Caecum adamsi

Raines, Bret K., 2020, A Rosetta Stone for eastern Pacific Caecidae (Gastropoda: Caenogastropoda), Zootaxa 4827 (1), pp. 1-146 : 124-125

publication ID

https://doi.org/ 10.11646/zootaxa.4827.1.1

publication LSID

lsid:zoobank.org:pub:2CE528C2-DE07-4155-B37D-BE2C342A3901

DOI

https://doi.org/10.5281/zenodo.4457836

persistent identifier

https://treatment.plazi.org/id/03A3DF49-FF99-FFFC-FF44-FCC8FE6838E2

treatment provided by

Plazi

scientific name

Caecum adamsi
status

 

Caecum adamsi nomen novum

Figures 105 View FIGURE 105 A–G, 106A–F, 107A–B, 126A

Elephantanellum carpenteri Bartsch, 1920: 567 View in CoL , holotype USNM 340727, San Diego, California. [non Deshayes, 1861 †]. Elephantanellum carpenteri View in CoL — Keen, 1971: 398.

Caecum (Elephantulum) carpenteri View in CoL —Abbott, 1974: 92, fig. 882.

Elephantulum carpenteri — Skoglund, 1992: 29.

non Brochina carpenteri — Lightfoot, 1993b: 82, fig. 30.

Caecum carpenteri View in CoL — Raines, 2019: 101, fig. 3C.

Material examined. In addition to the type material the following lots were examined. SBMNH: SBMNH 115808 About SBMNH , Bahia La Choya , Sonora, Mexico, intertidal, 1 sh ; SBMNH 620157 About SBMNH , Puerto San Carlos , Bahia Magdalena, Baja California Sur, Mexico, 2–10 m, 15 sh; SBMNH 621392 About SBMNH , Estero Morua , Sonora, Mexico, intertidal, 4 sh ; SBMNH 622342 About SBMNH , Punta Tormenta , Sonora, Mexico, intertidal, 1 sh .

Original diagnosis. “This is a large thin shell, in which the segments of all stages are marked by very fine spiral sculpture and a little stronger incremental lines, while the last portion of these stages bears well developed annuli. These increase in number in succeeding stages.” Bartsch (1920: 567).

Description. Protoconch and teleoconchs I, II, III unknown. Teleoconch IV smooth with weak axial growth lines, axial rings developing near aperture ( Fig. 106A, C View FIGURE 106 ), transition to teleoconch V marked by suture ( Fig. 107A View FIGURE 107 ). Teleoconch V sculptured with weak axial growth lines and weak, longitudinal striae ( Figs. 106B, D View FIGURE 106 ), transition to teleoconch VI marked by suture ( Fig. 107A View FIGURE 107 ). Teleoconch VI (last growth stage) large for genus [Tol 4.57–4.80 mm], tubular, thin, fragile, moderately to strongly and regularly arched [Larc: 2.12–2.18 mm; Arc: 0.40–0.41 mm], subcylindrical, semi-translucent white ( Figs. 105 View FIGURE 105 A–B). Surface sculptured with longitudinal striae crossed by axial threads, which become raised annuli toward apertural end ( Figs. 106 View FIGURE 106 E–F). Posterior [Dpe: 0.76–0.80 mm] with rather thin edge, squared shoulder ( Fig. 105D View FIGURE 105 ). Septum slightly inflated ( Fig. 105G View FIGURE 105 ). Mucro not visible. Aperture [Da: 0.80–0.85 mm] thin ( Fig. 105D View FIGURE 105 ). No varix. Lip smooth ( Fig. 105D View FIGURE 105 ). Periostracum thin, smooth, yellowish ( Fig. 105A View FIGURE 105 ). Operculum thin, light brown; exterior surface with 7–9 concentric rings ( Fig. 105E View FIGURE 105 ). Conceptual reconstruction of growth stages shown in Fig. 107A View FIGURE 107 .

Etymology. The replacement name honors Charles B. Adams, who described the first caecids from the eastern Pacific region.

Distribution and Habitat. From Santa Monica, Los Angeles County, California south to the Gulf of California, Mexico. Intertidal to 18 m. Uncommon to rare on sandy substrates.

Remarks. Caecum carpenteri ( Bartsch, 1920) described in the original combination of Elephantulum carpenteri Bartsch, 1920 is a secondary homonym of, and preoccupied by Caecum carpenteri Deshayes, 1861 †. As there are no known synonyms of Bartsch’s species, Caecum adamsi nomen novum is here introduced for Caecum carpenteri ( Bartsch, 1920) .

Caecum adamsi is quite fragile and for many years had only been known from its holotype (USNM 340727, Fig. 105G View FIGURE 105 ). It also has a more restricted range than had been suggested by both Keen (1971) and Lightfoot (1993b). Lastly, it should be noted there is an error in Bartsch’s original type number. The catalog number for the holotype is USNM 340727, not 340726. The latter number is for the holotype of Caecum diegense Bartsch, 1920 , which has been missing since the 1960s.

SBMNH

Santa Barbara Museum of Natural History

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Caecidae

Genus

Caecum

Loc

Caecum adamsi

Raines, Bret K. 2020
2020
Loc

Caecum carpenteri

Raines, B. K. 2019: 101
2019
Loc

Brochina carpenteri

Lightfoot, J. 1993: 82
1993
Loc

Elephantulum carpenteri

Skoglund, C. 1992: 29
1992
Loc

Elephantanellum carpenteri

Keen, A. M. 1971: 398
Bartsch, P. 1920: 567
1920
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