Seguenzia macleani Geiger, 2017

Geiger, Daniel L., 2019, The Family Seguenziidae Verrill, 1884 in the Northeast Pacific, including a comment on excessive numbers of taxonomic data portals, Zoosymposia 13, pp. 61-69 : 64-65

Seguenzia macleani Geiger, 2017

( Figure 2 C–D)

Seguenzia macleani Geiger, 2017: 231 , figs 25–28. Holotype LACM 3321 , 5100 m, Aleutian Trench , Alaska.

Description. Shell to 9.6 mm, globular inflated, suture little impressed; spiral cords decreasing in strength from shoulder to base, one on shoulder, one at suture, a good dozen on base; crossed by fine axial lines; umbilicus wide, no funiculus; columella not thickened.

Distribution. Western Aleutian Islands, Alaska (175˚W) to off Oregon (45˚N). Abyssal plain, 5100 m.

Figures

FIGURE 2. A–B. Seguenzia cervola Dall, 1919. A. 1130–1266 m, off North Coronado Island, Baja California (USNM 209229, holotype), 4.5 mm. B. 3592–3798 m, SW of Farallon Islands and W of Pioneer Seamount, off San Francisco County, California (USNM 701260, holotype of S. megaloconcha), 9.2 mm. C–D. Seguenzia macleani Geiger, 2017. C. 5100 m, Aleutian Trench at 175° 44' E (LACM 3321), holotype, 8.7 mm. D. 5180 m, abyssal plain W of Oregon, S of Gulf of Alaska (approximately 45° N, 153.8° W) (LACM 3486, paratype), 9.6 mm. E–F. Seguenzia giovia Dall, 1919. E. 874–1097 m, off Santa Catalina Island, Los Angeles County, California (USNM 209228, holotype), 6 mm. F. 3900 m, Tufts Abyssal Plain, W of Lincoln County, Oregon (LACM 2065, holotype of S. quinni), 7.6 mm. G–H. Seguenzia stephanica Dall, 1908. G. 2816 m, Cascadia Abyssal Plain, off Oregon (LACM 70-140.5), 7.1 mm. H. 5100 m, Aleutian Trench, Alaska at 44° N, 175° E (LACM), 5.2 mm.