Napaeus arinagaensis Artiles, Deniz & Martín, 2011
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publication ID |
https://doi.org/ 10.11646/zootaxa.2901.1.3 |
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DOI |
https://doi.org/10.5281/zenodo.5292366 |
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persistent identifier |
https://treatment.plazi.org/id/8146737D-FFEF-FFD3-FF83-8952A6A6E39C |
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treatment provided by |
Felipe |
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scientific name |
Napaeus arinagaensis Artiles, Deniz & Martín |
| status |
sp. nov. |
Napaeus arinagaensis Artiles, Deniz & Martín View in CoL , n. sp.
Figs. 1 View FIGURE 1 , 2 View FIGURE 2 , 3 N View FIGURE 3 , 7 D–F View FIGURE 7 , 9 A View FIGURE 9
Type locality. North slope of Arinaga Mountain (Gran Canaria; UTM: 28RDR 6182, 180 m altitude).
Holotype ( Figs. 2 View FIGURE 2 , 3 N View FIGURE 3 ; empty shell): TFMC ( MT 0417 ). Leg. M. Valido and M. Ibáñez, 9 July 1989.
Paratypes. 36 shells collected between 1989 and 2010 from Arinaga Mountain (east of Gran Canaria); deposited in AIT and the following collections: JSGC (12 shells); MAGC (10 shells) .
Etymology. The specific name derives from its type locality, Arinaga Mountain.
Distribution and habitat ( Fig. 1 View FIGURE 1 ). Endemic to Gran Canaria, occupying an area of about 6 km 2 of the Arinaga mountain and its surroundings (southeast of the island), associated with lowland vegetation, within an altitudinal range between 30 and 180 m. We only found empty shells of this species, which is possibly extinct as living specimens were not recorded during the fieldwork since 1989, despite intensive searching.
Diagnosis. Shell slender, conic, almost smooth, shiny, with whorls increasing regularly in size. Aperture ovate, rounded at junction of columellar and palatal edges.
Description. Shell ( Figs. 2 View FIGURE 2 , 3 N View FIGURE 3 ) dextral, slender (SB/SH index), conic, with whorls increasing regularly in size; 6¾–7¼ convex whorls, deeply marked suture. Body whorl intermediate (BH/SH index), occupying less than ⅔ of the shell surface area (BS/SS index). Protoconch smooth, shiny, with about 1½ whorls. Aperture short and wide (AH/SH and AB/SB indices), ovate, rounded at junction of columellar and palatal edges. Angle ( Fig. 2 View FIGURE 2 ) between columella and upper palatal margin about 117º. Peristome discontinuous, expanded as narrow whitish lip, more developed in lower part of palatal edge and reflected on columellar edge, partly covering umbilical slit. Older specimens with a callosity between peristome edges and a small nodule at junction of parietal and palatal margins. Aperture extending laterally beyond penultimate whorl by about 42% (ca 0.8 mm).
The majority of the shells collected were bleached and whitish, but some of them, including the holotype, retain a part of the original coloration, being uniformly pale brown, without blotches. Shell ornamentation almost smooth ( Fig. 9 A View FIGURE 9 ), characterised by numerous weak, radial oblique ribs, only a few stronger on the body whorl. The shell has some gloss despite ribs.
Comparison with other taxa. The N. arinagaensis shell ( Fig. 3 N View FIGURE 3 ) is comparable in form and size to five species from Gran Canaria. It is clearly smaller than N. isletae Groh & Ibáñez, 1992 ( Fig. 3 P View FIGURE 3 ) and larger than N. exilis Henríquez, 1995 ( Fig. 3 M View FIGURE 3 ), N. myosotis (Webb & Berthelot, 1833) ( Fig. 3 L View FIGURE 3 ) and N. osoriensis ( Wollaston, 1878) ( Fig. 3 K View FIGURE 3 ). Napaeus arinagaensis is similar in shell size to N. moquinianus (Webb & Berthelot, 1833) ( Fig. 3 O View FIGURE 3 ), however, the latter has irregular whitish blotches on its shell and the surface areas of the first whorls and the entire shell of N. arinagaensis are smaller than those of N. moquinianus . Napaeus arinagaensis ( Fig. 3 N View FIGURE 3 ) and N. myosotis ( Fig. 3 L View FIGURE 3 ) are similar in the degree of convexity of their whorls whereas the other four species have flatter whorls.
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.