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 11. — Measurements of teleoconch and protoconch of Benthonellania megan n. sp. in mm, with range, mean and standard deviation: 1, holotype, Marquesas, Fatu Hiva, 1150-1250 m depth; 2, paratype, Marquesas: Fatu Hiva, 1150-1250 m depth; 3-5, paratypes Marquesas, Fatu Hiva, 1150-1250 m depth; 6, Australes, Rimatara, 1200-1226 m depth.| Teleoconch | 1 | 2 | 3 | 4 | 5 | 6 | Min-max | Mean | Std |
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| Heigth | 2.70 | 2.50 | 2.60 | 2.55 | 2.40 | 2.62 | 2.40-2.70 | 2.561667 | 0.104003 |
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| Width | 1.60 | 1.47 | 1.50 | 1.60 | 1.50 | ? | 1.47-1.60 | 1.534 | 0.061482 |
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| Height/Width ratio | 1.687 | 1.695 | 1.733 | 1.594 | 1.600 | ? | 1.594-1.733 | 1.6618 | 0.06169 |
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| Aperture heigth | 1.10 | 1.0 | 1.05 | 1.05 | 1.0 | 1.07 | 1.0-1.10 | 1.045 | 0.03937 |
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| Height/Height aperture ratio | 2.454 | 2.500 | 2.476 | 2.428 | 2.400 | 2.448 | 2.400-2.500 | 2.451 | 0.03514 |
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| Height last whorl | 1.75 | 1.60 | 1.70 | 1.70 | 1.65 | 1.70 | 1.60-1.75 | 1.683333 | 0.05164 |
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| Height/Height last whorl ratio | 1.542 | 1.562 | 1.523 | 1.500 | 1.454 | 1.541 | 1.454-1.562 | 1.520333 | 0.038609 |
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| No. of whorls | 3.5 | 3.35 | 3.5 | 3.25 | 3.2 | 3.5 | 3.2-3.5 | 3.383333 | 0.136626 |
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| No. axial ribs on last whorl | 16 | 16 | 17 | 19 | 17 | 14 | 14-19 | 16.5 | 1.643168 |
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| No. spiral cords on last whorl | 3 | 4 | 3 | 3 | 3 | 3 | 3-4 | 3.166667 | 0.408248 |
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| Varix | no | no | no | no | no | no | no | no | – |
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| Umbilical false chink | yes | yes | yes | yes | yes | yes | yes | yes | – |
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| Protoconch | 1 | 2 | 3 | 4 | 5 | 6 | Min-max | Mean | Std |
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| Heigth | 0.400 | 0.375 | 0.387 | 0.375 | 0.375 | 0.412 | 0.375-0.412 | 0.387333 | 0.015655 |
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| Diameter of nucleus | 0.095 | 0.062 | 0.075 | 0.087 | 0.087 | 0.087 | 0.062-0.095 | 0.082167 | 0.011771 |
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| Diameter of first half whorl | 0.162 | 0.175 | 0.150 | 0.150 | 0.150 | 0.162 | 0.150-0.175 | 0.158167 | 0.010128 |
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| Maximum diameter | 0.437 | 0.450 | 0.437 | 0.425 | 0.437 | 0.437 | 0.425-0.450 | 0.437167 | 0.00791 |
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| No. of whorls | 2.5 | 2.3 | 2.4 | 2.4 | 2.3 | 2.5 | 2.3-2.5 | 2.4 | 0.089443 |
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| Multispiral | yes | yes | yes | yes | yes | yes | yes | yes | – |
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| Paucispiral | no | no | no | no | no | no | no | no | – |
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