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 4. — Measurements of teleoconch and protoconch of Benthonellania hertzogi (Thiele, 1925) n. comb. in mm, with range, mean and standard deviation: 1, 2, south of South Africa, 126 m depth. Symbol: *, last rib thicker, similar to a varix.| Teleoconch | 1 | 2 | Min-max | Mean | Std | 1 | 2 | 3 | 4 | Min-max | Mean | Std |
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| Heigth | 2.85 | 2.47 | 2-47-2-85 | 2.66 | 0.27 | 3.85 | 3.7 | 3.35 | 4 | 3.35-4 | 3.725 | 0.278388 |
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| Width | 1.95 | 1.75 | 1.75-1.95 | 1.85 | 0.14 | 2.15 | 2.35 | 2.02 | 2.15 | 2.02-2.35 | 2.1675 | 0.136229 |
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| Height/Width ratio | 1.461 | 1.411 | 1.411-1.461 | 1.436 | 0.035 | 1.790 | 1.574 | 1.658 | 1.860 | 1.574-1.860 | 1.7205 | 0.128658 |
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| Aperture heigth | 1.40 | 1.25 | 1.25-1.40 | 1.325 | 0.106 | 1.55 | 1.50 | 1.25 | 1.40 | 1.25-1.55 | 1.425 | 0.132288 |
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| Height/Height aperture ratio | 2.036 | 1.976 | 1.976-2-036 | 2.006 | 0.042 | 2.483 | 2.466 | 2.680 | 2.857 | 2.466-2.857 | 2.6215 | 0.184612 |
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| Height last whorl | 2.07 | 1.80 | 1.80-2.07 | 1.935 | 0.191 | 2.50 | 2.55 | 2.25 | 2.45 | 2.25-2.55 | 2.4375 | 0.131498 |
|---|
| Height/Height last whorl ratio | 1.377 | 1.372 | 1.372-1.377 | 1.3745 | 0.004 | 1.540 | 1.451 | 1.488 | 1.632 | 1.451-1.632 | 1.52775 | 0.078504 |
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| No. of whorls | 3.10 | 2.75 | 2.75-3.10 | 2.925 | 0.247 | 4.10 | 3.50 | 3.70 | 4.25 | 3.50-4.25 | 3.8875 | 0.347311 |
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| No. axial ribs on last whorl | 26 | 24 | 24-26 | 25 | 1.4 | 9 | 10 | 8 | 8 | 8-10 | 8.75 | 0.957427 |
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| No. spiral cords on last whorl | 5 | 4 | 4-5 | 4.5 | 0.7 | 4 | 4 | 3 | 4 | 3-4 | 3.75 | 0.5 |
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| Varix (yes-no) | no | no* | no | no | – | no | no | no | no | no | no | – |
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| Umbilical chink (yes-no) | yes | yes | yes | yes | – | yes | yes | yes | yes | yes | yes | – |
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| Protoconch | 1 | 2 | Min-max | Mean | Std | 1 | 2 | 3 | 4 | Min-max | Mean | Std |
|---|
| Heigth | 0.375 | 0.400 | 0.375-0.400 | 0.388 | 0.018 | 0.375 | 0.450 | 0.412 | 0.437 | 0.375-0.450 | 0.4185 | 0.03301 |
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| Diameter of nucleus | 0.212 | 0.200 | 0.200-0.212 | 0.206 | 0.008 | 0.200 | 0.250 | 0.275 | 0.225 | 0.200-0.275 | 0.2375 | 0.032275 |
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| Diameter of first half whorl | 0.362 | 0.350 | 0.350-0.362 | 0.356 | 0.008 | 0.362 | 0.387 | 0.425 | 0.387 | 0.362-0.425 | 0.39025 | 0.025992 |
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| Maximum diameter | 0.500 | 0.500 | 0.500 | 0.5 | 0 | 0.525 | 0.575 | 0.575 | 0.525 | 0.525-0.575 | 0.55 | 0.028868 |
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| No. of whorls | 1.25 | 1.25 | 1.25 | 1.25 | 0 | 1.40 | 1.40 | 1.25 | 1.30 | 1.25-1.40 | 1.3375 | 0.075 |
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| Multispiral | no | no | no | no | – | no | no | no | no | no | no | – |
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| Paucispiral | yes | yes | yes | yes | – | yes | yes | yes | yes | yes | yes | – |
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