SPERMATOPHORES OF SIX EASTERN NORTH AMERICAN PYRAMIDELLID GASTROPODS AND THEIR SYSTEMATIC SIGNIFICANCE (WITH THE NEW GENUSBOONEA)

Abstract

The intrafamilial systematics of the Pyramidellidae, one of the largest families of marine gastropods and noteworthy phylogenetically in combining prosobranch and opisthobranch traits, has so far been based on shell characters exclusively.1 Woods Hole Oceanographic Institution Contribution No. 4100. SUMMARY 1. Six east North American odostomioid species (Gastropoda: Pyramidellidae) are shown to have spermatophores that are species-specific in structure and position. The spermatophores of Boonca scuiinnda, B. bisutitralis and B. imprcssa are stuck in the mantle cavity; those of Fargoa dianthophila, F. bushiana and F. bartschi are attached to the shell in a constant position. SIGNIFICANCE (WITH THE NEW GENUS BOONEA)." The Biological bulletin 155, 360-382.

3D interactive microanatomy of <i>Omalogyra atomus<i> (Philippi, 1841) (Gastropoda,

“…This assumption is mainly based on the presence of the muscular tube and the absence of a true penis, which Thiele (1931) and Ankel (1936) erroneously thought to be present. However, aphallic hermaphrodites with internal fertilization are also known, for instance, in Architectonicidae (Haszprunar 1985b,c;Bieler 1988), Pyramidellidae (Fretter & Graham 1949;Fretter 1953;Robertson 1978), or Orbitestellidae (Ponder 1990). It is likely that sperm transfer is performed via spermatophores like in the latter taxa (Robertson 1989), although this needs confi rmation.…”

Four new species and two new records of Odostomiinae (Gastropoda: Pyramidellidae) from Brazil

“…Adams, 1839) and Odostomia toyatani Henderson & Bartsch, 1914. Actually, B. seminuda and Odostomia (Chrysallida) toyatani were synonymized by ROBERTSON (1978), but C. nioba must be considered a distinct species since it has a distinct protoconch, with immersed nucleus (Figs 9-11), while in the protoconch of B. seminuda the nucleus is visible; also, the shell shape and sculpture are different, more elongated and without smooth spiral cords above the suture as occurs in B. seminuda.…”

Morphology and Development of Odostomia columbiana Dall and Bartsch (Pyramidellidae): Implications for the Evolution of Gastropod Development

“…However, both embryonic (used here to refer to development prior to hatching) and larval development are much slower than reported for other species (Tables I and II). Although we searched for spermatophores like those described by Robertson (1978), at no time did we And any attached to the shells or bodies of these snails. Egg masses each containing up to several hundred eggs were deposited on Individual eggs are white and range from 71 to 77 /urn in diameter (mean = 74.5; SD = 1.61; n = 23).…”

“…Additionally, the shape and thickness of the chalazae of O. fujitanii figured by Minichev (1971) are clearly different from those in O. columbiana and other pyramidellids. Spermatophores have also been used as a systematic character within pyramidellids to define the genus Boonea (Robertson, 1978). O. columbiana apparently lacks spermatophores; however, this character has been observed in some other species occurring in the northeastern Pacific (A. J. Kohn, pers.…”

“…To date, accounts of pyramidellid reproduction and embryology are brief and limited to a small number of European (Lebour, 1932(Lebour, , 1936Rasmussen, 1944Rasmussen, ,1951Fretter and Graham, 1949), eastern North American (Robertson, 1978;White et al, 1985), and Indo-Pacific (Amio, 1963;Nishinocfa/., 1983;Gumming, 1993) species (Table I). Although more than 50 species have been reported from western North America (Dall and Bartsch, 1909), there exists only a single account of pyramidellid development from the region (LaFollette, 1979).…”