Lyroconus plagioptycha (Shuttleworth, 1854)

Lyroconus plagioptycha (Shuttleworth, 1854) View in CoL

Figs 8 View Figure 8 , 9 View Figure 9

Helix plagioptycha Shuttleworth, 1854: 37 .

Thysanophora plagioptycha (Shuttleworth, 1854) — Pilsbry (1920): 94, figs 2, 3. View in CoL

Lyroconus plagioptycha (Shuttleworth, 1854) — Schileyko (2006): 1896. View in CoL

Link.

https://molluscabase.org/aphia.php?p=taxdetails&id=1065439.

Material examined.

French Guiana • 1 dry specimen; Régina, Montagne Favard (Montagne de Kaw), ca 200 m sur le chemin W depuis la fin de la route (dégrad) D 6 (COT 03) ; 4.5 ° N, 52.05722 ° W; 20 Oct. 1997; TR, OG leg.; Petit ruisseau, forêt; MNHN -IM-2012-21187 GoogleMaps • 1 dry specimen; Remire-Montjoly, Lotissement DDE, 1.4 km sur la route des plages (D 1) après le carrefour de Dégrad des Cannes, Montagne du Mahury (COT 06) ; 4.86056 ° N, 52.25917 ° W; alt. 15 m; 21 Oct. 1997; TR, OG leg.; culture de bananes et papayes; MNHN -IM-2012-23924 GoogleMaps • 3 dry specimens; Roura, Crique Sourou, Rte forestière de Nancibo (COT 10) ; 4.67273 ° N, 52.42825 ° W; alt. 10 m; 23 Oct. 1997; TR, OG leg.; ripisylve, sol alluvial; MNHN -IM-2022-2131 GoogleMaps • 1 dry specimen; Saint-Laurent-du-Maroni, Rte du Plateau des cascades, plateau des mines, 3.7 km après la D 11 (COT 27) ; 5.38569 ° N, 54.06283 ° W; 28 Oct. 1997; TR, OG leg.; reste de forêt sur une route bordée de parcelles conquises sur la forêt; MNHN -IM-2022-2130 GoogleMaps • 1 dry specimen; Sinnamary, Petit Saut, 1.4 km avant le rond-point “ barrage du Petit Saut ” (COT 30) ; 5.06111 ° N, 52.99778 ° W; 28 Oct. 1997; TR, OG leg.; forêt dense, fond de talweg; MNHN -IM-2022-2137 GoogleMaps • 24 dry specimens; Saül (SAUL 25) ; 3.61274 ° N, 53.21626 ° W; alt. 174 m; 17 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Pied d’arbre à contrefort; MNHN -IM-2012-21932 GoogleMaps • 5 95 % ethanol specimens; Saül (SAUL 25) ; 3.61274 ° N, 53.21626 ° W; alt. 174 m; 17 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Pied d’arbre à contrefort; MNHN -IM-2013-75621 GoogleMaps • 2 dry specimens; Saül (SAUL 37) ; 3.63555 ° N, 53.21035 ° W; alt. 276 m; 21 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Autour d’un arbre à contreforts; MNHN -IM-2012-21956 GoogleMaps • 2 95 % ethanol specimens; Saül (SAUL 37) ; 3.63555 ° N, 53.21035 ° W; alt. 276 m; 21 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Autour d’un arbre à contreforts; MNHN -IM-2013-75655 GoogleMaps • 4 dry specimens; Saül, Versant nord de Bœuf Mort, le long du sentier de Grand Bœuf Mort (SAUL 44) ; 3.64098 ° N, 53.21863 ° W; alt. 300 m; 24 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Pied d’arbre à contreforts; MNHN -IM-2012-21965 GoogleMaps • 1 95 % ethanol specimen; Saül, Cascades au pied du Galbao (SAUL 49) ; 3.60254 ° N, 53.26051 ° W; alt. 220 m; 29 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Chaos rocheux; GenBank: PQ 629103; Bold: DREAL 353-23 ; MNHN -IM-2013-75961 GoogleMaps • 1 dry specimen; Saül, Cascades au pied du Galbao (SAUL 49) ; 3.60254 ° N, 53.26051 ° W; alt. 220 m; 29 Nov. 2018; OG, SS, ST, BF ( PAG & MNHN) leg.; Chaos rocheux; MNHN -IM-2018-677 GoogleMaps • 1 95 % ethanol specimen; Mana, Layon C vers 1900 m (TRI 19) ; 4.583 ° N, 53.40587 ° W; alt. 50 m; 14 Apr. 2019; BF, ST ( MNHN / ONF) leg.; forêt de lianes; GenBank: PQ 629104; Bold: DREAL 358-23 ; MNHN -IM-2013-75993 GoogleMaps • 1 95 % ethanol specimen; Mana, cambrouse layon C à environ 1300 m du camp Aya (TRI 20) ; 4.58417 ° N, 53.4054 ° W; alt. 80 m; 14 Apr. 2019; BF, ST ( MNHN / ONF) leg.; Cambrouse; MNHN -IM-2013-75819 GoogleMaps • 3 dry specimens; same data as preceding; MNHN -IM-2014-7922 GoogleMaps • 2 dry specimens; Mana, Layon inselberg 120 m (pente inselberg) (TRI 21) ; 4.61157 ° N, 53.40833 ° W; alt. 180 m; 15 Apr. 2019; BF, ST ( MNHN / ONF) leg.; pied de rochers granitiques; MNHN -IM-2014-7923 GoogleMaps • 1 95 % ethanol specimen; Mana, Réserve naturelle de La Trinité, Layon C à environ 1600 m du camp Aya (TRI 31) ; 4.58421 ° N, 53.40542 ° W; alt. 67 m; 18 Apr. 2019; BF, ST ( MNHN / ONF) leg.; Cambrouse; GenBank: PQ 629101; Bold: DREAL 364-23 ; MNHN -IM-2013-75992 GoogleMaps • 1 95 % ethanol specimen; Mana, Réserve naturelle de La Trinité, Layon C à environ 1600 m du camp Aya (TRI 31) ; 4.58421 ° N, 53.40542 ° W; alt. 67 m; 18 Apr. 2019; BF, ST ( MNHN / ONF) leg.; Cambrouse; MNHN -IM-2013-75820 GoogleMaps • 12 dry specimens; Mana, Réserve naturelle de La Trinité, Layon C à environ 1600 m du camp Aya (TRI 31) ; 4.58421 ° N, 53.40542 ° W; alt. 67 m; 18 Apr. 2019; BF, ST ( MNHN / ONF) leg.; Cambrouse; MNHN -IM-2014-7924 GoogleMaps • 2 dry specimens; Saül, Chemin des Monts la Fumée (SAUL 63) ; 3.63119 ° N, 53.20586 ° W; alt. 177 m; 18 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Pied d’arbre à contrefort; MNHN -IM-2018-14083 GoogleMaps • 1 dry specimen; Saül, Cascades du Mont Galbao, face nord-est (SAUL 64) ; 3.60376 ° N, 53.26121 ° W; alt. 320 m; 19 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Bordure de cambrouse; MNHN -IM-2018-14067 GoogleMaps • 3 dry specimens; Saül, Mont Galbao face nord-est (SAUL 65) ; 3.59681 ° N, 53.26257 ° W; alt. 503 m; 20 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Cambrouse et lianes en forêt; MNHN -IM-2018-14051 GoogleMaps • 1 95 % ethanol specimen; Saül, Mont Galbao face nord-est (SAUL 65) ; 3.59681 ° N, 53.26257 ° W; alt. 503 m; 20 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; Cambrouse et lianes en forêt; MNHN -IM-2013-76405 GoogleMaps • 1 dry specimen; Saül (SAUL 70) ; 3.60864 ° N, 53.21492 ° W; alt. 212 m; 23 Feb. 2020; BF, AA, OG ( PAG & MNHN) leg.; MNHN -IM-2018-14120 GoogleMaps .

Remarks.

All specimens collected in French Guiana are consistent with the diagnosis by Pilsbry (1920) and the illustration of syntype NMBE 18878 figured in Neubert and Gosteli (2003: pl. 20 fig. 4).

Lyroconus plagioptycha (type locality Puerto Rico) is a widespread species in Greater Antilles and Central America from Florida to Venezuela (https://www.gbif.org/species/5190501), and was recently recorded in northeastern Brazil ( Salvador et al. 2021). It was reported from Suriname as early as 1960 ( Altena 1960). Until now it has never been recorded from French Guiana and this is the first record of the family Thysanophoridae in this territory.

In French Guiana, the species is known from 10 to 500 m a. s. l. both on coastal areas (e. g., Saint-Laurent, Cayenne, Kaw mountain) as well as in the interior in Saül and Trinité.

Two haplotypes were recovered, one from Mana and the other from Saül. Despite their large genetic difference (p - distance 2.7 %), the specimens appear identical in morphology.