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 1. — Measurements of teleoconch and protoconch of Benthonella boucheti n. sp. in mm, with range, mean and standard deviation: 1, holotype, Tarava Seamounts, Mont Honu, 787-798 m depth; 2, Australes, Banc Président Thiers, 500-850 m depth.| Teleoconch | 1 | 2 | Min-max | Mean | Std |
|---|
| Heigth | 4.32 | 3.75 | 3.75-4.32 | 4.03 | 0.403051 |
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| Width | 2.75 | 2.60 | 2.60-2.75 | 2.67 | 0.106066 |
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| Height/Width ratio | 1.572 | 1.442 | 1.442-1.572 | 1.507 | 0.091924 |
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| Aperture heigth | 2.0 | 1.90 | 1.90-2.0 | 2.05 | 0.070711 |
|---|
| Height/Height aperture ratio | 2.162 | 1.973 | 1.973-2.162 | 2.067 | 0.133643 |
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| Height last whorl | 2.90 | 2.80 | 2.80-2.90 | 2.85 | 0.070711 |
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| Height/Height last whorl ratio | 1.491 | 1.351 | 1.351-1.491 | 1.421 | 0.098995 |
|---|
| No. of whorls | 4.2 | 3.4 | 3.4-4.2 | 3.8 | 0.565685 |
|---|
| No. axial ribs on last whorl | 20 | 21 | 20-21 | 20.5 | 0.707107 |
|---|
| No. spiral cords on last whorl | 7 | 6 | 6-7 | 6.5 | 0.707107 |
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| Varix | no | no | no | no | – |
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| Umbilical false chink | yes | yes | yes | yes | – |
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| Protoconch | 1 | 2 | Min-max | Mean | Std |
|---|
| Heigth | 0.412 | 0.425 | 0.412-0.425 | 0.418 | 0.009192 |
|---|
| Diameter of nucleus | 0.075 | 0.087 | 0.075-0.087 | 0.081 | 0.008485 |
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| Diameter of first half whorl | 0.137 | 0.125 | 0.125-0.137 | 0.131 | 0.008485 |
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| Maximum diameter | 0.600 | 0.570 | 0.570-0.600 | 0.580 | 0.021213 |
|---|
| No. of whorls | 2.4 | 2.5 | 2.4-2.5 | 2.45 | 0.070711 |
|---|
| Multispiral | yes | yes | yes | yes | – |
|---|
| Paucispiral | no | no | no | no | – |
|---|