Gouldipoma callipeplum ( Solem, 1961 )

Watters, G. Thomas, 2014, A revision of the Annulariidae of Central America (Gastropoda: Littorinoidea), Zootaxa 3878 (4), pp. 301-350 : 322-323

Gouldipoma callipeplum ( Solem, 1961)

Figures 6 A–F , 12 D

Type material. USNM 186093, holotype; USNM 355011; FMNH 90603 (fig. 6 A); ANSP 97595, 134657; UIMNH 25952 (6), all paratypes (figs. 6 B–F); CMNH 62.7646 (3), “ types.” Type locality. “ near Wani, Nicaragua.”

Type figured. Solem, 1961: pl. 11, fig. 21.

Chresonymy.

Chondropoma callipeplum Fluck, 1906: 4 [nomen nudum].

Chondropoma callipeplum Solem, 1961: 206 , pl. 11, fig. 21, pl. 12, fig. 24r, map 2; Jacobson, 1968: 117; Watters, 2006: 183.

Chondropoma callipeplum “Bartsch. ” Parodiz & Tripp, 1988: 131.

Gouldipoma callipeplum ( Solem, 1961) . Watters, 2006: 72, 183.

Chondropoma (Chondropomium) callipeplum Solem, 1961 . Thompson, 2011: 43, 282.

Distribution and habitat. Cordillera Isabella of Nicaragua. Solem (1961) mentioned the type locality and the La Luiz Mine near Suira [ Suina ], both in the Región Autónoma del Atlántico Norte. The exact limits of its range are unknown. Specific habitat unknown.

Conservation. Little if any of this species’ distribution occurs in protected areas.

Other material (specimens examined: 6). Nicaragua. Región Autónoma del Atlántico Norte: INHS 25952 (6), near Wani.

Description. Shell high spired, thin, last whorl solute just before aperture. Smallest adult specimen seen 11.6 mm in length, largest 14.2 mm, average 13.1 mm (decollate). Protoconch lost in most adults, 1.5 [ 2 fide Solem, 1961] prominent, rounded, flat-topped whorls with a broad, diffuse central pale tan area; poorly demarcated from teleoconch. Teleoconch of 5–5.5 rounded whorls. Umbilicus open, not occluded by outer lip. Spiral sculpture absent except for two very weak cords delimiting the umbilicus. Axial sculpture of ca. 85 regularly and widely spaced narrow, low lamellae. Suture indented, not channeled. Tufts absent but the axial lamellae may render the suture serrate. Aperture nearly circular. Inner lip smooth, moderately exserted and reflected. Outer lip very narrow, narrowest facing umbilicus, weakly auriculate posteriorly, solute from previous whorl. Base color dingy white with ca. 6 widely separated spiral brown bands, usually interrupted into blotches or dashes; bands do not appear on adapertural face of peristome. Operculum not seen. Radula and anatomy unknown.

Variation in specimens. The few specimens seen are very uniform in all characteristics.

Comparison with other species. Gouldipoma callipeplum lacks the pigmented “collar” behind the peristome seen in G. c o l t ro r u m, G. terecostatum , and G. thomasi . It also lacks the clathrate sculpture of G. chrysostiria . The checkerboard color pattern resembles some forms of the Mexican P. cordovanus and P. rubicundus , but those species have much more expanded outer lips.

Remarks. According to Fluck (1906: 4) this species was originally “to be described by Bartsch.” As pointed out by Solem (1961), Fluck’s use of the name was a nomen nudum. This is the only species known from Nicaragua and is 250 km away from the nearest otyher annulariid species, G. chrysostiria from northern Honduras. It is most closely related to G. thomasi ( Solem, 1961) from Panamá, 800 km away, and other species in South America.

Solem (1961) did not note a calcareous lamella on the operculum and none of the specimens seen here still possessed an operculum. However, examination of the other Gouldipoma shows that they do possess a lamella but it is usually completely worn away leaving only the chondroid base. This species probably has a lamella as well.

Original description. “Shell elongate-conic, whorls 6 1/8 to 6 7/8, moderately rounded without deeply impressed sutures. Color slight straw-brown, with irregularly spaced brownish –red dots in a spiral pattern. Apical whorls 2, smooth, brownish below, white above, with a conspicuous plug just below their terminal point. Sculpture of moderately high, widely spaced, slightly retractive radial ribs, with a slight degree of individual tufting at the sutures. Spiral sculpture absent. Body whorl barely solute with the peristome free of the penultimate whorl. Peristome narrow, only slightly reflected, multiplex. Umbilicus open with traces of two or three spiral cords. Operculum with moderately acentral nucleus, no calcareous ribs, margins slightly upturned.”

Etymology. G. kallos, beauty + L. peplum, robe for the statue of Athena—beautifully clad.

Figures

FIGURE 6 A – F. Gouldipoma callipeplum (Solem, 1961). A. FMNH 90603, paratype, 12.3 mm, photo courtesy of J. Gerber (FMNH). B – F. UINHM 25952, paratypes. B – C. 11.6 mm. D. 12.1 mm. E – F. 14.2 mm. FIGURE 6 G – S. Gouldipoma chrysostiria new species. G – H. UF 479667, holotype, 14.3 mm. I. UF 479667, paratype, 13.6 mm. J. UF 221351, 16.5 mm. K. UF 221412, 11.3 mm. L. UF 221412, 15.9 mm. M. UF 221164, 11.1 mm. N. UF 221164, 15.6 mm. O. UF 221391, 15.5 mm. P. UF 221391, 14.7 mm. Q. UF 221326, 15.1 mm. R. UF 211969, 13.2 mm. S. UF 212016, 14.0 mm. FIGURE 6 T – Y. Gouldipoma thomasi (Solem, 1961). T – U. FMNH 93390, holotype, 17.7 mm, photo courtesy of J. Gerber (FMNH). V – W. GTW 9121 a, 15.0 mm. X – Y. GTW 9121 b, 17.8 mm.

FIGURE 12 A – D. Distribution maps. A. Choanopomops largillierti (Pfeiffer, 1846) (black); Parachondria rubicundus (Morelet, 1849) (red); Parachondria cordovanus Pfeiffer, 1857 (blue); Paridoxipoma enigmaticum new species (white). B. Halotudora sumichrasti (Crosse & Fischer, 1874) (blue); Halotudora gaigei (Bequaert & Clench, 1931) (black); Diplopoma osberti (Tristram, 1861) (red); Halotudora gruneri (Pfeiffer, 1846) (white). C. Gouldipoma chiapasense (Crosse & Fischer, 1877) (red); Diplopoma rigidulum (Morelet, 1851) (black); Tudorisca andrewsae (Ancey, 1886) (blue); Gouldipoma coltrorum new species (white); Gouldipoma thomasi (Solem, 1961) (purple). D. Gouldipoma trochlearis (Pfeiffer, 1852) (red); Halotudora kuesteri (Pfeiffer, 1852) (black); Gouldipoma terecostatum (Thompson, 1966) (blue); Gouldipoma chrysostiria new species (purple); Gouldipoma callipeplum (Solem, 1961) (white).