Cerithiopsis cf. hielardae Cecalupo & Perugia, 2020

Pimenta, Alexandre Dias, Faria, Raquel Garofalo De Souza, Figueira, Raquel Medeiros Andrade & Fernandes, Maurício Romulo, 2024, Unraveling another of the ‘ Big Fiveʹ: new species and records of Cerithiopsidae from Brazil (Caenogastropoda: Triphoroidea), Zootaxa 5494 (1), pp. 1-71 : 28-30

Cerithiopsis cf. hielardae Cecalupo & Perugia, 2020

( Fig. 13 )

Cerithiopsis sp. 1 : Lamy & Pointier (2017: 290, pl. 93 figs. 5a–b).

Cerithiopsis albovittata : Cecalupo & Perugia (2020 partim: 21, pl. 7 figs. 1g –o, pl. 8 figs. 1a–o, pl. 9 figs. 1d–l).

Material examined. Brazil: -- Pernambuco state: Cabo de Santo Agostinho , P. Maestrati coll., 1984–1989: MNHN [1*]; -- Bahia state: Baía de Todos os Santos, O. Falcão coll., 1997: IBUFRJ 10852 [1*], IBUFRJ 13881 [2*], IBUFRJ 13883 [1*], IBUFRJ 18302 [1*], IBUFRJ 14145 [17*], IBUFRJ 20655 [9*], IBUFRJ 21047 [6*]; MNRJ 15390 [4]; -- Espírito Santo state: REVIZEE– Central sta. C1–VV38: IBUFRJ 14141 [1*p]; off Serra, 20°14ʹS, 40°12ʹW, 2 m, vi/2008: MNRJ 34983 [7]; Piúma, F. Pitombo coll., 1993: IBUFRJ 8725 [3*]; -- Rio de Janeiro state: HAB 11 sta. B5: MNRJ 16290 [1]; 22°42ʹS, 40°40ʹW, 110–120 m, 19/ix/2009: MNRJ 33390 [1*]; 23°04ʹS, 40°59ʹW, 17/xii/2004: MNRJ 33013 [5]; 23°08ʹS, 41°02ʹW, x/2008: MNRJ 32225 [2*p].

Remarks. Shared features between Cerithiopsis cf. hielardae ( Fig. 13 ) and C. hielardae ( Fig. 12 ) include the variable expression of nodules on the spiral cords, the same shell color pattern and the same protoconch sculpture. They differ only in general shell shape and size. Cerithiopsis cf. hielardae has an elongate, conical shell, with many whorls ( Fig. 13A ), whereas C. hielardae is smaller and has a subcylindrical shell ( Fig. 12A–B ). Considering that such variation in shell size and shape is also considered to occur in C. albovittata , we refrain from naming C. cf. hielardae as a new species but keep it in a separate account. Only the analysis of additional material (with soft parts) may elucidate this question.

Cecalupo & Perugia (2020: pl. 7, figs. 1g –o, pl. 8, figs. 1a–o, pl. 9, figs. 1d–l) illustrated some shells from Guadeloupe and Martinique very similar to C. cf. hielardae , with the typical weak axial sculpture on the teleoconch, but named C. albovittata . They did not consider the resemblance between such shells and C. hielardae .

Lamy & Pointier (2017) figured a shell named Cerithiopsis sp. 1 from Martinique, which fits perfectly with the shell morphology of C. cf. hielardae ; it was considered rare in their survey.

Geographic and bathymetric distribution. Tropical Northwestern Atlantic Province ( Martinique and Guadeloupe) and Tropical Southwestern Atlantic Province (from Pernambuco to Rio de Janeiro states). Littoral to 157 m.

Figures

FIGURE 12. Cerithiopsis hielardae Cecalupo & Perugia, 2020. A–B, E–F: shells from Rio de Janeiro state (A: IBUFRJ 7651; B: MNRJ 16561; F: MNRJ 16562); C–E, G–H: shells from Maranhão state (MNRJ 28976); E: detail of teleoconch sculpture of shell in D; F: body whorl; G–H: protoconchs of shells in C and D, respectively. Lengths of whole shells:A: 3.3 mm; B: 2.9 mm; C: 2.4 mm; D: 1.8 mm. Scale bars: A–D: 1 mm; E–H: 200 μm.

FIGURE 13. Cerithiopsis cf. hielardae Cecalupo & Perugia, 2020. A–B, D–E, G–H: shells from Rio de Janeiro state (A: MNRJ 16290; B, D–E: MNRJ 32225; G–H: MNRJ 33013); C, F: shell from Espírito Santo state (IBUFRJ 14141); D–E: detail of teleoconch sculpture and body whorl of shell in B; F: body whorl of shell in C; G–H: protoconch an detail of protoconch sculpture. Lengths of whole shells: A: 5.4 mm; B: 4.1 mm; C: 3.1 mm. Scale bars: A–C: 1 mm; D–F: 200 μm; G–H: 100 μm.