Aclis kanela Absalão, 2009

Souza, Leonardo Santos De, Araújo, Tarciso Almeida De & Pimenta, Alexandre Dias, 2024, Taxonomic review of Aclis Lóven, 1846 (Gastropoda, Eulimidae) from Brazil with notes on other congeners from the western Atlantic and Saint Helena, Zootaxa 5433 (4), pp. 451-499 : 462-463

Aclis kanela Absalão, 2009

Fig. 5

Aclis kanela Absalão, 2009: 138 , Fig. 2I–K : Pimenta et al. (2014: 69); Oliveira et al. (2018: 101).

Type material. Holotype (not found by Oliveira et al. 2018): IBUFRJ 18056. Paratypes ( MNRJ and IBUFRJ not found by Pimenta et al. 2014 and Oliveira et al. 2018): OP I #80; MNRJ 12852; OP II #75; IBUFRJ 18057; OP II #84; MNHN; OP I #45; IBUFRJ 18058.

Type locality. Brazil: Rio de Janeiro state: OP I sta. 75 ; 22°31′28″S, 40°03′50″W, 1050 m.

Material examined. Brazil: Rio de Janeiro state, Campos Basin : OP I sta. 44: IBUFRJ 17191 [1]; OP I sta. 49: IBUFRJ 15431 [1†]; OP I sta. 54: IBUFRJ 17107 [7]; OP I sta. 64: IBUFRJ 16108 [2]; OP I sta. 79: IBUFRJ 16897 [3]; OP I sta. 85: MNRJ 26714 [1†]; OP II sta. 44: MNRJ 26715 [2†]; OP I sta. 74: IBUFRJ 15441 [2]; OP II sta. 59: MNRJ 26713 [5†]; OP II sta. 69: IBUFRJ 15520 [8]; OP II sta. 64: IBUFRJ 19664 [1]; OP II sta. 74: IBUFRJ 17258 [3]; OP II sta. 75: IBUFRJ 19665 [2]; OP II sta. 79: IBUFRJ 16769 [10]; Albacr sta. 18: IBUFRJ 17463 [1]; 21°53′37″S, 39°50′19″W, 1120 m; 24/viii/2001: MNRJ 26731 [1†]; São Paulo state: Revizee Sul sta. 6705: MNRJ 28293 [1]; PADCT sta. 6554: MNRJ 36034 [1†].

Measurements. Holotype (IBUFRJ 18056): 5 whorls; SL= 1.90 mm; BWL= 0.98 mm; AL= 0.6 mm; SW= 0.75 mm; AW= 0.41 mm. MNRJ 28293: 7 whorls; SL= 2.98 mm; BWL= 1.40 mm; AL= 0.85 mm; SW= 1.20 mm; AW= 0.70 mm.

Remarks. Besides the holotype, Absalão (2009) designated paratypes from different sampling sites in Campos Basin; however, they were not located by Pimenta (et al. 2014) and Oliveira (et al. 2018), during the curatorial revision of the types deposited in MNRJ and IBUFRJ, respectively, and they are presumably lost. The morphological comparisons of the present study were based on the original description and illustrations. The material of A. kanela examined here consists mostly of shells collected from nearby areas of the type locality. Additionally, we also extend the geographic distribution of the species southwards to the state of São Paulo.

Aclis kanela resembles A. sarissa ( Figs 2 , 3 ) in the shape of the protoconch, aperture and by the convexity of the teleoconch whorls. Absalão (2009) distinguished these species based on the increase in the diameter of the teleoconch. According to him, A. sarissa has a “typical elongated-turreted Aclis shell profile”, with the first whorls markedly smaller than the last ones. In contrast, A. kanela would have a more regular increase in diameter. However, based on our comparison of the holotype illustration of A. kanela ( Absalão 2009: fig. 2I) with the lectotype of A. sarissa ( Fig. 2A–C, E .), the increase in diameter is very similar in both shells, and in the additional material we examined. The teleoconch surface of A. kanela has a completely smooth surface (except for microscopic spiral striae) in all specimens examined, while A. sarissa usually presents spiral keels. Even in specimens with lower keel elevation, it is possible to observe some degree of elevation ( Figs 2H , 3A, D ) in the last whorls of A. sarissa . Thus, based on the current knowledge we still consider A. kanela as a valid species, pending further comparisons with samples in better conditions of preservation.

Geographic Distribution. Brazil: Rio de Janeiro ( Absalão 2009), São Paulo (this study). From 424 m to 1941 m ( Absalão 2009; this study).

Figures

FIGURE 2. Aclis sarissa Watson, 1881. A–C, E. Lectotype, NHMUK 1887.2.9.1576, herein designated; D. Paralectotype, NHMUK 1887.2.9.1576; F–I. Paralectotype, NMW 1955.158.26255; J–K. Holotype of Aclis carolinensis, USNM 83743. A, D, F, J. Shell in frontal view; B, G, K. Shell in lateral view. C, H. Shell in dorsal view. E, I. Body whorl in frontal view. Scale bars: A–D, F–H, I–J. 1 mm; E, I. 500 μm. Credits: A–E. NHMUK photographic unit; F–I. NMW.

FIGURE 3. Aclis sarissa Watson, 1881. A–B, H–K. MORG 49199. C–D. CZUFS GAS-00102. E–G. CZUFS GAS-00104. A, C, E. Shell in frontal view; square in A indicates detail in I. B, D, F. Shell in lateral view. G–H. Detail of the body whorl in frontal view. I–J. Detail of teleoconch surface; rectangle in I indicates detail in J. K. Detail of apical whorls; arrow indicates the transition protoconch–teleoconch. Scale bars: A–F. 1 mm; G–H. 500 μm; I–J. 50 μm; K. 200 μm.

FIGURE 5. Aclis kanelaAbsalão, 2009. A, D–G. MNRJ 28293. B–C. MNRJ 26713. A–C. Shell in frontal view; rectangle in A indicates detail in E. D. Detail of body whorl in frontal view. E, F. Detail of teleoconch sculpture; rectangle in E indicates detail in F. G. Detail of apical whorls. Scale bars: A–C. 1 mm; D. 500 μm; E–F. 50 μm; G. 200 μm.