Bucculentum plettenbergense, Krzemińska & Starzyk & Fraaije & Schweigert & Lukeneder, 2021

Krzemińska, Ewa, Starzyk, Natalia, Fraaije, René H. B., Schweigert, Günter & Lukeneder, Alexander, 2021, Jurassic brachyurans of the genus Bucculentum, Zootaxa 5032 (3), pp. 395-410 : 402-403

publication ID

https://doi.org/ 10.11646/zootaxa.5032.3.5

publication LSID

lsid:zoobank.org:pub:321FAB6F-EEF4-4273-A2EA-C5EDFD08611F

DOI

https://doi.org/10.5281/zenodo.5498925

persistent identifier

https://treatment.plazi.org/id/F46087FB-9452-4C46-908A-3228FED5F84A

treatment provided by

Plazi

scientific name

Bucculentum plettenbergense
status

sp. nov.

Bucculentum plettenbergense View in CoL , n. sp.

Fig. 1G View FIGURE 1 , 7 View FIGURE 7

Diagnosis. Metabranchial region large, more than half as long as carapace, and a little wider than hepatic region; augenrest round, slightly concave, shifted more dorsally than in other species of genus, and flanked laterally by long, crescent ridge; suborbital spine undivided, curved upwards; epibranchial region very narrow.

Etymology. The new species is named after its type locality.

Material examined. Holotype MAB 3576, Germany: Plettenberg quarry n. Balingen (N 48 o 21’, E 8 o 80’), coll. RHB Fraaije, Late Oxfordian: Planula Zone ( Schweigert & Callomon 1997; Jantschke & Schweigert 2020).

Description. The carapace is 8.43 mm long. The rostrum and centro-anterior portion have been split off. Left augenrest complete, large, round, shifted to dorsal side at an angle c. 50 o to the surface of carapace and delimited laterally by a narrow, crescent-like ridge. The suborbital spine is directed upwards ( Fig. 7A, B View FIGURE 7 , arrows). The epibranchial region is very narrow (less than 10% of the total lateral length of carapace), with two symmetric swellings over the cardiac region. The cardiac region has three tubercles arranged axially, the distalmost one being the largest, and also the highest point of the carapace. The metabranchial region is characteristically large, a little bit wider than the hepatic region, and more than half as long as the carapace.

Remarks. Bucculentum plettenbergense , n. sp., is distinguished because of having the largest metabranchial region amongst all bucculentids, combined with the narrowest epibranchial region. Such proportions are not met in any other congener.

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