Muellerizomus, DE FRANCESCO MAGNUSSEN &, 2022

Magnussen, Ilian De Francesco, Müller, Sandro P., Hammel, Jörg U., Kotthoff, Ulrich & Harms, Danilo, 2022, Diversity of schizomids (Arachnida: Schizomida) revealed by new fossil genera and species from mid-Cretaceous Burmese amber with implications for a Gondwanan origin of the Burma Terrane, Zoological Journal of the Linnean Society 196, pp. 792-844 : 824

† MUELLERIZOMUS DE FRANCESCO MAGNUSSEN &

S.P. MÜLLER GEN. NOV.

( FIGS 27–34 )

Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. o r g: act: 1E280AB6-17C2-4F05-A4C4-E021DF9F2722

Type species: † Muellerizomus palicaudatus De Francesco Magnussen sp. nov.

Remarks

Specimens of this genus show asymmetrical tarsal spurs and also differ from species of Protoschizomidae by the lack of a pair of setae at the base of the anterior process and the presence of a distinct stalk at the male flagellum. They also differ from members of Megaschizominae by having a smaller body size, lack of eight or nine setae on their anterior process and the presence of only one pair of setae on the tergites II -VII. Therefore, they are clearly members of subfamily Hubbardiinae . The specimens cannot be assigned to any extant genus because of their combination of characters.

Diagnosis

† Muellerizomus differs from all other hubbardiid genera by the following combination of characters: propeltidium with a single median seta followed by three pairs of setae; eye spots present or absent; metapeltidium not divided; body without clavate setae; pedipalp trochanter with a mesal spur (equivocal in † Mu. amandae ); anterodorsal margin of femur of leg IV produced at an angle of ~90°; tergite II with one pair of setae; tergites X–XII not elongated; tergite XII with posterodorsal process; male flagellum dorsoventrally flattened; female flagellum with three annuli.

Etymology

The genus name is a patronym for private collector Patrick Müller, who provided the specimen and numerous others for examination, with the common suffix -zomus, from the last letters of Schizomus . It is masculine in gender.

Comparison

† M u e l l e r i z o m u s s h a r e s c h a r a c t e r s w i t h † Groehnizomus , but the latter has corneate eyes and a divided metapeltidium (eye spots and metapeltidium not divided in † Muellerizomus ). Secozomus Harvey, 2001b from the Seychelles is also similar, but it lacks a posterodorsal process, and the anterodorsal margin of femur IV is angled at> 90°. For comparison with Recent genera, see the Supporting Information ( Table S1).

Figures

Figure 27. Specimen GPIH04895, †Muellerizomus amandae, sp. nov., holotype. A, specimen in dorsal view, photograph. B, same, interpretative drawing. C, specimen in ventral view, photograph. D, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 1 mm.

Figure 28. Specimen GPIH04895, †Muellerizomus amandae, sp. nov., holotype details. A, male flagellum in dorsal view, photograph. B, same, interpretative drawing. C, male flagellum in ventral view, photograph. D, same. interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 0.25 mm.

Figure 29. Specimen GPIH04892, †Muellerizomus amandae sp. nov., female paratype. A, specimen in dorsal view, photograph. B, same, interpretative drawing. C, specimen in ventral view, photograph. D, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 1 mm.

Figure 30. Specimen GPIH04892, †Muellerizomus amandae sp. nov., female paratype, details. A, propeltidium in dorsal view, photograph. B, same, interpretative drawing. C, metapeltidium in dorsal view, photograph. D, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 0.5 mm (A, B); 0.25 mm (C, D).

Figure 31. Specimen GPIH04892, †Muellerizomus amandae sp. nov., female paratype, details. A, female flagellum in dorsal view, photograph. B, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bar: 0.50 mm.

Figure 32. Specimen GPIH04894, †Muellerizomus palicaudatus sp. nov., holotype. A, specimen in dorsal view, photograph. B, same, interpretative drawing. C, specimen in ventral view, photograph. D, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 1 mm.

Figure 33. Specimen GPIH04894, †Muellerizomus palicaudatus sp. nov., holotype, details. A, prosoma in dorsal view, photograph. B, same, interpretative drawing. C, left pedipalp in ectal view, photograph. D, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 0.5 mm.

Figure 34. Specimen GPIH04894, †Muellerizomus palicaudatus sp. nov., holotype, details. A, flagellum in dorsal view, photograph. B, same, interpretative drawing. C, flagellum in ventral view, photograph. D, same, interpretative drawing. See Material and methods for explanation of abbreviations. Scale bars: 0.25 mm.