Trachusa (Paraanthidium) Friese, 1898

Kasparek, Max, 2019, A new species in the Trachusa ovata species group (Hymenoptera: Apoidea) from Peninsular Malaysia with an overview of the old-world species within the genus Trachusa, Journal of Natural History 53 (17), pp. 1079-1094 : 1080-1081

Trachusa (Paraanthidium) Friese, 1898

Generic and subgeneric classification

The new species is put into Trachusa Panzer, 1804 based on the combination of characters given in the generic account by Michener (2007), including the following: Pronotal lobe lamellate; upper part of omaulus carinate; posterior part of head well-developed, lateral ocellus nearer to eye (0.74 mm) than to preoccipital margin (0.89 mm) ( Table 1 ); middle tibia nearly as broad as hind tibia (see Table 1 ); vein cu-v of hind wing oblique, half as long as second abscissa of M+ Cu or more; arolia present.

The habitus of the new species is similar to Trachusoides Michener & Griswold, 1994 with its two species T. simplex Michener & Griswold, 1994 , and T. elsieae Michener, 2015 . Among other features (see refined definition of the genus in Griswold 2015), the new species has cleft hind and mid-tarsal claws which places it in Trachusa rather than Trachusoides .

The new species is attributed to the subgenus Trachusa (Paraanthidium) Friese, 1898 based on the following combination of characters (see Michener and Griswold 1994; Michener 2007; Kasparek 2017): second recurrent vein distal to second submarginal crossvein; subantennal suture (slightly) outwardly arcuate; scutellum broadly rounded but medially emarginate; inner margins of eyes parallel. Interocellar Distance (IOD) (0.54 mm), less than Ocelloccipital Distance (OCD) (0.89 mm) ( Table 1 ), but not quite half of it as in the subgeneric definition provided by Michener (2007).

Tables

Table 1. Some measurements of Trachusa ovata and T. tenebrosa sp. n.

	T. ovata	T. ovata	T. tenebrosa sp. n.
Number	SEMC0974791	SEMC1321053	SEMC0974792
Interocellar distance (IOD)	0.51	0.57	0.54
Lateral to middle ocellus distance (LMD)	0.18	0.20	0.20
Middle ocellus diameter (MOD)	0.24	0.27	0.25
Ocellocular distance (OCD)	0.73	0.80	0.74
Ocelloccipital distance (OOD)	0.86	0.91	0.89
%IOD of OOD	69.9	71.3	73.0
Width middle tibia (at widest point)	1.08	1.14	0.98
Width hind tibia (at widest point)	1.15	1.17	1.02
Width of middle tibia to hind tibia (%)	93.9	97.4	96.0