Zadelsdorfia zana sp. nov.

urn:lsid:zoobank.org:act: 8ABDDAC1-F889-4E3B-8F43-00DCB44E17CA

Tables 81–82

Gattendorfia crassa – Bockwinkel & Ebbighausen 2006: 109, text-figs 26, 27g –j.

Diagnosis

Species of Zadelsdorfia with a thickly discoidal, very evolute conch at 5 mm dm (ww/dm ~0.50; uw/ dm ~0.62); conch at 15 mm dm thinly pachyconic, subevolute (ww/dm ~0.65; uw/dm ~0.35). Whorl profile in the juvenile stage crescent-shaped, at 20 mm dm weakly depressed (ww/wh ~1.45); coiling rate moderately high (WER ~1.85). Venter broadly rounded throughout ontogeny, umbilical margin narrowly rounded in the adult stage. Weak constrictions with concavo-convex course. Suture line with lanceolate, weakly pouched external lobe and lanceolate adventive lobe.

Etymology

Acronym for a Zadelsdorfia species from North Africa.

Material examined

Holotype

MOROCCO • Anti-Atlas, Mfis near Taouz, bed 7; Becker Coll.; illustrated byBockwinkel & Ebbighausen (2006: text-fig. 27g –h); MB.C.3832.2.

Paratypes

MOROCCO • 7 specimens; Anti-Atlas, Mfis near Taouz, bed 7; Bockwinkel & Ebbighausen Coll.; MB.C.3832.1, MB.C.3832.3 –8 .

Description

The species newly described here has been worked on in detail by Bockwinkel & Ebbighausen (2006), so reference can be made here to that description.

Remarks

Zadelsdorfia zana sp. nov. resembles Z. crassa, but the ontogenetic transition from the initial serpenticonic stage to the more involute subadult stage occurs at a smaller diameter of the conch (uw/ dm ~0.25 at 20 mm dm) compared to Z. crassa (uw/dm = 0.35–0.45 at 20 mm dm). In addition, G. zana has constrictions, which are straight on the flank, whereas in Z. crassa they are directed backwards.