Habeastrum decussatum Hausdorf & Tapia 2026, sp. nov.

Le résumé fourni par la source

Habeastrum decussatum Hausdorf & Tapia sp. nov. Fig. 1 M – R, Tables 1, 2 Type material. Holotype: Ecuador, Sucumbios province: • Lumbaqui, via la Troncal km 12, sector Dumbique, Dashino River, in leaf litter at base of non-calcareous rocky wall in a small river cliff, 0.0364°S, 77.2997°W, 500 m a. s. l., 22. 07. 2025, E. Tapia & A. Guasti leg., QCAZI 282661. Paratypes: • same data as holotype: QCAZI 282662 / 1; ZMH -MOL-165491 / 2. Diagnosis. Shell minute (1.3 mm high), corneous-brown, wide, elongated conical, with 4.5 strongly convex whorls, protoconch (2 whorls) with dense, irregular indentations, teleoconch with fine ribs (24–25 ribs / 0.5 mm) crossed by spiral lines, and a narrow umbilicus taking 8–10 % of the shell diameter. Description. Shell elongated conical; 4.5 strongly convex whorls; protoconch (c. 2 whorls) with dense, irregular indentations; teleoconch finely ribbed (24–25 ribs / 0.5 mm on ventral side of body whorl) crossed by distinct spiral lines; corneous-brown; aperture circular, prosocline; peristome continuous, attached to body whorl, not expanded, not reflexed and hardly thickened on the inside; umbilicus open, narrow, taking 8–10 % of shell diameter. Measurements see Table 2. Etymology. Named after the decussate sculpture consisting of fine radial ribs crossed by spiral lines (Latin decussatus, marked with lines intersecting cross-wise, used as an adjective). Distribution. Habeastrum decussatum sp. nov. is only known from piedmont evergreen forest in the north of the Eastern Cordillera in Sucumbios province in Ecuador at 500 m a. s. l. Remarks. Habeastrum decussatum sp. nov. differs from all other Habeastrum species in the wide conical shell with fine radial ribs crossed by distinct spiral lines on the teleoconch, and distinct irregular indentations on the protoconch (Table 2).

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