Cerithiopsis perigaudae 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 : 32

Cerithiopsis perigaudae Cecalupo & Perugia, 2020

( Fig. 15A–C )

Cerithiopsis perigaudae Cecalupo & Perugia, 2020: 42 , pl. 20, figs. 3a–c.

Type material. Holotype: MNHN – IM 2000–34587 .

Type locality. Martinique .

Material examined. Brazil, -- Sergipe state: 10°45ʹ36”S, 36°36ʹ08”W, 20 m depth: CZUFS GAS-00095 [1].

Material examined of Cerithiopsis cf. perigaudae . off Rio de Janeiro state, 22°42ʹS, 40°40ʹW, 110 m, 2006: MNRJ 15407 [*p]

Remarks. The present record is based on a single shell from northeast Brazil that presents overall teleoconch size, shape and sculpture ( Fig 15A–B ), as well as the typical protoconch sculpture ( Fig 15C ), of the holotype of C. perigaudae (high-resolution image of the holotype available in the MNHN molluscs collection dataset - https:// www.gbif.org/occurrence/2860642306). This species is distinguished by its spiral cord with granular protuberances on the larval shell, combined with the brown teleoconch, which has three equal spiral cords.

A second shell, herein treated as Cerithiopsis cf. perigaudae ( Fig. 15D–G ), from southeast Brazil is also similar, but it is considerably larger (3.1 mm vs. 1.7 mm in the shell from NE Brazil, the species reaches 2.8 mm in the Caribbean). The protoconch of the shell from SE Brazil has a row of axially elongated granules arranged side by side in the suture ( Fig. 15F–G ). In the holotype of C. perigaudae these granules seem interleaved, i.e., granules are arranged at alternating height.

Cerithiopsis pennecae Cecalupo & Perugia 2020 closely resembles C. perigaudae , but is smaller and has a less impressed suture. as was noted by these authors. However, examination of the high-resolution image of the holotype of C. pennacae (https://www.gbif.org/occurrence/2860642301) reveals that the spiral cord of the protoconch is not granulated but continuous and smooth. Evaluation of possible intraspecific variation demands examination of additional shells.

Geographic and bathymetric distribution. Disjunct distribution, in the Tropical Northwestern Atlantic Province (Eastern Caribbean ecoregion) and the Tropical Southwestern Atlantic Province (Northeastern Brazil ecoregion). From 11 m ( Cecalupo & Perugia 2020) to 20 m (this study).

Figures

FIGURE 15A–C. Cerithiopsis perigaudae Cecalupo & Perugia, 2020. Shell from Sergipe state (CZUFS GAS-00095). C: protoconch. FIGURE 15D–G. Cerithiopsis cf. perigaudae. Shell from Rio de Janeiro state (MNRJ 15407). E: body whorl; F: protoconch; G: detail of protoconch. Lengths of whole shells: A–B: 1.7 mm; D: 3.1 mm. Scale bars: A–B, D: 1 mm; C, F–G: 100 µm; E: 200 µm.