Resurrection and redescription of Clepsine pallida Verrill, 1872 (Hirudinida, Glossiphoniidae) with a phylogeny of the genus Alboglossiphonia Author Moser, William E. https://orcid.org/0000-0002-5265-9347 Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, Museum Support Center MRC 534, 4210 Silver Hill Road, Suitland, MD 20746, USA moserw@si.edu Author Richardson, Dennis J. School of Biological Sciences, Quinnipiac University, 275 Mt. Carmel Avenue, Hamden, CT 06518, USA Author Hammond, Charlotte I. School of Biological Sciences, Quinnipiac University, 275 Mt. Carmel Avenue, Hamden, CT 06518, USA Author Rojas, Lourdes Division of Invertebrate Zoology, Peabody Museum of Natural History, Yale University, P. O. Box 208118, New Haven, CT 06520, USA Author Lazo-Wasem, Eric Division of Invertebrate Zoology, Peabody Museum of Natural History, Yale University, P. O. Box 208118, New Haven, CT 06520, USA Author Phillips, Anna J. https://orcid.org/0000-0003-4883-0022 Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology, 10 th St and Constitution Ave, NW, Washington, DC 20560 - 0163, USA text ZooKeys 2022 2022-11-02 1127 135 154 http://dx.doi.org/10.3897/zookeys.1127.86004 journal article http://dx.doi.org/10.3897/zookeys.1127.86004 1313-2970-1127-135 33659F1CC6314111B85BC0FA6D2787C4 A853D42B0ACF5AC78F26BAEDFF0E2C0C Alboglossiphonia pallida (Verrill, 1872) comb. nov. Figs 2 , 3 , 4 , 5 Diagnosis. Dark chromatophores on the dorsal surface arranged lateral to patrilaterally and medially as a thin line or interrupted thin line along with three pair of eye spots (where the first pair are closest together), six pair of crop ceca, and a united gonopore. External morphology. Body narrowly ovoid to narrowly pyriform. Rounded anterior region. Dorsum buff to translucent, smooth (without papillae), and with small, black chromatophores that form thin lines with scattered areas; thin, interrupted mid-dorsal line with larger chromatophore patches (typically on sensory annuli); black chromatophores in a lateral pattern on the sensory annulus of the lateral to paralateral region (Figs 2 , 3 ). Three pair of eye spots which are typically separate and arranged linearly or with groupings of two and four eye spots in unpigmented cephalic area with the first pair of eye spots closest together (Figs 3 , 4 ). Some individuals have five eye spots where the first pair is present and there are only three eye spots in the second and third pair. Caudal sucker of moderate size (half diameter of mid-body) without pigment or papillae. Ventrum without pigment or papillae and with united male and female gonopores (single opening) (Fig. 2 ). Figure 3. Living specimen of Alboglossiphonia pallida (Verrill, 1872) from the type locality of New Haven County, Connecticut, USA. YPM IZ 106029, dorsal surface Scale bar: 1 mm. Figure 4. Images of the arrangement of eyespots of Alboglossiphonia pallida (Verrill, 1872) A YPM IZ 106029 B USNM 1662161 C YPM IZ 062698 D YPM IZ 107064. Alimentary tract. Cylindrical, blunt-tipped protrusible proboscis (approximate length of 14 annuli), opening at the center of the oral sucker. Short esophagus and diffuse salivary glands that are distributed in the anterior third of the body (Fig. 5 ). Crop with six pair of ceca and last pair extend posteriad and diverticulated with four sections; four pair of simple, saccular intestinal ceca with hind gut saccate and rectum opening into anus, located one annulus anteriad of the caudal sucker (Fig. 5 ). Figure 5. Schematic drawing of the internal morphology of Alboglossiphonia pallida (Verrill, 1872). Abbreviations: AC, atrial cornuae; CC, crop ceca; HG, hind gut; IC, intestinal ceca; O, ovisac; PR, proboscis; SC, salivary cells; T, testisac. Reproductive anatomy. Male atrium opening into paired narrowly ovoid atrial cornua that extends laterally and narrows abruptly at junction with ejaculatory ducts and extends posteriad (Fig. 5 ). Six pair of testisacs between crop ceca. Pair of tubular ovisacs; length of ovisacs dependent on the reproductive state of the leech (Fig. 5 ). Male and female gonopores united.