Caecum imbricatum Carpenter, 1858

Egger, Christina, Neusser, Timea P., Norenburg, Jon, Leasi, Francesca, Buge, Barbara, Vannozzi, Angelo, Cunha, Regina L., Cox, Cymon J. & Joerger, Katharina M., 2020, Uncovering the shell game with barcodes: diversity of meiofaunal Caecidae snails (Truncatelloidea, Caenogastropoda) from Central America, ZooKeys 968, pp. 1-42 : 1

Caecum imbricatum Carpenter, 1858

Caecum imbricatum Carpenter, 1858: 422, pl. 69, fig. 10. Type locality: "W. Indies [Carribean].

Caecum coronatum de Folin, 1867: 50-52, pl. 2, fig. 5; Caecum formulosum de Folin, 1869: 24-125, pl. 11, figs 9, 10 (with three varieties paucicostata, simplex and sulcate); Caecum insigne de Folin, 1867: 52, 53, pl. 2, fig. 4; Caecum sculptum de Folin, 1881: 15, pl. I, figs 1, 2.

Material examined.

Belize • 1 (Fig. 1 , specimen to the left); Carrie Bow Cay; 16.8037, -88.0769; depth 31 m; 15 Jan 2010; USNM Belize2010 exped.; DNA voucher; GenBank: MT727051, MT704281; USNM 1618850. Panama • 1; Bocas del Toro; 9.4333, -82.3467; depth 3 m; 5 Jun 2010; USNM BRS2010 exped.; DNA voucher; GenBank: MT704261; USNM 1618852. • 1; Bocas del Toro; 9.3222, -82.2215; depth 4.5 m; 5 Jun 2010; USNM BRS2010 exped.; DNA voucher; GenBank: MT727047; USNM 1618854. • 1; same collection data as for preceding; GenBank: MT727048; USNM 1618855.

Shell morphology.

Shell opaque, yellowish. Lighter color in interspaces, darker colored ridges of prominent rhombic pattern (Fig. 1 , first specimen from left). Tube evenly narrows towards posterior end, which is approximately half as wide in diameter as aperture. Septum flat, triangular shaped, strongly pointed mucro (Fig. 1 , first specimen from left). Rhombic pattern consisting of distinct longitudinal ridges crossed by axial ridges, pattern more distinct towards aperture, last row forms bumps at intersections ((Fig. 1 , specimen to the left).

Remarks.

See remarks on C. cooperi . " after paragraph on shell morphology of C. imbricatum .

Figures

Figure 1. Morphology of Caecum (Caecidae) including important shell features used for morphological species identification. USNM 1618850 Caecum imbricatum - specimens to the left. Abbreviations: a, aperture; cgs, ciliated gliding sole; eg, egg; ey, eye; fp, fecal pellets; hf, retracted head and foot; mu, mucro; op, operculum; se, septum; st, shell structure (ornamentation); t, tentacle; tb, tube. Scale bar: 500 µm.