Parachondria (Chondropomorus) arcisensis Watters, 2016, new species
Creators: name: Watters, G. Thomas
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Pomatiidae
Parachondria
Parachondria arcisensis

description: Parachondria (Chondropomorus) arcisensis new species
Figures 1 I–O, 5 A
Type material. UF 216749, holotype, 13.0 mm; UF 216749, paratype 1, 12.7 mm; UF 33176, paratype 2, 12.0 mm.
Type locality. 750 m, Citadelle Laferrière, Départment du Nord, Haiti.
Chresonymy. Chondropoma (Chondropomorus) petitianum hispaniolae “ Clench & Aguayo, 1937 ” Bartsch, 1946: 18, 20, pl. 2, fig. 1 [misidentification].
Distribution and habitat. The northern face of the Massif du Nord at ca. 700–900 m, from Milot almost to Plaisance, but there are very few records of this rare species. It has been recorded from limestone outcrops in scrub thickets.
Material examined (6 specimens). Haiti. UF 216749(4), 750 m, Citadelle Laferrière, Départment du Nord; UF 33176(1), 840 m, 7 km WNW of Marmelade, Départment de l’Artibonite; UF 216452(1), “ Haiti.”
Description. Shell thin but solid, opaque, high-spired, elongate conic. Maximum adult size: 15.1 mm, decollate. Minimum adult size: 10.3 mm, decollate. Adult shell usually decollated, protoconch of 1.5 minute, smooth white whorls, demarcation between protoconch and teleoconch not well-defined. Teleoconch of 5.5 whorls. Axial sculpture of final whorl of numerous (ca. 90) very fine threads. Spiral sculpture of final whorl ca. 25 irregular, narrow threads, some occasionally larger than others rendering shell profile slightly carinate. Intersections of axial and spiral sculpture are minutely beaded with microscopically fenestrate appearance. Umbilicus bounded by 2–3 cords. Suture not channeled. Tufts composed of single, only slightly enlarged axial threads. Aperture oval, lip double. Inner lip erect from outer lip. Outer lip widely expanded, except much narrower facing umbilicus, adnate with previous whorl. Wide posterior auricle present. Color pattern complex and variable. Base color white or tan. Smudged tan axial zig-zags or dots that continue as brown bands on both sides of outer lip and inner lip. Tufts white. Operculum lacking in all specimens examined.
Variation in specimens. In the few specimens seen the color pattern varies from well-developed to nearly absent.
I–O. Parachondria (Chondropomorus) arcisensis new species. I, J. UF 216749, holotype, 13.0 mm. K. UF 216749, paratype 1, 12.7 mm. L. UF 216452, 14.3 mm. M. UF 33176, paratype 2, 12.0 mm. N. UF 33176, paratype 2, detail of spire. O. UF 216749, holotype, detail of suture.
P–W. Parachondria (Chondropomorus) caricae (Pfeiffer, 1858). P. Chondropoma (Chondropomorus) caricae sosuense Bartsch, 1946: NMNH 336770, holotype, 13.3 mm. Q. Chondropoma (Chondropomorus) caricae navarretense Bartsch, 1946: NMNH 471990, holotype, 12.2 mm. R, S. GTW 7072 c, 12.7 mm. T. OSUM 22087, 10.6 mm. U. OSUM 22087, 10.4 mm. V. OSUM 22087, detail of spire. W. OSUM 22087, detail of suture.
X–AE. Parachondria (Chondropomorus) coroni (Bartsch, 1946). X,Y. NMNH 493320, holotype, 15.0 mm. Z, AA. UF 33282, 16.8 mm. AB. UF 33282, 16.3 mm. AC. UF 32051, 16.0 mm. AD. UF 33282, detail of spire. AE. UF 33282, detail of suture. AF–AI. Parachondria (Chondropomorus) dessalinesi (Bartsch, 1946). AF,AG. NMNH 471984, holotype, 14.0 mm. AH. NMNH 471984, holotype, detail of spire. AI. NMNH 471984, holotype, detail of suture.
Comparison with other species. This species differs from the occasionally sympatric P. hispaniolae in having coarser sculpture that tends towards carinate spiral cords; it does not have the polished, plastic appearance of P. hispaniolae. Also see under P. anatolensis and P. silvaticus.
Remarks. Bartsch (1946) identified this species as Chondropoma (Chondropomorus) petitianum hispaniolae Clench & Aguayo, 1937, but comparison with the types of that species clearly shows it is not the same taxon. Etymology. L. arcis, fortress, citadel + - ensis, from the Citadelle Laferrière.
description: Published as part of Watters, G. Thomas, 2016, Review of the Hispaniolan Parachondria (Chondropomorus) complex (Gastropoda: Littorinoidea: Annulariidae), pp. 245-275 in Zootaxa 4127 (2) on pages 248-250, DOI: 10.11646/zootaxa.4127.2.2, http://zenodo.org/record/271772