Lasiini, Ashmead, 1905
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publication ID |
https://doi.org/ 10.1111/syen.12522 |
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DOI |
https://doi.org/10.5281/zenodo.6303226 |
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persistent identifier |
https://treatment.plazi.org/id/03B987A9-4367-FF97-FF54-FEC2FB62DE5C |
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treatment provided by |
Tatiana |
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scientific name |
Lasiini |
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Key to extant genera of Lasiini View in CoL and primary clades of Lasius (workers)
1. Antenna with eight antennomeres. Mesonotum, metanotum, and propodeum more-or-less continuous, and metanotum undifferentiated ( Fig. 6A View Fig ). Propodeal spiracle distinctly situated in dorsal third of propodeum. Frontal carinae inconspicuous, being extremely short (<0.5 × anteroposterior antennal torulus diameter) or absent .............................................. ... Cladomyrma View in CoL ( seeAgosti, 1991; Agosti etal., 1999).
– Antenna with 11 or 12 antennomeres. Mesonotum, metanotum, and/or propodeum discontinuous, and metanotum differentiated ( Fig. 6A–G, I–L View Fig ), rarely mesosomal dorsum continuous and metanotum undifferentiated (few Paraparatrechina) ( Fig. 6H View Fig ). Propodeal spiracle situated somewhat below or above midheight of propodeum, but not in dorsal third. Frontal carinae conspicuous (≥1.0 × anteroposterior antennal torulus diameter) .................... .................... 2
2. Petiole posteriorly elongated. Node reduced, apex not or barely projecting dorsally above metapleural gland when observed in profile view ( Fig. 6F–L View Fig ). Abdominal tergum IV with anterolateral corners directed anterodorsally from helcium and forming lateral margins of concavity, which receives entire posterior region of petiole when gaster raised ( Fig. 7A View Fig ); petiole largely obscured by abdominal tergum IV in dorsal view. Facial region between antennal toruli flat, effaced frontal carinae not raised above toruli ( Fig. 7C View Fig )........................... Prenolepis View in CoL genus group (see LaPolla etal., 2012; LaPolla & Fisher, 2014).
– Petiole without posterior elongation. Node squamiform, not reduced, apex projecting dorsally above metapleural gland when observed in profile view ( Fig. 6B–E View Fig ). Abdominal tergum IV with anterolateral corners weakly or not raised anterodorsally from helcium, corners not forming lateral margins of concavity and not concealing entire posterior region of petiole when gaster raised ( Fig. 7B View Fig ); petiole visible in dorsal view, not obscured by abdominal tergum IV. Facial region between antennal toruli bulging to concave, frontal carinae raised above toruli ( Fig. 7D View Fig ) .......................................... 3
3. Eyes situated in anterior half of head as measured in full-face view ( Fig. 10A View Fig ). Metapleural gland orifice reduced, with opening directed posteriorly. Propodeal spiracle situated in lower half of propodeum in profile view. Antennomere III broader than long. Hypostoma lacking carina along lateral margins ................... ......................... Metalasius gen.nov. (notall states observable for † M. pumilus comb. nov., see below).
– Eyes situated in posterior half of head as measured in full-face view ( Fig. 9 View Fig ). Metapleural gland orifice small to very large, opening laterally as well as posteriorly. Propodeal spiracle situated at or above midheight of propodeum in profile view. Antennomere III usually longer than broad. Hypostoma with carina along lateral margins ...................... 4 ( Lasius View in CoL genus group).
4. Maxillary palpomeres III and IV strongly flattened and greatly elongated, length of each exceeds length of apical antennomere. Ventral surface of head with psammophore, that is, margined by long setae ( Fig. 6D View Fig ). Mesothorax and metathorax elongated, mesonotum meeting metanotum at very low angle ( Fig. 6D View Fig ). Compound eyes set at or near extreme posterior margin of head in full-face view; eyes often separated from this border by <1 eye diameter .................................. ............ Myrmecocystus View in CoL (see Snelling, 1976, 1982).
– Maxillary palpomeres III and IV circular to elliptical in cross-section and not elongated, length of each is less than length of apical antennomere. Ventral surface of head without psammophore ( Fig. 6B, C View Fig ). Mesothorax not elongated and metathorax very rarely elongated, mesonotum usually meeting metanotum at steep angle ( Fig. 6B, C View Fig ). Compound eyes set further away from posterior head margin in full-face view; eyes usually separated from this border by> 1 eye diameter.................................. 5 ( Lasius View in CoL ).
5. Metapleural gland enlarged internally, atrium (internal chamber of gland) bulging (forming bulla) and conspicuously visible from external view in profile ( Fig. 7E View Fig )*. Usually, distance between atrium and propodeal spiracle <2 spiracular diameters as viewed with spiracle and gland in same plane of focus ( Fig. 7E View Fig ). Compound eyes usually somewhat- to very-reduced; if compound eye large, then offset basal tooth present on mandible and body yellowish brown........................................... ................................ Lasiusflavus View in CoL clade.
– Metapleural gland small, atrium flat to concave, inconspicuous from external view in profile ( Fig. 7F View Fig ). Usually, distance between atrium and propodeal spiracle> 2 spiracular diameters as viewed with spiracle and gland in same plane of focus ( Fig. 7F View Fig ). Compound eyes relatively large and offset basal tooth absent; if offset basal tooth present, then body jet black ............................. Lasiusniger View in CoL clade.
*Note: The enlarged state of the metapleural gland bulla is a defining synapomorphy of the flavus clade. Aslightly enlarged bulla is observable in the fuliginosus species group, but these jet-coloured ants are otherwise highly distinct.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.