Caecum iricolor, Vannozzi, 2023
publication ID |
https://doi.org/ 10.5252/zoosystema2023v45a12 |
publication LSID |
lsid:zoobank.org:pub:5EB87A24-068B-40F3-B76B-79E4F48C478A |
DOI |
https://doi.org/10.5281/zenodo.8183526 |
persistent identifier |
https://treatment.plazi.org/id/4FFA7AA6-0863-48AB-ACF1-451AD99D0347 |
taxon LSID |
lsid:zoobank.org:act:4FFA7AA6-0863-48AB-ACF1-451AD99D0347 |
treatment provided by |
Felipe |
scientific name |
Caecum iricolor |
status |
sp. nov. |
Caecum iricolor View in CoL n. sp.
( Figs 2 View FIG E-H; 4 View FIG A, B; 5 View FIG A, B)
urn:lsid:zoobank.org:act:4FFA7AA6-0863-48AB-ACF1-451AD99D0347
TYPE MATERIAL. — Holotype. Mayotte • dd (length 2.33 mm, Figs 2 View FIG E-F, 4A and 5A); Mozambique Channel , W Mayotte, BIOMAGLO Stn DW4854; 12°56’S, 44°58’E; 455-465 m depth; 4.II.2017; MNHN-IM-2000-38696 . GoogleMaps
Paratypes. Mayotte • 1 dd; same data as for holotype; MNHN-IM-2000-38697 GoogleMaps • 3 dd; Mozambique Channel , NW Mayotte, BIOMAGLO Stn DW4860; 12°31’S, 44°55’E; 486-646 m depth; 5.II.2017; MNHN-IM-2000-38699 GoogleMaps .
TYPE LOCALITY. — Indian Ocean , Mozambique Channel, W Mayotte, 12°56’S, 44°58’E, 455-465 m depth.
OTHER MATERIAL EXAMINED. — Îles Éparses • 1 dd; Mozambique Channel, Banc du Geyser, BIOMAGLO Stn DW 4789; 12°22’S, 46°25’E; 340-342 m depth; 22.I.2017; MNHN. GoogleMaps
Mayotte • 1 dd (fragm); Mozambique Channel, NW Mayotte, BIOMAGLO Stn DW 4860; 12°31’S, 44°55’E; 486-646 m depth; 5.II.2017; MNHN GoogleMaps • 2 dd; Mozambique Channel, S Mayotte, BIOMAGLO Stn DW 4826; 13°05’S, 45°07’E; 489-496 m depth; 27.I.2017; MNHN GoogleMaps • 1 dd (fragm); Mozambique Channel, NE Mayotte, BIOMAGLO Stn DW 4871; 12°44’S, 45°19’E; 462-486 m depth; 8.II.2017; MNHN GoogleMaps .
DISTRIBUTION. — Known only from Mayotte and Banc du Geyser.
ETYMOLOGY. — Derived from Latin adjective iricolor due to the iridescent appearance of the surface.
DESCRIPTION
Shell of average size for the genus, tubular, smooth, colourless, semitransparent, iridescent.Tube cylindrical, gradually tapering toward the apex. In ventral view, tube appearing slightly dextrally twisted. Surface covered by fine growth lines, sometimes showing shallow wavy longitudinal grooves. Macula absent. Aperture somewhat inclined, preceded by a distinct swelling forming a rounded varix crossed by growth lines, then contracting and ending with a clearly reflected lip. Septum dome shaped without mucro, lying on the cutting plane. Traces of temporary septum visible at the boundary of the septum with the tube. No traces of periostracum detected. Young stages, protoconch, operculum and soft parts unknown. Holotype: length 2.33 mm, max diam 0.44 mm, min diam 0.33 mm.
REMARKS
Caecum iricolor n. sp. is very similar to C. biomaglo n. sp. and may at first sight be confused with it. However, C. iricolor n. sp. is more fragile and is easily distinguished due to the more slender shape of the tube, slightly twisted and more gradually tapering toward the apex, the smaller and more protruding septum and the more gently rounded swelling and more clearly reflected lip. Furthermore, C. biomaglo n. sp. shows a fine longitudinal microsculpture ( Fig. 4 View FIG ), while C. iricolor n. sp. has no true microsculpture apart from growth lines and only longitudinal shallow wavy grooves occasionally occur.
Caecum iricolor n. sp. is also similar to C. succineum , which however is much smaller and shows several distinct rings in the abapical portion of the tube.
Iridescence of the tube is not unique to C. iricolor n. sp. and occurs in several other species of Caecum , all sharing a smooth and colourless tube, e.g., C. glabrum (Montagu, 1803) , C. subannulatum de Folin, 1870 , C. subcylindratum Pizzini, Raines & Vannozzi, 2013 , C. maraisi Vannozzi, Pizzini & Raines, 2015 and C. biomaglo n. sp.
MNHN |
Museum National d'Histoire Naturelle |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Kingdom |
|
Phylum |
|
Class |
|
Order |
|
Family |
|
SubFamily |
Caecinae |
Genus |