Dadagulella ecclesiola, 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 : 16

Dadagulella ecclesiola sp. nov.

urn:lsid:zoobank.org:act:CCE56537-B647-4144-AB07-FE322A139087 Figs 28 , 49 , 56 , 84 ; Table 1

Etymology

From Latin ‘ ecclesiola ’, feminine, diminutive of ‘church’ (or ‘the church’); used arbitrarily to distinguish the species from D. minareta sp. nov. with which it occurs.

Type material examined

TANZANIA: holotype NMW.Z.2003.001.00015 : 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. Paratypes NMW. Z.2003.001.00016: 8 ads, data as holotype. Paratype MRAC. MT.803794: 1 ad., data as holotype. Paratype NHMUK.20120259: 1 ad., data as holotype. Paratype NMK: 1 ad., data as holotype. Paratype NMT: 1 ad., data as holotype. Paratype NMSA. L 8692/ T 3061: 1 ad., data as holotype. Paratype RMNH. MOL.288089: 1 ad., data as holotype.

Other material examined

TANZANIA: NMW. Z.2003.001.00017: 1 ad., data as holotype, sequenced by Rowson et al. (2010 a) as “ Gulella cf. browni Uluguru ”. NMW. Z.2003.001.00018: 3 ads in poor condition, 3 juvs, data as holotype.

Description

SHELL ( Figs 28 , 49 , 56 ). Small to medium-sized (3.20 - 3.70 mm high x 1.80 - 1.90 mm wide), of 5.5 - 7.0 whorls. Ovate-acuminate, spire narrowly accuminate (spire angle 53 - 65°). Apex pointed. Embryonic whorls smoothly granulate. Later whorls with relatively coarse, often sinuous ribs (8 - 14 per mm on penultimate whorl). Sutures deep. Umbilicus closed. Peristome complete. Outer palatal surface of aperture with a depression, often furrow-like, corresponding to the palatal tooth. Dentition 4-fold, consisting of: one strongly oblique parietal tooth, V-shaped when shell turned to the left; one large slablike palatal tooth, forming a narrow, horizontal parieto-palatal sinus; and a deep-set columellar baffle. A basal denticle is also present, presumably in all specimens, but is partly or completely hidden by the palatal tooth which occludes much of the aperture. The denticle is visible when the shell is turned to the right ( Fig. 56 ). Juvenile shells not known with certainty: an individual from Kimboza ( Fig. 49 ), with dentition like that of a juvenile D. r. radius comb. nov., might belong to this species. Anatomy unknown.

Range and habitat

In forest at the type locality in the eastern Tanzanian lowlands.

Remarks

This species has much simpler dentition than D. minareta sp. nov. (which also occurs at Kimboza), and is usually smaller, with straight rather than sinuous ribs. Its dentition is more like that of D. r. radius comb. nov. (which again also occurs at Kimboza; Fig. 16 ) and D. minuscula minuscula ( Morelet, 1877) comb. nov. but D. ecclesiola sp. nov. lacks the shallow columellar tooth, has a hidden or partly hidden basal denticle, and has a much narrower parieto-palatal sinus. It further differs from D. minuscula minuscula comb. nov. in having stronger ribs.

Figures

Figs 27-35. Adult shells of Dadagulella gen. nov. species. 27. D. delgada (Muratov, 2010) comb. nov., syntype, Cabo Delgado (after Muratov 2010). 28. D. ecclesiola sp. nov., holotype, Kimboza. 29. D. cresswelli sp. nov., holotype, Ngorongoro. 30. D. minareta sp. nov., holotype, Kimboza. 31. D. cuspidata (Verdcourt, 1962) comb. nov., holotype, Shume. 32. D. pembensis sp. nov., holotype, Ngezi. 33. D. nictitans (Rowson & Lange, 2007) comb. nov., holotype, Macha. 34. D. frontierarum sp. nov., holotype, Mtai. 35. D. delta sp. nov., holotype, Mwanihana.

Figs 43-50. Juvenile shells of Dadagulella gen. nov. species, with dentition emphasized in basal view including earlier dentition visible through the shell. 43-45. D. radius radius, Mbudya I. 46. D. pembensis sp. nov., Ngezi. 47-48. D. browni browni, Mwanihana. 49.? D. ecclesiola sp. nov., Kimboza. 50. D. minareta sp. nov., Kimboza.

Figs 51-64. Apertures of adult shells of Dadagulella gen. nov. species (not to scale). 51. D. radius calva, lectotype, Taru Desert. 52. D. radius radius, lectotype, Shimba Hills. 53. D. radius radius, Amboni. 54. D. browni mafiensis subsp. nov., holotype, Mlula. 55. D. browni semulikiensis subsp. nov., holotype, Semuliki NP. 56. D. ecclesiola sp. nov., holotype, Kimboza (two views of shell showing basal tooth only visible when shell angled). 57. D. cresswelli sp. nov., holotype, Ngorongoro. 58. D. minareta sp. nov., holotype, Kimboza. 59. D. cuspidata comb. nov., holotype, Shume (note shell angled slightly differently to that in Fig. 31). 60. D. pembensis sp. nov., holotype, Ngezi. 61. D. frontierarum sp. nov., holotype, Mtai. 62. D. minuscula minuscula, lectotype, Nzwani. 63. D. minuscula minuscula, paralectotype, Nzwani. 64. D. minuscula mahorana subsp. nov., holotype, Mayotte.

Fig. 84. Distribution of Dadagulella gen. nov. species, based on published records and material examined here (for additional records of D. meredithae comb. nov. in northern Malawi see van Bruggen 2000). The inset on the left corresponds to the map on the right.

Figs 6-26.Adult shells of Dadagulella radius (Preston, 1910) comb. nov., D. browni (van Bruggen, 1969) comb. nov. and their respective subspecies. 6-20. D. radius comb. nov. s.l. 6-8. D. radius calva (Connolly, 1922): 6. Lectotype, Taru Desert. 7. Taru Desert near Malindi. 8. Near Mombasa. 9-20. D. radius radius: 11. Lectotype, Shimba Hills. 12. Gazi. 13. also Gazi. 14. Diani Beach. 15. Amboni. 16. Kimboza. 17. Mkungwe. 18. Pugu. 19. Mbudya I. 20. Jozani. 21-26. D. browni comb. nov. s.l.: 21. D. browni mafiensis subsp. nov., holotype, Mlula. 22. D. browni semulikiensis subsp. nov., holotype, Semuliki NP. 23-26. D. browni browni: 23. Mwanihana. 24. Mzelezi. 25. Pomene Bay. 26. Holotype, Lake Sibayi (after van Bruggen 1969).