Necrosciinae sp. "Tam Dao"
(by Bruno Kneubuehler) 

 

OrderPhasmatodea
 
SuborderVerophasmatodea 
InfraorderAnareolatae 
FamilyDiapheromeridaeKirby, 1904
SubfamilyNecrosciinaeBrunner v. Wattenwyl, 1893
Genus not yet identified
SpeciesNecrosciinae sp. "Tam Dao"not yet identified

 

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General Notes

  • 2012 – taxonomical aspects of this species are being examined by
             Joachim Bresseel (Belgium)
  • 2012 – first successful culture by Bruno Kneubuehler (Switzerland)
  • 2012 – has been distributed as Necrosciinae sp. „Tam Dao“

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Origin

  • Joachim Bresseel (Belgium) and Jérôme Constant (RBINS) found this species in July 2011 in Tam Dao, Vietnam (No. 67, "Necrosciinae flat long wings", Vietnam 2011)

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Females

  • hindwings (alae) are very unusually shaped. These are angled laterally (see photos)
  • the strutted posture of the hindwings is also uncommon. At first sight they appear to be underdevelopped, but all females have this, even the wild-caught ones
  • the shape of wings give the females a rather flat appearance
  • about 8.5 – 9 cm
  • coloration amongst females is very consistent
  • head, antennae, body and legs are mainly bright green
  • orange stripe alongside (laterally) the pro- and mesothorax
  • white-black stripe alongside (laterally) the forewings (tegmina)
  • fine yellow-black stripe alongside (laterally) the hindwings (alae)
  • upper and lower surface of the thorax is strongly granulated
  • antennae a bit longer than the forelegs
  • the membranous part of the hindwings (anal region of the alae) is yellowish and transparent, with yellow veins

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Males

  • colorful, typical phasmids
  • about 7.5 – 8 cm long
  • coloration is very consistent amongst males
  • head, thorax, upperside of the wings and upper side of the abdomen is mainly bright green
  • white stripe across the eyes
  • black-blue stripe alongside (laterally) pro- und mesothorax
  • white-black-orange stripe alongside (laterally) the forewings (alae)
  • lateral area of hindwings (tegminae) is orange
  • lower side of abdomen is orange-brown
  • the dark colored antennae are considerably longer than the forelegs
  • the membranous part of the hindwings (anal region of the alae) is transparent, with yellow veins

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Nymphs

  • lenght (L1) about 14 mm
  • coloration (L1) is green
  • black cerci and dark antennae tips
  • by L4 it is quite easy to draw a distinction between ♀♂ (by the naked eye)

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Eggs

  • about 2.5 x 2 mm
  • reddish-brown
  • hairy
  • roundish
  • glossy
  • distinct capitulum and lid (operculum)
  • micropylar plate with clearly visible micropylar pore

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Food Plants

  • Hypericum
    is very well accepted by freshly hatched nymphs, older nymphs and adults
  • hazelnut (Corylus avellana)
    is very well accepted by older nymphs and adults (has not been tested with freshly hatched nymphs). Hazelnut leaves appear very early in spring, so it is a great alternative to hypericum
  • bay laurel (Laurus nobilis)

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Behaviour

  • if being touched, especially small nymphs behave very hectically. But usually the freeze again after a few steps
  • otherwise nymphs as well as adults are rather passive during the day
  • males can fly, but their flight is short and they can not fly upwards
  • is seems that females can not fly, even though they are fully winged
  • matings are mainly during the night and last for some hours at the most
  • males do not stay with the same female for a prolonged time

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Developement

  • incubation time (HH-incubation on slightly damp sand at 20 - 23 °C) is about 5 – 5.5 months (F1)
  • spread some dry (!) moss over the eggs - this will make it much easier for the nymphs to hatch unscathed and it also reduces mould growth to some extend
  • hatching ratio (F1) was high (> 50%)
  • males will be adult after about 2.5 months (at 20 – 23°C), females after about 3 months
  • females start to lay eggs after about 2 – 3 weeks
  • eggs just drop to the ground
  • about 25 – 30 eggs per female and week
  • adults can live for several months

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Breeding Notes

  • it is very easy to breed this species, if the food plants are available
  • keep the nymphs in a cage with good ventilation, but take care that the humidity does not drop too low
  • a constantly wet paper towel on the floor of the cage helps raising humidity
  • a humidity level of about 60 – 65 % rH seems to be sufficient
  • nymphs can be kept in a Faunabox (or similar cages)
  • move nymphs to a bigger cage as they grow bigger
  • a cage of 30 x 30 x 30 cm should be provided for some couples of this species (or considerably larger if the cage also contains other species !)
  • generally I advise to keep different phasmid species seperately (unfortunately, overcrowed cages are still very common ...)
  • I have never sprayed nymphs or adults (or their cage) with water
  • make shure that nymphs, which are about to undergo their adult moult, do not find places in the cage which would not offer them enough space beneath to moult successfully

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References

  • Phasmida Species Files  (www.phasmida.orthoptera.org)



 

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direct link to category: Necrosciinae (Vietnam, Tam Dao)