Jerry Harasewych - Academia.edu (original) (raw)
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.
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...
Proceedings of the Biological Society of Washington
Proceedings of the Biological Society of Washington
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.
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...
Proceedings of the Biological Society of Washington
Proceedings of the Biological Society of Washington