Monodechenella Stumm 1953

Vanderlaan, Tegan A. & Ebach, Malte C., 2015, A review of the Carboniferous and Permian trilobites of Australia, Zootaxa 3926 (1), pp. 1-56 : 18-19

Genus Monodechenella Stumm 1953

1953 Dechenella (Monodechenella) Stumm ; p. 123. 1963 Conophillipsia Roberts; p. 25.

1967 Conophillipsia; Hahn & Hahn, p. 327. 1970 Conophillipsia; Osmólska, p.13–25.

1972 Conophillipsia; Hahn & Hahn, p. 382. 1978 Conophillipsia; Kobayashi & Tachibana, p. 262. 1984 Conophillipsia; Engel & Morris, p. 23–64. 1990 Conophillipsia; Schraut, p. 36.

1993 Conophillipsia; Hahn & Hahn, p. 16–21, tab. 2–3. 1994 Monodechenella ; Lieberman; p. 137–138. 1994 Conophillipsia; Owens, p. 214–216.

1996 Conophillipsia; Schraut, p. 21.

2006 Monodechenella ; Owens, p. 119–143.

Type species. Monodechenella macrocephala ( Hall 1861) .

Diagnosis. See Lieberman (1994: 137).

Remarks. The genus Conophillipsia Roberts 1963 is herein considered a junior synonym of Monodechenella Stumm 1953 , following the arguments presented by Lieberman (1994) and Owens (1994, 2006). Conophillipsia was described as a new genus based on its age, only being found in the Carboniferous ( Hahn & Hahn 1993; Hahn & Brauckmann 1993; Engel & Morris 1997). However, the striking similarities to Monodechenella species convincingly places Conophillipsia species within the generic concept of Monodechenella . These features include a broad, flat proetid-like cephalon, with a multisegmented phillipsiid-like pygidium ( Lieberman 1994; Owens 1994). Owens (1994) has discussed the possibility of pseudo-extinctions in proetid trilobites from the late Devonian, which circumvents the biostratigraphic arguments for a new genus.

Species included. Monodechenella antonovi ( Weber 1937) , Monodechenella aryssica ( Weber 1937) , Monodechenella ataica ( Weber 1937) , Monodechenella bleibergensis ( Schraut 1996) , Monodechenella boteroi (Caster & Richter in Richter & Richter 1950), Monodechenella breviceps ( Mitchell 1918) , Monodechenella curvimarginata ( Hall & Clarke 1888) , Monodechenella decisegmenta ( Kobayashi & Tachibana 1978) , Monodechenella grandis (Etheridge Jr. 1892b), Monodechenella halli ( Stumm 1953) , Monodechenella kazakensis ( Weber 1937) , Monodechenella koizumii ( Kaneko 1983) , Monodechenella legrandsmithi Lieberman 1994 , Monodechenella longa ( Weber 1937) , Monodechenella macrocephala ( Hall 1861) , Monodechenella magna ( Hahn & Hahn 1972) , Monodechenella meisteri ( Weber 1937) , Monodechenella morganensis ( Mitchell 1918) , Monodechenella multicostata ( Weber 1937) , Monodechenella paucicostata ( Weber 1937) , Monodechenella sichuanensis ( Lee 1978) , Monodechenella sonculica ( Weber 1937) , Monodechenella speciosa ( Engel & Morris 1984) , Monodechenella subquadrata ( Engel & Morris 1984) , Monodechenella subtriangularis ( Engel & Morris 1984) .

Age and distribution. Mid Devonian to Late Viséan in Australia, Austria, Japan and Russia ( Engel & Morris 1984; Owens 1994; Schraut 1996).