Haplomyces texanus Thaxt.

MB#232578

Fig. 79

Proceedings of the American Academy of Arts and Sciences 28: 160 (Thaxter 1893). –

Type: “ On abdomen and elytra of Bledius rubiginosus Er., Texas ”; FH. [USA]

Diagnostic features

Cell II slightly flattened, pale to variably blackened towards the base and dorsal side. Cell III variable in shape and pigmentation. The spinous process on the antheridium may vary from a blunt inconspicuous prominence to a rather elongated, sharp, spinous process. Trichogyne stump conspicuous as a flat disk between w 2 and w 3 tiers (Fig. 79H, ts). [Detailed descriptions: Thaxter 1896; Majewski 1994b; Santamaria 2003]

Distribution and hosts

On several species of Bledius (Col. Staphylinidae Oxytelinae) from USA (type), United Kingdom, France, the Netherlands, Italy, Finland, Russia, Poland, Spain, Latvia, China (Majewski 2008), Sweden (Huggert 2010), Turkey (Rossi 2016), and Czech Republic (Rossi et al. 2019b).

Collections examined from Denmark

On Bledius diota Schiødte, 1866 (Col. Staphylinidae Oxytelinae) DENMARK – Nordøstsjaelland (NEZ) • Amager Faelled; 55°39.168′ N, 12°34.750′ E; UB47; 12 Jul. 1849; Schiødte Dry0129; Schiødte det.; ZMUC C-F-124196 . – Sydjylland (SJ) • Sønderstrand på Rømø; 55°6.373′ N, 8°29.380′ E; MG60; 14 Mar. 2020; JP 1620; JP det.; ZMUC C-F-124365 . – Vestjylland (WJ) • Esbjerg; 55°29.375′ N, 8°26.363′ E; MG64; 15 Jul. 1924; V. Hansen Dry0130; V. Hansen det.; ZMUC C-F-124197 • Skallingen; 55°31.076′ N, 8°14.838′ E; MG55; 21 Sep. 1951; E. Bro Larsen Dry0128; E. Bro Larsen det.; ZMUC C-F-124195 • ibid.; 11 Jun. 1960; H. Gønget Dry0127; H. Gønget det.; ZMUC C-F-124194 .

On Bledius dissimilis Erichson, 1840 (Col. Staphylinidae Oxytelinae) DENMARK – Sydjylland (SJ) • Kelstrup Strand; 55°11.503′ N, 9°35.000′ E; NG31; 22 Jul. 1930; Høeg Dry0125; Høeg; ZMUC C-F-124192 .

On Bledius femoralis (Gyllenhal, 1827) (Col. Staphylinidae Oxytelinae) DENMARK – Nordvestjylland (NWJ) • Hanstholm Vildtreservat; 57°4.208′ N, 8°34.593′ E; MJ72; 8° Jun. 1955; U. Kornerup Dry0132; U. Kornerup det.; ZMUC C-F-124199 • Nors; 57°1.232′ N, 8°40.706′ E; MJ81; 20 Aug. 1955; V. Hansen Dry0131; V. Hansen det.; ZMUC C-F-124198 .

On Bledius furcatus (Olivier, 1811) (Col. Staphylinidae Oxytelinae) DENMARK – Nordøstjylland (NEJ) • Kringelrøn; 57°13.308′ N, 11°0.233′ E; PJ24; 25 May 1993; M. Hansen Dry0134; M. Hansen det.; ZMUC C-F-124201 .

On Bledius gallicus (Gravenhorst, 1806) (Col. Staphylinidae Oxytelinae) DENMARK – Nordøstjylland (NEJ) • Skagen; 57°44.644′ N, 10°36.077′ E; NK90; Jul. 1849; Schiødte Dry0135; Schiødte det.; ZMUC C-F-124202 .

On Bledius longulus Erichson, 1839 (Col. Staphylinidae Oxytelinae) DENMARK – Lolland, Falster, Møn (LFM) • Slotsgavlene, Møns Klint; 54°59.586′ N, 12°32.065′ E; UA49; 9 Jul. 1894; F. de Tengnagel Dry0137; F. de Tengnagel det.; ZMUC C-F-124204 . – Vestjylland (WJ) • Skallingen; 55°31.076′ N, 8°14.838′ E; MG55; 30 Apr. 1935; E. Bro Larsen DrY0136; E. Bro Larsen det.; ZMUC C-F-124203 .

On Bledius occidentalis Bondroit, 1907 (Col. Staphylinidae Oxytelinae) DENMARK – Vestjylland (WJ) • Esbjerg; 55°29.375′ N, 8°26.363′ E; MG64; 1901; J.P. Johansen Dry0142; J.P. Johansen det.; ZMUC C-F-124210 .

On Bledius opacus (Block, 1799) (Col. Staphylinidae Oxytelinae) DENMARK – Nordøstjylland (NEJ) • Fredrikshavn; 57°26.910′ N, 10°32.102′ E; NJ96; Jul.1849; Schiødte Dry0143; Schiødte det.; ZMUC C-F-124211 . – Nordøstsjaelland (NEZ) • Tisvilde Hegn; N 56 ° 3.629′ N, 12 ° 5.777′ E, UC11; 21 Jul. 1890; F. de Tengnagel Dry0144; F. de Tengnagel det.; ZMUC C-F-124212 .

On Bledius pallipes (Gravenhorst, 1806) (Col. Staphylinidae Oxytelinae) DENMARK – estjylland (WJ) • Endrupholm; 55°31.202′ N, 8°43.026′ E; MG85; 28 Aug. 1932; Johs. Andersen DrY0126; Johs. Andersen det.; ZMUC C-F-124193 .

On Bledius tricornis (Herbst, 1784) (Col. Staphylinidae Oxytelinae) DENMARK – Nordøstsjaelland (NEZ) • Amager Øststrand; 55°39.258′ N, 12°38.283′ E; UB57; 30 Jul. 1860; Schiødte Dry0138; Schiødte det.; ZMUC C-F-124205 • Vesterfaelled; 55°40.198′ N, 12°32.371′ E; UB47; 24 Nov. 1895; Rosenberg Dry0140; Rosenberg det.; ZMUC C-F-124207 . – Vestjylland (WJ) • Esbjerg; 55°29.375′ N, 8°26.363′ E; MG64; 25 Jun. 1897; Dry0139; ZMUC C-F-124206 .

Remarks

First record from Denmark. The genus Haplomyces requires a thorough revision. The three described species were separated on the basis of subtle characters. Moreover, H. texanus alone is so variable that perhaps it should be considered as a collective species and includes some undescribed species. We had the opportunity to study many Danish samples from several species of Bledius . Not only are there differences between thalli from distinct hosts but also among those living on the same individual host. As written by Majewski (1994b): “possibly more than one taxon of Haplomyces occurs in Europe”. The problem is to delimit the characteristics. This variability is illustrated in Fig. 79 and concerns almost any characteristic of the thallus. These variations were also described and illustrated by Santamaria (2003) for Iberian samples. Waiting the help of more accurate taxonomical techniques, we prefer to treat Haplomyces texanus as a single, very variable species.