopsis but inflated, without radial sulcation and having anentire pallial^line.

Subgenus

Cyanocyclas Ferussac, 1818 (restricted).

Type

^Corbicula limosa Maton. South America.

Genus

Villorita Gray, ^1833.

Type

^V. cyprinoides

Wood.

IndoChina

and

_Japan.

The name was

_spelled Veloritaby

Gray

^in1842.

Genus

Batissa Gray, ^1853.

Type

^{B. tenebrosa Hinds. Australia.}

Genus

Egeria Roissy, ^1805.

Type

Venus paradoxa^{.Born. Rivers of}

West

Africa. Oalatea Bruguiere, Trigona

Schumacher

not Jurine, Potamophila Sowerby, ^Oalateola Fleming,

and Megadenma Bowdich

^are synonymous.

Section Egeria^s.s.

Type

^E.paradoxa ^Born.

Section Profischeria Dall (nov.).

Type

^{Fischeria Delesserti Bernardi.}

West

Africa. ThisisFischeria Bernardi, 18G0, not

Robineau

_Desvoidy,

1830.

Dall — Revision of Cyrenacea.

Family

Sphteriidje.

Genus Sphmrium

Scopoli, 1777.

Type

^Tellina cornea Linne\

North

Europe. Cyclas

Lamarck

not Link, Cornea _Megerle,

Amesoda

Rafin- esque, Cycladites Kriiger,

Pisum

Bourguignat not Megerle,and Corneola Clessin, not Held, aresynonymous.

Subgenus Sphavium

^{s. s.}

Type

^{S. corneumLinne\}

Section Cyrenastrum Bourguignat, ^1854.

Type

^{8. solidum.}

Normand.

France.

Section Sphceriastrum Bourguignat, ^1854.

Type

^{S. rwicola Leach.}

England.

Subgenus

^Musculium Link, ^1807.

Type

^{Tellina lacustris Muller.}

Denmark.

Calyculina Clessin^issynonymous.

Subgenus Eupera

Bourguignat, ^1854.

Type

^Pisidium moquiyiiamim Bourg. ^Brazil. LimosinaClessin^issynonymous.

Genus

Corneocyclas Ferussac, 1818, (restricted).

Type

^Tellinaptmlla Gmelin.

Germany.

Subgenus

Corneocyclas.

Section Corneocylas^{s. s.}

Type

^C.pusillaGmelin.

Section

Phymesoda

Rafinesque, ^1820.

Type

Tellina virginica Gmelin.

Virginia.

Section Pisidium C. Pfeiffer, 1821.

Type

^{Tellina amnica Muller.}

Denmark.

Section Cyclocalyx Dall (nov.).

Type

^{PisidiumscholtziiClessin. Ger-}

many. The umbones

_high

and

constricted below the nepionic ^shell, otherwiselike Corneocyclas^{s. s.}

Subgenus

Cymatocyclas Dall (nov.).

Type

Pisidium compressum Prime.

Cambridge, ^Mass. Nepionic^valvesflat, transversely undulated, sharply

marked

offfromthe rest ofthedisk, otherwiseas in Corneocyclas.

Subgenus

Tropidocyclas Dall _(nov.).

Type

Pisidium henslowianum Sheppard. England. Nepionic^valveswithanoblique, elevated,^radial keel anddistinctlydelimited fromtherestof thedisk. FossarinaCles- sin, 1873,not

Adams,

1863,^issynonymous.

Notes.

Pera

Leach and

Euglesa Leach, ^{1852, are}

synonymous

^{with Corneo-}

cyclas^{s. s.} Galileja Costa; Euglesia Leach, 1840;

Pisum

_Gray, 1847,not Megerle, ^1811; Cordula Leach; Fluminina Clessin; Cycladina ^Clessin;

and

Rivulina Clessin; arenot separable from Pisidiums.s., if judged by their types; mostof

them

are based on perfectly worthless characters.

The

specificdeterminations^ofWesterlundin the'Faunader Palsearcti-

8

Doll — Revision of

Cyrenacea.

schen Region' have been accepted ⁱⁿdetermining^the

synonymy

^{of the}

types.

It

may

^beof interest to state here that the group Cyclas, a

name

_ap-

pliedbyBruguiere, in 1798, to aheterogeneousassembly, and afterward used

by Lamarck

for species of the _prior genus Sphcerium,

was

first properly divided by

Link

in 1807,

who

_segregated

Musculium and

took the_largest

and

first species of Bruguiere^asa type ^for thegenus Cyclas.

This

was

the Venus islandica of Linne, ^to which, subsequently, the

names

ofCyprina

Lamarck,

1S12; Arctiea

Schumacher,

1817, not

Moeh-

ring, 1758;

and

Cypriniadea Rovereto, 1900, were _applied.

These

be-

come synonyms

^of Cyclas (Bruguiere) Link, whoseonly speciesand _type

is VenusislandicaL.