Corynexochida

Parablackwelderia spectabilis

Order Corynexochida / Suborder Leiostegiina / Superfamily Dameselloidea / Family Damesellidae / Subfamily Damesellinae

Guzhangian (Miaolingian, Cambrian)Liaoning, Shandong

Parablackwelderia spectabilis — photo 1 — Photo 1 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Parablackwelderia spectabilis — photo 2 — Photo 2 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Parablackwelderia spectabilis — photo 3 — Photo 3 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Parablackwelderia spectabilis — photo 4 — Photo 4 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Parablackwelderia spectabilis — photo 5 — Photo 5 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Parablackwelderia spectabilis — photo 6 — Photo 6 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Parablackwelderia spectabilis — photo 7 — Photo 7 · Restoration (Peng et al., 2008) Type specimen (Liaoning; left, colour photograph: SNMNH; right: Peng 2020) Cephalon and pygidium Type specimen in matrix (Liaoning; specimen (Shandong; Yadong) SNMNH)

Classification

Order Corynexochida / Suborder Leiostegiina / Superfamily Dameselloidea / Family Damesellidae / Subfamily Damesellinae

Genus

Parablackwelderia Kobayashi, 1942

Genus author

Kobayashi T.

Genus etymology

para, Greek, near, beside, similar to; Blackwelderia, a trilobite genus name

Species

P. spectabilis (Resser & Endo, 1937)

Species author

Resser C. E. & Endo R.

Species etymology

spectabilis, conspicuous, spectacular

Age

Guzhangian (Miaolingian, Cambrian)

Distribution

Liaoning, Shandong

Synonyms

Blackwelderia spectabilis; Blackwelderia quadrata

Diagnosis

Cranidium trapezoidal; glabella sub-broadly conical with rounded front and 3 pairs of shallow glabellar furrows; palpebral lobes supported by stout eye stalks; fixigenae wide. Pygidial axis narrow-conical, with 6 axial rings plus a terminal piece; pleural furrows distinct, interpleural furrows faint; 7 pairs of marginal spines, pairs 1 and 6 long and strong, pairs 2-5 slightly lengthening, pair 7 similar in length and shape to pairs 2-5. comparable.

Remarks

This species is the type species of the genus Parablackwelderia. Parablackwelderia is the earliest trilobite with stalked eyes.