Inland mollusks from Venezuela, southern Brazil, and Peru

LIBRARY OF THE

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V.39
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NATURAL HISTORY.
SURVEY

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FIELDIANA: ZOOLOGY

A continuation of the

ZOOLOGICAL SERIES

of

FIELD MUSEUM OF NATURAL HISTORY

VOLUME 39

NATURAL HiSTORV PURVEY

FEB 11 1971

IIRRARY

FIELD MUSEUM OF NATURAL HISTORY
CHICAGO, U.S.A.

, FIELDIANA • ZOOLOGY

3 Published by

CHICAGO NATURAL HISTORY MUSEUM

Volume 39 ' May 22, 1959 No. 31

INLAND MOLLUSKS FROM VENEZUELA,
SOUTHERN BRAZIL, AND PERU

Fritz Haas
Curator Emeritus, Division of Lower Invertebrates

This paper consists of a study of various South American collec-
tions, together with observations and remarks on little-known species
from that area. Two new species are described.

All drawings were made by John Pfiffner, Staff Artist.

Dryptus lasalleanus, new species

Type. — In Museum of the Sociedad de Ciencias Naturales La Salle,
Department of Zoology, section of mollusks; Caracas, Venezuela.
Collected in Mucurubd, State of M^rida, Venezuela.

Diagnosis. — A rather small species of Dryptus, characterized by
the almost unicolored conchinic layer; by the purplish color of the
earlier whorls, which are furthermore rib-striate; by distant heavy
folds with very fine wrinkle-striation ; and by the microscopical, inter-
rupted spiral lines of the ultimate whorl.

Description of type. — Shell elongated-ovate, imperforate, rather
heavy. Whorls 5^, somewhat convex, of regular growth, separated
by a distinct suture bordered below by a narrow whitish zone. The
last whorl descends more obliquely, very shortly ascending at the
aperture. The earlier whorls have a purplish tint which changes into
a blackish brown at the beginning of the penultimate whorl. The first
two whorls are finely and densely zigzag- wrinkled, a feature also pres-
ent on the third whorl, which, in addition, develops subvertical striae
which become gradually rib-like, making the suture appear almost
crenulate. On the fourth whorl these rib-striae, though somewhat
fainter, stand out by their darker color, whereas on the last whorl
they show only as projecting, darker-colored growth marks. There
is a marking of very faint, submicroscopical vertical wrinkles between

Library of Congress Catalog Card Number: 59-1 2 ^7 6

No. 875 363

•'' RATURAL
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364 FIELDIANA: ZOOLOGY, VOLUME 39

the growth Hnes. A very fine, indistinct and interrupted spiral stria-
tion crosses these vertical wrinkle-lines (fig. 60) . Aperture decidedly
higher than the spire, ovate, pointed above, bluish inside, with a
thickened, slightly reflexed lip of buff color; columella very slightly
folded, parietal callus thin, bluish.

Measurements of type. — Height 48.4 mm., width 24.5 mm., height
of aperture 28.0 mm., width of aperture 14.8 mm. (fig. 60).

Fig. 60. Dryptus lasalleanus, new sp., type. Left, X 1; right, surface of last
whorl, X 3.

Notes on paratypes. — There are a number of paratypes from the
same locality as the type in the collection of the Sociedad de Cien-
cias Naturales La Salle, and seven, with the same data, in the col-
lection of Chicago Natural History Museum (no. 52445).

Remarks. — There is little variability in this species as far as the
surface sculpture and coloration are concerned. However, with re-
spect to the measurements of the shells, the following maximum-
minimum values were found: Largest specimen, 52.2 mm.; smallest
specimen, 43.0 mm.; most obese specimen, 27.5 mm.

Inland Mollusks from Southern Brazil

In the course of recent years, Chicago Natural History Museum
has received from an entomologist, Mr. Fritz Plaumann, of Nova
Teutonia, Santa Catarina, Brazil, repeated shipments of shell mate-
rial. The species included are in most cases small forms, such as an

HAAS: INLAND MOLLUSKS 365

entomologist may pick up with insects, either by sweeping grass or

bushes or from leaf mould. The aquatic specimens are also small forms.

The following lists show the material collected at various localities :

NOVA TEUTONIA, SANTA CATARINA, BRAZIL, 27° 11' S. LAT., 52" 23'

W. LONG.

Radiodiscus (Radioconus) clarus Thiele

Radiodiscus (Radiodisctis) janeirensis Thiele

Radiodiscus (Radiodiscus) jheringi Thiele

Radiodiscus (Radiodiscus) gordurasensis Thiele

Radiodiscus (Radioconus) goldii Thiele

Radiodiscus (Radioconus) costellifer H. Scott (new record; see p. 366)

Happia (Happia) miradiscus Thiele

Miradiscops (Microhappia) brasiliensis Thiele

Leptinaria (Leptinaria) monodon C. B. Adams (two specimens; first record from

outside Puerto Rico)
Drymaeus (Drymaetts) poecilua icterinus Ancey (first record from Santa Catarina)
Macrodontes (Macrodontes) odontostomus Sowerby
Odontostomus (Bahiensis) tudiculatus Martens
Bulimulus (Protoglyptus) eudioptu^ Ihering (see note, p. 367)
Strophocheilv^ (Megabulimus) oblongus oblongus Mueller
Vertigo (Vertigo) ovata Say (first record from mainland of South America)
Zonitoides (Zonitoides) nitidus Mueller
Habroconus (Pseudoguppya) semen-lini Moricand
Chilina fluminea microdon Sowerby
Aplexa (Stenophysa) rivalis Maton and Rackett
Australorbis camerunensis C. Boettger (see note, p. 366)
Acrorbis petricola Odhner
Burnupia (Uncancyliis) barilensis Moricand
Potamolithus lapidum Orbigny
Littoridina charruana Orbigny
Adelopoma paraguayanum Parodiz
Helicina (Oxyrhombus) densestriata A. J. Wagner
Alcadia (Alcadia) iheringi A. J. Wagner
Pisidium globulus Clessin

TATI5 CREEK, SANTA CATARINA, BRAZIL
Littoridina charruana Orbigny

ENGANO RIVER, SANTA CATARINA, BRAZIL

Littoridina charruana Orbigny

CHAPECOZINHO RIVER, SANTA CATARINA, BRAZIL
Littoridina charruana Orbigny

XANXERE, SANTA CATARINA, BRAZIL
Happia (Happia) insularis 0. Boettger

PINHAL-PRETO, SANTA CATARINA, BRAZIL

Radiodiscus (Radioconus) clartis Thiele
Radiodiscus (Radiodiscus) gordurasensis Thiele
Habroconus (Pseudoguppya) semen-lini Moricand
Adelopoma paraguayanum Parodiz

366 FIELDIANA: ZOOLOGY, VOLUME 39

LINHA FACAO, SANTA CATARINA, BRAZIL
Pseudosuccinea peregrina Clessin
Littoridina charruana Orbigny
Potamolithus catharinae Pilsbry
Potamolithus philippianus Pilsbry

SAO CARLOS, SANTA CATARINA, BRAZIL

Radiodiscus (Radioconus) clarus Thiele
Radiodiscus (Radiodiscus) jheringi Thiele
Radiodiscus (Radiodiscus) gordurasensis Thiele
Happia (Happia) insularis O. Boettger

RIO DOURADINHO, RIO GRANDE DO SUL, BRAZIL
Potamolitus lapidum Orbigny

ERECHIM, RIO GRANDE DO SUL, BRAZIL
Australorbis camerunensis C. Boettger

RIO ARATIBA, RIO GRANDE DO SUL, BRAZIL

Aplexa (Stenophysa) rivalis Maton and Rackett
Pseudosuccinea peregrina Clessin
Burnupia (Uncancylus) barilensis Moricand

Radiodiscus (Radioconus) costellifer H. Scott. Figure 61.

I was very much surprised to recognize this species, described only
two years ago from Villarica, Paraguay, in the material collected by
Mr. Plaumann at Nova Teutonia. I have four specimens at hand,
slightly smaller than Mrs. Hylton Scott's type; the largest is about
1.5 mm. in diameter. Other small differences are that the number
of leaf-like ribs is somewhat smaller in the Brazilian specimens than
in those from Paraguay, and in my specimens the aperture is not
quite as high as in the authoress' specimens. However, these dis-
crepancies are not important enough to consider the Brazilian speci-
mens as a different species.

Australorbis camerunensis C. Boettger

Durval T. de Lucena (Rev. Bot. Zool. Afr., 48: 17&-178, 1953)
has mentioned the occurrence of this West African species in Brazil;
it had been found in various localities near Santos, Sao Paulo. In his
study on the Brazilian planorbids in 1956 (Resenha Sistematica
do Planorbideos Brasileiros, 104 pp., 9 pis.), the same author lists
this species from some more localities near Santos and, further-
more, from Quinta da Boa Vista in the Federal District of Brazil.
In the material received from Mr. Plaumann and listed above, Aus-
tralorbis camerunensis was represented from Nova Teutonia, Santa

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HAAS: INLAND MOLLUSKS

367

Fig. 61. Radiodiscus (Radioconus) costellifer H. Scott. Views from above,
below, and side; about X 40. Section of upper surface; about X 80.

Catarina, and from Erechim, Rio Grande do Sul, proving thus its
farther distribution to the south of Brazil.

Bulimulus (Protoglyptus) eudioptus Ihering

Pilsbry pubHshed in 1897 (Man. Conch., 2nd ser., 11: 89, pi. 14,
figs. 16, 17) under the authorship of H. von Ihering, a species of
Bulimulus which he named eudioptus. The description was appar-
ently based upon a single specimen, which, as we know now, was not
even fully grown. For this reason, both the verbal description and
the figures are not satisfactory; indeed, the species is not recognizable.
The magnified drawing of the sculpture of the nepionic whorls is
especially misleading.

Among the material received at various occasions from Nova Teu-
tonia, Santa Catarina, from Mr. Plaumann, there were some specimens
of a Protoglyptiis which appeared new to me, since its apical sculpture
did not fit any species described. Before I described this supposed
novelty, my younger colleague Dr. Alan Solem had occasion to exam-
ine the bulimulids in the collection of the Academy of Natural Sciences

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368 FIELDIANA: ZOOLOGY, VOLUME 39

in Philadelphia. He discovered there a species which seemed iden-
tical with my own material of the supposed new species, and he called
my attention to this fact. I am convinced that Plaumann's speci-
mens are indeed the species eudioptus von Ihering, and they are listed
under this name. It seemed worth while to me to provide a new de-
scription and new figures of this badly described and figured species
and to offer additional information based upon my richer material of
full-grown specimens.

Description. — Shell narrowly umbilicate, small, ovate-conic, thin
and translucent; horn-brown, and sometimes on the last whorl irreg-
ular whitish blotches which, when present, extend from suture to
base. Surface rather dull, finely striated with narrow striae. Spire
higher than the aperture, slightly obese, perceptibly tapering toward
the apex which is slightly pointed and which offers a Protoglyptus-
sculpture (fig. 63). Whorls Q^o, the upper ones slightly, the last two
ones definitely convex; the last swollen near the suture, subcom-
pressed below. Umbilical chink narrow.

Aperture small, ovate, moderately oblique, with the outside color
shining through; peristome thin, not expanded, the columellar margin
dilated over the umbilical chink, the columella slightly arched.

There is a noticeable range of variation in the general shape of the
shell. The shell measurements of the slender specimens (fig. 62, left)
contrast greatly with those of a representative of the obese group
(fig. 62, right). The extremes just mentioned are, however, con-
nected by intermediate stages which seem to prove that the speci-
mens are specifically identical. The other features mentioned in my
description are found in all specimens of the species; only the whitish
blotches on the last whorl may be reduced in size and extent or may
be lacking.

Measurements. — Height 13.4, 14.3 mm., width 7.8, 7.2 mm., height
of aperture 7.11, 6.9 mm., width of aperture 4.5, 3.8 mm. (fig. 62).

Epiphragmophora (Epiphragmophora) connectens, new species
Type. — Chicago Natural History Museum no. 51919, from Cam-

bache near Chongoyape, Lambayeque, Peru; collected on March 19,

1954, by Celestino Kalinowski.

Diagnosis. — A species of Epiphragmophora proper, characterized

by bluntly angular periphery and a very wide umbilicus.

Comparisons. — This species resembles Karlschmidtia lentiformis

Haas in being rather flat and indistinctly keeled; however, it is

Fig. 62. Bulimulus (Protoglyptus) eudioptus Ihering; about X 3.

Fig. 63. Bulimultis (Protoglyptus) eudioptus Ihering, nepionic whorls; X 75.

369

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370

FIELDIANA: ZOOLOGY, VOLUME 39

Fig. 64. Epiphragmophora {Epi-
phragmophora) connectens, new sp.,
type. Views from above, below, and
side; about X 2.

always smaller, its umbilicus is wider and it lacks entirely the costu-
lation so obvious in K. lentiformis. Its closest ally among its congeners
is Epiphragmophora olssoni Pilsbry, which, however, is higher and less
widely umbilicate.

Description of type. — Shell thin, depressed, somewhat lens-shaped,
indistinctly carinate, very openly umbilicate, the umbilicus contained
about three times in the diameter of the shell. Whorls 43/^, growing
regularly, little obese, the last not descending in front. Color yellow-
ish brown, with one supra-peripheral chestnut-brown band with
lighter borders. The surface of the first 13^ whorls is smooth, the
rest finely striate with weak malleations. The aperture is oblique
and shortly elliptical, the upper margin almost straight, the lower
slightly curved. The peristome is white, rather wide, evenly reflected
throughout.

Measurements of type. — Greater diameter 26.9 mm., smaller diam-
eter 21.9 mm., height 11.2 mm., width of aperture 11.2 mm., height
of aperture 8.7 mm,

Paratypes. — There are two paratypes (no. 70886) from the same
locality as the type, one adult and one young. The adult resembles
the type exactly, but is slightly higher and its peristome is bordered
on the inside by a pale grayish-rose zone. Its measurements are:

HAAS: INLAND MOLLUSKS 371

greater diameter 25.8 mm., smaller diameter 21.5 mm., height 12 mm.,
width of aperture 12.6 mm., height of aperture 8.8 mm.

The younger paratype of only 33^ whorls is sharply keeled below
the band.

Three more paratypes, two adult ones and an immature one, from
Mount Campana near Trujillo, Peru, 1,000-1,500 meters alt., col-
lected by Dr. W. Weyrauch, are Museum of Comparative Zoology
no. 109638, and Chicago Natural History Museum no. 70887; they are
bleached and do not show the band ; they are typical in every respect.

The dimensions of the two adult specimens are: greater diameter
24.9, 24.0 mm., smaller diameter 20.4, 20.2 mm.

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