Tanidromites wysokaensis, Starzyk, 2016

Starzyk, N, 2016, Three new species of the genus Tanidromites (Decapoda: Brachyura: Tanidromitidae) from the Late Jurassic (Oxfordian) of Poland, Palaeontologia Electronica 19 (3), pp. 1-14 : 7-9

publication ID	https://doi.org/ 10.26879/619
publication LSID	lsid:zoobank.org:pub:EAA411C7-C206-42F0-9262-C8CDA2BB46EC
persistent identifier	https://treatment.plazi.org/id/03FE87FF-4E3A-576C-C114-FA18FA6AFA23
treatment provided by	Felipe
scientific name	Tanidromites wysokaensis
status	sp. nov.

Treatment

Tanidromites wysokaensis View in CoL n. sp.

Figures 2 View FIGURE 2 , 4 View FIGURE 4

zoobank.org/ 42DE45DC-6D69-4447-9B02-E268EAA313EB

Diagnosis. Species reaching relatively large size – maximum carapace length 20.34 mm. Carapace is widest across epibranchial region. AtC distance is very long (0.33-0.42 of RtC distance). Rostrum is short (R/RtC≤0.3), downturned, with a blunt tip. Augenrest is flat, rounded and bordered; its length is half of width. Outer orbital spine is absent. Cervical pits are crescent-shaped. Hepatic pits and hepatic tubercles are absent.

Comparison. The species is most similar to Tanidromites scheffnerae and T. insignis; which are also large sized species. Maximum carapace length of T. wysokaensis n. sp. is 20.34 mm, while the length of the biggest specimen of T. scheffnerae is 27.34 mm and of T. insignis – 22.5 mm. The rostrum of T. wysokaensis n. sp. is not sharply ended as in T. scheffnerae and T. etalloni but more similar to T. insignis. Tanidromites scheffnerae and T. insignis have hepatic tubercles and hepatic pits (only T. insignis) which are absent in T. wysokaensis n. sp., as in T. etalloni. The shape of the augenrest is similar only to T. scheffnerae .

Etymology. The trivial name refers to one of the localities where this species was found – Wysoka (gender feminine, in Genitivum).

Material

Type material. Holotype: I-F / MP/ 6240 /1588/11; type locality: Ogrodzieniec; age: Early-Middle Oxfordian. Coll.: I.K. R. Borek.

Paratypes. I-F / MP/ 6260 /1588/11; locality: Ogrodzieniec; I-F / MP/ 6263 /1588/11; locality: Niegowonice; age: Middle-Late Oxfordian. Coll.: I.K. R. Borek.

Additional material. Specimens from Bzów: I-F / MP / 1896 /1517/08. From Niegowonice: I-F / MP / 1078 /1508/08; I-F / MP / 4507 /1534/08; I-F / MP / 4962 / 1543/09. Coll.: I.K. R. Borek.

Total number of specimens. 18.

Full list of the specimens and localities is presented in the Appendix.

Dimensions. The width across the epibranchial region ranges between 5.95 and 12.95 mm. The maximum carapace length 20.34 mm.

Description. The carapace is about 1.7x as long as wide, slightly convex ( Figure 4.1-3, 4.5 View FIGURE 4 ), with parallel borders. Lateral borders are smooth without the outer orbital spine. The AtC distance is very long (0.33-0.42 of the RtC) ( Figures 2 View FIGURE 2 , 4.1-3 View FIGURE 4 ).

The rostrum is short (R/RtC≤0.3), downturned, with blunt tip. The axial groove reaches the anterior end of the rostrum ( Figure 4.2, 4.8 View FIGURE 4 ).

The augenrest is flat, rounded, and very short; its length is 0.5x the width ( Figure 2 View FIGURE 2 ), bordered. The outer orbital spine is absent. Upper and suborbital margins are smooth ( Figure 4.6, 4.7 View FIGURE 4 ).

The mesogastric region is distinctly borderd by grooves in the anterior and posterior part, weaker in the middle. Anterior (narrow) and posterior (wide) part of the mesogastric region are more or less the same length; there is an incision in the posterior margin. Cervical pits are crescent-shaped ( Figure 2 View FIGURE 2 ). Mesogastric scars are elongated, strongly developed, positioned on both sides of the posterior incision, and extend across the entire posterior border of the mesogastric region. Proximally they are accompanied by a parallel pair of smaller scars. Protogastric and hepatic regions are not differentiated. Hepatic pits and hepatic tubercles are absent.

Epigastric regions are elongated. There is a small tubercle on the urogastric region.

There are two tubercles lying on the anterior part of the cardiac region. The posterior tubercle is absent.

The epibranchial region is strongly convex, branchial region more flattened. The epibranchial region is much shorter than branchial and hepatic regions.

The cervical groove is deep. The branchio-cardiac groove is deep on the lateral sides (parallel to the cervical groove), the middle part is very weakly visible. The posterior border of the carapace is broad and strongly concave in the middle part. It is rimmed.

There is no ornamentation on the carapace. Internal mold and the cuticle are smooth. A cuticle is preserved on the hepatic tubercles of the paratype (#6263, Figure 4.4 View FIGURE 4 ) and on one hepatic tubercle of the holotype (#6240, Figure 4.8 View FIGURE 4 ). They are distinct in both cases, with and without the cuticle.