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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 RrSTORY 2J: T

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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

^

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

.1

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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