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 6. — Measurements of teleoconch and protoconch of Benthonellania thielei n. sp. in mm, with range, mean and standard deviation: 1, holotype, off southern Somalia, 693 m depth; 2-4, paratypes off southern Somalia, 693 m depth.

Teleoconch	1	2	3	4	Min-max	Mean	Std	1	2	Min-max	Mean	Std
Heigth	3.05	3.20	2.55	2.97	2.55-3.20	2.9425	0.278493	1.80	1.95	1.80-1.95	1.875	0.106066
Width	1.92	2.05	1.82	1.95	1.82-2.05	1.935	0.094692	1.35	1.37	1.35-1.37	1.36	0.014142
Height/Width ratio	1.588	1.561	1.401	1.523	1.401-1.588	1.51825	0.082589	1.333	1.423	1.333-1.423	1.378	0.06364
Aperture heigth	1.35	1.30	1.20	1.27	1.20-1.35	1.28	0.062716	1.0	1.02	1.0-1.02	1.01	0.014142
Height/Height aperture ratio	2.259	2.461	2.125	2.338	2.125-2.461	2.29575	0.140948	1.800	1.911	1.800-1.911	1.8555	0.078489
Height last whorl	2.2	2.2	2.0	2.1	2.0-2.2	2.125	0.095743	1.50	1.47	1.47-1.50	1.485	0.021213
Height/Height last whorl ratio	1.386	1.454	1.275	1.414	1.275-1.454	1.38225	0.076752	1.200	1.326	1.200-1.326	1.263	0.089095
No. of whorls	3.50	3.60	3.35	3.35	3.35-3.60	3.45	0.122474	2.80	2.65	2.65-2.80	2.725	0.106066
No. axial ribs on last whorl	20	14	13	18	13-20	16.25	3.304038	17	18	17	17.5	0.707107
No. spiral cords on last whorl	6	4	5	6	4-6	5.25	0.957427	no	no	no	no	–
Varix (yes-no)	no	no	no	no	no	no	–	no	no	no	no	–
Umbilical chink (yes-no)	no	yes	no	yes	no-yes	no-yes	–	yes	yes	yes	yes	–
Protoconch	1	2	3	4	Min-max	Mean		1	2	Min-max	Mean	Std
Heigth	0.337	0.350	0.312	0.300	0.300-0.350	0.32475	0.022824	0.275	0.275	0.275	0.275	0
Diameter of nucleus	0.187	0.212	0.212	0.187	0.187-0.212	0.1995	0.014434	0.075	0.075	0.075	0.075	0
Diameter of first half whorl	0.350	0.337	0.350	0.350	0.337-0.350	0.34675	0.0065	0.150	0.137	0.137-0.150	0.1435	0.009192
Maximum diameter	0.475	0.425	0.400	0.425	0.400-0.475	0.43125	0.031458	0.400	0.450	0.400-0.450	0.425	0.035355
No. of whorls	1.10	1.15	1.10	1.25	1.10-1.25	1.15	0.070711	2.0	2.2	2.0-2.2	2.1	0.141421
Multispiral	no	no	no	no	no	no	–	yes	yes	yes	yes	–
Paucispiral	si	si	si	si	yes	yes	–	no	no	no	no	–