File:American malacological bulletin (1987) (17970469129).jpg

Title: American malacological bulletin
Identifier: americanmal4519861987amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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304 AMER. MALAC. BULL. 5(2) (1987)
Text Appearing After Image:
Fig. 1. Embletonia pulchra (after photos of living or preserved specimens). A. Dorsal view of a juvenile normal living specimen from Western Sweden, 0.4 mm long, with two pairs of cerata, round oral veil, short cylindrical rhinophores. B. Dorsal view of a juvenile normal specimen from Western Sweden, 0.8 mm long. C. Dorsal view of an adult normal specimen from Western Sweden, 3.0 mm long, with long cylindrical rhinophores, bilobed oral veil and 13 cerata. D-F. Right, ventral and left view of an abnormal 1.75 mm specimen from Marseilles, without rhinophores, without oral veil and only five cerata on the right side, four on the left side of the dorsum. G. Dorsal view of an abnormal 1.5 mm long adult specimen, from Northern Ireland, with only two pairs of cerata and one odd bud of cerata on the tail. H. Dorsal view of a 2 mm long specimen from Sweden, with oral veil of abnormal shape. I. Dorsal view of an abnormal 0.6 mm specimen from Northern Ireland, with slender tail. J. Dorsal view of an abnormal 1.8 mm specimen from Marseilles, with round oral veil and inflated cerata. K. Dorsal view of a small abnormal specimen (1 mm) from Marseilles, with round oral veil and cerata very close to each other. L. Dorsal view of an abnormal 1.6 mm specimen from Marseilles, with abnormal arrangement of cerata. M. Ventral view of an abnormal 1.6 mm specimen from Marseilles, with bifurcate cerata (genital opening visible between the two first right cerata). N. Dorsal view of an abnormal 1.5 mm specimen from Nor- thern Ireland, with round oral veil, low number of cerata and slender tail. O. Dorsal view of a 1.6 mm abnormal specimen from Marseilles with buds of cerata on left rear side of the body. P. Dorsal view of a 1.7 mm specimen from Sweden, with abnormal arrangement of cerata. Q. Dorsal view of an abnormal 1.5 mm specimen from Marseilles, with very long inflated cerata on the right side of the dorsum, buds of cerata on the left side. aberrant shape, reduced size, etc.) (Table 1). Sometimes two and up to three of these abnormalities coexisted on the same individual, resulting in a very aberrant animal that, however, apparently maintained normal activity patterns. Embletonia pulchra (Fig. 1). Based on about 1300 Euro- pean specimens examined, this species appeared most sub- ject to abnormalities. Up to three aberrant features can coexist on the same specimen (Fig. 1K): abnormal round shape of oral veil on adult individual (instead of bilobed), reduced body length and correlatively, cerata very close to each other. Com- paring juvenile (body length < 1.5 mm) and adult individuals (Fig. 1A-C) suggests that a round oral veil and small body size and low number of cerata are juvenile features, while conversely, high number of cerata (up to seven on each side

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