Dadagulella delta, Rowson & Tattersfield, 2013

Rowson, Ben & Tattersfield, Peter, 2013, Revision of Dadagulella gen. nov., the “ Gulella radius group ” (Gastropoda: Streptaxidae) of the eastern Afrotropics, including six new species and three new subspecies, European Journal of Taxonomy 37, pp. 1-46 : 24-25

publication ID	https://doi.org/ 10.5852/ejt.2013.37
publication LSID	lsid:zoobank.org:pub:ADF6394E-77B5-4309-87FE-4097FDE0A3FD
DOI	https://doi.org/10.5281/zenodo.3815749
persistent identifier	https://treatment.plazi.org/id/BF3B1698-C8EF-4B28-89A8-D1AA85773A42
taxon LSID	lsid:zoobank.org:act:BF3B1698-C8EF-4B28-89A8-D1AA85773A42
treatment provided by	Carolina
scientific name	Dadagulella delta
status	sp. nov.

Treatment

Dadagulella delta View in CoL sp. nov.

urn:lsid:zoobank.org:act:BF3B1698-C8EF-4B28-89A8-D1AA85773A42

Figs 35 View Figs 27-35 , 72, 76 View Figs 69-76 , 81 View Figs 77-83 , 84 View Fig ; Table 1 View Table 1

“ Gulella View in CoL sp. 12” – Tattersfield et al. 2006: 52-53.

Etymology

From Greek ‘ delta ’, after the letter we originally used as an informal morphospecies name for the species; used as a noun in apposition.

Type material examined

TANZANIA: holotype NMW.Z.2003.001.00019 : 1 ad., Mt. Mwanihana Forest Reserve (7.82°S, 36.83°E), Udzungwa Mts National Park , Kilombero District , forest at 1050 m alt., leg. BR, PT, MBS & CFN, 29 Jan. 2003 GoogleMaps . Paratype NMW. Z.2003.001.00020: 1 ad., data as holotype but 1200 m alt., 30 Jan. 2003.

Other material examined

None.

Description

SHELL ( Fig 32 View Figs 27-35 ). Large (4.20 - 4.30 mm high x 2.10 - 2.40 mm wide), of 6.5 whorls. Ovate-acuminate, spire broadly acuminate (spire angle 56 - 66°). Apex pointed. Embryonic whorls smoothly granulate. Later whorls with coarse, sinuous ribs (12-13 per mm on penultimate whorl). Sutures of intermediate depth. Umbilicus narrowly open. Peristome incomplete parietally. Outer palatal surface of aperture with a depression corresponding to the palatal tooth. Dentition weak, 3-fold (although could be interpreted as 2-fold or 4-fold), consisting of: one lamella-like parietal tooth; one weak palatal tooth, not forming a parieto-palatal sinus; a columellar baffle so deeply set as to be almost invisible in apertural view; and a very weak shallow columellar swelling. Juvenile shells unknown.

CEPHALOPODIUM. Pale cream, with pale tentacle retractors.

SALIVARY GLANDS ( Fig. 72 View Figs 69-76 ). United, soft, not tumid, elongate, bilobed; each duct leaving at the whitened apex of the lobe and evenly thick throughout.

RADULA. Not successfully prepared.

GENITALIA ( Figs 76 View Figs 69-76 , 81 View Figs 77-83 ). Vas deferens appearing thickened prior to insertion on penis but actually with an elongate, parallel diverticulum. Penial sheath absent. Interior of penis with weak radial pilasters and small rhombic pads. Apical part of penis with a single large hook, associated with a spatulate “scoop” with microscopically serrated tip. Elsewhere in penis, an elongate cluster of short, simple hooks mounted on rhombic pads.

Range and habitat

Montane forest (1000 - 1200 m) in the Udzungwa Mountains, central Tanzania.

Remarks

This species is distinctive in its simple and weak dentition, weaker than in any other Dadagulella gen. nov. species except in D. rondoensis ( Verdcourt, 1994) comb. nov. and D. conoidea ( Verdcourt, 1996) comb. nov. which have a more conical shape. It can be distinguished from Gulella udzungwensis

van Bruggen, 2003, which also occurs on Mt. Mwanihana (van Bruggen 2003), by having a more acuminate spire and more pointed apex, deeper sutures, sinuous ribs and no basal tooth.