Dadagulella minareta, 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: 18-19

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Dadagulella minareta

sp. nov.

Dadagulella minareta   sp. nov.

Figs 30 View Figs 27-35 , 50 View Figs 43-50 , 58 View Figs 51-64 , 84 View Fig ; Table 1 View Table 1


From English ‘minaret’, the tower of a mosque; Latinized by the addition of the feminine ending ‘- a ’; used as a noun in apposition.

Type material examined

TANZANIA: holotype NMW.Z.2003.001.00010: 1 ad., Kimboza Forest Reserve (7.01°S, 37.78°E), Uluguru Mts, Morogoro District, lowland forest on limestone, approx. 300 m alt., leg. BR, PT, MBS & CFN, 5 Feb. 2003 GoogleMaps   . Paratype NMW. Z.2003.001.00011: 1 ad., data as holotype. Paratypes NMW. Z.2003.001.00012: 3 ads, data as holotype. Paratype NMW. Z.2003.001.00013: 1 ad., data as holotype. Paratype MRAC. MT.803795: 1 ad., data as holotype. Paratype NHMUK.20120260: 1 ad., data as holotype. Paratype NMK: 1 ad., data as holotype. Paratypes NMT: 2 ads, data as holotype. Paratype NMSA. L 863/ T 3062: 1 ad., data as holotype. Paratype RMNH.288088: 1 ad., data as holotype.

Other material examined

TANZANIA: NMW. Z.2003.001.00014: 1 juv., data as holotype. NMW. Z.2004.016.00008: 2 ads, Kanga Forest Reserve (6.01° S, 37.72° E), Nguru Mts, Mvomero District, lowland forest at approx. 450 m alt., leg. BR, PT & CFN, 26 Jun. 2004. NMW. Z.1995.016.00012: 4 ads, 1 juv. Pugu Forest (6.89° S, 39.09° E), S of Dar es Salaam (site I), leg. PT, 6 Mar. 1995. The juv. in the Pugu lot may not be conspecific.


SHELL ( Figs 30 View Figs 27-35 , 50 View Figs 43-50 , 58 View Figs 51-64 ). Medium-sized (3.40 - 4.00 mm high x 1.80 - 2.00 mm wide), of 6.0 - 7.0 whorls. Ovate-acuminate, spire acuminate to coeloconoid (spire angle 48 - 63°).Apex sharply pointed. Embryonic whorls with fine regular radial striae; smoothly granulate where worn. Later whorls with relatively coarse, usually sinuous ribs (10 - 13 per mm on penultimate whorl). Sutures deep. Umbilicus narrowly open. Peristome complete or incomplete parietally. Outer palatal surface of aperture with a furrow-like depression corresponding to the palatal tooth. Dentition 5-fold to 7-fold, consisting of: one V-shaped parietal tooth; one bifid, slab-like, deeply in-running palatal tooth, not usually forming a parieto-palatal sinus; and two columellar teeth. The upper of these is large and characteristically squarish, running in to form a columellar baffle which is connected to it; the lower columellar tooth is a small in-running denticle. Additional teeth include an extra parietal tooth and/or one or two shallow columellar denticles. Juvenile shell ( Fig. 50 View Figs 43-50 ) with 3-fold to 4-fold dentition: one very short parietal lamella; two basal teeth (or one bifid tooth); and one columellar tooth. Earlier basal and columellar teeth are retained.

CEPHALOPODIUM. Pale yellow, with apricot tentacle retractors.

SALIVARY GLANDS. United, soft, not tumid, elongate, Y-shaped; each duct leaving at the apex of the lobe and evenly thick throughout.

RADULA. Not successfully prepared.

GENITALIA. Vas deferens thickened prior to insertion on penis but apparently without diverticulum. Penial sheath absent but with a thin sheath-like layer contiguous with wall of lower penis. Interior of penis with weak radial pilasters and small rhombic pads. Apical part of penis with a broad “scoop” with microscopically serrated tip, but without large hook. Elsewhere in penis a single longitudinal row of short, simple hooks mounted on rhombic pads.

Range and habitat

In forest at the type locality and in Pugu Hills Nature Reserve, both in the eastern Tanzanian lowlands, and in lowland forest on Mt. Kanga in the Nguru Mts.


The dentition, most noticeably the squared-off shallow columellar tooth that runs in to connect with the baffle, readily distinguishes this species from D. ecclesiola   sp. nov. (which also occurs at Kimboza) and D. r. radius   comb. nov. (which also occurs at both Kimboza and Pugu). It also distinguishes it from D. cuspidata ( Verdcourt, 1962)   comb. nov., with which it shares the strong upper columellar tooth and fine regular radial striae on the embryonic whorls. It differs from D. cresswelli   sp. nov., with which it shares the furrow-like depression on the outer palatal surface, in dentition and in having stronger ribs.


Royal Botanic Garden Edinburgh


University of Copenhagen


Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet


Harvard University - Arnold Arboretum


Naturhistorisches Museum, Wien


Universität Zürich


Musée Royal de l’Afrique Centrale


Mus. Tinro, Vladyvostok


Natural History Museum, London


National Museums of Kenya


KwaZulu-Natal Museum


Nationaal Herbarium Nederland, Leiden University branch


Tavera, Department of Geology and Geophysics


National Museum of Natural History, Naturalis


Department of Botany, Swedish Museum of Natural History


Embrapa Agrobiology Diazothrophic Microbial Culture Collection


Clifton College


"Alexandru Ioan Cuza" University