Pachyforma, García & Vlasak, 2024

García, Kimberly & Vlasak, Josef, 2024, A new genus and species of Anisocerini (Coleoptera: Cerambycidae) from Ecuador, Zootaxa 5424 (5), pp. 595-600 : 596-598

Pachyforma gen. nov.

( Fig. 1–5 )

Type species. Pachyforma rosacea sp. nov., here designated.

Etymology

The generic name Pachyforma is derived from the Greek “pachy-” (παχύς) meaning stout and from the Latin “- form” meaning shape and refers to the stout body of the beetle. Feminine gender.

Description

Head parallel-sided behind eyes; sparsely, coarsely punctate between upper eye lobes. Median groove well marked between antennal tubercles. Antennal tubercles slightly elevated; widely separated. Eyes finely faceted, coplanar with surface around them; upper eye lobes widely separated; lower eye lobes distinctly smaller than length of genae. Genae wide, with irregular apex. Labrum and clypeus small. Mandibles robust, with acute apex. Maxillary palpi longer than labial palpi. Antennae 11-segmented, longer than body in females; scape clavate, shorter than antennomere III; pedicel small, constricted on anterior margin; antennomere III longer than IV, with apex strongly dilated towards inner margin; antennomere IV longer than V, with apex slightly dilated towards inner margin; antennomeres V–X gradually decreasing in length. Prothorax transverse; lateral margin with strong, conical tubercles, acute apically. Prosternal process wide, subparallel-sided in middle, expanded at apex, apex truncate. Mesoventrite tumid. Mesoventral process slightly emarginate at apex. Metaventrite transverse, notably wider than long, parallel-sided. Scutellum convergent on anterior third, parallel-sided in middle, rounded toward apex, apex truncate. Elytra parallel-sided on anterior 2/3, rounded on posterior 1/3; humeri rounded; centro-basal tubercles strongly elevated; surface coarsely punctate on anterior half, especially on tubercles and humeri. Femora clavate. Tibiae slightly widened toward apex. Ventrite 5 of females tumid, with anterior median sulcus, apex truncate, with semicircular depression on apex.

Differential diagnosis

Pachyforma gen. nov. is allocated in Anisocerini because it has the diagnostic characteristics of the tribe provided by Thomson (1860): body short, round-shaped; head wide, frons long and flat; scape clavate, antennomeres III– IV dilated; prothorax with lateral spines; femora and tibiae clavate and pedunculate; tarsi short and robust ( Figs. 1–5 ). Among the genera of Anisocerini , Pachyforma gen. nov. is similar to Caciomorpha Thomson, 1864 and Phacellocerina Lane, 1964 .

Pachyforma gen. nov. resembles Caciomorpha by body parallel-sided; scape robust, long and clavate; antennomere III long, robust, with dilated apex on internal margin; prothorax with lateral tubercles; and elytral apices rounded. Pachyforma gen. nov. differs from Caciomorpha by having antennomere IV slightly dilated at apex; prothorax notably wider than long, with strong, conical lateral tubercles; centro-basal gibbosities of elytra strongly elevated; body overall robust ( Figs. 1–3 ). In Caciomorpha antennomere IV is cylindrical; prothorax slightly wider than long, with lateral tubercles poorly developed; centro-basal gibbosities of elytra barely elevated; body overall slender. Pachyforma gen. nov. is also similar to Phacellocerina by having apex of antennomere III dilated; prothorax wider than long, with strong, conical lateral tubercles; centro-basal gibbosity of elytra strongly elevated; body overall robust. Pachyforma gen. nov. can be distinguished from Phacellocerina by scape more robust; antennomere IV slightly dilated at apex; prothorax with gibbosities barely elevated; apex of elytra without protuberances ( Figs. 1–3 ). In Phacellocerina the scape is slender; antennomere IV cylindrical; prothorax with gibbosities strongly elevated; apex of elytra with protuberances covered with tufts of erect setae.

Key to genera of Anisocerini similar to Pachyforma gen. nov. (modified and translated from Galileo & Martins, 1998):

1. Mesoventral process without tubercles; lateral tubercles of prothorax evident, well-visible........................... 2

- Mesoventral process with two tubercles; lateral tubercles of prothorax small...................... Satipoella Lane, 1964

2. Antennomere III with internal spine on apex; ventrite 5 of females not modified............... Acanthotritus White, 1855

- Antennomere III without spine, with or without dilation on inner margin of apex; ventrite 5 of females long, tumid, with apical depression........................................................................................... 3

3. Each elytron with two gibbosities; one centro-basal, another on the apical fifth..................................... 4

- Each elytron with one centro-basal gibbosity only........................................................... 5

4. Apex of antennomere IV dilated, covered with erect setae; antennomere V of males with small spicule on inner margin of apex........................................................................... Phacellocera Laporte, 1840

- Apex of antennomere IV without modifications; antennomere V of males without spicules...... Phacellocerina Lane, 1964

5. Centro-basal gibbosity of elytra barely elevated...................................... Caciomorpha Thomson, 1964

- Centro-basal gibbosity of elytra strongly elevated, forming evident tubercle...................... Pachyforma gen. nov.

Figures

FIGURES 1–5. Pachyforma rosacea gen. nov., sp. nov. Holotype female. 1. Dorsal view; 2. Ventral view; 3. Lateral view; 4. Frontal view; 5. Details in of head and prothorax in oblique view.