608 research outputs found
Letter: John Siddall to Ida M. Tarbell and Albert Boyden
No full textLetter with draft of The Conscience of John W. Steel
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
- …
