. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. gland cells middle sensory layer muscle Figure 25. Spinula subexcisa. Diagrammatic view ot mantle margin cut transversely ttirough ttie anterior part ot the anterior sense organ. leri, S. scheltemai, and the unnamed species, live in abyssal depths (2500- 5000 m), while S. filatovae is present at lower slope depths (1200-1800 m), and S. subexcisa is probably found on the lower slope and upper abyssal rise (1800-2500 m). All species, except S. hilleri, have somewhat restricted distributions. S. hilleri is found in the W
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. gland cells middle sensory layer muscle Figure 25. Spinula subexcisa. Diagrammatic view ot mantle margin cut transversely ttirough ttie anterior part ot the anterior sense organ. leri, S. scheltemai, and the unnamed species, live in abyssal depths (2500- 5000 m), while S. filatovae is present at lower slope depths (1200-1800 m), and S. subexcisa is probably found on the lower slope and upper abyssal rise (1800-2500 m). All species, except S. hilleri, have somewhat restricted distributions. S. hilleri is found in the West Europe, Canary, Cape Verde, Brazil, Angola, and Argentine Basins. It is moderately abun- dant, numerically forming more than 10% of the protobranch fauna in 3 of the 17 stations where it was found. Spinula scheltemai is present in the Argentine and Guiana Basins. In the fonner basin, it is numerically abundant, forming more than 10% of the protobranchs in two of the three samples that contained it. S. subexcisa has been found only in the. aperture Figure 26. Spinula subexcisa. A. Transverse section througti sensory tentacle. B. Transverse section through 'byssal' gland and foot musculature. West Europe Basin where it is a common faunal constituent. In contrast, the un- named species limited in our samples to the North America Basin, is a rare species. We have collected but a single individual in each of three samples, yet this is one of the most extensively sam- pled deep-sea basins. The slope-dwelling species, S. filato- vae, occurs in the northeastern Atlantic and was present at single stations in the West Europe and Cape Verde Basins, nu- merically comprising 5% and 6% respec- tively of the protobranchs in these sam- ples. It occurs at similar depths in the Guinea Basin. Curiously, it is the only species of those described here that, to date, has been recorded outside the At-. Please note that these images are extracted from scanned page images that may have been digital
Size: 1782px × 1403px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
