Crematogaster rochai Forel

Wild, A. L., 2007, A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)., Zootaxa 1622, pp. 1-55: 52

publication ID

21367

publication LSID

lsid:zoobank.org:pub:B08DA0DB-EEC0-4ED3-9FBE-59328B034102

persistent identifier

http://treatment.plazi.org/id/DAE1ADFA-CF4E-F213-16C2-468C5272C5A7

treatment provided by

Thomas

scientific name

Crematogaster rochai Forel
status

 

Crematogaster rochai Forel  HNS  1903.

Crematogaster rochai Forel  HNS  1903: 255. [w syntypes examined, MHNG; Ceará, Brazil, (Rocha)] 

Crematogaster brevispinosa r. rochai Forel  HNS  . Forel 1912c: 213.

Crematogaster (Orthocrema) brevispinosa st. malevolens Santschi  HNS  1919: 41. NEW SYNONYMY. [w syntypes examined, NHMB; Nueva Pompeya , Chaco, Argentina (Joergensen)]  .

Crematogaster (Orthocrema) brevispinosa subsp. rochai Forel  HNS  . Emery 1924a: 134.

Crematogaster (Orthocrema) brevispinosa rochai Forel  HNS  . Kempf 1972: 86.

Crematogaster (Crematogaster) rochai Forel  HNS  . Longino 2003: 102.

Crematogaster (Crematogaster) malevolens Santschi  HNS  . Longino 2003: 131. Raised to species.

Crematogaster rochai  HNS  can be diagnosed by the following combination of characters: antennal scapes short, less than.8x head length, in repose failing to reach posterior margin of head in full-face view; dorsal surface of head largely devoid of erect setae; promesonotum slightly arched in profile; propodeal suture present but not deep; postero-dorsal face of propodeum forming a single concave slope, not broken into distinct dorsal and posterior faces; propodeal spines short and upturned; first gastric tergite (= abd. tergite 4) with <6 standing setae exclusive of posterior row.

Mature colonies in the Crematogaster crinosa  HNS  complex, including C. rochai  HNS  , are polymorphic in the worker caste and occasionally produce rather large workers. Santschi’s C. malevolens  HNS  seems to be little other than a large C. rochai  HNS  . I can find no consistent characters to separate C. malevolens  HNS  from the C. rochai  HNS  type or from Paraguayan material that Jack Longino has identified as C. rochai  HNS  . Longino (2003) elevated C. malevolens  HNS  to species with the intent to clear trinomials from the C. crinosa  HNS  complex but did not provide additional reasoning. If C. malevolans  HNS  is indeed conspecific with what I call C. rochai  HNS  in Paraguay, an alternate resolution would be to split these southern populations off from C. rochai  HNS  under the name C. malevolens  HNS  . Specimens from southern South America are more pilose and bear a stronger propodeal suture than more northerly material Longino (2003), character states that apply equally to C. malevolens  HNS  . Considering the allopatric nature of the variation, however, I prefer to retain a single species.

MHNG

Switzerland, Geneva, Museum d'Histoire Naturelle

NHMB

Switzerland, Basel, Naturhistorisches Museum