Papers by Jerry Harasewych
Mitra cornea Lamarck, 1811, a member of the taxonomically complex group of small brown miters, is... more Mitra cornea Lamarck, 1811, a member of the taxonomically complex group of small brown miters, is described anatomically, including observations on shell ultrastructure and diet. Morphological features confirm its taxonomic placement within the genus Mitra, and indicate a closer relationship with the western African Mitra nigra than with the Mediterranean Mitra cornicula. Mitra cornea shares the morphological adaptations of the anterior alimentary system that have evolved in conjunction with a specialized sipunculan diet, and that appear to be fairly uniform within the Mitrinae. Studies on the composition and pharmacological effects of the secretions of the salivary glands and hypobranchial gland are needed to better interpret the origin and evolutionary pathways that gave rise to the extreme trophic specialization of the Mitridae. RESUMO Descreve-se anatomicamente Mitra cornea Lamarck, 1811, um membro do grupo taxonomicamente complexo de pequenas mitras castanhas, incluindo-se observacoes sobre a estrutura da concha e sobre a dieta. As caracteristicas morfologicas confirmam a sua localizacao taxonomica no genero Mitra e indicam um relacionamento mais chegado com Mitra nigra, da Africa ocidental, do que com a mediterrânea Mitra cornicula. Mitra cornea possui as adaptacoes morfologicas da porcao anterior do sistema alimentar que evoluiram juntamente com uma dieta especializada de sipunculos, e que parece ser bastante uniforme dentro dos Mitrinae. Sao necessarios estudos sobre a composicao e efeitos farmacologicos das secrecoes das glândulas salivares e da glândula hipobranquial para melhor se interpretar a origem e os percursos evolutivos que fizeram aparecer a especializacao trofica extrema dos Mitridae.
new genus, new species; Afff^zn/wcr/HMMi cof/icdnf/f new genus, new spi-cies; and (x/ifionro n/rW... more new genus, new species; Afff^zn/wcr/HMMi cof/icdnf/f new genus, new spi-cies; and (x/ifionro n/rWw new genus, new species, are described from the Scotia tectonic plate and adjacent alwssal plains.
\A\e southern oyster drills, Stranionita haemastoma floridana (Conrad, 1837), have been collected... more \A\e southern oyster drills, Stranionita haemastoma floridana (Conrad, 1837), have been collected from two Chesapeake Bay western shore tributaries. Four specimens were collected between Brown Shoal and Thomas Rock in the lower James River in February 2005. Thirteen live southern oyster drills were collected from Back Biver in April 2006. Identification of these drills as Stramonita haemastoma floridana has been confirmed using DNA bar-coding data. Southern oyster drills collected in Chesapeake Bay are genetically nearly identical to populations from the Atlantic coast, and differ significantly from populations from the Azores and from the Gulf of Mexico. These collections mark the first reported records of live southern oyster drills from within the Chesapeake Bay estuar)'. It is unknown if these drills represent isolated introductions or expansions of the northern range this species. Water temperature patterns in Chesapeake Bay and the Mid-Atlantic Bight from 1990-2005 are similar to those obser\'ed in the late 1950s when Stramonita haemastoma floridana was first found living in Chincoteague Bay, Maryland.
A new muricid, Pterynotus xenos, is described from 60 meters off Discovery Bay, Jamaica. The habi... more A new muricid, Pterynotus xenos, is described from 60 meters off Discovery Bay, Jamaica. The habitat of this new species is discussed, as are its relationships with closely related Recent and fossil species.
ABSTRACT The occurrence of the subfamily Columbariinae in the eastern Indian Ocean is documented ... more ABSTRACT The occurrence of the subfamily Columbariinae in the eastern Indian Ocean is documented for the first time. Of the 5 species recognized, one, Coluzea distephanotis, new combination, has been previously described from the Torres Strait. Additional material suggests that this type locality is erroneous. Four new species, Coluzea aapta, C. icarus, C. liriope and C. gomphos are described. The eastern Indian Ocean species appear to be more closely related to their congeners from off southern and eastern Africa than to those from off New Zealand, suggesting post-Eocene vicariance of at least some elements of the psychrospheric faunas of the Indian and Pacific Oceans.
Olssonella smithii (Dall, 1888) is a small cancellariid gastropod that inhabits sand svèstrates o... more Olssonella smithii (Dall, 1888) is a small cancellariid gastropod that inhabits sand svèstrates off the southeastern United States, the Gulf of Mexico, Colombia and Venezu£la. It resembles Cancellaria reticulata (Linné, 1767) in anatomical organization, but differs in having a less specialized anterior alimentary system and an unmodified left cephalic tentacle. Shell ultrastructure is similar in these two species, although 0. smithii has a thicker periostracum. Olssonella smithii also lacks bifurcated columellar folds and has internal varices that differ in periodicity from those ofC. reticulata. Based on the morphology ofradulae and jaws we suggest that the subfamilies Cancellariinae and Trigonostominae are more closely related to each other than either is to Admetinae, in which there is a trend toward loss of the radula. The Cancellariacea comprise a highly specialized, poorly known and taxonomically enigmatic group of marine gastropods. Although they form a morphologically compac...
The Nautilus, 2004
Four new species of Columbariinae are described from the Indian Ocean, based on museum material. ... more Four new species of Columbariinae are described from the Indian Ocean, based on museum material. Coluzea kallistropha inhabits the lower continental slope off Mozambique and the KwaZulu-Natal coast of South Africa, and may easily be distinguished from its congeners by its lower spire and broad, flangelike peripheral keel. Coluzea madagascarensis occurs on the upper continental slope along the southwestern coast of Madagascar. Diagnostic features include long, radial spines along the shell periphery and strong spiral sculpture. Columbarium quadrativaricosum is presently known only from the upper continental slope off Transkei, South Africa. Its distinctive, thick, squarish varices serve to distinguish it from closely related species. Coluzea naxa is known only from its type locality along the uppermost continental slope off the Northwest Shelf of Western Australia. It is readily discerned from its geographically proximal congeners on the basis of its smaller, thinner, shell, prominen...
Leptomaria antipodensis and Leptomaria hickmanae are described from the Upper Cretaceous [Maastri... more Leptomaria antipodensis and Leptomaria hickmanae are described from the Upper Cretaceous [Maastrichtian] Lopez de Bertodano Formation, Seymour Island, and represent the first Mesozoic records of the family Pleurotomariidae from Antarctica. Leptomaria stillwelli, L. seymourensis, Conotomaria sobralensis and C. bayeri, from the Paleocene [Danian], Sobral Formation, Seymour Island, are described as new. Leptomaria larseniana (Wilckens, 1911) new combination, also from the Sobral Formation, is redescribed based on betterpreserved material. The limited diversity of the pleurotomariid fauna of Seymour Island is more similar to that of the Late Cretaceous faunas of Australia and New Zealand in terms of the number of genera and species, than to the older, more diverse faunas of South America, southern India, or northwestern Madagascar, supporting the status of the Weddelian Province as a distinct biogeographic unit. The increase in the species richness of this fauna during the Danian may be due to the final fragmentation of Gondwana during this period.
The Columbariinae have been represented in the fauna of New Zealand from the Paleocene until the ... more The Columbariinae have been represented in the fauna of New Zealand from the Paleocene until the Recent, providing the longest known continuous record for the subfamily. Seven living species, representing the genera Columbarium, Coluzea, and Fulgurofusus, are recognized, and include two species, Fulgurofusus maxwelli and Fulgurofusus marshalli that are described as new. The New Zealand columbariine fauna is unusually diverse at the generic level, and includes the largest members of the subfamily, as well as the only primarily sublittoral species. The morphology, anatomy, and distribution of the living species are discussed, as are their relationships to living and fossil congeners.
Proceedings of the Biological Society of Washington
Cancellaria (Cancellaria) coltrorum, new species, is described from shallow waters of the souther... more Cancellaria (Cancellaria) coltrorum, new species, is described from shallow waters of the southern Brazilian Province, ranging from the Abrolhos Archipelago to Vitória. This new species co-occurs with C. petuchi Harasewych, Petit & Verhecken, 1992 but may be distinguished from it by having a broader shell with a shorter, wider spire; a proportionally larger aperture that is widest along its adapical half and has fewer, weaker lirae on the outer lip; and, most conspicuously, by having reticulate sculpture that becomes more irregular and dominated by axial ribs in latter whorls, and by being white or faintly mottled in very light tan rather than having dark brown spiral bands. The broad-ranging Cancellaria reticulata (Linnaeus, 1767) differs from both C. petuchi and C. coltrorum in having a shell with finer and more regular spiral and axial sculpture that is equal in prominence and produces a regular, reticulated pattern, as well as in having a thick, bifid posteriormost columellar fold and in lacking a thick callus that obscures the sculpture along the parietal region. Similarities in shell morphology suggest that C. mixta Landau, Petit & Silva, 2012, from the late Miocene of Panama, was a progenitor of C. coltrorum and C. petuchi, as well as the Panamic C.
A new deep-sea species of Volutidae in the genus Tractolira is named from material collected by t... more A new deep-sea species of Volutidae in the genus Tractolira is named from material collected by the United States Antarctic Program in and around the Ross Sea, eastern Antarctica, and from one locality in the Subantarctic region. Tractolira delli new species is most similar to T. sparta Dall, 1896, from which it differs in having a relatively wider shell, less prominent spiral sculpture, with narrower threads, and by the absence of strong axial ribs at least on the first three teleoconch whorls. The other Antarctic congener, Tractolira germonae, has a thicker, dark-brown periostracum (instead of a thin, light-yellow one), a proportionally smaller inductura, and lacks surface sculpture.
Proceedings of the Biological Society of Washington
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Papers by Jerry Harasewych