Dineutus longimanus

From Species-ID
Jump to: navigation, search
Notice: This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.

If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly.

This page should be cited as follows (rationale):
Gustafson G, Miller K (2015) The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini). ZooKeys (476) : 1–135, doi. Versioned wiki page: 2017-04-10, version 139051, https://species-id.net/w/index.php?title=Dineutus_longimanus&oldid=139051 , contributors (alphabetical order): Pensoft Publishers.

Citation formats to copy and paste

BibTeX:

@article{Gustafson2015ZooKeys,
author = {Gustafson, Grey T. AND Miller, Kelly B.},
journal = {ZooKeys},
publisher = {Pensoft Publishers},
title = {The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)},
year = {2015},
volume = {},
issue = {476},
pages = {1--135},
doi = {10.3897/zookeys.476.8630},
url = {http://zookeys.pensoft.net/articles.php?id=4577},
note = {Versioned wiki page: 2017-04-10, version 139051, https://species-id.net/w/index.php?title=Dineutus_longimanus&oldid=139051 , contributors (alphabetical order): Pensoft Publishers.}

}

RIS/ Endnote:

TY - JOUR
T1 - The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)
A1 - Gustafson G
A1 - Miller K
Y1 - 2015
JF - ZooKeys
JA -
VL -
IS - 476
UR - http://dx.doi.org/10.3897/zookeys.476.8630
SP - 1
EP - 135
PB - Pensoft Publishers
M1 - Versioned wiki page: 2017-04-10, version 139051, https://species-id.net/w/index.php?title=Dineutus_longimanus&oldid=139051 , contributors (alphabetical order): Pensoft Publishers.

M3 - doi:10.3897/zookeys.476.8630

Wikipedia/ Citizendium:

<ref name="Gustafson2015ZooKeys">{{Citation
| author = Gustafson G, Miller K
| title = The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)
| journal = ZooKeys
| year = 2015
| volume =
| issue = 476
| pages = 1--135
| pmid =
| publisher = Pensoft Publishers
| doi = 10.3897/zookeys.476.8630
| url = http://zookeys.pensoft.net/articles.php?id=4577
| pmc =
| accessdate = 2024-12-23

}} Versioned wiki page: 2017-04-10, version 139051, https://species-id.net/w/index.php?title=Dineutus_longimanus&oldid=139051 , contributors (alphabetical order): Pensoft Publishers.</ref>

See also the citation download page at the journal.


Taxonavigation

Ordo: Coleoptera
Familia: Gyrinidae
Genus: Dineutus

Name

Dineutus longimanus (Olivier, 1791) – Wikispecies link – Pensoft Profile

Differential diagnosis

This is a very unique Dineutus species, easily distinguished from all other New World Dineutus, by the elytral apices possessing a spine located between the sutural and apicolateral angles. Serrations and irregularities are also present, and the sutural angle is also produced into a short spine. The venter is usually more lightly colored from reddish to yellow.

Distribution and subspecies

This species is endemic to the Caribbean and represents a bit of a population genetics and Caribbean biogeography problem. The species is currently divided into four subspecies, with each island of the Greater Antilles having its own subpsieces, with the two most unique subspecies being found at opposite ends of the species distribution (Cuba and Puerto Rico). The two subspecies occupying the middle area of the range (Jamaica and the Dominican Republic) are less distinct and seem to form a gradient between the morphologies of the two subspecies at the opposite ends. The aedeagi of three of the subspecies are very similar with only that of Dineutus longimanus portoricensis offering some significant differences. For these reasons we have decided to retain the classification proposed by Ochs (1924[1], 1926a[2], 1938[3]) in treating the four forms as subspecies. Future genetic work may shed some light on these issues.
Dineutus longimanus can be distinguished from all other North American species of Dineutus in having the elytral apices spinose with serrations and irregularities present. The subspecies can be separated by the following key:

Distribution and subspecies — G. Gustafson , K. Miller
1
Body form of both sexes evenly elongate oval (Figs 20A, C; 22A, C); Elytra with apicolateral sinuation not evident, at most weakly developed, apical serrations strongly developed as small thorns; Mesotarsal claws with ventral margin rounded and evenly narrowed apically, without a denticle (Figs 21C; 23C); Metacoxae with numerous shallow punctures extending on to lateral wings of metacoxae; Median lobe of aedeagus more parallel sided, parameres of aedeagus more narrowly rounded (Fig. 21A; 23A). Western Caribbean 
  2
–
Body form of males more laterally expanded after basal half of elytra (Figs 24C; 26C); Elytra with apicolateral sinuation moderately to strongly evident, apical serrations more weakly developed especially apicolaterally; Mesotarsal claws with a denticle (Figs 25C; 27C); Metacoxae with sparse and very shallowly impressed punctures; Median lobe of aedeagus weakly constricted medially, parameres of aedeagus more broadly rounded (Figs 25A; 26A). Eastern Caribbean 
  3
2
Relatively smaller in size: 10.8–12.9 mm. Reticulation of dorsal surface more well impressed, medial disc reticulation composed of small regularly shaped circular sculpticells; Metacoxae with numerous large, shallow punctures present, extending regularly on to the metacoxal wings. Cuba 
  Dineutus longimanus cubensis
–
Relatively larger: 12.1–13.3 mm. Elytral reticulation much more finely impressed, reticulation of medially disc very weakly impressed composed of irregularly shaped sculpticells which are more transversely oriented; Metacoxae with punctures more shallowly impressed, decreased in number the metacoxal wings, only present on the posterior half. Jamaica 
  Dineutus longimanus jamaicensis
3
Dorsally margin of elytra with lateral greenish sheen; metacoxae with punctures more sparse and more shallowly impressed, barely distinguishable; median lobe of aedeagus with narrow dorsal carina at apex, apically less acuminate and more evenly angled apically. Puerto Rico 
  Dineutus longimanus portoricensis
–
Margin of elytral without lateral greenish sheen; metacoxae with punctures relatively apparent, but still sparse and shallowly impressed; median lobe of aedeagus without dorsal carina, more acuminate apically. Dominican Republic, Haiti 
  Dineutus longimanus longimanus

Taxon Treatment

  • Gustafson, G; Miller, K; 2015: The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini) ZooKeys, (476): 1-135. doi

Images

Figure 20. Dineutus longimanus cubensis. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm.
Figure 20. Dineutus longimanus cubensis. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm. 
Figure 21. Dineutus longimanus cubensis. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm.
Figure 21. Dineutus longimanus cubensis. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm. 
Figure 22. Dineutus longimanus jamaicensis. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm.
Figure 22. Dineutus longimanus jamaicensis. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm. 
Figure 23. Dineutus longimanus jamaicensis. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm.
Figure 23. Dineutus longimanus jamaicensis. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm. 
Figure 24. Dineutus longimanus longimanus. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm.
Figure 24. Dineutus longimanus longimanus. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm. 
Figure 25. Dineutus longimanus longimanus. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm.
Figure 25. Dineutus longimanus longimanus. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm. 
Figure 26. Dineutus longimanus portoricensis. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm.
Figure 26. Dineutus longimanus portoricensis. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm. 
Figure 27. Dineutus longimanus portoricensis. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm.
Figure 27. Dineutus longimanus portoricensis. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm. 

Other References

  1. ↑ Ochs G (1924) On the West Indian Gyrinidae and a new species of Gyretes from northern Brazil. American Museum Novitates 125: 1–8.
  2. ↑ Ochs G (1926a) Die Dineutini. 2. Tribus der Unterfamilien Enhydrinae Fam. Gyrinidae (Col). A. Aligemeiner Teil. Entomologische Zeitschrift 40: 129–140.
  3. ↑ Ochs G (1938) Additional remarks on West Indian Gyrinidae. Psyche 45: 85–93. doi: 10.1155/1938/37837
Retrieved from "https://species-id.net/w/index.php?title=Dineutus_longimanus&oldid=139051"