Dineutus longimanus portoricensis Ochs, 1924

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 : 51-54

Dineutus longimanus portoricensis Ochs, 1924 Figures 26, 27, 55

Dineutus longimanus portoricensis Ochs 1924: 5, Dineutus (Cyclinus) longimanus : Hatch 1925b: 448, Dineutus (Dineutus) longimanus portoricensis : Ochs 1926a: 138, Dineutus longimanus portoricensis : Blackwelder 1944: 81, Dineutus (Rhombodineutus) longimanus : Guignot 1950: 127, Dineutus (Cyclinus) longimanus : Brinck 1955: 106

Type locality.

Puerto Rico, Aibonito.

Specimens examined.

27

Type material examined.

Holotype (♂, pinned, aedeagus pointed to specimen) "Aibonito, P. R., June 1-3, 1915/Amer.Mus.Nat.Hist., Dept. Invert. Zool. No. 28073/HOLOTYPE/ Dineutus longimanus Oliv. subsp. portoricensis Ochs 1924, Typus ♂" AMNH type catalogue No. 434.

Material examined.

PUERTO RICO: "Hwy-31, Km. 15.4 nr. PasoSecoJct.", 122 m, 1.viii.1963, leg. P.J. Spangler, (4 ex. WIBF); Germán: Río Cain, at PR361, 1 rd. mi. N jct. PR396, N of San Germán, 18°07.062'N, 67°01.518'W, 103 m, 14.v.2009, leg. C.B. Barr, EMEC 654754, 654755, 654757 (3 ex. EMEC); Lares: Río Camuy, E off PR134 1.2 rd.mi. N jct. PR111, NE of Lares, 18°18.204'N, 66°49.445'W, 278 m, 16.v.2009, leg. W.D. Shepard, EMEC 654756, 654758, 654759, 654760 (4 ex. EMEC); Maunabo: Río Guayanés, at PR181 just S jct. PR182, N Patillas, 18°03.397'N, 65°59.004'W, 422 m, 9.v.2009, leg. C.B. Barr, EMEC 654749-654753 (5 ex. EMEC); San Patillas: trib. Río Grande de Patillas at PR184, Bosque Carite Charco Azul Rec. Center, 18°05.460'N, 66°02.150'W, 597 m, 10.v.2009, leg. C.B. Barr, EMEC 654746-654748 (3 ex. EMEC); Uatado: trib. Río Caonillas E off PR 612, 2.3 rd. mi. N jct. PR140, NE of Utuado, S Lago dos Bocas, 18°18.177'N, 66°38.708'W, 99 m, 17.v.2009, leg. C.B. Barr, EMEC 654738-654745 (8 ex. EMEC).

Diagnosis.

Male (Fig. 26C-D). Size: 12.3-14.5 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 along with very shallow punctation, striae mostly effaced by reticulation, if evident at all faintly apparent medially on disc, lateral marginal depression of elytra present and accompanied with a green sheen; profemora with very small sub-apicoventral tooth; protibiae club-shaped; mesotarsal claws (Fig. 27C) with ventral margin with a weak denticle; metacoxae with a sparse covering of very shallow punctures that are almost indistinguishable over most their ventral face, laterally only present on posterior margin; venter lightly colored: reddish orange to yellow-orange. Aedeagus (Fig. 27A, B, D) with median lobe in dorsal view just shorter than parameres, broadest basally, becoming narrowed apicad after basal 1/3, then angularly narrowed again in apical 1/3 toward apex, apex narrowly rounded, dorsally with narrow carina, ventrally sperm-groove narrow and parallel sided, in lateral view median lobe with dorsal margin straight, slightly angled ventrally toward apex, apex broadly rounded; parameres in dorsal view with lateral margins not noticeably laterally expanded, apically broadly rounded.

Female (Fig. 26A-B). Size: 11.2-13.4 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 sculpticells along with very shallowly impressed punctation, striae mostly effaced by reticulation, if evident at all faintly apparent medially on disc, lateral marginal depression of elytra present and accompanied with a green sheen; profemora without sub-apicoventral tooth; protibiae club-shaped; metacoxae with a sparse covering of very shallow punctures that are almost indistinguishable over most their ventral face, laterally only present on posterior margin; venter lightly colored: reddish orange to yellow-orange.

Differential diagnosis.

Dineutus longimanus portoricensis can easily be distinguished from other subspecies of Dineutus longimanus in being large in size (11.2-14.5 mm), elytral margin with a lateral green sheen, and most distinctly in the form of the aedeagus. The species most similar to Dineutus longimanus portoricensis is Dineutus longimanus longimanus but can easily be distinguished from it in being larger in size with the lateral marginal depression having a green sheen, and having the aedeagus with a dorsal carina.

Distribution

(Fig. 55B). Puerto Rico ( Leng and Mutchler 1914b; Ochs 1924).

Habitat.

Few specimens included habitat information. One that did, mentions a roadside stream (WIBF). Historical records also indicate this is a lotic subspecies ( Ochs 1924).

Discussion.

Not much is known about this species aside from its taxonomy, and similar to Dineutus longimanus longimanus the true extant of its range is obscured due to imprecise identification of the subspecies.