Caecum knysnaense, Vannozzi & Pizzini & Raines, 2015
publication ID |
https://doi.org/ 10.5733/afin.056.0109 |
publication LSID |
lsid:zoobank.org:pub:2A9621F0-009E-4A25-A093-DD322B9EC120 |
DOI |
https://doi.org/10.5281/zenodo.7662090 |
persistent identifier |
https://treatment.plazi.org/id/5BCBB839-8098-4C88-9B32-C524E84F68D0 |
taxon LSID |
lsid:zoobank.org:act:5BCBB839-8098-4C88-9B32-C524E84F68D0 |
treatment provided by |
Felipe |
scientific name |
Caecum knysnaense |
status |
sp. nov. |
Caecum knysnaense View in CoL sp. n.
Figs 5A–E View Fig , 7 View Fig , 22I View Fig , 23I View Fig , 24B View Fig , 25P View Fig
Etymology: Derived from the type locality.
Description: Tube subcylindrical, with a slight dextral torsion, evenly arched. Tube smooth, glossy, colourless, semitransparent. Aperture with a barely visible swelling, strongly oblique toward the ventral side, preceded by a white band. Surface with only fine oblique growth lines. Septum smooth, domeshaped, protruding, with an earlike mucro directed halfway between the dorsal and the right side. Macula large, with a frosted appearance, formed by two oblong bands fused in the middle. Juveniles rather similar to the adults, showing a narrower and more arched shape of the tube. Periostracum light brown. Operculum flat with a raised internal nucleus and internally thickened edge. Outer side showing a spiral of about three whorls. Larval stage unknown.
Length: 1.2–1.9 mm.
Type locality: SOUTH AFRICA: Western Cape: Knysna, Gericke Point, Sedgefield.
Holotype ( Figs 5A–C View Fig , 22I View Fig , 23I View Fig ): SOUTH AFRICA: Western Cape: lv, Knysna, Gericke Point, Sedgefield ( NMSA S7625 About NMSA /T3362), length 1.6 mm, min. diam. (posterior end) 0.31 mm, diam. in the middle of the tube 0.36 mm, max. diam. (apertural end) 0.37 mm.
Paratypes: SOUTH AFRICA: Western Cape: 1 lv and 6 sh, same data as holotype ( NMSA W9673 About NMSA /T3364) ; 2 lv and 6 sh (1 juv), Walker’s Point, W of Knysna , leg. J.P. Marais iii.1991 ( NMSA W9672 About NMSA /T3363) .
Doubtful: SOUTH AFRICA: Western Cape: 1 sh (broken), Walker’s Bay , W of Knysna, iii.1991 ( JPM) .
Comparative material examined: C. macrum van der Linden & Moolenbeek, 2000 , SENEGAL: 2 sh, Charbonnier, petite épave, - 34 m, fond sable coquiller légerement vaseux, leg. J. Pelorce ( MP); 1 sh, Somone, - 7 m, sable sur rochers plats avec curvettes sable, leg. J. Pelorce ( MP).
Distribution: Known with certainty only from Knysna ( Fig. 7 View Fig ).
Remarks:This species clearly resembles Caecum austrafricanum sp. n. However, there are some consistent differences that set specimens of this species apart from the hundreds of C. austrafricanum specimens found in the same sites. In fact, C. knysnaense sp. n. is smaller and shows an aperture which is more oblique by ca. 10° and lacks a clear swelling. Additionally, the septum of C. knysnaense is convex while in C. austrafricanum it is typically flat or Sshaped.Also the mucro and the general aspect of the tube are different. Caecum knysnaense also strongly resembles C. macrum van der Linden & Moolenbeek, 2000 ( Fig. 25R View Fig ), from which it can be distinguished by the different shape of the mucro and by the more oblique aperture. Also the macula is different, being shorter and heartshaped in C. macrum ( Fig. 24B, H View Fig ).
NMSA |
KwaZulu-Natal Museum |
MP |
Mohonk Preserve, Inc. |
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.
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