Eucyclothorax subgen. n., Liebherr, 2018
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publication ID |
https://dx.doi.org/10.3897/dez.65.21000 |
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publication LSID |
lsid:zoobank.org:pub:73DEE0F3-2BB0-4A21-B445-5E168FE50F54 |
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persistent identifier |
https://treatment.plazi.org/id/92B4A6E2-A7B1-BD88-4D17-4D9FE634A14F |
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treatment provided by |
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scientific name |
Eucyclothorax subgen. n. |
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Diagnosis.
Species of this subgenus can be diagnosed by the synapomorphic presence of punctures on the prosternum (Fig. 2D-F View Figure 2 ), and the presence of a distinctly punctate prosternal anteapical groove, or the presence of punctures so deep and large that they obscure any groove (Fig. 2F View Figure 2 ). The pronotal front angles narrow and are not protruded (Fig. 8A View Figure 8 ) in all species except M. curtus and M. nsp. D, in which these angles are little protruded and more rounded (Fig. 2D View Figure 2 ). The paraglossae are generally elongate (Fig. 1D View Figure 1 ), extended twice as far from the anterior margin of the ligula than the distance from their base to the ligular margin; this is reversed in M. punctatus which has shorter paraglossae. The elytral striae are distinctly punctate (Fig. 8A View Figure 8 ), distinguishing Eucyclothorax spp. from species in Qecyclothorax , though not from other Australian members of subgenus Mecyclothorax Mecyclothorax such as M. ambiguus or M. punctipennis . Also, the eighth elytral stria is punctate at midlength in most species (Fig. 2L View Figure 2 )-save M. moorei and M. punctatus -though this punctation is also seen in lesser development in some species of subgenus Mecyclothorax Mecyclothorax such as M. punctipennis . The surface of the basal abdominal ventrites is generally glossy without microsculpture, a synapomorphy, though this is reversed to a microsculptured surface in M. lophoides and M. sp. n. D. In the male genitalia the right paramere is elongate, with only 2-7 setae present on the ventral surface (Fig. 5A View Figure 5 ), and the internal sac bears a dorsal plate as well as a sinuous flagellum (Fig. 4C View Figure 4 ). Finally, the female reproductive tract has the spermathecal duct entering at the juncture of the common oviduct with the bursa (Fig. 6C View Figure 6 ), a symplesiomorphy shared with Qecyclothorax spp. (Fig. 6D View Figure 6 ), some Amblytelus spp. (Fig. 6A-B View Figure 6 ), M. bellorum of subgenus Mecyclothorax Meonochilus ( Liebherr 2011, fig. 12). A helminthoid sclerite is also symplesiomorphically present (Fig. 6C View Figure 6 )
Member species.
All Australian Mecyclothorax species have been examined, with the following species assignable to this subgenus represented in the analysis: M. blackburni , M. curtus , M. eyrensis , M. lophoides , M. moorei , M. peryphoides , and M. punctatus (Table 1 View Table 1 ; Moore et al. 1987, Baehr 2009). Baehr’s (2016) southwestern Australian subspecies M. punctatus peckorum ( Moore 1984, fig. 12) and M. cordicollis (Sloane) complement this list. An undescribed species from Queensland-sp. n. D-will be described in a subsequent publication.
Etymology.
To indicate membership of species of this subgenus in Mecyclothorax , and to reflect the position of this taxon as the adelphotaxon to the remainder of Mecyclothorax sensu lato, the initial syllable “eu” -the Ancient Greek prefix εύ, meaning “proper” or “true” -is combined with the first name proposed for the genus, Cyclothorax ( MacLeay 1871), resulting in the subgenus name Eucyclothorax . Based on the shared nominative masculine terminal syllable thorax, this epithet agrees in gender with the generic epithet.
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