Interstitial nemerteans of the genus Ototyphlonemertes are difficult to organize into traditional... more Interstitial nemerteans of the genus Ototyphlonemertes are difficult to organize into traditional morphospecies. They occur in a multitude of slightly different local varieties that form a seemingly continuous morphological cline. In this paper, we summarize most published morphological data on the group, plus 73 new records of geographic varieties from the Mediterranean Sea in the East to the Sea of
Notogaeanemertes folzae Riser, 1988, is asupralittoral hoplonemertean from New Zealand alliedto t... more Notogaeanemertes folzae Riser, 1988, is asupralittoral hoplonemertean from New Zealand alliedto the ’group 1‘ terrestrial and semiterrestrialgenera. The original description noted that it, likea few other ‘group 1’ forms, is hermaphroditic andthat it is viviparous. The present study found that,in addition to testes and ovaries, mature individualscontain mixed gonads, most with testis tissuepredominating and some oocytes in various stages ofdevelopment,
Specimens of the common intertidal nemerteans Lineus ruber and L. viridis were collected fromsite... more Specimens of the common intertidal nemerteans Lineus ruber and L. viridis were collected fromsites along the west and Southwest coasts of Britain,northern France and North America. Allele frequenciesof up to 13 putative enzyme loci were estimated forall populations of L. ruber and L.viridis. Estimates of genetic variation were low forpopulations of L. ruber (Hobs 0.008–0.052)but were higher for populations of
A glandular cushion, called the pedal aperture gland in this paper, lies adjacent and internal to... more A glandular cushion, called the pedal aperture gland in this paper, lies adjacent and internal to each of the two mantle margins composing the pedal aperture of the soft-shelled clam Mya arenaria. Two types of glandular cells are found in the glands. The principal type (bacillary mucous cell) manufactures secretory vesicles that contain discrete protein-rich fibers in a matrix of glycoprotein. The second type (mucous goblet cell) produces sulfated and nonsulfated mucosubstances. The glands function in the formation of pseudofeces from particulate material, especially burrow sediments that enter the mantle cavity through the pedal aperture. Their possible phylogenetic relationship to similar glands in other bivalves is discussed briefly.
Interstitial nemerteans of the genus Ototyphlonemertes are difficult to organize into traditional... more Interstitial nemerteans of the genus Ototyphlonemertes are difficult to organize into traditional morphospecies. They occur in a multitude of slightly different local varieties that form a seemingly continuous morphological cline. In this paper, we summarize most published morphological data on the group, plus 73 new records of geographic varieties from the Mediterranean Sea in the East to the Sea of
Notogaeanemertes folzae Riser, 1988, is asupralittoral hoplonemertean from New Zealand alliedto t... more Notogaeanemertes folzae Riser, 1988, is asupralittoral hoplonemertean from New Zealand alliedto the ’group 1‘ terrestrial and semiterrestrialgenera. The original description noted that it, likea few other ‘group 1’ forms, is hermaphroditic andthat it is viviparous. The present study found that,in addition to testes and ovaries, mature individualscontain mixed gonads, most with testis tissuepredominating and some oocytes in various stages ofdevelopment,
Specimens of the common intertidal nemerteans Lineus ruber and L. viridis were collected fromsite... more Specimens of the common intertidal nemerteans Lineus ruber and L. viridis were collected fromsites along the west and Southwest coasts of Britain,northern France and North America. Allele frequenciesof up to 13 putative enzyme loci were estimated forall populations of L. ruber and L.viridis. Estimates of genetic variation were low forpopulations of L. ruber (Hobs 0.008–0.052)but were higher for populations of
A glandular cushion, called the pedal aperture gland in this paper, lies adjacent and internal to... more A glandular cushion, called the pedal aperture gland in this paper, lies adjacent and internal to each of the two mantle margins composing the pedal aperture of the soft-shelled clam Mya arenaria. Two types of glandular cells are found in the glands. The principal type (bacillary mucous cell) manufactures secretory vesicles that contain discrete protein-rich fibers in a matrix of glycoprotein. The second type (mucous goblet cell) produces sulfated and nonsulfated mucosubstances. The glands function in the formation of pseudofeces from particulate material, especially burrow sediments that enter the mantle cavity through the pedal aperture. Their possible phylogenetic relationship to similar glands in other bivalves is discussed briefly.
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