Diogenicheles theodorae, Fraaije & Krzemiński & Van Bakel & Krzemińska & Jagt, 2014
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publication ID |
https://doi.org/ 10.4202/app.2012.0022 |
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persistent identifier |
https://treatment.plazi.org/id/03C29868-902A-FFCA-FF26-3A42FD391478 |
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treatment provided by |
Felipe |
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scientific name |
Diogenicheles theodorae |
| status |
sp. nov. |
Diogenicheles theodorae sp. nov.
Figs. 2A View Fig , 3A View Fig .
Etymology: Named after Theodora van Boom, wife of the senior author, in acknowledgement of her patience and companionship during research of fossil paguroids.
Holotype: I−F/ MP/3957 /1533/08 ( ISEA), a near−complete shield (maximum length 3.0 mm, maximum width 2.5 mm).
Type locality: Abandoned quarry at Bzów, a prolongation of the huge quarry at Ogrodzieniec, southern Poland.
Type horizon: Ammonites [ Ochetoceras canaliculatum (von Buch, 1831) , Trimarginites trimarginatus (Oppel, 1863) , Dichotomosphinctes sp. and Glochioceras subclausum (Oppel, 1863)] collected at this locality have recently been identified by Günter Schweigert (personal communication 2011). They indicate the Gregoriceras transversarium Zone of the middle Oxfordian.A single specimen in this lot might represent Cardioceras tenuiserratum Oppel, 1863 , which would indicate the upper Perisphinctes plicatilis Zone (see also Matyja and Wierzbowski 1994).
Diagnosis.—As for the genus, by monotypy.
Description.—Well−calcified and areolated shield, length slightly exceeding width, subcylindrical transversely, slightly convex longitudinally. Relatively broad post−rostral area centrally covered by a ridge forming the base of the rostrum and posteriorly passing into shallow central gastric groove. Broad crescentic post−rostral ridge. Gastric region bounded laterally by massetic grooves, posteriorly by deep wavy U−shaped cervical groove; anterior part delimited by and covered by faint transverse crenulations. Mesogastric process absent. Elongated and undivided massetic region forming widest part of shield. Posterior part of wavy U−shaped cervical groove pronounced and very deep, anterolaterally curving around reniform keraial region area. Distinct, elongated anterior branchial area present lateral to keraial region and posterior of massetic region. Cardiac region not preserved.
Remarks.— Diogenicheles theodorae gen. et sp. nov. reveals certain similarities to the mid−Cretaceous (Albian–Cenomanian) diogenid Annuntidiogenes worfi Fraaije, Van Bakel, Jagt, Klompmaker, and Artal, 2009 (see also Fraaije et al. 2012a). Both forms have an elongated shield that becomes narrower posteriorly, anterior gastric crenulations, and an undivided, elongated and smooth massetic region. The typical distinct threefold junction of keraial, massetic and anterior branchial areas is observed only in the Parapylochelidae and therefore we assign Diogenicheles theodorae to this family. It is distinguished from all other known parapylochelids by its elongated and undivided massetic region. The broad postfrontal ridge and the morphology of the gastric and keraial regions suggest a close relationship with Pilgrimcheles karolinae sp. nov. Unfortunately, the rostrum and frontal details are not preserved in the sole specimen known to date.
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