Caecum cf. teres Carpenter, 1857

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 cf. teres Carpenter, 1857

Caecum teres Carpenter, 1857: 329, pl. 37, figs 378, 1550. Type locality: Mazatlán [Mexico].

Material examined.

Panama • 1 juv.; Achotines; 7.6349, -79.9968; depth 10 m; 6 Mar 2016; USNM Achotines 2016 exped.; Stat. PA23a; DNA voucher; GenBank: MT727070, MT704289, MT731724; USNM 1618865. • 1 juv. (Fig. 7L ); same collection data as for preceding; DNA voucher; DNA bank: r462p7f2t91; GenBank: MT704284, MT731718; ZSM-Mol-20200033. • 1 juv.; same collection data as for preceding; DNA voucher; DNA bank: r462p11f2t91; GenBank: MT704286, MT731720; ZSM-Mol-20200037. • 1 juv. (Fig. 7M, N, Q, S ); same collection data as for preceding; ZSM-Mol-20200032. • 1 juv.; Achotines; 7.6207, -80.0013; depth 12 m; 29 Feb 2016; USNM Achotines2016 exped.; Stat. PA14; ZSM-Mol-20200027.

Shell morphology.

Thin, fragile shell. Color whitish translucent. Length varies from 1.2 to 1.5 mm. Tube elongated, uniformly cylindrical, narrowing towards posterior (Fig. 7M, N ). Septum clearly set off from edge of tube with large, triangular mucro with rounded tip (Fig. 7Q ). Aperture round with sharp and thin rim. Sculpture appears smooth using light microscopy except for numerous fine horizontal growth lines. Microsculpture composed of numerous narrow longitudinal stripes consisting of serial fine indentations (Fig. 7S ). Stripes of indentations are slightly shifted, when intersecting a growth line.

Remarks.

Our material from Pacific Panama closely resembles Caecum teres (lectotype, NHMUK catalog number 1857.6.4.1550). However, all investigated specimens are juveniles in different growth-stages and identification remains therefore to be confirmed when adult specimens are available for molecular analyses.

Figures

Figure 7. A-F Caecum pulchellum A, C, E, F specimen ZSM-Mol- 20090485 B, D juvenile specimen ZSM-Mol- 20200118 A, B light microscopic pictures C, D SEM scans E close-up of mucro and F microsculpture H-K C. donmoorei, specimen USNM 1618844 H-K C. regulare, specimen ZSM-Mol- 20100321, juvenile H light microscopic picture I SEM scans J close-up of mucro and K microsculpture L-T C. cf. teres and C. cf. strangulatum L specimen ZSM-Mol- 20200033, juvenile specimen with larval shell still attached M, N, Q, S specimen ZSM-Mol- 20200032, juvenile M light microscopic picture N SEM scan Q close-up of mucro and S microsculpture O, P, R, T C. cf. strangulatum, specimen ZSM-Mol- 20200038, juvenile O light microscopic picture P SEM scan R close-up of mucro and T microsculpture U-X C. cf. semilaeve, specimen ZSM-Mol- 20200034 U Light microscopic picture V SEM scan W close-up of mucro and X microsculpture. Scale bars: 10 µm (F, S, T, W, X); 20 µm (J, K, Q, R); 50 µm (E); 100 µm (H, I, L-P, U, V); 200 µm (A-D).