Cerithiopsis sp. 1

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 : 30-32

Cerithiopsis sp. 1

( Fig. 14F–N )

Material examined. Brazil: -- Pernambuco state: Praia do Pina, Recife, P. Maestrati coll.: MNHN [1*]; Cabo de Santo Agostinho , 2 m, P. Maestrati coll.: MNHN [1*]; Fernando de Noronha Archipelago , L. R . Simone & P. J. S de Souza coll., 20/vii/1999: MZSP 31997 [2]; -- Bahia state: Baía de Todos os Santos, 12°58ʹS, 38°35ʹW, 20 m, O. Falcão coll., 1997: MNRJ 28834 [5*], IBUFRJ 18766 [3], IBUFRJ 20653 [16]; -- Espírito Santo state: HAB 13 sta. I2: MNRJ 16251 [1*]; Piúma, F. Pitombo coll., 1993: IBUFRJ 8626 [38]; REVIZEE– Central sta. C1–C64: IBUFRJ 13055 [2]; REVIZEE– Central sta. C6–Y7: IBUFRJ 15818 [1], IBUFRJ 19627 [1]; -- Rio de Janeiro state: HAB 13 sta. H2: MNRJ 16221 [2*p]; HAB 13 sta. H1: MNRJ 16222 [1*]; HAB 16 sta. G3: MNRJ 17383 [1*p].

Remarks. Cerithiopsis sp. 1 shares features with some species described from the Caribbean (Rolán et al.

2007), such as Cerithiopsis iuxtafuniculata Rolán, Espinosa & Fernández-Garcés, 2007 , Cerithiopsis familiarum Rolán, Espinosa & Fernández-Garcés, 2007 , Cerithiopsis cruzana Nowell-Usticke, 1959 and Cerithiopsis dilata Rolán, Espinosa & Fernández-Garcés, 2007 , all of them with brown bands usually on the adapical spiral cord of the teleoconch and subperipheral cord, like those found in Cerithiopsis sp. 1 ( Fig. 14F–J ). The protoconch of Cerithiopsis sp. 1 is certainly much similar to that of C. iuxtafuniculata , with a thin spiral cord close to the suture and minute axial marks ( Fig. 14M–N ). However, the equidistant spiral cords in the teleoconch of Cerithiopsis sp. 1 , mainly in late whorls ( Fig. 14L ), resemble those of C. cruzana and C. dilata , because in C. iuxtafuniculata the adapical spiral cord is much closer to the median one until the body whorl. Both C. cruzana and C. dilata reach considerably higher shell lengths (3.7–3.8 mm; Rolán et al. 2007) than Cerithiopsis sp. 1 (up to 2.2 mm).

Two species from Guadeloupe and Martinique also show similar teleoconch sculpture, color, and protoconch with nearly identical sculpture and number of whorls as in Cerithiopsis sp. 1 : Cerithiopsis michellegalli Cecalupo & Perugia, 2020 and Cerithiopsis michezae Cecalupo & Perugia, 2020 . Both species were not compared to each other by Cecalupo & Perugia (2020). From the illustrated shells it appears that the adapical spiral cord of the teleoconch only becomes fully distant from the median one in the third whorl in C. michellegalli vs. sixth whorl in C. michezae (and fourth/fifth whorl in Cerithiopsis sp. 1 ). Cerithiopsis sp. 1 (up to 2.2 mm long) shares with C. michellegalli (up to 2.1 mm long) the small shell size; C. michezae is slightly larger (up to 3.3 mm long). The maximum number of teleoconch whorls (up to 6.5) is considerably higher in Cerithiopsis sp. 1 than in C. michellegalli (up to 4.5) and slightly lower than in C. michezae (up to 7.5).

Considering the existence of all these similar Caribbean species and that no one is exactly identical with the shell features shown by Cerithiopsis sp. 1 , in addition to the absence of available soft parts to be studied, it is preferable to avoid the establishment of a new name or a new record until proper material is obtained.

Geographic and bathymetric distribution. Tropical Southwestern Atlantic Province, from Pernambuco to Rio de Janeiro states, including the Fernando de Noronha Archipelago. Littoral to 76 m.

Figures

FIGURE 14 A–E. Cerithiopsis beneitoi Rolán, Espinosa & Fernández-Garcés, 2007. Shell from Rio de Janeiro state (MNRJ 16572); C–E: body whorl, protoconch and detail of protoconch sculpture of shell in A/B. FIGURE 14 F–N. Cerithiopsis sp. 1. F: shell from Espírito Santo state (IBUFRJ 15818); G, K–N. Shells from Rio de Janeiro state (MNRJ 16221); H: shell from Fernando de Noronha Archipelago (MZSP 31997); I–J: shells from Bahia state (I: IBUFRJ 20653; J: IBUFRJ 18766); L–N: body whorl, protoconch and detail of protoconch sculpture of shell in K. Lengths of whole shells:A–B: 2.0 mm; F: 2.2 mm; G: 2.2 mm; H: 2.1 mm; I: 1.9 mm; J: 2.5 mm; K: 2.1 mm. Scale bars: A–B, F–K: 1 mm; C, L: 200 μm; D, M–N: 100 μm; E: 50 μm. Horizontal bar indicates the same shell.