Haliplus (Liaphlus) angustifrons Régimbart, 1892

Sheth, Sayali D., Ghate, Nt. V. & Vondel, Bernhard J., 2016, Illustrated redescription of Haliplus (Liaphlus) arrowi Guignot, 1936 (Coleoptera: Haliplidae) from the Western Ghats, India, and notes on the closely related H. angustifrons Régimbart, 1892, Zootaxa 4127 (2), pp. 355-364 : 361-362

Haliplus (Liaphlus) angustifrons Régimbart, 1892

Known distribution from the Oriental region: India (Punjab; Himachal Pradesh- Simla hills; Jharkhand-Ranchi district (previously in Bihar now in Jharkhand), Hazaribagh district (previously in Bihar now in Jharkhand), Santhal paraganas district (previously in Bihar now in Jharkhand); Kolkata-West Bengal; Odisha (previously Orissa)- Cuttak district, Balasore district, Mayurbanj district; Madhya Pradesh- Jabalpur; Rajasthan- Pilani; Arunachal Pradesh; Maharashtra; Karnataka), Myanmar, Nepal, Pakistan, Laos, Vietnam, Thailand and Bangladesh ( Vazirani 1984; Vondel 1993, 2015) ( Figure1 ).

Material studied. SDS & HVG studied single specimen (male) from Bhugaon Lake, Pune; BJVV examined the type specimen and additional specimens from India ( Vondel 1993).

Distinguishing characters from H. arrowi : Head overall brown, dorsally eyes closer than that in H. arrowi - distance between eyes 0.7 times width of one eye; pronotum darker on disc than on sides ( Figure 5 A); elytral maculation extensive against moderately dense to rare maculation in H. arrowi ( Figure 4 B), twenty rows of primary and secondary punctures present per elytron, 30 punctures in first primary-puncture row; ventrally brown, prosternum posteriorly with deeper pit than that in H. arrowi ( Figure 5 B), metaventrite with two deeper and less connected pits anterolaterally ( Figure 5 D); protarsi narrower and slender ( Figure 5 E); median lobe of male genitalia narrower and less spatulate in apical region ( Figure 5 C).

1. Pronotal base protruding ( Figure 5 A), 1st row of secondary punctures on elytra dense and sometimes irregular at base, distance between eyes is 0.7 times width of one eye, prosternal process anteriorly as wide as posteriorly, anterolateral metasternal pits deeper and more separated ( Figure 5 D)........................................................ H. angustifrons

- Pronotal base not protruding ( Figure 3 C), 1st row of secondary punctures on elytra sparse at base, between eyes distance is 1.1 times width of one eye, prosternal process wider posteriorly than anteriorly, anterolateral metasternal pits shallow and less separated ( Figure 2 D).............................................................................. H. arrowi

Figures

FIGURE 1. Distribution map for H. arrowi and H. angustifrons with previous and latest localities from the Oriental region. Red dots and blue squares—recent and previous records of H. arrowi from the Oriental region, respectively. Yellow trianglesknown records of H. angustifrons from the Oriental region.

FIGURE 3. A—Dighi pond, Pune; B—Savitribai Phule Pune University pond, Pune; H. arrowi, C—dorsal & ventral view (length 3 mm); D—Hind leg (scale 500 µm); E—Abdomen ventral (scale 100 µm); F—median lobe (scale 100 µm); G & Hright & left parameres, respectively (scale 100 µm).

FIGURE 5. H. angustifrons, A & B—Dorsal & ventral habitus; C—male genitalia (scale 100 µm); D—SEM of anterolateral metasternal pits; E—SEM of male protarsi.

FIGURE 2. H. arrowi (all SEM images), A—Head; B—Pronotum; C—Elytra; D—Elytral epipleura & anterolateral metasternal region; E—pro and metasternal region; F—metacoxal plates; G – magnified view of a setiferous puncture; H— Adhesive structures on male protarsomeres.