Cosmotriphora arnoldoi Faber & Moolenbeek, 1991

Fernandes, Maurício Romulo & Pimenta, Alexandre Dias, 2020, Unraveling one of the ‘ Big Five’: update of the taxonomy of Triphoridae (Gastropoda, Triphoroidea) from Brazil, European Journal of Taxonomy 665 (665), pp. 1-170 : 140-141

Cosmotriphora arnoldoi Faber & Moolenbeek, 1991

Fig. 87

Cosmotriphora arnoldoi Faber & Moolenbeek, 1991: 81 , figs 1–2.

Triphora sp. D – Rice & Kornicker 1962: 120, pl. 2 fig. 17.

Cosmotriphora arnoldoi – Rolán & Fernández-Garcés 1994: 20, figs 12–15; 2007: 20, pl. 1 figs 19–21. — Lee 2009: 88. — Garcia & Lee 2011. — Fernandes et al. 2013: 4, figs 2, 18, 29.

Material examined

BRAZIL – Rio Grande do Norte • 2 specs; BPot 1-MR42; MNRJ 31497 * • 1 spec.; 04º44′53″ S, 36º25′27″W; depth 102–108 m; 23 May2011; MNRJ 35117 *. – Sergipe • 1spec.; Petro/UFS st. 12.1; UFS • 2 specs; Petro/UFS st. 18.1; UFS. – Bahia • 3 specs; Ilhéus; MNRJ 32378 * • 1 spec.; Canavieiras; Apr. 2011; MNRJ 30756 *. – Espírito Santo • 2 specs; REVIZEE-Central C1-C65; MORG 52597 • 9 specs; REVIZEE-Central C1-VV38; IBUFRJ 19501 • 9 specs; REVIZEE-Central C1-VV38; IBUFRJ 19608 • 3 specs; REVIZEE-Central C1-VV38; MORG 40339 • 1 spec.; 19º26′03″ S, 39º22′35″ W; depth 44 m; Oct. 2003; MNRJ 32837 *. – Campos Basin (Espírito Santo/ Rio de Janeiro) • 3 specs; REVIZEE-Central C1-VV16; IBUFRJ 19487 • 1 spec.; REVIZEE-Central C1-VV21; IBUFRJ 19543 • 1 spec.; 20º42′ S, 40º06′ W; 27 Aug. 1979; OC. Ship Almirante Câmara leg.; IBUFRJ 19549 • 6 specs; REVIZEE-Central C1-D3; IBUFRJ 19584 • 1 spec.; HAB 13-H4; MNRJ 17945 * • 1 spec.; HAB 16-H3; MNRJ 18437 * • 2 specs; HAB 17-I3; MNRJ 18438 * • 4 specs; HAB 17-I2; MNRJ 18439 * • 1 spec.; HAB 13-I2; MNRJ 18675 * • 1 spec.; HAB 13-H3; MNRJ 18676 * • 1 spec.; HAB 11-G4; MNRJ 18681 * • 1 spec.; 23º04′ S, 40º59′ W; 17 Jul. 2004; MNRJ 18967 * • 1 spec.; Campos Basin ; May 2009; MNRJ 32395 * • 1 spec.; 23º04′ S, 40º59′ W; MNRJ 32626 * • 3 specs; 23º04′ S, 40º59′ W; depth 100 m; 17 Jul. 2004; MORG 52214 • 6 specs; 23º05′ S, 40º58′ W; depth 100 m; Jun. 2004; MNRJ 35517 * • 1 spec.; Campos Basin ; 2003; MORG 52231 . – Rio de Janeiro • 1 spec.; 24º12′20″ S, 44º16′34″ W; depth 148 m; Oct. 2008; MNRJ 32041 * • 3 specs; REVIZEE-Sul st. 6662; MNRJ 29383 *. – São Paulo • 5 specs; PADCT st. 6571; MNRJ 29381 * • 5 specs; PADCT st. 6571; MNRJ 60190 • 1 spec.; PADCT st. 6579; MNRJ 29371 * • 1 spec.; PADCT st. 6573; MNRJ 29376 * • 1 spec.; REVIZEE-Sul st. 6676; MZSP133502 • 2 specs; REVIZEE-Sul st. 6678; MNRJ 29384 * • 2 specs; PADCT st. 6577; MZSP 133493 • 1 spec.; REVIZEE-Sul st. 6669; MNRJ 29375 * • 1 worn spec.; REVIZEE-Sul st. 6669; MNRJ 60186 . – Santa Catarina • 1 worn spec.; PADCT st. 6635; MNRJ 27845 *.

UNITED STATES OF AMERICA – Florida • 1 spec.; 28º33′24″ N, 84º16′28″ W, off Saint Petersburg; 24 May 2012; G. Paulay leg.; with soft part preservation; FLMNH 450465 .

Remarks

Some shells of C. arnoldoi from Brazil reach 5.0 mm in length, which is smaller than the 6.0 mm length attained by shells from Cuba (Rolán & Fernández-Garcés 1994). The holotype, an adult shell from Bonaire, measures only 2.8 mm long (Faber & Moolenbeek 1991), similar to the 2.34 mm length of an

adult shell from Bahia ( Brazil) ( Fig. 87D ). The hypothesis of sexual dimorphism in C. arnoldoi should be investigated.

Figures

Fig. 87. Cosmotriphora arnoldoi Faber & Moolenbeek, 1991. A. MNRJ 18675*, 4.62 mm. B. MNRJ 18681*, 3.47 mm. C. MNRJ 30756*, 4.37 mm. D. MNRJ 32378*, 2.34 mm. E. MNRJ 18439*, 3.93 mm. F–H, J. Same shell as E. I. Same shell as C. K. Same shell as B. Scale bars: A–E = 1 mm; F–H = 500 µm; I–J = 100 µm; K = 50 µm.