Iviephengus, Roza, 2023
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publication ID |
https://doi.org/ 10.5852/ejt.2023.864.2087 |
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publication LSID |
lsid:zoobank.org:pub:05ED98F7-DEC6-4285-A7CE-2F1CE3D4DEDE |
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DOI |
https://doi.org/10.5281/zenodo.7818078 |
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persistent identifier |
https://treatment.plazi.org/id/8E421AB8-7EE1-4492-92A8-2D74E89A462A |
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taxon LSID |
lsid:zoobank.org:act:8E421AB8-7EE1-4492-92A8-2D74E89A462A |
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treatment provided by |
Felipe |
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scientific name |
Iviephengus |
| status |
gen. nov. |
Genus Iviephengus gen. nov.
urn:lsid:zoobank.org:act:8E421AB8-7EE1-4492-92A8-2D74E89A462A
Figs 1–5 View Fig View Fig View Fig View Fig View Fig
Type species
Iviephengus ferreirai gen. et sp. nov., here designated.
Diagnosis
Interantennal distance close to 3× the antennal socket length ( Figs 1D View Fig , 2A View Fig ); antenna 12-segmented, IV to XI each with two long symmetrical compressed and apically slightly enlarged branches, longer than respective antennomere ( Fig. 2G View Fig ); labrum fused to frontoclypeus ( Fig. 2A View Fig ); mandible short, not projecting and obliquely crossed, each with a notch on the external margin to fit the other mandible and without extra teeth ( Fig. 2H–I View Fig ); maxillary palpi 4-segmented, last segment digitiform ( Fig. 2J View Fig ); labial palpi 2-segmented ( Fig. 2K View Fig ); posterior tentorial pit consisting of a single small fossa ( Fig. 2B View Fig ); elytron around 2.5× longer than wide, slightly convergent posteriorly and slightly thickened apically ( Fig. 1A View Fig ); wing with radial cell closed and transverse, vein r4 interrupted, r3 absent ( Fig. 1E View Fig ); first tarsomere of pro- and mesotarsus with a ventral comb covering the posterior half of the tarsomere ( Fig. 3A–B View Fig ); claws simple, without any teeth ( Fig. 3C View Fig ); aedeagus with paramere symmetrical, apex unevenly round, toothed inward, with short and sparse bristles ( Fig. 4D, G–H View Fig ).
Etymology
The name is in honour of the entomologist Michael Ivie, a great Coleoptera researcher who has contributed largely to the knowledge of world beetles, including phengodids, with a major focus on morphology and taxonomy. Michael kindly received me during my visit to the Montana State University and allowed the loan of several Phengodidae specimens. The suffix phengus is found in several Phengodidae genera. Singular genitive, masculine.
Description
Male
HEAD ( Figs 1D View Fig , 2 View Fig ). Head wider than long, with posterior margin subparallel, slightly convergent posteriorly, usually covered by pronotum, as wide as the pronotum; antenna slightly longer than elytron; 12-segmented, antennomeres IV–XI with two symmetrical compressed and apically slightly enlarged branches, longer than respective antennomere ( Fig. 2G View Fig ); eyes moderately protruding, finely faceted ( Fig. 2A–F View Fig ), frontoclypeus with a declivity between the antennae before labrum, interantennal space close to 3 × antennal socket width; labrum small, fused with frontoclypeus but with vestigial lateral sutures, bilobate ( Fig. 2A View Fig ); mandibles moderately long, continuously tapered towards the apex, around 4× longer than basal width, slightly projected and obliquely crossed, with an external notch to fit the other mandible ( Fig. 2H–I View Fig ); maxilla with palpi 4-segmented, last palpomere digitiform, palpifer distinct, galea distinct, extremely short and free, highly setose, lacinia almost fused with the stipe, highly setose, cardo semitriangular, 2× as wide as long ( Fig. 2J View Fig ); labium with palpi 2-segmented, short, not covered by mandibles, last palpomere digitiform, ligula absent, prementum oval, palpiger absent, mentum and submentum fused in a single piece, which is fused with the head ( Fig. 2K View Fig ); one gular suture, tentorial pit with single fossa ( Fig. 2B View Fig ).
THORAX ( Figs 1A–D View Fig , 3 View Fig ). Pronotum trapezoidal, slightly wider than long, anterior angles dorsally concave, rounded, lateral margins subparallel, laterally curved down in the anterior angles ( Fig. 1D View Fig ); elytron surpassing the fourth abdominal segment, around 2.5× as long as wide, wider in anterior half, slightly convergent posteriorly, subparallel, apex slightly swollen ( Fig. 1A View Fig ); posterior wings with radial cell closed, moderately elongated and transverse, around 2.5 × as wide as long, r4 interrupted both in the radial cell and RP, r3 absent, RP reaching one third of MP1+2 length, medial field containing five main veins: MP3, MP4, CAS and AA4; CuA1 and CuA2 absent, anal lobe well developed, AP3+4 long, J absent ( Fig. 1E View Fig ); legs increasing in length from proleg to metaleg, pro- and mesotarsomere I with a ventral comb covering the posterior half of the tarsomere ( Fig. 3A–B View Fig ), protarsomere I 2× as long as II, II–IV decreasing in length, tarsomere IV of all legs with ½ V length, claws simple, without any teeth ( Fig. 3C View Fig ).
ABDOMEN ( Fig. 4 View Fig ). Subparallel, tergites and ventrites extremely transverse, around 3–4 × as wide as long, slightly increasing in length from the first to the last, tergite VIII as wide as long; tergites with anterior margin slightly emarginate, lateral margins subparallel, posterior margin straight to slightly rounded ( Fig. 4A View Fig ); tergite IX transverse, with a membranous division in the middle, anterior margin oblique inward, posterior margin curved inwards; tergite X short, conical, lateral margins subparallel ( Fig. 4E View Fig ); sternites each with anterior margin straight, lateral margins subparallel, posterior margin straight to slightly rounded ( Fig. 4B View Fig ), sternite VIII with a membranous, densely setose projection on anterior margin ( Fig. 4C View Fig ), sternite IX elongate, posterior margin slightly emarginate ( Fig. 4F View Fig ); aedeagus trilobed, basal piece attached to the median lobe, feebly sclerotized, and shaped as a ribbon-like stripe, median lobe cylindrical, strongly curved at base, rounded apically; flagellum encircled around median lobe at rest; about 2 × as long as median lobe length; parameres symmetrical, narrowing slightly past the middle towards the apex, which is truncate, toothed inward, with short and sparse bristles ( Fig. 4D, G–H View Fig ).
Female and immature stages
Unknown.
Biology and distribution
No specimens of Iviephengus gen. nov. were seen alive, so there is no data regarding their habits. The genus is only known to occur in the Peruvian Amazon. All specimens were collected in March, the end of the summer in the southern hemisphere.
Remarks
Iviephengus gen. nov. can easily be separated from most of the genera of Mastinocerinae by the presence of a ventral comb in the pro- and mesotarsomere I. When compared with other genera with combs on pro- and mesotarsomere I, it can be separated from all of them, with the exception of Cephalophrixothrix Wittmer, 1976 , by the comb covering half of the ventral pro- and mesotarsomere I (vs covering the entire ventral pro- and mesotarsomere I in the other genera). It can be differentiated from Cephalophrixothrix by the mandible with a notch on the external margin to fit the other mandible (vs without a notch in Cephalophrixothrix ), the labial palpi with two palpomeres (vs three in Cephalophrixothrix ), and the tarsomere II half the length of tarsomere I (vs subequal to tarsomere I length in Cephalophrixothrix ).
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