Cerithiopsis 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 : 27

Cerithiopsis hielardae Cecalupo & Perugia, 2020

( Fig. 12 )

Cerithiopsis hielardae Cecalupo & Perugia, 2020 partim: 31, pl. 14 figs. 2a–f, pl. 15, figs. 1a–i.

Type material. Holotype: MNHN – IM –2000–34838.

Type locality. Guadeloupe, Petite Terre , 15 m.

Material examined. Brazil: -- Rio Grande do Norte state: BPot sta. MR42: MNRJ 28974 [9*]; BPot sta. MR45: MNRJ 28975 [4*p]; BPot sta. MR44: MNRJ 28976 [2*p]; -- Pernambuco state: Cabo de Santo Agostinho , P. Maestrati coll., 1983–1989: MNHN [1*]; -- Bahia state: Baía de Todos os Santos , O. Falcão coll., 1997: IBUFRJ 13880 [2*], IBUFRJ 13884 [9*], IBUFRJ 14068 [6*]; -- Espírito Santo state: off Piúma , F. Pitombo coll., 1993: IBUFRJ 13885 [1*]; REVIZEE– Central sta. C1–VV38: IBUFRJ 14069 [1*]; -- Rio de Janeiro state: Geomar XII sta. 97, 22°8’S, 40°31.7ʹW, 54.9 m, Oceanographic Ship Almirante Câmara coll., 29/viii/1979: IBUFRJ 7651 [1*]; HAB 16 sta. B4: MNRJ 16561 [1*p]; HAB 16 sta. B5: MNRJ 16566 [2*p]; HAB 16 sta. G3: MNRJ 16562 [2*p]; 22°42ʹS, 40°40ʹW, 110–120 m, 19 ix/2009: MNRJ 31369 [1*].

Remarks. Cerithiopsis hielardae has a small and slender shell, in addition to a protoconch slightly similar to that of C. albovittata ( Fig. 11 ) and C. parvada , with small axial riblets below the suture and a discrete suprasutural spiral cord on some whorls of the larval shell ( Fig. 12G–H ). In both, C. albovittata and C. hielardae , the strength of the sculpture of the protoconch is quite variable. Shells of C. hielardae from Brazil ( Figs 12G–H ) present the same strength of protoconch sculpture as the holotype of C. hielardae . Cecalupo & Perugia (2020) compared this species with C. parvada , citing the more ‘rugged’ [perhaps more nodulose/coarser nodes] teleoconch of C. parvada , deeper suture, and less axial ribs. We agree with these differences, which also distinguishes C. parvada from C. albovittata ,. Moreover, the median spiral cord of the teleoconch of C. hielardae ( Fig 12E–F ) is considerably more pronounced than the adapical and abapical ones than in C. albovittata . C. hielardae is distinctly more slender (and usually smaller) than C. albovittata . One paratype of C. hielardae illustrated by Cecalupo & Perugia (2020: pl. 15, figs. 1j–l) seems much more similar to what they consider to be C. parvada .

Geographic and bathymetric distribution. Disjunct distribution, in the Tropical Northwestern Atlantic Province ( Guadeloupe) and in the Tropical Southwestern Atlantic Province (from Rio Grande do Norte to Rio de Janeiro states). Littoral to 141 m (this study).

Figures

FIGURE 11. Cerithiopsis albovittata (C. B. Adams, 1850)—species complex. A–F: shells from Rio de Janeiro state (A–C: MNRJ 15406; D–F: MNRJ 31791); G–I: shell from Bahia state (MNRJ 17381); B–C, E–F, H–I: protoconch and detail of scupture of shells in A, D, G, respectively. Lengths of whole shells: A: 4.7 mm; D: 4.8 mm; G: 3.0 mm. Scale bars: A, D, G: 1 mm; B–C, E–F, H–I: 100 µm.

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.