Humerocryptus, Gimmel & Leschen, 2022

Gimmel, Matthew L. & Leschen, Richard A. B., 2022, Revision of the genera of Picrotini (Coleoptera: Cryptophagidae: Cryptophaginae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 62 (1), pp. 61-109 : 84-86

Humerocryptus gen. nov.

( Figs 27 , 28 , 79 , 88, 89 , 101 )

Type species. Cryptophagus tumidus Broun, 1893 , by present designation.

Diagnosis. This New Zealand genus is easily distinguished by the presence of a boss on the head ( Fig. 89 ) and a spine on the humeral area of the elytron ( Fig. 79 ), at the terminus of the superior elytral epipleural carina. In addition, they have an antennal club comprised of three antennomeres, pronotal platforms ( Fig. 88 ), and all abdominal ventrites free.

Description. Length 1.60–1.85 mm. Body form ( Figs 27–28 ) moderately shortened, shining dorsally, with dense decumbent setae dorsally; distinctly bicolored. Head with tempora prominent, length from about 1/5 to 1/3 length of eye; vertex with broad temporal depression immediately anterior to ridge; band of reticulate sculpture present. Frontoclypeus not projecting laterally; raised portion of frons between antennal insertions not constricted, wider than antennal club; frons between and anterior to eyes transversely elevated, forming a boss ( Fig. 89 ). Transverse ridge above antennal insertions absent. Eye large, rounded, contacting antennal cavity; interfacetal setae absent. Antennal club consisting of 3 antennomeres; antenna inserted into relatively large cavity; antennomere 9 subequal in width to antennomere 10. Mandible with apex bifid, subapical serrations present. Maxillary palpomere 4 distinctly longer than or subequal to 3; palpomere 4 not subulate. Gena without antennal groove; genal spines acute ( Figs 88–89 ). Gular sutures incomplete, not reaching occipital foramen. Pronotum not explanate, narrower than elytra and not constricted at base, widest anteriorly; anterior angles absent, not projecting anteriorly (not extending anterior to cervical foramen of prothorax), with tumidity and with an indistinct flat glandular surface or platform ( Figs 88, 89 ); lateral carina lacking teeth, crenulations, or setigerous tubercles, obliterated in apical third ( Figs 88–89 ), with lateral glabrous space narrow, width of lateral bead wider than discal puncture and narrower than antennal funicle; disc with transverse basal impression present ( Figs 88, 89 ); paramedial carinae and paralateral plicae absent; posterolateral angles about right. Prothoracic hypomeron fused to prosternum, notosternal suture faintly indicated, with distinct impression along basal half of suture ( Fig. 88 ). Prosternum with anterior margin on different plane than disc ( Fig. 88 ) with outline gently or weakly descending anteriorly; prosternal process with lateral beads weakly indicated, but with pair of weak, slightly convergent carinae near apex flanking a longitudinal groove, process slightly expanded apically, truncate apically and crenulate with minute setae; procoxal cavity with anterolateral notch. Scutellar shield clearly visible and transverse. Elytron with humeral tooth ( Fig. 79 ); subbasal impression present, subapical impression present but weakly indicated; subapical gape present; punctation confused, not dense and moderately to shallowly impressed; vestiture uniform, decumbent setae forming undulate pattern, with postscutellar and subapical setae usually directed laterally. Hind wing well developed. Mesoventrite with mesoventrital cavity shallow and flanked by sharp carinae. Mesanepisternal pit present and glabrous. Metaventrite without postcoxal lines; discrimen more than 1/2 length of metaventrite, posterior notch of metaventrite present. Metendosternite with anterior tendons approximate. Tarsi 5-5- 5 in female, 5-5- 4 in male; tarsi slender, tarsomere 5 as wide as preceding tarsomeres in lateral view; pro- and mesotarsomere 4 lacking setae; mesotarsomere 3 weakly lobed and setose; mesotarsomere 1 about 1/3 the length of 2, mesotarsomeres 2–4 of equal lengths, mesotarsomere 5 about as long as mesotarsomeres 1–4 combined. Abdominal ventrites free and with medial calli, lateral calli absent, intersegmental crenulations absent; ventrite 1 with intercoxal process broadly rounded, lacking postcoxal lines; medio-basal thickenings of ventrites 3–5 absent; apex of ventrite 5 lacking crenulations.Abdominal spiracles with opening on segment VII present and larger in diameter than spiracle VI, annulate, and atrium rounded and saclike. Aedeagus ( Fig. 101 ) without tegminal strut and arms fused without a suture, or tegminal arms separate and apically acute and joined by a membrane; parameres fused together and to phallobase, their combined length about 1/2 as long as wide; apices bisetose and lacking macrosetae; attachment point to phallobase not constricted, interparameral process absent; basipenis 3.0–5.0× longer than distipenis, without median carina, or a barely indicated at midline; distipenis relatively short about as long as wide, outer rims tuberculate, lateral lobes widely separated, symmetrical; internal sac with two short slender endophallites that diverge and curve outward anteriorly.

Etymology. The generic name is derived from a combination of the Latin “ humerus ”, meaning shoulder, in reference to the elytral humeral spine, and “ -cryptus ”, a common generic ending in Cryptophagidae . The gender is masculine.

Biology. Humerocryptus tumidus has been collected by sifting leaf litter and a new species from Westland has been collected from flood debris and under bark.

Distribution. New Zealand.

Included species (1+1). Humerocryptus tumidus ( Broun, 1893) comb. nov. (from Micrambina ); one undescribed species.

Figures

Figs 19–27. Habitus of species of Picrotini. 19 – Connatocryptus utiku sp. nov.; 20 – Cordosomatula magnabagishae sp. nov.; 21 – Cryptosomatula longicornis Bruce, 1940; 22 – Cryptothelypterus atomarioides (Grouvelle, 1919); 23 – Cryptothelypterus obrieni Leschen & Lawrence, 1991; 24 – Cryptothelypterus pteropilosus Leschen & Lawrence, 1991; 25 – Cryptothelypterus splendens (Bruce, 1940); 26 – Foveocryptus chenyandongi sp. nov.; 27 – Humerocryptus tumidus (Broun, 1893). Scale bars = 1 mm.

Figs 28–36. Habitus of species of Picrotini. 28 – Humerocryptus n. sp. 1 (New Zealand); 29 – Neopicrotus peckorum Leschen, 1996; 30 – Neopicrotus n. sp. 1 (Chile); 31 – Neopicrotus n. sp. 2 (Australia); 32 – Neopicrotus n. sp. 3 (Australia); 33 – Notocryptus australis (Redtenbacher, 1868); 34 – Notocryptus discoideus (Broun, 1893); 35 – Notocryptus distinctus (Broun, 1893); 36 – Notocryptus lindensis (Blackburn, 1891). Scale bars = 1 mm.

Figs 77–81. Characters of Picrotini. 77–78 – detail of pronotum. 77 – Chimaerocryptus johnsoni sp. nov.; 78 – Odonotosomatula carltoni sp. nov. 79 – pronotum and base of elytra, Humerocryptus n. sp. 1. 80 – antennal club, Paragnetaria slipinskii sp. nov. 81 – eye, Cryptothelypterus pteropilosus Leschen & Lawrence, 1991. Abbreviations: pp = paralateral plica.

Figs 82–89. Head and pronotum of Picrotini. 82–88 – lateral view. 82 – Antarcticotectus rutilus (Broun, 1880); 83 – Antarcticotectus silvanus (Broun, 1880); 84 – Antarcticotectus tasmanicus (Blackburn, 1907); 85 – Chiliotis sp.; 86 – Notocryptus australis (Redtenbacher, 1868); 87 – Ostreacryptus helmsi (Reitter, 1880); 88 – Humerocryptus n. sp. 1. 89 – dorsolateral view, Humerocryptus tumidus (Broun, 1893).Abbreviations: lgs = lateral glabrous space.

Figs 98–103.Aedeagus, dorsal view. 98 – Austroscelis gibbipennis (Blackburn, 1892); 99 – Bellascelis pecki sp. nov.; 100 – Cordosomatula magnabagishae sp. nov.; 101 – Humerocryptus n. sp. 1; 102 – Notocryptus australis (Redtenbacher, 1868); 103 – Orthoscelis transversus sp. nov. Abbreviations: aet = anterior extension of tegmen; as = apical serrations; bk = basal kink of internal sac; ep = endophallites; ics = inner concave surface; ip = interparameral plate; lf = lateral fold; os = ostium; pg = primary gonopore.