Probolomyrmex

Eguchi, K., Yoshimura, M. & Yamane, S., 2006, The Oriental species of the ant genus Probolomyrmex (Insecta: Hymenoptera: Formicidae: Proceratiinae)., Zootaxa 1376, pp. 1-35: 33-34

publication ID

21149

persistent identifier

http://treatment.plazi.org/id/323C3CB8-B47B-00C5-D818-640F943A298E

treatment provided by

Christiana

scientific name

Probolomyrmex
status

 

[[ The Oriental species of the ant genus Probolomyrmex  HNS  ]]

Discussion

Two species groups, the longinodus  HNS  group and the greavesi  HNS  group, can be recognized based on worker morphology among ten Oriental species and two Australian species that are dealt with or discussed in the present study. The longinodus  HNS  group is characterized by the petiole which is clearly longer than high, and subpetiolar process which is low with poorly developed posteroventral portion. Probolomyrmex dammermani  HNS  , P. itoi  HNS  , P. longinodus  HNS  , P. longiscapus  HNS  , P. procne  HNS  and P. watanabei  HNS  are included here. They are separated from each other by SI, LPtI, development of propodeal spine, shape of posterodorsal portion of petiole, and/or shape of abdominal segment III in profile. The greavesi  HNS  group is characterized by the petiole which is at most a little longer than high, and subpetiolar process which is developed and somewhat rectangular. Probolomyrmex bidens  HNS  , P. greavesi  HNS  , P. maryatiae  HNS  , P. okinawensis  HNS  , P. salomonis  HNS  and P. vieti  HNS  belong to this species group. Probolomyrmex bidens  HNS  , in which the petiolar node has paired teeth posterodorsally, and P. okinawensis  HNS  , in which the posteroventral portion of subpetiolar process forms an obtuse angle only, are relatively well distinguished from the other members of the greavesi  HNS  group. On the other hand, P. greavesi  HNS  , P. maryatiae  HNS  , P. salomonis  HNS  and P. vieti  HNS  are only barely separated from each other based on worker morphology (see under P. maryatiae  HNS  and P. vieti  HNS  ). There are two possible views for this morphological similarity: they are geographical variants of a single variable species ranging from Indo-China to Australia and Solomon, or biological species with slight morphological differentiation. However, male morphology strongly supports the separation of P. greavesi  HNS  from P. vieti  HNS  at species level. Although more information is needed particularly for male characters of the other forms, we have inclined to the second view and described P. maryatiae  HNS  and P. vieti  HNS  as sibling species of P. salomonis  HNS  and P. greavesi  HNS  .

Male morphology supports the recognition of the two species groups. In the male of the longinodus  HNS  group ( P. dammermani  HNS  , P. longinodus  HNS  and P. longiscapus  HNS  ), the protrusion of the frontoclypeal region is relatively long, so that antennal insertion is situated in the middle of its dorsal surface; the third antennal segment is distinctly longer than the second; Mf1, Rs+M and media apical to Rs+M are present; cu-a cross vein is present; petiolar node is long and has a gentle anterior slope; median portion of the ninth abdominal sternum is strongly and roundly expanded apicad; genitalia are retractile. On the other hand, in the male of the greavesi  HNS  group ( P vieti  HNS  ), the protrusion of the frontoclypeal region is relatively short, so that antennal insertion is situated in apical portion of its dorsal surface; the third antennal segment is shorter than the second; Mf1, Rs+M and media apical to Rs+M are completely absent; cu-a cross vein is absent; petiolar node is very short and has a steep anterior slope; median portion of the ninth abdominal sternum is moderately expanded apicad and has an almost straight apical margin; genitalia are not retractile.