Deep-water Rissoidae of the genera Benthonella Dall, 1889 and Benthonellania Lozouet, 1990 (Gastropoda, Caenogastropoda, Rissooidea) from French Polynesia
Author
Amati, Bruno
Largo Giuseppe Veratti, 37 / D, 00146 Roma (Italy)
bruno_amati@yahoo.it
Author
Giulio, Andrea Di
Dipartimento di Scienze, Università “ Roma Tre ”, Viale Marconi, 446, 00146 Roma (Italy) & Laboratorio Interdipartimentale di Microscopia Elettronica (LIME), Università “ Roma Tre ”, Roma (Italy)
andrea.digiulio@uniroma3.it
Author
Oliverio, Marco
Dipartimento di Biologia e Biotecnologie ‘ Charles Darwin’, Sapienza Università di Roma, Viale dell’Università 32, I- 00185 Roma (Italy)
marco.oliverio@uniroma1.it
text
Zoosystema
2022
2022-06-28
44
12
335
389
journal article
89521
10.5252/zoosystema2022v44a12
7ccbafc8-5635-41f4-a7da-05f303b9bb8e
1638-9387
6794846
urn:lsid:zoobank.org:pub:ECBC345E-3870-4935-B430-744969F3DFD4
APPENDIX 14. — Measurements of teleoconch and protoconch of Benthonellania maestratii n. sp. in mm, with range, mean and standard deviation: 1, holotype, Australes, Recif Neilson, 560-790 m depth; 2, Australes, Côte Sud de Rurutu, 520-950 m depth; 3, Australes, Côte Sud de Rurutu, 520-950 m depth.| Teleoconch | 1 | 2 | 3 | Min–max | Mean | Std |
|---|
| Heigth | 2.50 | 3.12 | 2.80 | 2.50-3.12 | 2.806667 | 0.310054 |
|---|
| Width | 1.62 | 2.07 | 1.85 | 1.62-2.07 | 1.846667 | 0.225019 |
|---|
| Height/Width ratio | 1.538 | 1.507 | 1.513 | 1.507-1.538 | 1.519333 | 0.016442 |
|---|
| Aperture heigth | 1.10 | 1.35 | 1.30 | 1.10-1.35 | 1.25 | 0.132288 |
|---|
| Height/Height aperture ratio | 2.272 | 2.311 | 2.154 | 2.154-2.311 | 2.245667 | 0.081746 |
|---|
| Height last whorl | 1.75 | 2.15 | 1.95 | 1.75-2.15 | 1.95 | 0.2 |
|---|
| Height/Height last whorl ratio | 1.428 | 1.451 | 1.436 | 1.428-1.451 | 1.438333 | 0.011676 |
|---|
| No. of whorls | 3.2 | 3.5 | 3.25 | 3.2-3.5 | 3.316667 | 0.160728 |
|---|
| No. axial ribs on last whorl | 35 | 57 | 45 | 35-57 | 45.66667 | 11.01514 |
|---|
| No. spiral cords on last whorl | 22 | 32 | 35 | 22-35 | 29.66667 | 6.806859 |
|---|
| Varix | yes | yes | yes | yes | yes | – |
|---|
| Umbilical chink | yes | yes | yes | yes | yes | – |
|---|
| Protoconch | 1 | 2 | 3 | Min-max | Mean | Std |
|---|
| Heigth | 0.325 | 0.400 | 0.362 | 0.325-0.400 | 0.362333 | 0.037501 |
|---|
| Diameter of nucleus | 0.062 | 0.075 | 0.087 | 0.062-0.087 | 0.074667 | 0.012503 |
|---|
| Diameter of first half whorl | 0.150 | 0.150 | 0.150 | 0.150 | 0.15 | 0 |
|---|
| Maximum diameter | 0.450 | 0.475 | 0.487 | 0.450-0.487 | 0.470667 | 0.018877 |
|---|
| No. of whorls | 2.3 | 2.25 | 2.3 | 2.25-2.3 | 2.283333 | 0.028868 |
|---|
| Multispiral | yes | yes | yes | yes | yes | – |
|---|
| Paucispiral | no | no | no | no | no | – |
|---|