Dineutus longimanus jamaicensis Ochs, 1938

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 : 48-51

Dineutus longimanus jamaicensis Ochs, 1938 Figures 22, 23, 55

Dineutus (Dineutus) longimanus jamaicensis Ochs 1938: 88, Dineutus longimanus jamaicensis : Blackwelder 1944: 81, Dineutus (Rhombodineutus) longimanus : Guignot 1950: 127, Dineutus (Cyclinus) longimanus : Brinck 1955: 106.

Type locality.

Blue Mountains, Jamaica, near 4500 ft. MCZ Type No. 23058.

Specimens examined.

4

Type material examined.

Holotype (♂, pinned) "Blue Mts./ nr 4500 ft./ Aug. 13-20 [white label, typed black ink]// Jamaica/ 1934/ Darlington [white label, typed black ink]// 23058/ M.C.Z./ HoloType/ jamaicus / ochs [red label, 23058, Holo, and jamaicus Ochs, handwritten in black ink, rest typed black ink]// Dineutus longimanus ssp. jamaicus / Ochs/ 1937/ Type! [white label handwritten in black ink, handwriting appears to be Ochs’]// Dineutus longimanus / jamaicus / Ochs/ 1937/ type no. 23058 [white label handwritten in black ink and type no. 23058 in pencil, handwriting appears to be Ochs’]//” deposited in the MCZ.

Material examined.

JAMAICA: St. Andrew Parish: Maryland, Mamme River, 1.viii.1985, leg. M. Barrett, in clear stream (3 ex. FSCA).

Diagnosis.

Male (Fig. 22C-D). Size: 12.1-13.3 mm. Body form regularly elongate oval; elytral apices spinose, with sutural angle produce to a spine, and a second parasutural spine, with thorn-like serrations and irregularities present apically and apicolaterally, apicolateral sinuation mostly absent, elytra with reticulation strong laterally and apically, producing a bronzy appearance, medial disc with reticulation very weakly impressed and composed of smaller irregularly more transversely shaped 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; profemora with very small sub-apicoventral tooth; protibiae club-shaped; mesotarsal claws (Fig. 23C) with ventral margin regularly rounded and evenly narrowed apically; metacoxae with a decent covering of shallow punctures over most their ventral face, laterally only present on posterior half; venter lightly colored: reddish brown to reddish orange. Aedeagus (Figs 23A, B, D) with median lobe in dorsal view shorter than parameres, parallel sided, in apical 1/4 shallowly narrowed towards apex, apex regularly rounded, dorsally without narrow carina, ventrally sperm-groove narrow and parallel sided for most its length, apically briefly widened, in lateral view median lobe with dorsal margin straight, apex broadly rounded; parameres in dorsal view with lateral margins not noticeably laterally expanded, but very weakly sinuate medially, apically narrowly rounded.

Female (Fig. 22A-B). Size: 12.05 mm. Body form regularly elongate oval; elytral apices spinose, with sutural angle produce to a spine, and a second parasutural spine, with thorn-like serrations and irregularities present apically and apicolaterally, apicolateral sinuation mostly absent, elytra with reticulation strong laterally and apically, producing a bronzy appearance, medial disc with reticulation very weakly impressed and composed of smaller irregularly more transversely shaped 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 decent covering of shallow punctures over most their ventral face, laterally only present on posterior half; venter lightly colored: reddish brown to reddish orange.

Differential diagnosis.

Dineutus longimanus jamaicensis is unique among the other subspecies of Dineutus longimanus in being larger in size (12.05-13.3 mm) and elongate oval in shape without apicolateral sinuation, and having the metacoxae with numerous shallow punctures covering most of their surface. The subspecies most similar to Dineutus longimanus jamaicensis is Dineutus longimanus cubensis and can be distinguished by the differences in dorsal punctation and metacoxal punctation provided in the key.

Distribution

(Fig. 55B). Jamaica ( Leng and Mutchler 1914b; Ochs 1938)

Habitat.

Specimen label data indicate this is a lotic subspecies, with specimens collected from the Mammee river in St. Andrew, Jamaica (FSCA).

Discussion.

Similar to Dineutus longimanus cubensis not much is known about Dineutus longimanus jamaicensis aside from its taxonomy. It is currently only known from Jamaica.