Necrosciinae sp. "Bach Ma"
(by Bruno Kneubuehler) 

 

OrderPhasmatodea
 
SuborderVerophasmatodea 
InfraorderAnareolatae 
FamilyDiapheromeridaeKirby, 1904
SubfamilyNecrosciinaeBrunner v. Wattenwyl, 1893
Genus not yet specified
SpeciesNecrosciinae sp. "Bach Ma"not yet specified

 

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General Notes

  • 2012 – this species has not been identified yet. But it belongs
             to the same genus as Necrosciinae sp. „Attapeu“ (from Laos)
  • 2012 – first successful culture by Bruno Kneubuhler
  • 2012 – this species has been distributed as Necrosciinae sp. „Bach Ma"

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Origin

  • Joachim Bresseel (Belgium) and Jérôme Constant (RBINS) collected this species in July 2011 in Bach Ma, Vietnam (No. 28, "Oxyartes lamellatus ssp. 2", Vietnam 2011)

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Females

  • inconspicuous, typical phasmids
  • about 12.5 – 13.5 cm long
  • coloration is rather variable amongst females (in F1)
  • basic coloration is a strong green, more or less speckled with dark dots
  • dark stripe on the sides (laterally) of the head, over the eyes
  • eyes are dark
  • antennae longer than forelegs
  • unwinged (apterous)
  • area of the mouth is reddish
  • white or very light stripe on the lateral side of the prothorax (hindmost part) and mesothorax (first half)
  • subgenital plate is brown

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Males

  • also very typical and thin phasmids
  • about 9 – 9.5 cm
  • coloration is rather consistent amongst males
  • dorsal coloration is a strong green
  • ventral coloration is green-brown (thorax area) and brown (abdominal area)
  • knees are dark, almost black
  • a yellow and a dark stripe laterally on the head, over the eyes
  • almost white spots laterally in the hindmost area of pro- and mesothorax
  • almost white spots ventrally in the hindmost area of pro- and mesothorax
  • antennae longer than forelegs
  • unwinged (apterous)

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Nymphs

  • lenght (L1) about 16 mm
  • coloration (L1) speckled with different shades of brown
  • older nymphs are very individually colored – mainly different brown, some with green
  • antennae with white tips
  • by L3 it is quite easy to draw a distinction between ♀♂ (by the naked eye)

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Eggs

  • about 3 x 2 mm
  • grey-brown speckled
  • roundish
  • glossy
  • capitulum is raised slightly, but really very distinct from the operculum
  • a clearly raised Y-like structure on the micropylar plate

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Food Plants

  • bramble (Rubus sp.)
    is very well accepted by freshly hatched nymphs (L1), older nymphs and adults
  • no other food plants have been tested yet

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Behaviour

  • (undisturbed) young and adult specimens are passive during the day
  • older nymphs and adults are usually not on the food plant during the day
  • if being touched, small nymphs (L1) are passive and feign death
  • older nymphs and adults (especially adult males) try to drop to the ground or crawl away, when being touched. But usually they freeze again after just a few steps
  • matings usually occur during the night, and last for some hours at the most
  • males do not stay with the same female for a prolonged period

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Developement

  • incubation time (HH-incubation on slightly damp sand at 20 - 23 °C) is about 3 months (for 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 was very high (> 50%) in F1
  • males will be adult after about 3 months (at 20 – 23°C), females after about 3.5 – 4 months
  • females start laying eggs after about 2 – 3 weeks
  • eggs are flinged away with a sway of the abdomen
  • about 20 – 25 eggs per female and per week
  • adults can live for several months, also the males

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Breeding Notes

  • it is very easy to breed this species
  • 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 is sufficient
  • nymphs can be kept in a Faunabox (or similar cages)
  • move nymphs to a bigger cage as they grow bigger
  • as the adults are rather big, a cage of at least 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 (overcrowed cages are unfortunately still very common ...)
  • I have never sprayed nymphs or adults 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, Bach Ma)