22,970 research outputs found
Helobdella modesta Siddall et al. 2005
No full textHelobdella modesta (Verrill, 1872) Siddall et al., 2005 Figure 16 Specimens all correspond to the description of H. modesta due to the presence of an obvious chitinous nuchal scute on the dorsal surface of VIII, one pair of eyespots, and the absence of dorsal or ventral papillation or pigmentation. The presence of a nuchal scute had led previous taxonomists to synonymize almost every previously described species exhibiting this characteristic under the name Helobdella stagnalis Linnaeus, 1758. Siddall et al. (2005), using a phylogenetic perspective, resurrected Helobdella modesta (Verrill, 1872) for the North American species. Found on the underside of submerged rocks and wood.Published as part of Oceguera-Figueroa, Alejandro, Kvist, Sebastian, Watson, Sara C., Sankar, Dominic F., Overstreet, Robin M. & Siddall, Mark E., 2010, Leech Collections from Washington State, with the Description of Two New Species of Placobdella (Annelida: Glossiphoniidae), pp. 1-16 in American Museum Novitates 2010 (3701) on page 10, DOI: 10.1206/3701.2, http://zenodo.org/record/535918
Erpobdella obscura Siddall 2002
No full textErpobdella obscura (Verrill, 1872) Siddall, 2002 Figure 21 The presence of four pairs of eyespots, colored patches dispersed on the dorsal and ventral surface, two annuli between gonopores, spirally coiled atrial cornua, ejaculatory ducts forming preatrial loops, and a relatively large size correspond to the description of Erpobdella obscura (see Klemm, 1982). Found on the underside of submerged rocks and wood.Published as part of Oceguera-Figueroa, Alejandro, Kvist, Sebastian, Watson, Sara C., Sankar, Dominic F., Overstreet, Robin M. & Siddall, Mark E., 2010, Leech Collections from Washington State, with the Description of Two New Species of Placobdella (Annelida: Glossiphoniidae), pp. 1-16 in American Museum Novitates 2010 (3701) on page 12, DOI: 10.1206/3701.2, http://zenodo.org/record/535918
Linta WESTERGREN & SIDDALL 2004, new genus
No full textLinta, new genus Figures 1–8 DESCRIPTION: Body cylindrical, vermiform (fig. 1). Anterior somites with five pairs of eyespots arranged in parabolic arc (figs. 2, 3). Eyes dorsal on II and III (fig. 2), lateral on IV, V, and VI (fig. 3). Pharynx terminating in XIV with three myognaths (muscular jaws) separated by triangular paragnaths (fig. 4); each myognath with a pair of stylets parallel to body axis (fig. 4). Male and female gonopores ventral in XII and XIII (fig. 5). Accessory copulatory pits absent. Ovarian tissue consisting of ovisacs and oviducts, paired, caecate, without common oviduct (fig. 6). Male median reproductive apparatus large with pair of atrial horns directed posteriolaterally (fig. 7); ‘‘prostate’’ glandular tissue situated anterior at junction of atria (figs. 6, 7). Spermducts thick, in loose coil from atria to XV (fig. 7). Testisacs paired, arranged interganglionically in paramedial rows of six (fig. 8); first group at XV/XVI. TYPE SPECIES: Linta be, n.sp. ETYMOLOGY: ‘‘ Linta ’’ is a Malagasy word in the Antanosy dialect for ‘‘leech’’, commonly used for the aquatic as opposed to the terrestrial varieties (limatika); originally from the Indonesian lintah for leech.Published as part of WESTERGREN, STEPHANIE & SIDDALL, MARK E., 2004, Two New Species of Salifid Leeches (Arhynchobdellida: Erpobdelliformes: Salifidae) from South Africa and Madagascar, pp. 1-7 in American Museum Novitates 3456 (1) on pages 2-3, DOI: 10.1206/0003-0082(2004)4562.0.CO;2, http://zenodo.org/record/538257
Parapraobdella Phillips & Oosthuizen & Siddall 2011, new genus
No full textParapraobdella, new genus Figures 1–3 DESCRIPTION: Trignathous, monostichodont. Longitudinal furrow in dorsal lip of oral sucker. Complete somite five-annulate. Eyespots dorsal, five pair in broad arch. Crop ceca simple with one pair of ceca per somite, postceca extending bilaterally. Intestine simple, acecate. Anus between last annulus and caudal sucker. Caudal sucker wider than four most posterior somites of body. Reproductive organs micromorphic. Nephridia ventral and bilateral in all cases. TYPE SPECIES: Parapraobdella lineata (Sciacchitano, 1959) ETYMOLOGY: From para (Greek for “alongside”), because it is close to the genus Praobdella.Published as part of Phillips, Anna J., Oosthuizen, J. H. & Siddall, Mark E., 2011, Redescription, phylogenetic placement, and taxonomic reassignment of Mesobdella lineata (Sciacchitano, 1959) (Hirudinida: Arhynchobdellida), pp. 1-12 in American Museum Novitates 2011 (3711) on page 6, DOI: 10.1206/3711.2, http://zenodo.org/record/535935
Paleo-circulation of the Red Sea and global sea level
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Helobdella papillata Siddall and Borda 2003
No full textHelobdella papillata (Verrill, 1872) Siddall and Borda, 2003 Figure 17 The presence of one pair of eyespots, longitudinal dorsal pigmented stripes, and rows of black-tipped papillae as well as one annulus between gonopores and diffuse salivary glands match the description of Helobdella papillata. This species belongs to the “ triserialis ” complex of species defined by Sawyer, 1986. Helobdella triserialis (Blanchard, 1894) was originally described based on specimens collected in Chile. However, because of the high degree of variation in the various forms in the New World, Ringuelet (1943) lumped them all under “ H. triserialis. ” Siddall and Borda (2003) found that at least North and South American forms each constitute distinct evolutionary lineages and resurrected Verrill’s name, Helobdella papillata, for North American forms, all of which are genetically similar regardless of pigmentation. Specimens were found on the underside of submerged rocks and wood.Published as part of Oceguera-Figueroa, Alejandro, Kvist, Sebastian, Watson, Sara C., Sankar, Dominic F., Overstreet, Robin M. & Siddall, Mark E., 2010, Leech Collections from Washington State, with the Description of Two New Species of Placobdella (Annelida: Glossiphoniidae), pp. 1-16 in American Museum Novitates 2010 (3701) on page 10, DOI: 10.1206/3701.2, http://zenodo.org/record/535918
Hirudinea from the Apolobamba in the Bolivian Andes, Including Three New Species of Helobdella (Clitellata: Hirudinea)
No full textSIDDALL, MARK E. (2001): Hirudinea from the Apolobamba in the Bolivian Andes, Including Three New Species of Helobdella (Clitellata: Hirudinea). American Museum Novitates 3341: 1-15, DOI: 10.1206/0003-0082(2001)3412.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282001%29341%3C0001%3AHFTAIT%3E2.0.CO%3B
Evaluating hypotheses on the origin and diversification of the ringneck snake Diadophis punctatus (Colubridae: Dipsadinae)
No full textFontanella, Frank, Siddall, Mark E. (2010): Evaluating hypotheses on the origin and diversification of the ringneck snake Diadophis punctatus (Colubridae: Dipsadinae). Zoological Journal of the Linnean Society 158 (3): 629-640, DOI: 10.1111/j.1096-3642.2009.00554.x, URL: http://dx.doi.org/10.1111/j.1096-3642.2009.00554.
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