Dineutus longimanus longimanus (Olivier, 1795)

Gustafson, Grey T. & Miller, Kelly B., 2015, The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini), ZooKeys 476, pp. 1-135 : 51

Dineutus longimanus longimanus (Olivier, 1795) Figures 24, 25, 51, 55

Gyrinus longimanus Olivier 1795: 701, Gyrinus excisus Forsberg 1821: 301 [synonymy by Aubé 1838], Dineutes longimanus : Aubé 1838 a: 408, Dineutus longimanus : Ochs 1924: 5. Dineutus (Cyclinus) longimanus : Hatch 1925b: 488, Dineutus (Dineutus) longimanus : Ochs 1926a: 138, Dineutus longimanus : Blackwelder 1944: 81, Dineutus (Rhombodineutus) longimanus : Guignot 1950: 127, Dineutus (Cyclinus) longimanus : Brinck 1955: 106.

Type locality.

Saint-Domingue (= Hispaniola).

Specimens examined.

25

Type material examined.

Gyrinus longimanus Olivier, 1795: lectotype, here designated: (♂ pinned) "MUSEUM PARIS/ I. St. Domingue/ COLL. BOSC 1828 [beige label, typed black ink, except I. St. Domingue handwritten in black ink, handwriting unknown]// Gyrinus longimanus / I. St. Domingue Oliv. [beige label with black border, handwritten in black ink, handwriting appears to be Olivier’s]// TYPE [red label, typed black ink]// LECTOTYPUS/ P. Brinck designavit 1955. [white label, typed black ink]// TYPE [red label, typed black ink]// LECTOTYPE [red label, typed black ink]//" deposited in the MNHN.

Material examined.

DOMINICAN REPUBLIC: Pedernales Prov.: W of Pedernales, on rd to border with Haiti, 18.154° '-71.582°, 13.v.2010, leg. G.J. Svenson, sweeping in dry for. & sec. veg. (17 ex. MSBA); N of Pedernales, La Aguita, 18°09.172'N, 71°44.786'W, 188 m, 21.vii.1999, leg. M.A. Ivie, Guerrero, & Dominici (5 ex. WIBF); 1 km N of Banano, Rio Mulitos, 18°09.258'N, 71°45.384'W, 290 m, 17.vi.2005, leg. G. Nearns, (2 ex. FSCA).

Diagnosis.

Male (Fig. 24C-D). Size: 12.3-13.9 mm. Body form regularly elongate oval, elytra laterally slightly broadened after basal half; elytral apices spinose, with sutural angle produce to a spine, and a second parasutural spine, with small thorn-like serrations and irregularities present apically but greatly reduced apicolaterally, apicolateral sinuation present and shallow, elytra with reticulation strong laterally and apically, producing a bronzy appearance, medial disc with reticulation more weakly impressed and composed of smaller transversely ovoid cells accompanied by shallowly impressed punctation, striae mostly effaced by reticulation, if evident at all faintly apparent medially on disc, lateral marginal depression of elytra shallow; profemora with very small sub-apicoventral tooth; protibiae club-shaped; mesotarsal claws (Fig. 25C) with ventral margin with a well developed denticle; metacoxae with a sparse covering of very shallow punctures over most their ventral face, laterally only present on posterior margin; venter lightly colored: reddish orange to orangey yellow. Aedeagus (Fig. 25A, B, D) with median lobe in dorsal view shorter than parameres, nearly parallel sided, broader basally and weakly narrowed apicad, in apical 1/4 shallowly narrowed towards apex, apex regularly rounded, dorsally without narrow carina, ventrally sperm-groove narrow and parallel sided, in lateral view median lobe with dorsal margin straight, apex angularly rounded; parameres in dorsal view with lateral margins very weakly laterally expanded in apical 1/2, apically broadly rounded.

Female (Fig. 24A-B). Size: 12.3-13.7 mm. Body form regularly elongate oval; elytral apices spinose, with sutural angle produce to a spine, and a second parasutural spine, with small thorn-like serrations and irregularities present apically but greatly reduced apicolaterally, apicolateral sinuation present and shallow, elytra with reticulation strong laterally and apically, producing a bronzy appearance, medial disc with reticulation more weakly impressed and composed of smaller transversely ovoid cells accompanied by very shallowly impressed punctation, striae mostly effaced by reticulation, if evident at all faintly apparent medially on disc, lateral marginal depression of elytra absent; protibiae club-shaped; profemora without sub-apicoventral tooth; metacoxae with a sparse covering of very shallow punctures over most their ventral face, laterally only present on posterior margin; venter lightly colored: reddish orange to orangey yellow.

Differential diagnosis.

Dineutus longimanus longimanus is unique among other subspecies of Dineutus longimanus in being elongate oval and broadened posteriorly in the male after basal half of elytra, and having the metacoxae with sparse but present punctation. The subspecies most similar to Dineutus longimanus longimanus is Dineutus longimanus portoricensis but can be distinguished from Dineutus longimanus portoricensis in being smaller in size (12.3-13.9 mm) and the aedeagus lacking a dorsal carina.

Distribution

(Fig. 55B). Haiti, Dominican Republic, ( Leng and Mutchler 1914a; Ochs 1938; Wood 1962)

Habitat.

Lotic species collected in streams throughout the Dominican Republic (M. Fikáček pers. comm.).

Discussion.

Similar to other species not much is known about this species aside from its taxonomy. The extant of range of this and other subspecies of Dineutus longimanus may be obscured due to imprecise identification of subspecies.

Type designation.

Olivier (1795) in his original description of Gyrinus longimanus states it is found in St. Domingue and was described from the cabinet of M. Bosc. A single specimen in the MNHN general collection has a label indicating both the aforementioned locality and being from Bosc’s collection, as well as a label in the handwriting of Olivier with the I.D. of Gyrinus longimanus , therefore this specimen (Fig. 51E) is here designated as the lectotype for Dineutus longimanus longimanus .