Exotic
Gymnandrosoma trachycerus Forbes (Tortricidae: Olethreutinae: Grapholitini)
FWL: 8.3-9.6 mm (males); 8.0-11.2 mm (females)
Head dark brown, terminal segment of labial palpus white; thorax brown with a median transverse white and reddish-brown band; male without sex scale tuft on hind tibia; ground color of forewing brown, median fasciaefasciae:
plural of "fascia"
darker, costal patch of median fasciafascia:
a dark transverse band on the forewing 
white, reddish-brown, or pale reddish-brown, postmedian spot present, white; hindwing brown.
Male genitalia are characterized by uncusuncus:
a sclerotized process which is fused to the posterodorsal margin of tergum IX
, sociisocii:
a pair of lightly sclerotized setose lobes
absent; distally-swollen valvaevalvae:
plural of "valva"
with two to five short, stout spines on the laterallateral:
to the side
margin, and a slender, pistol-shaped phallusphallus:
the male intromittent organ (penis); see "aedeagus" 
. Female genitalia are characterized by simple, narrow papillae analespapillae anales:
the female ovipositor lobes 
; a scobinatescobinate:
rasplike
patch near the junction of the corpus bursaecorpus bursae:
a dilated membranous sac at the anterior end of the bursa copulatrix
and ductus bursaeductus bursae:
a membranous tube connecting the ostium bursae to the corpus bursae
extending to nearly signasigna:
plural of "signum"
; ductus bursaeductus bursae:
a membranous tube connecting the ostium bursae to the corpus bursae without a spiral; and a pair of large, knife-like, opposed signasigna:
plural of "signum".
The larva was first described by Fennah (1942)Fennah (1942):
Fennah, R. G. 1942. The ldquo;Orange Mothrdquo; of Dominica, B.W.I. Tropical Agriculture. 19(4): 73-78.. The following account is summarized from Adamski & Brown (2001).
Mature larva 12-16 mm in length, spicules extremely fine, head and prothoracic shieldprothoracic shield:
a sclerotized plate on the dorsal surface of the prothorax 
pale yellow, SD1 slightly venteroanterad of spiracle on A8; SV group on A1, 2, 7, 8, 9 extremely variable: 3(2):3:3(2):2:2(1). Additional chaetotaxychaetotaxy:
the arrangement of setae (in reference to Lepidoptera larvae), often depicted on a "setal map"
details are available in Adamski & Brown (2001).
Gymnandrosoma trachycerus is very similar to several other species of Gymnandrosoma. It is best identified by the absence of certain characters present in other species. It lacks the white thoracic tuft of G. leucothorax, the notched antenna of males of G. aurantianum, and the complex male secondary features on the dorsumdorsum:
the lower (usually posterior) or inner margin 
of the abdomen present in other species of Gymnandrosoma.
The following account is summarized from Fennah (1942)Fennah (1942):
Fennah, R. G. 1942. The ldquo;Orange Mothrdquo; of Dominica, B.W.I. Tropical Agriculture. 19(4): 73-78..
In Dominica, larvae initially feed in the outer, fleshy fruit of Simarouba amara before boring into the seed to feed on the cotyledons. A single larva feeds in each fruit. Pupation usually occurs on the ground, but occasionally takes place inside the fruit. Citrus is also utilized in late May and early June as the first crop of oranges are developing. Adults have been collected year-round in the Caribbean and from coastal elevations all the way up to montane rain forests.
| Host plant | Host plant family | Reference(s) |
| Citrus sp. | Rutaceae | Fennah 1942Fennah 1942: Fennah, R. G. 1942. The ldquo;Orange Mothrdquo; of Dominica, B.W.I. Tropical Agriculture. 19(4): 73-78. |
| Simarouba amara | Simaroubaceae | Fennah 1942Fennah 1942: Fennah, R. G. 1942. The ldquo;Orange Mothrdquo; of Dominica, B.W.I. Tropical Agriculture. 19(4): 73-78. |
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Gymandrosoma trachycerus is distributed throughout the Caribbean, with records from Hispaniola, Puerto Rico, the British Virgin Islands, Guadeloupe, Dominica, and Martinique.
