Caecum, Fleming, 1813

Raines, Bret K., 2020, A Rosetta Stone for eastern Pacific Caecidae (Gastropoda: Caenogastropoda), Zootaxa 4827 (1), pp. 1-146 : 139-140

Caecum sp. C

Figures 125 A–E, 128I

Material examined. The following lots were examined. BCD: San Carlos Bay, Guaymas, Sonora, Mexico, 32 m, 2 sh .

Diagnosis. Teleoconch pod-like, with maximum diameter centrally. Dorsal margin convex, slightly flattened centrally. Anterior ventral margin rather flat. Surface semi-translucent white, smooth with only fine axial growth lines. Septum mucronate, well-inflated, with blunt mucro. Aperture oblique, simple without a varix.

Distribution and Habitat. Currently only represented by two specimens from San Carlos Bay, Sonora, Mexico.

Remarks. Caecum sp. C could potentially be a Mauroceras , which would make it the first and only one known within the eastern Pacific. However, additional research is required to confirm its placement.

Quick Reference Tool

Illustrated in Figs. 126–128 are typical examples of each species arranged next to their closest eastern Pacific congener (if any). The images in this section are not to scale.

Figures

FIGURE 125. Caecum sp. C. A. Profile view (BCD collection, NHMLAC). B. Profile view (BCD collection, NHMLAC). C. Ventral view (BCD collection, NHMLAC). D. Close-up of surface (BCD collection, NHMLAC). E. Operculum, exterior surface (BCD collection, NHMLAC).

FIGURE 126. A. C. adamsi (SBMNH 620157). B. C. draperi (SBMNH 637748). C. C. glabriforme (SBMNH 619695). D. C. dextroversum (LACM 1983-62.17). E. C. moorei (LACM 1972-76.22). F. C. magellanicum (LACM 1973-75.4). G. C. laeve (SBMNH 620845). H. C. parvum (LACM 1972-38.32). I. C. orcutti (LACM 1964-32.39). J. C. lightfootanum (SBMNH 637735). K. C. reversum (LACM 1977-144.14). L. C. skoglundae (LACM 1977-144.15). M. C. semilaeve (SBMNH 452519). N. C. paradoxum (SBMNH 452538). O. C. teres (LACM 1967-15.18). P. C. corrugulatum (JL collection, UF350241). Q. C. spiculum (SBMNH 637742).

FIGURE 127. A. C. crebricinctum (SBMNH 120619). B. C. superbum (LACM 1965-25.61). C. C. laqueatum (SBMNH 131113). D. C. elongatum (SBMNH 214991). E. C. californicum (LACM 1971-100.31). F. C. subaustrale (LACM 1975- 28.14). G. C. subspirale (LACM 1978-116.17). H. C. mirificum (LACM 1975-54.29). I. C. insculptum (LACM 1972-57.44). J. C. firmatum (LACM 1967-17.44). K. C. quadratum (LACM 1971-98.36). L. C. strangulatum (LACM 1965-21.72). M. C. heptagonum (LACM 1976-7.15). N. C. limnetes (LACM 1968-14.31). O. C. clathratum (LACM 1973-7.45). P. C. diminutum (SBMNH 619893). Q. C. chilense (LACM 1964-16.25).

FIGURE 128. A. C. venustum (SBMNH 619832). B. C. galapagoense (LACM 3755). C. C. semicinctum (LACM 1972-63.90). D. C. cocoense (SBMNH 619898). E. C. shaskyi (SBMNH 637733). F. C. lucidum (SBMNH 452540). G. C. sp. A (LACM 1972-52.67). H. C. sp. B (LACM 1962-22.33). I. C. sp. C (BCD collection, NHMLAC).