Discomegistus Trägårdh 1911

Klompen, Hans & Gerdeman, Beverly S., 2023, Genus-level revision of the Heterozerconoidea (Parasitiformes: Mesostigmata), Zootaxa 5322 (1), pp. 1-66 : 20

Discomegistus Trägårdh 1911

Discomegistus Trägårdh 1911: 2

[type species: Discomegistus pectinatus Trägårdh 1911 , by monotypy].

Discomegistus .— Vitzthum 1925: 44; Domrow 1956: 194; Seeman & Baker 2013: 131.

( Figs 20 , 43 , 88 ).

Diagnosis: Sclerotized areas around sternal setae st 1 in female fused to each other (34); sclerotized areas near sternal setae st 2 in female fused to genitiventral shield (38); equally spaced long marginal setae present (76).

Material examined. One male with no data (FMNH).

Remarks: In the single available male specimen metasternal setae st4 appear absent (41; this designation is tentative, based on a single available specimen; it should be checked with additional material). Second, basitarsi II–IV show an added mid-dorsal sensillum ( Fig. 88 , red arrow) that has not been reported previously. This structure is not present in Discozercon , Berzercon , or in any other Heterozerconoidea examined. In fact, we are not aware of such a structure in any other Mesostigmata .

Figures

FIGURES 20–22. Left palp, adults: 20, Discozerconidae, Discomegistus sp., male (FMNH); 21; Heterozerconidae, Amyzozercon chocoensis, male (OSAL 106788); 22, Al. (Philippinozercon) makilingensis, male (OSAL 053267, redrawn from Gerdeman et al. (2018)).

FIGURES 43–44. Discozerconidae, idiosoma dorsal: 43, Discomegistus sp., male (FMNH); 44, Discozercon derricki. Inset: patterning dorsal cuticle.

FIGURES 87–92. Leg II, male, antero-dorsal view: 87, Discozerconidae, Discozercon derricki (OSAL 004889); 88, Discomegistus sp., male, basitarsus IV (FMNH; red arrow: mid-dorsal sensillum); 89, Heterozerconidae, Ecuazercon cushuimensis, (FMJK 71–1118); 90, Amheterozercon amphisbaenae (OSAL 052763); 91 Narceoheterozercon ohioensis, redrawn from Gerdeman & Klompen (2003); 92, Afroheterozercon mahsbergi (OSAL 003042, published).