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FIGURE 2. Eremidrilus artzaini n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 2. Eremidrilus artzaini n. sp. from Summit Creek. A. Chaeta, VIII ventral. B. Atria, from a dissected worm. C. Atrium, sagittal section. D. Transverse section of atrium, near base of ampulla, with vas deferens deeply embedded in muscle layer. E. Vas deferens embedded in atrial muscle layer, from a transverse section. F. Detail of atrial ampulla, showing muscle layer, narrow epithelium and short prostates, transverse section. G. Male pore on small papilla within concave porophore, from a transverse section. H. First spermathecal ampulla, sagittal section. I, J. Spermathecal ducts, transverse sections. Note: in Figures 2A-C, the specimen is facing left.

FIGURE 1. Eremidrilus artzaini n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 1. Eremidrilus artzaini n. sp. from Wildhorse Creek (A); East Fork Big Lost River (B–D, F); Summit Creek (E). A. Anterior end, external view of an unmounted worm; arrows indicate limits of clitellum. B. Chaetal pairs; left to right: III dorsal, III ventral, XII ventral. C. Atria, transverse section in X. D. Spermathecae, transverse section in XI; arrows indicate position of ventral chaetae. E. Reproductive organs, segments X–XII; both spermathecal pairs with sperm. F. Reproductive organs, segments X–XII; sperm funnels and spermatheca in XII without sperm.

FIGURE 6. Eremidrilus owyhee n in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 6. Eremidrilus owyhee n. sp. All from type collection, except for Fig. 6A. A. Anterior part of the body. B. Male porophore. C. Atrium (composed of 2 photos). D. Ectal part of the spermatheca. E. Spermathecal ampulla showing spermatozoids, some with head oriented toward epithelium. F. Transverse section of the spermatheca pore opening within a lateral body fold, showing muscular fibers at retracted pore. G. Transverse body fold below the lateral line, containing the spermathecal pore (2 photos). H. Nephridium. (A, B, G, H, whole mounts; C–F histological sections. All scales are 50 µm, except for A: 500 µm.)

FIGURE 4. Eremidrilus chalonensis n in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 4. Eremidrilus chalonensis n. sp. All from type specimens. A. Anterior body section-bearing proboscis. B. Clitellum in XI. C, D. Atrium (complete in C) and male pore in prominent porophore. E, F. Spermatheca and glands around spermathecal pore. G. Spermathecal pore viewed from ventral surface. H. Nephridial vesicle in a whole-mount specimen (2 photos combined). I. Diatoms in the gut of the worms. (A, B, G, H, whole mounts; C–F, I, histological sections. All scales are 50 µm.)

FIGURE 3. Eremidrilus n in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 3. Eremidrilus n. spp. Drawings of the reproductive system for the 3 new species (all from type specimens). A–E. E. chalonensis, F–I. E. pinedai, J–M. E. owyhee. A, I, J: Reproductive organs in X–XI. B, G, L: View of atria and male pores in X, reconstructed from transverse sections. C, H, M: Spermathecae in XI, reconstructed from transverse sections. D: Ventrolateral view of E. chalonensis spermatheca, showing glands and muscular ring around pore. E: E. chalonensis nephridium, showing vesicle at nephridiopore. F: Detail of E. pinedai spermatheca, lateral view. K: Detail of E. owyhee male porophore and atrium, reconstructed from transverse sections. Arrows show the position of chaetal bundles (All scales are 100 µm.)

FIGURE 1. A in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 1. A. Map of all known Eremidrilus localities, including known and undescribed species. B. Detail of A, showing localities of the new species described here in relation to previously described species from small Pacific coastal drainages (Fend & Rodriguez 2003). Circles: species with one spermathecal segment; triangles: species with two spermathecal segments; black = described species; white = unknown species; gray = localities of E. felini, new finds and literature data combined.

FIGURE 2. Eremidrilus n in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 2. Eremidrilus n. spp. Drawings of whole mounted anterior ends, and representative chaetae pairs (left: dorsal, right: ventral) in middle segments of the 3 new species. A, D. E. chalonensis. B, E. E. pinedai. C, F. E. owyhee. (A–D, drawn from type specimens.)

FIGURE 7 in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 7. Comparative schematic drawings of the reproductive segments in the Eremidrilus species having one pair of spermathecae. Dashed line represents the lateral line; arrows indicate diagnostic characters.

FIGURE 10 in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 10. Eremidrilus allegheniensis (Cook, 1971). A. Atrium and prostate glands, Paratype 3472. B. Detail of atrium, Paratype 3471. C. Male porophore, Paratype 3471. D. Spermathecal papilla and pore, Paratype 3471. E. Spermathecal pore in XII and ventral gland in XIII, Paratype 3472. F. Spermatheca in XI, Paratype 3471. Note: specimens are facing left.

FIGURE 11 in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 11. Eremidrilus species having two spermathecal segments, schematic illustration comparing position and basic morphology of reproductive organs in X–XIII.

FIGURE 9 in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 9. Eremidrilus allegheniensis (Cook, 1971). A. Segments X–XIII of Paratype 3472, showing spermathecae and paired ventral glands. Spermathecal sperm with heads oriented to ectal wall of ampulla. Glands in XIII open slightly lateral to chaetae. B. Atrium of Paratype 3471, showing porophore and junction of anterior vas deferens with atrium (posterior vas was broken). Atrium extends into XI. Both drawings are reversed to face right for comparison with other species.

FIGURE 8. Eremidrilus gilita n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 8. Eremidrilus gilita n. sp., from Gilita Creek. A. Anterior end of a whole-mounted worm. B. Anterior dorsal chaeta, from a whole-mount. C. Male porophore with ectal end of atrial duct, from a whole-mount. D. Atrium and porophore, from a sagittal section. E. Spermathecae from a sagittal section. F. Spermathecal duct, sagittal section. G. Nephridium; inset shows the ectal vesicle near the pore, from a whole mount. H. Surface of clitellum, with spermathecal pore in segment XI, close to intersegment 11/12. Note: specimens are facing left.

FIGURE 6. Eremidrilus montanensis n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 6. Eremidrilus montanensis n. sp. from Eureka Creek. A. Ventral chaetae in segments II–IV (composite of three photos), from a dissected worm. B. Atrium, with male pore opening on a low mound (composite of three photos), from a dissected worm. C. Atrium, from a transverse section. D, E, atrium in sagittal sections, showing vas deferens joining atrium in ental part (E). F. Spermatheca and female funnel in sagittal section. G. Spermatheca in transverse section. H. Spermatheca in XI, from a dissected worm. Note: in Figures 6A,B,H, the specimen is facing left.

FIGURE 4. Eremidrilus humboldti n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 4. Eremidrilus humboldti n. sp. from Corral Creek A. Porophore with male pore from a whole mount. B. Atrium photographed at different focal plane of the same preparation in A. C. Atrium showing apical junction of vas deferens. D. Spermatheca in XII, ampulla extending into XIII, from a whole mount. E. Spermatheca, showing ampulla and duct (insert, in a separate plane). F. Spermathecal duct, detail, from a whole mount.

FIGURE 7. Eremidrilus gilita n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 7. Eremidrilus gilita n. sp., from Gilita Creek. A. Anterior ends, external view of unmounted worms, both with pharynx partially everted. B. Chaetae; left to right: dorsal pair in IV, ventral chaeta in VI. C. Reproductive organs, segments X–XIII. D. Reproductive organs, segments IX–XI (second spermatheca was broken).

FIGURE 3. Eremidrilus humboldti n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 3. Eremidrilus humboldti n. sp. from Corral Creek (A, B, D, and Trail Creek (C, E). A. Anterior end, external view of an unmounted worm, showing position of genital pores. B. Two chaetal pairs; IX ventral (left) and XIV dorsal (right). C–E, reproductive organs in X–XII: C. Ventrolateral view of a mature worm; D. lateral view of a recently-mated worm, second spermatheca (in XII) without sperm; E. a slightly post-mature worm (mated, but sperm funnels without sperm; at a later stage than D).

FIGURE 5. Eremidrilus montanensis n in New Eremidrilus species (Clitellata: Lumbriculidae) from western North America Part 1, species with two spermathecal segments

FIGURE 5. Eremidrilus montanensis n. sp. All specimens from Eureka Creek. A. Anterior ends, external view of unmounted worms, upper unmated, with partial proboscis and pharynx partially everted; lower mature, mated, with proboscis broken. B. Chaetal pairs, ventral; left to right: VII, XXV; in both cases, the inner chaeta is longer than the outer, with a more proximal nodulus. C. Atria, transverse section in X. D. Spermathecae, transverse section in XI; arrows indicate position of chaetae. E. Male ducts, segment X. F. Reproductive organs, segments X–XII.

FIGURE 5. Eremidrilus pinedai n in New Nearctic Eremidrilus species (Clitellata: Lumbriculidae). Part 2, western species with one spermathecal segment

FIGURE 5. Eremidrilus pinedai n. sp. A. Clitellum. B, C. Atrium. D. Transverse section showing the male pore at the porophore. E. Atrium and sperm funnel. F. Spermatheca and female funnel. G. A variety of diatoms in the digestive track of the worms. (A, C, whole mount of paratype; B, D–F histological sections of paratypes; G, whole mounts from individuals in type locality. All scales are 50 µm.)